KR20170009371A - Method for preparing electrode material, electrode material prepared thereby, and battery including the electrode material - Google Patents

Abstract

The present invention relates to an amorphous transition metal phosphate based electrode active material and a method for producing the same. More particularly, the present invention relates to a nano-sized amorphous transition metal phosphate based electrode active material which facilitates mobility in an electrode active material of charge carriers having a large ion size An amorphous transition metal phosphate-based electrode active material produced by the method, and a secondary battery including the electrode active material.
According to the present invention, it is possible to produce nano-sized amorphous transition metal phosphate-based electrode active materials that are easy to migrate in an electrode active material of charge carriers having a large ion size. In addition, according to the present invention, it is possible to provide a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion secondary battery, and a zinc ion secondary battery to which an amorphous transition metal phosphate type electrode active material having a nanosize size that facilitates mobility in charge carriers of ion- The battery and the magnesium ion can provide a secondary battery.

Description

FIELD OF THE INVENTION The present invention relates to a method for producing an amorphous transition metal phosphate based electrode active material, an amorphous transition metal phosphate based electrode active material prepared by the method, and a secondary battery including the electrode active material. BACKGROUND ART MATERIAL}

The present invention relates to an amorphous transition metal phosphate based electrode active material and a method for producing the same. More particularly, the present invention relates to a nano-sized amorphous transition metal phosphate based electrode active material which facilitates mobility in an electrode active material of charge carriers having a large ion size An amorphous transition metal phosphate-based electrode active material produced by the method, and a secondary battery including the electrode active material.

Lithium secondary batteries, which have high energy density and long life characteristics, are mainly used as power storage devices for automobile power supplies and auxiliary power sources as well as portable electronic devices. As the active material constituting the positive electrode of such a lithium secondary battery, a transition metal composite oxide containing lithium is used, and as the active material of the negative electrode, a carbon-based material and a metal alloy are used.

The field to which the transition metal complex oxide including lithium is applied is increasingly being used as a medium to large-sized power storage device in small electronic apparatuses, and the reserves of lithium and expensive transition metals are being reduced. In addition to increasing the unit price, Due to the local limitations, the price of lithium secondary batteries is expected to increase. Accordingly, researches on secondary batteries using charge carriers (Na ⁺ , K ⁺ , Zn ²⁺ , Mg ²⁺ , Al ³⁺ ) inexpensive instead of lithium ions have recently been actively conducted.

In addition, because of the large amount of power stored in a small volume of power storage system, a solution to the problem of stability has become the focus of research. From this viewpoint, lithium-transition metal phosphates (LiMPO ₄ , Li ₃ M ₂ (PO ₄ ) ₃ ) containing phosphates are more structurally and thermally stable than layered lithium-cobalt oxides,

However, in the case of charge carriers (Na ⁺ , K ⁺ , Zn ²⁺ , Mg ²⁺ , Al ³⁺ ) other than lithium, charge carriers are difficult to migrate in the phosphate based active material structure due to large ionic radius.

Therefore, charge carriers having a large ion radius in the electrode active material can move, and development of an electrode active material having high stability and high performance is required.

Open Patent No. 10-2014-0021843 (published Feb. 21, 2014)

The inventors of the present invention have made efforts to solve all the disadvantages and problems of the prior art as described above, and as a result, they have developed a technology capable of easily producing an electrode active material in an electrode active material of charge carriers having a large ion size, .

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for preparing a nano-sized amorphous transition metal phosphate-based electrode active material which facilitates mobility in charge transport materials having large ion sizes and a nanosized amorphous transition metal Phosphate-based electrode active material.

It is still another object of the present invention to provide a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion battery, and a lithium ion battery using the nanoparticulate amorphous transition metal phosphate type electrode active material which facilitates mobility in the electrode active material of charge carriers having a large ion size. The secondary battery and the magnesium ion provide the secondary battery.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a method for preparing a reaction solution, comprising: dissolving a transition metal precursor in distilled water and adding an organic solvent to prepare a reaction solution; maintaining the reaction solution in the reaction solution for a predetermined time; And a step of adding a solution in which phosphoric acid or a phosphate is dissolved to the reaction solution and allowing the reaction to occur for a predetermined time to precipitate a nano-sized amorphous synthetic material, wherein the amorphous transition metal phosphate- to provide.

In a preferred embodiment, the transition metal precursor is any one selected from the group consisting of transition metal acetate, transition metal acetylacetonate, and transition metal chloride.

In a preferred embodiment, the transition metal acetate salt is M (CH ₃ CO ₂ ) ₂ .H ₂ O (M is any one selected from the group consisting of Fe, Mn, Cu and Co).

In a preferred embodiment, the transition metal acetylacetonate is any one selected from the group consisting of iron acetylacetonate, manganese acetylacetonate, copper acetylacetonate, cobalt acetylacetonate, and vanadium acetylacetonate.

In a preferred embodiment, the transition metal chloride is MClx (M is any one selected from the group consisting of Fe, Mn, Cu and Co).

In a preferred embodiment, the organic solvent is any one selected from the group consisting of methanol, ethanol, propanol, butanol, and pentanol.

In a preferred embodiment, the ratio of the distilled water to the organic solvent is 1: 1.5 to 1:10.

In a preferred embodiment, the molar ratio of the transition metal precursor to the solution in which the phosphate or phosphate is dissolved is in the range of 1: 0.5 to 1: 2.

In a preferred embodiment, the step of precipitating the synthetic material is followed by filtering the precipitated synthetic material; And drying the filtered synthetic material.

In a preferred embodiment, the nano-sized amorphous synthetic material has a structure represented by the following formula (1).

≪ Formula 1 >

M _x (PO ₄ ) _y

Wherein M is any one selected from the group consisting of Fe, Mn, Cu and Co.

In order to achieve the above object, the present invention also provides an amorphous transition metal phosphate-based electrode active material produced by the above-mentioned method for producing an amorphous transition metal phosphate based electrode active material.

In a preferred embodiment, the amorphous transition metal phosphate-based electrode active material is a cathode electrode of a secondary battery selected from the group consisting of a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion secondary battery, and a magnesium ion secondary battery .

In order to accomplish the above object, the present invention also provides a cathode comprising the above-mentioned amorphous transition metal phosphate based active material; An anode made of lithium metal; Separation membrane; And an electrolytic solution prepared by dissolving LiPF ₆ in a molar concentration of 1: 1 in a mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC) in a ratio of 1: 1.

In order to accomplish the above object, the present invention also provides a cathode comprising the above-mentioned amorphous transition metal phosphate based active material; An anode made of sodium metal; Separation membrane; And an electrolytic solution prepared by dissolving a molar concentration of NaClO ₄ salt in a PC (Propylene Carbonate) solvent.

In order to accomplish the above object, the present invention also provides a cathode comprising the above-mentioned amorphous transition metal phosphate based active material; An anode made of potassium metal; Separation membrane; And an electrolytic solution prepared by dissolving 1 molar KPF ₆ in a mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC) in a ratio of 1: 1.

In order to accomplish the above object, the present invention also provides a cathode comprising the above-mentioned amorphous transition metal phosphate based active material; An anode made of zinc metal; And an electrolyte comprising zinc sulfate (ZnSO ₄ ).

In order to achieve the above object, the present invention also provides a cathode comprising a amorphous transition metal phosphate-based electrode active material; An anode made of a magnesium metal; And an electrolyte consisting of MgClO ₄ dissolved in acetonitrile. The present invention also provides a secondary battery comprising the same.

The present invention has the following excellent effects.

First, according to the present invention, a nano-sized amorphous transition metal phosphate-based electrode active material that facilitates mobility of charge carriers having a large ion size in an electrode active material can be produced.

In addition, according to the present invention, it is possible to provide a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion secondary battery, and a zinc ion secondary battery to which an amorphous transition metal phosphate type electrode active material having a nanosize size that facilitates mobility in charge carriers of ion- The battery and the magnesium ion can provide a secondary battery.

1 is a TEM photograph of an amorphous iron phosphate based active material synthesized according to a first embodiment of the present invention.
2 is a graph showing electrochemical characteristics of the lithium ion battery (a), the sodium ion battery (b), and the potassium ion battery (c) manufactured according to the second embodiment of the present invention.
Fig. 3 is a graph showing the results of measurement of the electrical properties of the electrode (a), the lithium ion battery (b) and the potassium ion battery (c) ≪ / RTI >
4 is a TEM photograph of an electrode active material extracted from a sodium ion battery and a lithium ion battery manufactured according to the second embodiment of the present invention.
5 is a STEM photograph of the amorphous iron phosphate based active material synthesized according to the first embodiment of the present invention.
FIG. 6 is a graph showing charge-discharge potential curves of a half cell manufactured using amorphous iron phosphate based active material synthesized according to the first embodiment of the present invention as a cathode active material and using zinc and magnesium metal as counter electrodes .

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals used to describe the present invention throughout the specification denote like elements.

The present invention is characterized in that the amorphous iron phosphate-based electrode active material has a nano-sized amorphous structure, so that charge carriers having a large ion size can be easily moved in the electrode active material.

Accordingly, the method for preparing an amorphous transition metal phosphate-based electrode active material of the present invention comprises: preparing a reaction solution by dissolving a transition metal precursor in distilled water and adding an organic solvent, and maintaining the reaction solution in the reaction solution for a predetermined time And a step of adding a solution in which phosphoric acid or phosphate is dissolved to the reaction solution and maintaining the reaction solution for a predetermined time to precipitate a nano-sized amorphous synthetic material, wherein the step of precipitating the synthesis material Filtering the precipitated synthetic material thereafter, and drying the filtered synthetic material.

First, in preparing the reaction solution, the transition metal precursor is dissolved in distilled water. At this time, various transition metal precursors can be used as the transition metal precursor, and it is preferable to use any one selected from the group consisting of transition metal acetate, transition metal acetylacetonate, and transition metal chloride.

It is preferable to use M (CH ₃ CO ₂ ) ₂ .H ₂ O (M is any one selected from the group consisting of Fe, Mn, Cu and Co) as the transition metal nitrate, desirable.

The transition metal acetylacetonate may be selected from the group consisting of iron acetylacetonate, manganese acetylacetonate, copper acetylacetonate, cobalt acetylacetonate, and vanadium acetylacetonate, and the transition metal chloride may be selected from the group consisting of MClx M is any one selected from the group consisting of Fe, Mn, Cu and Co) have.

The organic solvent is added to distilled water in which the transition metal precursor is dissolved to prepare a reaction solution. At this time, various organic solvents may be used as the organic solvent used in the present invention, but it is preferable to use any one selected from the group consisting of methanol, ethanol, propanol, butanol and pentanol. The ratio of the distilled water to the organic solvent is preferably in the range of 1: 1.5 to 1:10.

Subsequently, the reaction is maintained by keeping the reaction solution in the reaction solution for a predetermined time. At this time, the transition metal ion of the transition metal precursor reacts with the functional group of the organic solvent to form a transition metal alkoxide, and the organic solvent is subjected to a process of sticking a weak base. Here, the transition metal alkoxide is not precipitated because it exists in a dissolved state in an organic solvent containing the functional group.

The reaction holding step preferably maintains the reaction for about 5 to 10 minutes.

Next, a solution in which phosphoric acid or phosphate is dissolved is added to the reaction solution, and the mixture is allowed to stand for a predetermined time to cause the reaction to precipitate a nano-sized amorphous synthetic material. As a result, a nano-sized amorphous transition metal phosphate-based electrode active material can be obtained.

At this time, the molar ratio of the transition metal precursor and the solution in which the phosphoric acid or phosphate is dissolved is preferably in a range of 1: 0.5 to 1: 2, preferably 1: 1 Most preferred. Here, a solution in which ammonium hydrogen phosphate is dissolved as the solution in which the phosphate is dissolved may be used.

When a solution in which phosphoric acid or phosphate is dissolved is added to the reaction solution, the reaction occurs and precipitation occurs. It is preferable to maintain the reaction for 1 to 5 hours so that sufficient precipitation may occur.

Subsequently, the precipitated synthetic material is subjected to a filtering step and a drying step to obtain a nano-sized amorphous phosphate-based electrode active material. In the filtering step, the precipitated synthetic material is collected through a ceramic filter, and in the drying step, it is dried in a vacuum state at about 120 ° C for 12 hours or more.

The amorphous transition metal phosphate-based electrode active material produced by the above-described production method of the present invention has a nano-size and has the following chemical formula (1).

≪ Formula 1 >

M _x (PO ₄ ) _y wherein M is any one selected from the group consisting of Fe, Mn, Cu and Co.

As described above, the nano-sized amorphous transition metal phosphate-based electrode active material produced by the production method of the present invention has abundant surfaces on which charge carriers can react and is easily transported from the inside, The sieve can also be electrochemically inserted and removed, and exhibits excellent electrochemical characteristics. The nano-sized amorphous transition metal phosphate-based electrode active material produced by the method of the present invention can be used as an electrode to produce various secondary batteries.

And, The kind of the transition metal precursor (transition metal acetate or the like) used in the production method of the present invention, the kind of the organic solvent, the ratio of the distilled water and the organic solvent, the ratio of the transition metal precursor to the phosphoric acid, The type of precursor and the type of the final material.

Example 1

Commercial iron (II) acetate (Fe (II) acetate, Fe (CH ₃ CO ₂ ) ₂ .H ₂ O) was dissolved in distilled water at a concentration of 0.09 molar. Distilled water and methanol were added at a ratio of 1: 5 do. In this step, the iron metal ions react with the functional groups of the organic solvent to form an iron alkoxide, and the solvent undergoes a process of sticking a weak base. Iron alkoxide is not precipitated at this time. After maintaining the reaction for a certain period of time (5 to 10 minutes), phosphoric acid is added at a ratio of 1: 1 to iron (II) acetate. When phosphoric acid is added, the reaction is carried out to precipitate the synthetic material. The reaction is maintained for 2 hours or more so that the precipitation reaction can be sustained sufficiently. After the precipitation is completed, the precipitated synthetic material is collected through a ceramic filter and dried at 120 ° C for 12 hours or more to dry organic solvent and distilled water. In order to measure various characteristics of the synthetic material, pulverization was carried out using induction, and a measurement sample was obtained by re-drying at a vacuum of 250 캜 to remove residual moisture which was isolated in the synthetic material.

Example 2

The nano-sized amorphous iron phosphate electrode active material sample (40 wt%) obtained in Example 1 was mixed with carbon black (40 wt%) and PTFE binder (20 wt%) to prepare a paste. The paste was compressed on a stainless steel mesh Respectively. Next, the compressed paste mixture was stored in a vacuum oven at 120 ° C for 12 hours in order to remove moisture before manufacturing the coin cell. The prepared electrode was used as a cathode material and the lithium metal was mixed with a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), which contained an anode, celgard 2400 separator and LiPF ₆ at a molar concentration of 1: 1 2032 coin cells were constructed using electrolytes mixed in a volume ratio. Under the above conditions, the anode, the separator, and the electrolyte are differentiated according to the type of the charge carrier, that is, the battery system, and a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion secondary battery, And various batteries were manufactured.

Example 3

Lithium, sodium, and potassium secondary batteries fabricated in the same manner as in Example 2 were discharged for the first time in the voltage range (4.2-1.6V, 3.7-1.2V, 3.5-1.5V) corresponding to each system, After the second discharge, it is separated into an electrically insulated state, and each electrode is cleaned with a solution or mixed solution (DMC, PC, EMC) used for preparing each electrolyte to obtain each electrode. Each of the electrodes obtained by the above process was dried at room temperature under vacuum to prepare samples for ex-situ XRD and TEM analysis. In the case of an ex-situ TEM sample, the obtained electrode was dispersed in an electrode using an ultrasonic disperser, and a dispersed particle was extracted using a copper grid to prepare an analytical sample.

Experimental Example 1

SEM, HR-TEM image and SAED pattern of nano-sized amorphous iron phosphate electrode active material obtained from Example 1 were measured, and the results are shown in FIG.

It can be seen from FIG. 1 that the amorphous iron phosphate electrode active material exists in a spherical form of nanoparticles of 50 nm or less in aggregate, that is, amorphous form.

Experimental Example 2

The electrochemical characteristics of the lithium, sodium and potassium secondary battery coin cells were measured through the procedure of Example 2 using the amorphous iron phosphate electrode active material prepared in Example 1 as the cathode active material and the charge and discharge capacities Graphs of the potential curve and lifetime characteristics are shown in Fig. A sodium secondary battery other than a lithium secondary battery and a potassium secondary battery were each dissolved in propylene carbonate solvent and an electrolytic solution in which 1 molar concentration of NaClO ₄ salt was dissociated. In a mixed solvent of EC: EMC = 1: 1, 1 molar KPF ₆ were used, and a secondary battery was fabricated by using sodium metal and potassium metal as counter electrodes, respectively.

2, the prepared lithium secondary battery (a), sodium secondary battery (b) and potassium secondary battery (c) had capacities of 186 mAh / g, 179 mAh / g and 156 mAh / g, g), 3.7 to 1.2 V (10 mA / g) and 3.5 to 1.5 V (4 mA / g)), and all the secondary batteries except the potassium secondary battery corresponded to the theoretical capacity Or exceeded the dose indicated. Also, it was confirmed that excellent life characteristics of 101%, 99%, and 80% were exhibited even at the 50th charge / discharge capacity with respect to the initial capacity.

Experimental Example 3

Ex-situ X-ray diffraction analysis was performed to observe structural changes in the material inside the charge / discharge cycle of the amorphous iron phosphate electrode active material obtained in Example 1. The lithium, sodium, Potassium secondary battery. The results are shown in FIG. 3 (a, b, c).

3, the lithium secondary battery (b) does not clearly show the pattern of the new crystallinity according to charging and discharging. However, in the case of the sodium secondary battery and the potassium secondary battery (a, c) I could confirm that it appeared. Also, it was confirmed that the phenomenon becomes clearer as the ion radius of the charge transport material increases. Particularly, as a result of the potassium secondary battery, it was confirmed that potassium ion was inserted into amorphous iron phosphate during discharge to form monoclinic KFe ₂ (PO ₄ ) ₂ . The laboratory described this phenomenon as a reconstitutive reaction.

Experimental Example 4

Ex-situ bright field, dark field, and SAED patterns were measured for electrodes in which lithium and sodium ions were electrochemically implanted to obtain a more reasonable basis for the reconstitution reaction observed in Experimental Example 3. The results are shown in FIG. 4 Respectively.

It can be seen from FIG. 4 that the dark field (b) of the sodium phosphate-doped ferro-phosphorus electrode active material contains a very brightly shining particle cluster which appears as crystal grains, and the SAED pattern It can be seen that it represents the pattern of concentric circles spread. This means that the sodium phosphate-impregnated iron phosphate electrode active material exhibits local crystallinity. Ex-situ TEM analysis of lithium-doped iron phosphate (c, d) as well as sodium showed the same results.

Therefore, the results of Experimental Example 3 and Experimental Example 4 show that a pattern that can be distinguished from Ex-situ XRD of the electrode in which sodium and potassium are respectively inserted appears and that a pattern of concentric circles in the Ex-situ TEM shows that each ion Are inserted into iron phosphate and are locally crystalline, and it can be concluded that amorphous iron phosphate can accommodate ions of various sizes and crystallize when ions are inserted.

Example 4

Lithium and sodium were inserted into the iron phosphate obtained in Example 1 by a chemical method. For the chemical insertion of lithium into ferric phosphate, 0.01 mol of amorphous iron phosphate is dispersed in 35 ml of nucleic acid, mixed with 7 ml of n-butyl lithium at a molarity of 2.2, stirred for two days, and then the sample is washed And dried in a vacuum. In the case of the chemical insertion process of sodium, 87 mg of sodium metal was dissolved in 10 ml of 1 molal biphenyl DME, and the amorphous iron phosphate was added to the solution, stirred for one day, washed in DME, filtered and dried in vacuum. All of the above processes are carried out in an Ar atmosphere, but the present invention is not limited thereto and can be carried out in all the inert gas atmosphere.

Experimental Example 5

In order to more clearly support the conclusions of Experimental Examples 3 and 4, HR-TEM analysis was performed by inserting lithium and sodium into the amorphous iron phosphate electrode active material obtained from Example 1, and the results are shown in FIG.

From FIG. 5, it can be seen that the HR-TEM image for pure amorphous iron phosphate (a) clearly shows that no distinguishable lattice arrangement appears, which means that the atoms do not form a crystal structure. However, it can be seen that the image of the amorphous iron phosphate electrode active material in which lithium (c) and sodium (b) are chemically inserted shows a clearly distinguishable lattice arrangement. The values of the interplanar spacings 2.72 and 3.36 Ohm Strong (Å) measured in FIG. 5 (b) are consistent with the interplanar spacing for the faces corresponding to the Miller indices of (014) and (121) in the crystal structure of NaFePO ₄ I could. Similarly, the values of the interplanar spacings 2.49 and 2.38 Ohm Strong (Å) measured in FIG. 5 (c) are the interplanar spacings for the plane corresponding to the Miller index of (311) and (410) in the crystal structure of LiFePO ₄ , respectively And this result clearly supports the logic of the reconstruction reaction.

Experimental Example 6

Zinc and magnesium ions with a bivalent oxidation number are known to be capable of expressing a high capacity because they can store two charges per one ion although the ionic radius is large. Therefore, in Experimental Example 6, an experiment was conducted on a battery system using zinc and magnesium as charge carriers and amorphous phosphate capable of accepting them as a cathode. FIG. 6 shows the electrochemical characteristics of a charge transporting material having a divalent oxidation number based on the results of Experimental Examples 1 to 5. In the zinc ion secondary battery system, an electrode made of the process described in Example 2 was made of an electrolyte including a cathode, a zinc metal anode, and a molybdenum ZnSO ₄ (zinc sulfate) electrolyte, and a 1.8 to 0.5 V Characterization was performed under a voltage range and a current density of 10 mA / g.

FIG. 6A shows the electrochemical characteristics of the zinc ion secondary battery, showing a capacity of 96 mAh / g. Similarly, in the magnesium ion secondary battery system, a solution prepared by dissolving an electrode manufactured by the process described in Example 2 in a cathode, an anode of magnesium metal, and Mg (ClO ₄ ) ₂ of 1 molal concentration in acetonitrile Electrolyte and characterization was performed under a voltage range of 1.7 to 0.4 V and a current density of 5 mA / g. The result is shown in FIG. 6B, which shows that the capacity of 131 mAh / g is shown. These results show applicability to zinc and magnesium ion secondary battery systems, which have not been applied to battery systems due to their large ionic radius.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications may be made by those skilled in the art.

Claims (12)

Dissolving the transition metal precursor in distilled water, and adding an organic solvent to prepare a reaction solution:
A reaction maintaining step of keeping the reaction solution in the reaction solution for a predetermined time; And
Adding a solution in which phosphoric acid or phosphate is dissolved to the reaction solution, and maintaining the reaction solution for a predetermined time to precipitate a nano-sized amorphous synthetic material. The method according to claim 1,
Wherein the transition metal precursor is any one selected from the group consisting of transition metal acetate, transition metal acetylacetonate, and transition metal chloride. 3. The method of claim 2,
Wherein the transition metal acetate salt is any one selected from the group consisting of M (CH ₃ CO ₂ ) ₂ .H ₂ O (M is Fe, Mn, Cu and Co). . 3. The method of claim 2,
Wherein the transition metal acetylacetonate is any one selected from the group consisting of iron acetylacetonate, manganese acetylacetonate, copper acetylacetonate, cobalt acetylacetonate, and vanadium acetylacetonate. The amorphous transition metal phosphate- ≪ / RTI > 3. The method of claim 2,
Wherein the transition metal chloride is MCl x (M is any one selected from the group consisting of Fe, Mn, Cu and Co). 6. The method according to any one of claims 1 to 5,
Wherein the organic solvent is any one selected from the group consisting of methanol, ethanol, propanol, butanol, and pentanol. The method according to claim 6,
Wherein the ratio of the distilled water to the organic solvent is 1: 1.5 to 1:10. The method for producing an amorphous transition metal phosphate-based electrode active material according to claim 1, The method according to claim 6,
Wherein the molar ratio of the transition metal precursor to the solution in which the phosphate or phosphate is dissolved is in the range of 1: 0.5 to 1: 2. 6. The method according to any one of claims 1 to 5,
After the step of precipitating the synthetic material
Filtering the precipitated synthetic material; And
And drying the filtered synthetic material. The method of manufacturing an amorphous transition metal phosphate-based electrode active material according to claim 1, 6. The method according to any one of claims 1 to 5,
Wherein the nano-sized amorphous synthetic material is represented by the following formula (1).
≪ Formula 1 >
M _x (PO ₄ ) _y
Wherein M is any one selected from the group consisting of Fe, Mn, Cu and Co. The amorphous transition metal phosphate-based electrode active material produced by the method of claim 10. 12. The method of claim 11,
The amorphous transition metal phosphate based electrode active material is used as a cathode electrode of any one selected from the group consisting of a lithium secondary battery, a sodium secondary battery, a potassium secondary battery, a zinc ion secondary battery, and a magnesium ion secondary battery. Amorphous transition metal phosphate based electrode active material.

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