Anode material of lithium ion cell and preparation method

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve the problems of reducing the cycle performance of positive electrode materials, decreasing the thermal stability and safety of batteries, and generating oxygen, etc., and achieving good high-rate discharge Performance, good anti-overcharge performance, good high temperature performance

Inactive Publication Date: 2005-06-15
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the lithium-ion battery is repeatedly charged and discharged, especially when it is charged to a high voltage above 4.2V, the above-mentioned positive electrode active material is prone to lattice deformation and decomposition, and oxygen is generated. Oxidative decomposition of liquid, battery thermal stability and safety decrease
[0004] Trace amounts of water in the non-aqueous electrolyte used in lithium-ion batteries will also react with lithium salts such as LiPF6 in the electrolyte to produce HF acid, which will react with the positive active material in the battery, resulting in The crystal structure of the material is destroyed, thus reducing the cycle performance of the cathode material, especially at high temperatures
[0005] In addition, during the charging and discharging process of lithium-ion batteries, since the diffusion rate of lithium ions in the unit cell of the positive electrode material is significantly lower than that in the electrolyte, the concentration of lithium ions on the surface of the positive electrode material in contact with the electrolyte is different. Very large, and the ionic conductivity is also low, so it is easy to

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  • Anode material of lithium ion cell and preparation method
  • Anode material of lithium ion cell and preparation method
  • Anode material of lithium ion cell and preparation method

Examples

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Example Embodiment

[0030] The method for preparing the positive electrode material of the lithium ion battery of the present invention is prepared by a liquid phase method. The additive forms an oxide coating layer on the surface of the positive electrode active material after heat treatment, so that the structure of the positive electrode active material changes relatively little during the charge and discharge process. The positive electrode active material can be lithium cobalt oxide LiCoO 2 , Lithium nickel cobalt oxygen LiNi 1-X Co X O 2 (01 / 3 Co 1 / 3 Mn 1 / 3 O 2 , Lithium manganate LiMn 2 O 4 At least one of them, the average particle size is 4-12 microns, preferably 10-12 microns, because the larger the particle size, the more obvious the additive effect. If the particle size of the positive electrode active material is too small, it is easy to form a blend with the additives instead of forming a uniform coating layer on the surface of the positive electrode active material, and the oxide obtai...

Example Embodiment

[0035] [Example 1]

[0036] Preparation of cathode material: Li / Co molar ratio 1:1~1.1 2 CO 3 And Co 3 O 4 Mix uniformly, heat treatment at 900°C for 10 hours to obtain lithium cobalt oxide with an average particle size of 10-12 microns. Aluminum nitrate with aluminum weight accounting for 0.1% by weight of lithium cobaltate is dissolved in absolute ethanol, lithium cobaltate is added, mixed uniformly, the solvent is evaporated, and then heat treated at 800°C for 4 hours to obtain the positive electrode material of the present invention.

[0037] Preparation of the positive electrode sheet: 85% by weight of the obtained positive electrode material, 10% by weight of graphite as a conductive agent and 5% by weight of PVDF (polyvinylidene fluoride) as a binder are added to the NMP (methyl-2-pyrrolidinone) solvent together, It is fully stirred into a paste to obtain a positive electrode material slurry mixture. The slurry is uniformly coated on both sides of the strip-shaped aluminum ...

Example Embodiment

[0041] [Example 2]

[0042] Except for the addition of aluminum in aluminum nitrate to 5% by weight of lithium cobaltate, the rest is

[0043] Example 1 is the same.

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Abstract

The anode material is prepared from oxidation material layer of covering surface of at least one anode active material among LiCoO2, LiNi1-xCOxO2, LiNi1/3Mn1/3O2 and LiMn2O4. Weight of non-oxygen element in oxidation material layer can be 0.01-10 weight% of anode active material. Advantages of the anode material are: good cycle performance, favorable high temp property and high power discharge property, and anti over change property as well as simple technique and easy of production.

Description

【Technical field】 [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium ion battery cathode material with good cycle performance and good high temperature performance and a preparation method thereof. 【Background technique】 [0002] As the functions of electrical products, especially portable electrical products, are becoming more and more complex, and the volume is becoming smaller and smaller, the requirements for the power supply are also increasing, which is reflected in: higher capacity, suitable cycle life, good high temperature performance, good high rate Discharge performance and anti-overcharge performance, etc. Lithium-ion batteries have developed rapidly and are widely used in the past ten years due to their superior comprehensive performance. [0003] In lithium-ion batteries, the performance of the cathode material has a direct impact on the performance of the lithium-ion battery. At ...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01G1/02H01M4/02H01M4/04H01M4/36H01M4/48H01M4/50H01M4/52H01M4/58
CPCC01G45/1228C01G45/1242C01G51/42C01G51/50C01G53/50C01P2002/72C01P2002/76C01P2004/03C01P2006/40C01P2006/80H01M4/02H01M4/0471H01M4/1391H01M4/362H01M4/485H01M4/505H01M4/525H01M2004/021Y02E60/10
Inventor 刘会权周信鹰
Owner BYD CO LTD
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