CN115224346B - Lithium ion battery - Google Patents
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- CN115224346B CN115224346B CN202210857284.0A CN202210857284A CN115224346B CN 115224346 B CN115224346 B CN 115224346B CN 202210857284 A CN202210857284 A CN 202210857284A CN 115224346 B CN115224346 B CN 115224346B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the technical field of secondary batteries, and particularly relates to a lithium ion battery, which comprises a battery core and electrolyte, wherein the battery core comprises a positive pole piece, a negative pole piece and an isolating film; the electrolyte comprises a solvent, lithium salt and an additive, wherein the lithium salt and the additive comprise a boron-containing compound; wherein, the lithium ion battery satisfies the following relation: n=e ‑(4C+f); n represents the mass percentage content of boron element in the solid electrolyte interface film, and the unit is wt%; c represents the mass percentage content of cobalt element in the positive electrode active material, and the unit is wt%; f is a relationship number ranging from 3.92 to 6.00. The lithium ion battery provided by the invention has good high-temperature stability and cycle performance.
Description
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a lithium ion battery.
Background
Lithium ion batteries have been widely used as energy storage media, and their fields of use have been penetrated into various directions of life. The lithium ion battery is used in daily life of people, and has high requirements on cycle life and safety performance.
The main factors of the safety performance of the lithium ion battery are the design, the manufacturing process, the positive electrode material and the electrolyte of the lithium ion battery. The design and manufacturing process of lithium ion batteries have been developed with the development of battery technology, and there are several links in the production process of lithium ion batteries to detect the rationality in these two directions. The positive electrode material and the electrolyte become key factors of the current cycle and safety performance of the lithium ion battery.
In order to increase the energy density of lithium ion batteries, nickel cobalt manganese/lithium aluminate oxides are used in large amounts due to their relatively high gram capacity. In the nickel cobalt manganese/lithium aluminate oxide, cracks are formed on active material particles due to great volume change and great stress on the lattice structure during the intercalation and deintercalation of lithium, and the cracks are further deepened under the action of HF generated by side reaction of electrolyte during the circulation process, and simultaneously, metal elements are solvated, so that the dissolution of transition metal elements is caused. After the transition metal element is dissolved, the transition metal element is deposited on the surface of the anode active material along with the charge-discharge process, and the electrolyte membrane SEI on the surface of the anode active material is destroyed, so that the electrolyte is in direct contact with the anode active material, side reaction is increased, and capacity attenuation is accelerated. At present, an effective additive is generally used for forming a film on the surface of a negative electrode to solve the influence of excessive metal element dissolution on the interface of the negative electrode, but the influence of cobalt element dissolution on the structural stability of nickel cobalt manganese/lithium aluminate oxide is less concerned in the industry.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the lithium ion battery with good negative electrode interface and capable of avoiding dissolution of transition metal is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the lithium ion battery comprises an electric core and electrolyte, and is characterized in that the electric core comprises a positive pole piece, an isolating film and a negative pole piece; the electrolyte comprises a solvent, lithium salt and an additive, wherein the lithium salt and the additive comprise a boron-containing compound;
The positive electrode plate comprises a positive electrode active material layer containing a positive electrode active material of cobalt element, the surface of the positive electrode active material layer forms a solid electrolyte interface film after the lithium ion battery is charged and discharged,
Wherein, the lithium ion battery satisfies the following relation:
n＝e-(4C+f)；
n represents the mass percentage content of boron element in the solid electrolyte interface film, and the unit is wt%;
C represents the mass percentage content of cobalt element in the positive electrode active material, and the unit is wt%;
f is a relationship number ranging from 3.92 to 6.00.
Preferably, the boron-containing compound is one or more of boron-containing esters, boron-containing lithium salts and boron-containing alkanes.
Preferably, the boron-containing compound is one or more of lithium dioxaborate, lithium difluorooxalato borate, lithium tetrafluoroborate, tris (trimethylsilane) borate and tris (pentafluorophenyl) borane.
Preferably, the weight percentage of the boron-containing compound in the electrolyte is 0.1-15 wt%.
Preferably, the ratio of the electrolyte mass to the nominal capacity is 1.5g/Ah to 5.5g/Ah.
Preferably, the additive in the electrolyte contains a sulfur-containing compound.
Preferably, the mass percentage of boron element in the solid electrolyte interface film is 0.05-1.5 wt%.
Preferably, the mass percentage of cobalt element in the positive electrode active material is 2-25 wt%.
Preferably, the active material on the negative electrode plate is one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microsphere, silicon-based material, tin-based material and lithium titanate.
The graphite is selected from artificial graphite, natural graphite or a mixture of the artificial graphite and the natural graphite, the silicon-based material can be selected from one or more of simple substance silicon, silicon oxygen compound, silicon carbon compound and silicon alloy, and the tin-based material can be selected from one or more of simple substance tin, tin oxygen compound and tin alloy.
Preferably, the positive electrode active material includes a positive electrode active material having a chemical formula of Li 1+xCOaNibM1-a-bO2, -0.1.ltoreq.x.ltoreq.0.2, 0< a <1, 0.ltoreq.b <1,0< a+b <1, M being one or more of Mn and Al.
Preferably, the lithium salt comprises one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalate phosphate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide.
Preferably, the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, methylethyl carbonate, methyl acetate, ethyl propionate.
Preferably, the additive comprises one or more of vinylene carbonate, vinyl ethylene carbonate, trimethylsilyl phosphate, fluoroethylene carbonate.
Compared with the prior art, the invention has the beneficial effects that: the lithium ion battery provided by the invention can generate the B-element-containing solid electrolyte membrane (CEI) on the surface of the positive electrode active material, and effectively improve the dissolution of transition metal in the active material layer, so that the deposition of the transition metal element on the surface of the negative electrode active material is reduced, the electrolyte membrane on the surface of the negative electrode active material is prevented from being damaged, the interface well of the negative electrode is maintained, and the cycle performance and the high-temperature stability of the battery are improved.
Detailed Description
The lithium ion battery comprises a battery core and electrolyte, wherein the battery core comprises a positive pole piece, a negative pole piece and an isolating film; the electrolyte comprises a solvent, lithium salt and an additive, wherein the lithium salt and the additive comprise a boron-containing compound;
The positive electrode plate comprises a positive electrode active material layer containing a positive electrode active material of cobalt element, and after the lithium ion battery is charged and discharged, a solid electrolyte interface film is formed on the surface of the positive electrode active material layer, wherein the lithium ion battery meets the following relational expression:
n＝e-(4C+f)；
n represents the mass percentage content of boron element in the solid electrolyte interface film, and the unit is wt%;
C represents the mass percentage content of cobalt element in the positive electrode active material, and the unit is wt%;
f is a relationship number ranging from 3.92 to 6.00.
The mass percentage of boron element in the electrolyte membrane on the surface of the positive electrode active material in the lithium ion battery is measured by an X-ray energy spectrometer (EDS) according to a measuring method of a micro-beam analysis scanning electron microscope energy spectrometer quantitative analysis parameter of GB/T25189-2010 and an electron probe and scanning microscope X-ray energy spectrum quantitative analysis general rule of GB/T17359.
The mass ratio of cobalt element in the positive electrode active material is obtained through ICP test of an inductively coupled plasma spectrometer. ICP is tested by measuring the content of beryllium, magnesium, aluminum, potassium, calcium, titanium, chromium, manganese, iron, cobalt, copper, zinc, molybdenum, lead, tungsten, sodium, tin, nickel and silicon by referring to YS/T833-2020 ammonium rhenate chemical analysis method through inductively coupled plasma atomic emission spectrometry.
The cobalt element can effectively prevent Li-Ni from being mixed and arranged and stabilize the crystal structure in the nickel cobalt manganese/lithium aluminate oxide positive electrode active material, thereby being capable of influencing the cycle life and the high-temperature stability. The cobalt element dissolves out along with the electrolyte in the electrochemical process, especially at high temperature, so that the stability of the positive electrode active material is deteriorated, the internal resistance is continuously increased and the capacity decay is accelerated in the continuous lithium removal/intercalation process. The B-based electrolyte additive can react preferentially on the surface of the nickel cobalt manganese/lithium aluminate oxide to generate an effective interface electrolyte membrane CEI, and effectively prevents the electrolyte from oxidizing on the surface of the nickel cobalt manganese/lithium aluminate oxide and dissolving out transition metals such as metallic cobalt element, thereby reducing the deposition of the transition metal element on the surface of the anode active material, avoiding the damage of the electrolyte membrane on the surface, and keeping the interface of the anode good, so as to improve the cycle performance and the high-temperature stability of the battery.
In some embodiments, the boron-containing compound is one or more of a boron-containing ester, a boron-containing lithium salt, and a boron-containing hydrocarbon.
Meanwhile, as the B element can be combined with F, inorganic components in CEI are effectively reduced, impedance is reduced, polarization is reduced, damage of HF to the material is inhibited, and thus dissolution of cobalt element is reduced.
A thinner interface electrolyte membrane (CEI) on the surface of the positive electrode active material layer is usually 1-4nm in thickness, and the electrolyte membrane can effectively isolate the positive electrode active material from the electrolyte, reduce the oxidation of the electrolyte on the surface of the active material and simultaneously reduce the damage of side reaction to the surface of the active material, such as corrosion of HF. Through reasonable design, a layer of compact boron-containing electrolyte film is formed on the surface of the positive electrode active material layer by using boron-containing electrolyte, and when the lithium ion battery meets n=e -(4C+f), the lithium ion battery has better high-temperature stability and longer cycle life.
In the lithium ion battery of the present invention, preferably, cobalt element in the positive electrode active material of the battery cell accounts for 1% to 27% of the total weight of the positive electrode active material; further preferably, the cobalt element in the positive electrode active material of the battery core accounts for 2% -23% of the total weight of the positive electrode active material. When the content of cobalt element is too small, the crystal structure stability of the active material is poor, and the internal resistance is large; if the content of cobalt element is too high, the cost of active substances is high, and the unit cell parameters are reduced, which is unfavorable for gram capacity of the material.
In the lithium ion battery, the positive electrode plate comprises a positive electrode current collector and a positive electrode membrane which is arranged on at least one surface of the positive electrode current collector and comprises a positive electrode active substance, a conductive agent and a binder. The kind and content of the binder used for the conductive agent are not particularly limited, and may be selected according to actual requirements. The type of the positive electrode current collector is not particularly limited, and may be selected according to practical requirements, for example, the positive electrode current collector may be an aluminum foil, a nickel foil or a polymer conductive film, and preferably the positive electrode current collector is an aluminum foil.
In some embodiments, the boron-containing compound is one or more of lithium dioxaborate, lithium difluorooxalato borate, lithium tetrafluoroborate, tris (trimethylsilane) borate, and tris (pentafluorophenyl) borane.
In some embodiments, the weight percent of boron-containing compound in the electrolyte is 0.1wt% to 15wt%.
In some embodiments, the ratio of electrolyte mass to nominal capacity is from 1.5g/Ah to 5.5g/Ah.
In some embodiments, the additive in the electrolyte contains a sulfur-containing compound. The additive containing the sulfur compound can cooperate with the restoration of the interfacial film, and the integrity of the interfacial film is improved. The sulfur-containing compound is one or more of 1, 3-propane sultone, ethylene sulfate, methyl disulfonic acid methylene ester, 1-propylene-1, 3-sultone, 4-methyl ethylene sulfate, 4-ethyl ethylene sulfate, 4-propyl ethylene sulfate, propylene sulfate, 1, 4-butane sultone, ethylene sulfite, dimethyl sulfite and diethyl sulfite.
In some embodiments, the solid electrolyte interface film comprises 0.05wt% to 1.5wt% boron. The mass percentage of boron element in the solid electrolyte interface film is 0.05wt% -0.1 wt%, 0.1wt% -0.2 wt%, 0.2wt% -0.5 wt%, 0.5wt% -0.8 wt%, 0.8wt% -1 wt% and 1wt% -1.2 wt%. Specifically, the mass percentage of boron element in the solid electrolyte interface film is 0.05wt%, 0.08wt%, 0.15wt%, 0.45wt%, 0.85wt%, 0.95wt%, 1.2wt% and 1.5wt%.
In some embodiments, the mass percentage of cobalt element in the positive electrode active material is 2wt% to 25wt%. The mass percentage of the cobalt element in the positive electrode active material is 2-8wt%, 8-10wt%, 10-15wt%, 15-20wt%, 20-25wt%, specifically, the mass percentage of the cobalt element in the positive electrode active material is 2-5wt%, 8-12wt%, 15-16wt%, 18-20wt%, 22-24wt% and 25-25wt%.
In some embodiments, the active material on the negative electrode plate is one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microsphere, silicon-based material, tin-based material and lithium titanate.
In some embodiments, the graphite is selected from artificial graphite, natural graphite or a mixture of the two, the silicon-based material can be selected from one or more of simple substance silicon, silicon oxygen compound, silicon carbon compound and silicon alloy, and the tin-based material can be selected from one or more of simple substance tin, tin oxide compound and tin alloy.
In some embodiments, the positive electrode active material includes a positive electrode active material having a chemical formula of Li 1+xCoaNibM1-a-bO2, -0.1+.x+.0.2, 0< a <1, 0+.b <1,0< a+b <1, M is one or more of Mn, al.
In some embodiments, the positive electrode active material may be selected from one or more of Li xNiaCobMcO2 (M is selected from one or both of Mn and Al, 0.95.ltoreq.x.ltoreq.1.2, 0 < a < 1,0 < b < 1,0 < c < 1, and a+b+c=1), and doping and/or cladding modifying compounds thereof, but the present application is not limited to these materials, and other conventionally known materials that can be used as positive electrode active materials may be used. These positive electrode active materials may be used alone or in combination of two or more.
In some embodiments, the membrane is one or more of a polypropylene membrane, a polyethylene membrane, a non-woven membrane, and a ceramic-modified, polyvinylidene fluoride-modified membrane.
In some embodiments, the lithium salt comprises one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalato phosphate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide.
In some embodiments, the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, methylethyl carbonate, methyl acetate, ethyl propionate. The solvent may be an organic solvent, and the organic solvent may include one or more of cyclic carbonate, chain carbonate, and carboxylate. The cyclic carbonate can be selected from one or more of ethylene carbonate, propylene carbonate, butylene carbonate and gamma-butyrolactone; the chain carbonate can be selected from one or more of dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate; the carboxylic acid ester is selected from one or more of methyl formate, ethyl formate, methyl acetate, ethyl acetate, propyl propionate, ethyl butyrate, ethyl propionate and propyl butyrate. The electrolyte contains other functional additives such as vinylene carbonate, vinyl sulfate, propane sultone, fluoroethylene carbonate, etc., but the present application is not limited to these materials, and other conventionally known materials that can be used as the electrolyte functional additives may be used.
In some embodiments, the additive includes one or more of vinylene carbonate, vinyl ethylene carbonate, trimethylsilyl phosphate, fluoroethylene carbonate.
In the lithium ion battery, the negative electrode plate comprises a negative electrode current collector and a negative electrode membrane which is arranged on at least one surface of the negative electrode current collector and comprises a negative electrode active material, a conductive agent and a binder. The kind and content of the conductive agent and the binder are not particularly limited, and may be selected according to actual requirements. The type of the negative electrode current collector is not particularly limited, and may be selected according to practical requirements, for example, the negative electrode current collector may be a copper foil, a carbon-coated copper foil or a polymer conductive film, and preferably the negative electrode current collector is a copper foil.
The negative electrode active material is one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microsphere, silicon-based material, tin-based material and lithium titanate. The graphite is selected from artificial graphite, natural graphite or a mixture of the artificial graphite and the natural graphite, the silicon-based material can be selected from one or more of simple substance silicon, silicon oxygen compound, silicon carbon compound and silicon alloy, and the tin-based material can be selected from one or more of simple substance tin, tin oxygen compound and tin alloy.
In the lithium ion battery of the present invention, the kind of the separator is not particularly limited, and any separator material used in the existing battery may be used, such as polyethylene, polypropylene, polyvinylidene fluoride, and multilayer composite films thereof, but not limited thereto.
In the lithium ion battery of the invention, the electrolyte comprises lithium salt and organic solvent, wherein the specific types and compositions of the lithium salt and the organic solvent are not particularly limited, and can be selected according to actual requirements.
The present invention will be described in further detail with reference to the following specific embodiments, but the embodiments of the present invention are not limited thereto.
Example 1
A lithium ion battery comprises a positive plate, a negative plate, an isolating film and electrolyte, wherein the capacity of the lithium ion battery is 3Ah.
The preparation method of the positive plate comprises the following steps: mixing an anode active substance, conductive carbon Super-P and a binder polyvinylidene fluoride PVDF according to a mass ratio of 97:2:1, adding a solvent N-methylpyrrolidone NMP, stirring in vacuum to obtain uniform slurry, uniformly coating the slurry on an aluminum foil according to a designed weight, and drying to obtain the anode sheet.
The preparation method of the negative plate comprises the following steps: mixing artificial graphite, conductive carbon Super-P, a binder sodium carboxymethylcellulose CMC and an aqueous binder according to a mass ratio of 96:1.5:1:1.5, adding deionized water, stirring in vacuum to obtain uniform slurry, uniformly coating the slurry on a copper foil according to a designed weight, and drying to obtain the negative plate.
Preparation of electrolyte: mixing methyl ethyl carbonate and ethylene carbonate according to a mass ratio of 7:3 to obtain an organic solvent, dissolving fully dried LiPF6 in the mixed organic solvent to prepare an electrolyte with a lithium salt concentration of 1mol/L, adding 1% of ethylene carbonate and 1% of ethylene sulfate, wherein the electrolyte is a Base electrolyte, and adding or changing the electrolytes in the follow-up examples.
And assembling the positive pole piece, the negative pole piece and the isolating film to obtain a battery core, placing the battery core in an outer packaging shell, drying, injecting 12g of the prepared electrolyte, and then carrying out procedures of packaging, standing, formation, capacity division and the like to obtain the lithium ion battery.
Performance test of lithium ion battery:
Cycle life test: the lithium ion batteries prepared in examples and comparative examples were charged at 1C rate and discharged at 1C rate at 60C, and full charge discharge cycle test was performed until the capacity of the lithium ion battery was attenuated to 80% of the initial capacity, and the number of cycles was recorded.
High-temperature stability test of lithium ion battery: and placing the fully charged lithium ion battery in an incubator for 7 days, controlling the temperature at 70+/-2 ℃, and testing the volumes V1 and V2 before and after primary lithium ion battery storage, wherein the volume expansion rate is 1-V2/V1. The boron-containing additive was added to the electrolyte based on example 1, and the positive electrode active materials with different cobalt contents were used, so that the preparation mode and capacity design were consistent, the test method and conditions were consistent with example 1, and the differences between comparative example 1 and examples 2 to 10 and the test results were recorded in table 1.
TABLE 1
As can be seen from the above table 1, when the boron-containing additive is added to the electrolyte and the positive electrode active materials with different cobalt contents are used, the prepared lithium ion battery has good high temperature stability, is not easy to generate gas under the high temperature condition, and has good cycle performance. And as shown by comparison of examples 2-10, when the electrolyte composition is set to be Base+1% LiDFOB and the boron element content in CEI is 0.33wt%, and the cobalt element content in the positive electrode is 13wt%, the obtained lithium ion battery has lower expansion rate and higher cycle life, and the volume expansion rate of 7 days stored at 70 ℃ is only 15%, and the cycle life at 60 ℃ is 892 circles. The volume expansion reaction is that the high temperature is generated quickly, which represents the quality of the high temperature stability of the battery, and the smaller the volume expansion rate is, the better the high temperature stability of the battery is.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the invention pertains from the foregoing disclosure and teachings. Therefore, the present invention is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (12)
1. The lithium ion battery comprises an electric core and electrolyte, and is characterized in that the electric core comprises a positive pole piece, an isolating film and a negative pole piece; the electrolyte comprises a solvent, lithium salt and an additive, wherein the lithium salt and the additive comprise a boron-containing compound;
The positive electrode plate comprises a positive electrode active material layer containing a positive electrode active material of cobalt element, the surface of the positive electrode active material layer forms a solid electrolyte interface film after the lithium ion battery is charged and discharged,
Wherein, the lithium ion battery satisfies the following relation:
n=e-(4C+f) ；
n represents the mass percentage content of boron element in the solid electrolyte interface film, and the unit is wt%;
C represents the mass percentage content of cobalt element in the positive electrode active material, and the unit is wt%;
f is a relationship number ranging from 3.92 to 6.00;
the mass percentage of cobalt element in the positive electrode active material is 2 wt-25 wt%.
2. The lithium ion battery of claim 1, wherein the boron-containing compound is one or more of a boron-containing ester, a boron-containing lithium salt, and a boron-containing alkane.
3. The lithium ion battery of claim 2, wherein the boron-containing compound is one or more of lithium dioxaborate, lithium difluorooxalato borate, lithium tetrafluoroborate, tris (trimethylsilane) borate, and tris (pentafluorophenyl) borane.
4. The lithium ion battery of claim 2, wherein the weight percentage of the boron-containing compound in the electrolyte is 0.1-15 wt%.
5. The lithium ion battery of claim 1, wherein the ratio of electrolyte mass to nominal capacity is 1.5g/Ah to 5.5g/Ah.
6. The lithium ion battery of claim 1, wherein the additive in the electrolyte comprises a sulfur-containing compound.
7. The lithium ion battery according to claim 1, wherein the mass percentage of the boron element in the solid electrolyte interface film is 0.05wt% to 1.5wt%.
8. The lithium ion battery of claim 1, wherein the active material on the negative electrode plate is one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microsphere, silicon-based material, tin-based material, and lithium titanate.
9. The lithium ion battery according to claim 1, wherein the positive electrode active material comprises a positive electrode active material having a chemical formula of Li 1+xCOaNibM1-a-bO2, -0.1 r.ltoreq.x.ltoreq.0.2, 0< a <1,0 r.ltoreq.b <1,0< a+b <1, m being one or more of Mn, al.
10. The lithium ion battery of any of claims 1-9, wherein the lithium salt comprises one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluorooxalato phosphate, lithium difluorosulfonimide, lithium bistrifluoromethanesulfonimide.
11. The lithium ion battery of any of claims 1-9, wherein the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, methylethyl carbonate, methyl acetate, ethyl propionate.
12. The lithium ion battery of any of claims 1-9, wherein the additive comprises one or more of vinylene carbonate, vinyl ethylene carbonate, trimethylsilyl phosphate, fluoroethylene carbonate.
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| CN1581543A (en) * | 2003-08-15 | 2005-02-16 | 比亚迪股份有限公司 | Anode active material for non-aqueous secondary cell, and its preparing method and non-aqueous secondary cell using same |
| CN113078354A (en) * | 2021-02-07 | 2021-07-06 | 东莞市杉杉电池材料有限公司 | Ternary lithium ion battery non-aqueous electrolyte and lithium ion battery thereof |
| CN114551826A (en) * | 2022-01-18 | 2022-05-27 | 惠州锂威新能源科技有限公司 | Coating modified lithium cobaltate material and preparation method thereof, positive plate and lithium ion battery |
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