CN101710619A - Electrode plate for lithium ion battery and manufacturing method thereof - Google Patents

Abstract

An electrode pole piece of a lithium ion battery and a manufacturing method thereof, in particular to a lithium ion battery electrode pole piece using multilayer graphene as a conductive agent and a production method thereof. The electrode sheet of the present invention is composed of positive or negative active material, conductive agent and binder; the method of the present invention is to use positive or negative active material, conductive agent and binder as raw materials, and obtain electrode slurry after stirring and dispersing material, and then made by coating, drying, and tableting. The conductive agent adopted in the invention has the advantages of strong dispersibility, high conductivity, good filling effect, etc. The method of the invention is simple, the production cost is low, and it is convenient for popularization and application. The method of the invention can significantly improve the electrical conductivity, electrochemical capacity and rate charge-discharge capability of the electrode material, so the invention can be widely used in the preparation of electrode pole pieces of lithium-ion batteries.

Description

A kind of electrode pole sheet of lithium ion battery and manufacturing method thereof

technical field

The invention belongs to the technical field of carbon materials and chemical power sources, and in particular relates to lithium-ion battery electrode pole pieces using multilayer graphene as a conductive agent and a manufacturing method thereof.

Background technique

As a new type of green secondary battery with high specific energy, lithium-ion battery occupies a leading position in the market of mobile phones, notebook computers, cameras, etc., and has become the main power source of small civilian electronic products. With the research and development of high-power lithium-ion battery packs, the application of lithium-ion batteries is rapidly expanding to fields such as electric vehicles, space satellites, military communications, and aviation and navigation.

In fact, the conductivity of the positive electrode material of lithium ion battery is very poor, and its conductivity is between 10 ^-4 -10 ^-9 S/cm. In order to enhance the conductivity of the positive electrode material, 5-20wt.% conductive carbon black needs to be added in the positive electrode production process. At present, many researchers at home and abroad use carbon nanotubes or carbon nanofibers as conductive agents for lithium-ion batteries. Existing lithium-ion battery electrode materials and preparation methods thereof, such as the patent "High-power and large-capacity lithium-ion battery positive electrode sheet and its manufacturing method" patent published on December 12, 2007 with the publication number CN 10108701 7A, the disclosed positive electrode The sheet is composed of positive electrode material, conductive agent, binder and current collector, wherein the weight percentages of positive electrode material, binder and conductive agent are respectively 75-95%, 2-15%, 1-15%, and the positive electrode material It is lithium iron phosphate, or modified lithium iron phosphate, or a mixture of lithium iron phosphate and lithium cobaltate or lithium manganate. The conductive agent is one or a mixture of two or more of carbon nanotubes, carbon fibers, acetylene black, superconducting carbon black, and conductive graphite. The steps of the preparation method of the positive electrode sheet are: 1. Dispersion: adding carbon nanotubes and carbon fibers to deionized water or an organic dispersant for ultrasonic dispersion, adding the binder to a solvent for stirring and dispersing; 2. Preparing the positive electrode slurry 3. Make the positive pole piece. The main disadvantages of this patent are: special dispersion of carbon nanotubes and carbon fibers is required, and it is difficult to ensure the uniformity of dispersion of carbon nanotubes by means of ultrasonic dispersion and stirring, and the uniformity of dispersion of carbon nanotubes will directly affect lithium For the electrochemical capacity of the ion battery, the method of the invention has many steps, and the dispersion effect of the conductive agent is difficult to control, so it is not suitable for industrialized production. However, the research on multilayer graphene as a conductive agent for lithium-ion batteries has not yet been reported in domestic and foreign journals and patent materials.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the existing lithium ion battery electrodes and their manufacturing methods, provide a lithium ion battery electrode pole piece and its manufacturing method, change the conductive contact mode between the conductive agent and the electrode active material, improve The electrochemical capacity of the electrode active material is improved, and it has the advantages of low production cost, strong conductivity, and good filling effect.

The technical scheme that realizes the object of the present invention is: a kind of composition and mass percent thereof of the electrode pole piece of lithium-ion battery are as follows:

Positive or negative active material (75～98)%

Conductive agent (1～15)%

Binder (1～10)%

Wherein: the positive electrode active material is a layered compound (its chemical formula is LiNi _1-xy Co _x M _y O ₂ , where M is Al, Mg, Mn or Cr, 0≤x≤1, 0≤y≤ 1, and x+y≤1), or a spinel-type compound (its chemical formula is LiMn ₂ O ₄ ), or an olivine-type compound (its chemical formula is LiFePO ₄ ), or the above-mentioned compounds have undergone lattice doping or surface carbon Coated compound;

The negative electrode active material is carbon material or transition metal oxide. The carbon negative electrode material is natural graphite, or artificial graphite, or pitch coke, or carbon fiber, or amorphous carbon; the transition metal oxide is LiTi ₂ O ₄ , or Li ₄ Ti ₅ O ₁₂ ;

The conductive agent is 1-3 of multilayer graphene, carbon nanotubes, and carbon black, one of which must be multilayer graphene. Wherein the mass percentages of multilayer graphene, carbon nanotubes and carbon black in the mixture are (30-100)%, (0-50)%, (0-50)% respectively;

The binder is polytetrafluoroethylene (PTFE), or polyvinylidene fluoride (PVDF), or styrene-butadiene latex (SBR).

The dispersant used is deionized water or N-methylpyrrolidone.

A method for manufacturing lithium-ion battery electrode sheets: using positive or negative active materials, conductive agents, and binders as raw materials, stirring and dispersing to prepare electrode slurry, and then coating, drying, and tableting. finished product. Specific steps are as follows:

(1) material preparation

Raw materials are prepared according to the mass ratio of positive or negative active material: conductive agent: binder (75-98)%: (1-15)%: (1-10)%.

Among them: the positive electrode active material is a layered compound (its chemical formula is LiNi _1-xy Co _x M _y O ₂ , where M is Al, Mg, Mn or Cr, 0≤x≤1, 0≤y≤1, and x+y≤1), or a spinel-type compound (its chemical formula is LiMn ₂ O ₄ ), or an olivine-type compound (its chemical formula is LiFePO ₄ ), or the above-mentioned compounds are lattice doped or surface carbon coated Treated compounds;

The negative electrode active material is carbon material or transition metal oxide. The carbon negative electrode material is natural graphite, or artificial graphite, or pitch coke, or carbon fiber, or amorphous carbon; the transition metal oxide is LiTi ₂ O ₄ , or Li ₄ Ti ₅ O ₁₂ ;

The conductive agent is 1-3 of multilayer graphene, carbon nanotubes, and carbon black, one of which must be multilayer graphene. Wherein the mass percentages of multilayer graphene, carbon nanotubes and carbon black in the mixture are 30-100%, 0-50%, and 0-50% respectively;

The binder is polytetrafluoroethylene (PTFE), or polyvinylidene fluoride (PVDF), or styrene-butadiene latex (SBR).

(2) Preparation of electrode slurry

After step (1) is completed, add the conductive agent to the dispersant according to the ratio of the conductive agent mass (g) in the step (1): the volume of the dispersant (ml) is 1:10-30, and continue to stir Until the conductive agent is completely dispersed, then add the binder into the resulting suspension, continue to stir until the binder is completely dissolved, then add the positive electrode or negative active material prepared in step (1) into the mixed solution, and then Add a dispersant and keep stirring evenly to make a positive or negative electrode slurry with a viscosity of 4000-12000Pa.s;

Wherein: the dispersant is deionized water, or N-methylpyrrolidone;

(3) Coating, drying, tableting

After the (2) step is completed, the positive electrode slurry prepared in the (2) step is coated on the aluminum foil, or the prepared negative electrode slurry is coated on the copper foil, and the coating thickness is 80 -200 μm, then vacuum-dried at 100-150° C. for 4-10 hours, and finally pressed in a roller press or flat press to obtain a positive or negative electrode sheet with a thickness of 60-120 μm.

After the present invention adopts above-mentioned technical scheme, mainly have following effect:

(1) The conductive agent of the present invention adopts multilayer graphene, or a mixture of multilayer graphene, carbon nanotubes, and carbon black, which has the advantages of strong dispersibility, high electrical conductivity, and good filling effect, and fundamentally changes the electrical conductivity. The conductive contact interface between the agent and the electrode active material can significantly improve the conductivity, electrochemical capacity and rate charge and discharge capacity of the lithium ion battery electrode material;

(2) The present invention has simple process, convenient operation, low production cost, and is convenient for industrialized production.

The invention can be widely used in making positive and negative electrode pole pieces of lithium ion batteries.

Description of drawings

FIG. 1 is a curve diagram of the cycle capacity of the negative electrode sheet of Example 6. FIG.

In the figure: curve a is the cycle capacity curve of natural graphite and carbon black composite; curve b is the cycle capacity curve of natural graphite and multilayer graphene composite.

FIG. 2 is a scanning electron microscope picture of the negative electrode sheet of Example 6. FIG.

In the picture: 1 multi-layer graphene, 2 graphite.

Detailed ways

The present invention will be further described below in combination with specific embodiments.

Example 1

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Positive active material 90wt.%

Conductive agent 5wt%

Binder 5wt%

Wherein: the positive electrode active material is layered lithium cobalt oxide, that is, the chemical formula is LiCoO ₂ ; the conductive agent is multi-layer graphene; the binder is polytetrafluoroethylene (PTFE).

The concrete steps of a kind of lithium-ion battery electrode pole sheet manufacturing method are as follows:

(1) material preparation

Prepare the raw materials according to the ratio of positive electrode active material: conductive agent: the mass ratio of binder is 90:5:5, wherein: wherein: the positive electrode active material is a layered compound, and its chemical formula is LiCoO ₂ ; the conductive agent is a multilayer Graphene; binder is polytetrafluoroethylene;

(2) Preparation of electrode slurry

After step (1) is completed, add the conductive agent to the dispersant according to the ratio of the mass (g) of the conductive agent in step (1): the volume (ml) of the dispersant is 1:20, and continue to stir Add the binder until the conductive agent is completely dispersed, and then continue to stir until the binder is completely dissolved, then add the positive electrode active material (ie LiCoO ₂ ) prepared in step (1) into the mixed solution, add the dispersant And continue to stir evenly to make a positive electrode slurry with a viscosity of 6000Pa.s;

Wherein: the dispersant is N-methylpyrrolidone.

(3) Coating, drying, tableting

After step (2) is completed, apply the positive electrode slurry prepared in step (2) on the aluminum foil with a coating thickness of 120 μm, dry it in vacuum at 120°C for 6 hours, and then press it in a roller press A positive electrode sheet having a thickness of 100 μm was obtained.

Example 2

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Positive active material 75wt.%

Conductive agent 15wt%

Binder 10wt%

Wherein: the positive electrode active material is olivine-type lithium iron phosphate oxide, and its chemical formula is LiFePO ₄ ; the conductive agent is multi-layer graphene; the binder is polytetrafluoroethylene.

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In step (1), the mass ratio of positive electrode active material: conductive agent: binder is 75:15:10;

Among them: the positive electrode active material is olivine-type lithium iron phosphate oxide, and its chemical formula is LiFePO ₄ ; the conductive agent is multi-layer graphene; the binder is polytetrafluoroethylene;

In the (2) step, the mass (g) of the conductive agent: the ratio of the dispersant volume (ml) is 1: 20, and the viscosity modulation of the positive electrode slurry is 7000Pa.s;

Example 3

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Positive electrode active material 98wt.%

Conductive agent 1wt%

Binder 1wt%

Among them: the positive electrode active material is spinel lithium manganese oxide, that is, the chemical formula is LiMn ₂ O ₄ ; the conductive agent is a mixture of multilayer graphene and carbon black, and the mass ratio of the two is 1:1; the binder It is polytetrafluoroethylene (PTFE).

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In step (1), the mass ratio of positive electrode active material: conductive agent: binder is 98:1:1, wherein: the positive electrode active material is spinel lithium manganese oxide, and its chemical formula is LiMn ₂ O ₄ ; The conductive agent is a mixture of multilayer graphene and carbon black, and the mass ratio of the two is 1:1; the binder is polytetrafluoroethylene;

In step (2), the ratio of the mass (g) of the conductive agent to the volume (ml) of the dispersant is 1:15, and the viscosity of the positive electrode slurry is adjusted to be 12000Pa.s;

In step (3), the coating thickness of the positive electrode slurry was 80 μm, the drying condition was vacuum drying at 150° C. for 4 hours, and the positive electrode sheet was pressed in a flat press to obtain a positive electrode sheet with a thickness of 60 μm.

Example 4

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Positive electrode active material 85wt.%

Conductive agent 8wt%

Binder 7wt%

Among them: the positive electrode active material is layered lithium nickel cobalt manganese oxide, that is, the chemical formula is LiNi _1/3 Co _1/3 Mn _1/3 O ₂ ; the conductive agent is a mixture of multilayer graphene and carbon nanotubes. The mass ratio of those is 1:1; the binder is polyvinylidene fluoride (PVDF).

The concrete steps of a kind of lithium-ion battery electrode pole sheet manufacturing method are the same as embodiment 1, wherein:

In the first step (1), the mass ratio of positive electrode active material: conductive agent: binder is 85:8:7, wherein: the positive electrode active material is layered lithium nickel cobalt manganese oxide, and its chemical formula is LiNi _{1/ 3} Co _1/3 Mn _1/3 O ₂ The conductive agent is a mixture of multilayer graphene and carbon nanotubes, the mass ratio of the two is 1:1; the binder is polyvinylidene fluoride;

In the (2) step, the mass (g) of the conductive agent: the ratio of the dispersant volume (ml) is 1: 10, and the viscosity modulation of the positive electrode slurry is 5000Pa.s;

In step (3), the coating thickness of the positive electrode slurry is 150 μm, the drying condition is vacuum drying at 100° C. for 10 hours, and the thickness of the positive electrode sheet is 120 μm.

Example 5

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Positive electrode active material 98wt.%

Conductive agent 1wt%

Binder 1wt%

Among them: the positive electrode active material is lithium nickel cobalt aluminum oxide, its chemical formula is LiNi _0.7 Co _0.2 Al _0.1 O ₂ ; the conductive agent is a mixture of multilayer graphene, carbon nanotubes and carbon black, and the mass ratio of the three is 3 : 3: 4; the binder is polyvinylidene fluoride.

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In step (1), the mass ratio of positive electrode active material: conductive agent: binder is 86:6:8, wherein: the positive electrode active material is lithium nickel cobalt aluminum oxide, and its chemical formula is LiNi _0.7 Co _0.2 Al _0.1 O ₂ ; the conductive agent is a mixture of multilayer graphene, carbon nanotubes and carbon black, and the mass ratio of the three is 3:3:4; the binder is polyvinylidene fluoride;

In step (2), the ratio of the mass (g) of the conductive agent to the volume (ml) of the dispersant is 1:30, and the viscosity of the positive electrode slurry is adjusted to 4000Pa.s;

In step (3), the coating thickness of the positive electrode slurry is 200 μm, the drying condition is vacuum drying at 150° C. for 10 hours, and pressing in a flat press to obtain a positive electrode sheet with a thickness of 120 μm.

Example 6

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Negative active material 85wt.%

Conductive agent 7wt.%

Binder 8wt%

Wherein: the negative electrode active material is natural graphite, the conductive agent is multilayer graphene, and the binder is styrene-butadiene latex.

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In the (1) step, the mass ratio of negative electrode active material: conductive agent: binder is 85:7:8, wherein: the negative electrode active material is natural graphite, the conductive agent is multilayer graphene, and the binder is butylene Benzene latex;

In step (2), the ratio of the conductive agent mass (g) to the dispersant volume (ml) is 1:15, the dispersant is deionized water, and the viscosity of the negative electrode slurry is adjusted to 8000Pa.s

Example 7

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Carbon anode material 98wt.％

Conductive agent 1wt%

Binder 1wt%

Wherein: the negative electrode active material is artificial graphite, that is, graphitized mesophase carbon microspheres, the conductive agent is multi-layer graphene, and the binder is styrene-butadiene latex.

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In the (1) step, the mass ratio of negative electrode active material: conductive agent: binder is 90:5:5, wherein: the negative electrode active material is artificial graphite, i.e. graphitized mesophase carbon microspheres, and the conductive agent is polycarbonate Layer graphene, the binder is styrene-butadiene latex;

In the (2) step, the ratio of the mass (g) of the conductive agent to the volume (ml) of the dispersant is 1:20, and the viscosity of the negative electrode slurry is 9000Pa.s;

Example 8

A kind of component and the mass percent thereof of lithium-ion battery electrode pole piece are:

Anode material 75wt.%

Conductive agent 15wt%

Binder 10wt%

Among them: the negative electrode material is transition metal oxide LiTi ₂ O ₄ , the conductive agent is a mixture of multilayer graphene, carbon nanotubes and carbon black, the mass ratio of the three is 1:1:1, and the binder is polytetrafluoroethylene Vinyl fluoride (PTFE).

A kind of specific steps of the method for making electrode pole piece of lithium ion battery, the same as embodiment 1, wherein:

In step (1), the mass ratio of negative electrode active material: conductive agent: binder is 75:15:10, wherein: the negative electrode material is transition metal oxide LiTi ₂ O ₄ , and the conductive agent is multi-layer graphene, A mixture of carbon nanotubes and carbon black, the mass ratio of the three is 1:1:1, and the binder is polytetrafluoroethylene;

test results

The negative pole sheet _that embodiment 6 prepares is carried out the test of electrochemical performance, and test condition is that lithium sheet counter electrode, with 1mol/LLiPF soluble in volume ratio is 1: 1 ethylene carbonate/diethyl carbonate (ethyl Carbonate/diethyl carbonate, EC/DEC) is the electrolyte, the diaphragm is Celgard 2400, the room temperature is 20°C, and the cut-off voltage is 0.0-2.0V. The test results are shown in Figure 1.

From the above test results, it can be known that the negative electrode composited by multi-layer graphene and natural graphite has a cycle capacity of 363mAh/g under the condition of a charge-discharge rate of 0.1C; using traditional carbon black as a conductive agent, the cycle capacity of natural graphite is 344mAh/g. g; It is confirmed by experiments that the novel conductive agent prepared by the method of the present invention can enhance the electrochemical capacity and fast charge and discharge performance of lithium-ion batteries.

Claims (10)

1. the electrode plates of a lithium ion battery is characterized in that its component and mass percent thereof are:

Negative or positive electrode active material (75～98) wt.%

Conductive agent (1～15) wt.%

Binding agent (1～10) wt%

Wherein: described positive active material is the layered-type compound, and promptly chemical formula is LiNi _1-x-yCo _xM _yO ₂, the M in the formula is Al, Mg, Mn or Cr, 0≤x≤1,0≤y≤1, and x+y≤1, and perhaps spinel-type compound, promptly chemical formula is LiMn ₂O ₄, olivine compounds, promptly chemical formula is LiFePO ₄, or the compound after above-claimed cpd process impurity or the surface carbon coating processing;

Described negative electrode active material is raw material of wood-charcoal material or transition metal oxide; Wherein: described carbon cathode material is a native graphite, perhaps electrographite, perhaps pitch coke, perhaps carbon fiber, perhaps amorphous carbon; Described transition metal oxide is LiTi ₂O ₄, perhaps Li ₄Ti ₅O ₁₂

Described conductive agent is multi-layer graphene or carbon nano-tube or carbon black or two or three mixture wherein, but wherein a kind of multi-layer graphene that is necessary for, wherein multi-layer graphene, carbon nano-tube and the carbon black mass percent in the hybrid conductive agent is respectively 10-100wt%, 0-50wt%, 0-50wt%;

Described binding agent is polytetrafluoroethylene or polyvinylidene fluoride or butadiene-styrene latex.

2. a kind of lithium ion cell electrode pole piece according to claim 1 is characterized in that its component and mass percent thereof are:

Positive active material 90wt.%

Conductive agent 5wt%

Binding agent 5wt%

Wherein: positive active material is the layered-type lithium and cobalt oxides, and promptly chemical formula is LiCoO ₂Conductive agent is a multi-layer graphene; Binding agent is a polytetrafluoroethylene.

3. a kind of lithium ion cell electrode pole piece according to claim 1 is characterized in that its component and mass percent thereof are:

Positive active material 75wt.%

Conductive agent 15wt%

Binding agent 10wt%

Wherein: positive active material is an olivine-type LiFePO4 oxide, and its chemical formula is LiFePO ₄Conductive agent is the mixture of multi-layer graphene and carbon black, and both mass ratioes are 1: 1; Binding agent is a polyvinylidene fluoride.

4. a kind of lithium ion cell electrode pole piece according to claim 1 is characterized in that its component and mass percent thereof are:

Positive active material 98wt.%

Conductive agent 1wt%

Binding agent 1wt%

Wherein: positive active material is a spinel lithium manganese oxide, and promptly chemical formula is LiMn ₂O ₄Conductive agent is a multi-layer graphene; Binding agent is a polytetrafluoroethylene.

5. a kind of lithium ion cell electrode pole piece according to claim 1 is characterized in that its component and mass percent thereof are:

Negative electrode active material 85wt.%

Conductive agent 7wt.%

Binding agent 8wt%

Wherein: carbon anode active material is a native graphite, and conductive agent is a multi-layer graphene, and binding agent is a butadiene-styrene latex.

6. a kind of lithium ion cell electrode pole piece according to claim 1 is characterized in that its component and mass percent thereof are:

Negative electrode active material 98wt.%

Conductive agent 1wt%

Binding agent 1wt%

Wherein: carbon anode active material is an electrographite, i.e. graphitization carbonaceous mesophase spherules, and conductive agent is a multi-layer graphene, binding agent is a butadiene-styrene latex.

7. a kind of lithium ion battery negative conductive agent material according to claim 1 is characterized in that its component and mass percent thereof are:

Negative electrode active material 75wt.%

Conductive agent 15wt%

Binding agent 10wt%

Wherein: negative electrode active material is transition metal oxide LiTi ₂O ₄, conductive agent is the mixture of multi-layer graphene, carbon nano-tube and carbon black, and three's mass ratio is 1: 1: 1, and binding agent is a polytetrafluoroethylene.

8. the manufacture method of a lithium ion cell electrode pole piece is characterized in that concrete method step is as follows:

(1) gets the raw materials ready

According to the negative or positive electrode active material: conductive agent: the quality proportioning of binding agent is (75-98) %: (1-15) %: (1-10) ratio of % is got all the raw material ready;

Wherein: positive active material is the layered-type compound, and its chemical formula is LiNi _1-x-yCo _xM _yO ₂, the M in the formula is Al, Mg, Mn or Cr, 0≤x≤1,0≤y≤1, and x+y≤1, and perhaps spinel-type compound, its chemical formula is LiMn ₂O ₄, perhaps olivine compounds, its chemical formula is LiFePO ₄, perhaps above-claimed cpd process impurity or surface carbon coat the compound after handling;

Negative electrode active material is raw material of wood-charcoal material or transition metal oxide, and wherein: described carbon cathode material is a native graphite, perhaps electrographite, perhaps pitch coke, perhaps carbon fiber, perhaps amorphous carbon; Described transition metal oxide is LiTi ₂O ₄, perhaps Li ₄Ti ₅O ₁₂

Conductive agent is two or three mixture in multi-layer graphene, carbon nano-tube, the carbon black, wherein a kind of multi-layer graphene that is necessary for.Wherein multi-layer graphene, carbon nano-tube and the carbon black mass percent in mixture is respectively 30-100%, 0-50%, 0-50%;

Binding agent is polytetrafluoroethylene or polyvinylidene fluoride or butadiene-styrene latex;

(2) preparation electrode slurry

(1) step finish after, quality according to (1) conductive agent that goes on foot: the volume ratio of dispersant is 1: the ratio of 10-30, conductive agent is joined in the dispersant, continue to stir and disperse fully until conductive agent, again binding agent is joined in the suspension-turbid liquid of gained, continue to stir and dissolve fully until binding agent, then positive pole or negative electrode active material are added in its mixed solution, add dispersant again, and continue to stir, making viscosity is the negative or positive electrode electrode slurry of 4000-12000Pa.s;

Wherein: dispersant is a deionized water, perhaps the N-methyl pyrrolidone;

(3) coating, dry, compressing tablet

(2) step finish after, with (2) the anode electrode slurry coating that makes of step on aluminium foil, perhaps with prepared negative electrode slurry coating on Copper Foil, applied thickness is 80-200 μ m, at 100-150 ℃ of following vacuumize 4-10 hour, the last compacting in roll squeezer or spreader bar obtained the negative or positive electrode electrode plates that thickness is 60-120 μ m then.

9. according to the electrode plates manufacture method of the described a kind of lithium ion battery of claim 8, it is characterized in that:

In (1) step, positive active material: conductive agent: the quality proportioning of binding agent is 90: 5: 5, and wherein: positive active material is LiCoO ₂, conductive agent is a multi-layer graphene, binding agent is a polytetrafluoroethylene;

In (2) step, the quality of conductive agent: the volume ratio of dispersant is 1: 20, and dispersant is the N-methyl pyrrolidone, makes year to be the anode electrode slurry of 6000Pa.s;

In (3) step, on aluminium foil, applied thickness is at 120 μ m with the anode electrode slurry coating that makes, and 120 ℃ of following vacuumizes 6 hours, compacting obtained the positive electrical pole piece that thickness is 100 μ m in roll squeezer.

10. according to the electrode plates manufacture method of the described a kind of lithium ion battery of claim 8, it is characterized in that:

In (1) step, negative electrode active material: conductive agent: the quality proportioning of binding agent is 85: 7: 8, and wherein: negative electrode active material is a native graphite, and conductive agent is a multi-layer graphene, and binding agent is a butadiene-styrene latex;

(2) step in, the quality of conductive agent (g): with volume (ml) ratio of dispersant be 1: 15, dispersant is a deionized water, the viscosity of cathode size is 8000Pa.s;

In (3) step, on Copper Foil, applied thickness is 120 μ m with the negative electrode slurry coating, and 120 ℃ of following vacuumizes 6 hours, compacting obtained the negative electricity pole piece that thickness is 100 μ m in roll squeezer.

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