Lithium ion battery anode material and producing method thereof

A technology for lithium ion battery and positive electrode material, which is applied in the field of positive electrode material for lithium ion battery and its preparation, can solve the problems such as the deterioration of pulping and coating processing performance of the positive electrode material, the reduction of the specific capacity of the positive electrode material, and the poor conductivity, etc. Electrochemical performance, maintenance of processability, cost reduction effect

Active Publication Date: 2006-05-17
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems are often encountered in the research on the surface coating of positive electrode material substrate particles: (1) some coating materials have poor conductivity, which often reduces the specific capacity of the coated positive electrode material; (2) some coating materials It has good electrical conductivity, but after coating, the slurrying and coating processing performance of the positive electrode material is seriously deteriorated
Although Chinese patent applications CN1414650A, CN1280397A, CN1346160A, CN1357932A, CN1366363A, CN1379488A and CN1416189A have proposed a variety of lithium-ion battery cathode materials with coating layers, they have not proposed technical means to solve the above problems

Method used

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  • Lithium ion battery anode material and producing method thereof
  • Lithium ion battery anode material and producing method thereof
  • Lithium ion battery anode material and producing method thereof

Examples

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Effect test

Embodiment 1

[0019]Add 5 liters of ammonia water with a concentration of 0.4mol / L (mol / liter) into a 40-liter reactor. After the temperature of the kettle reaches the predetermined temperature of 60°C, start the impeller agitator to make its speed 400RPM. Calculate the pH value of ammonia water. Then, a mixed salt solution with a concentration of 2.0mol / L is introduced from the first high-level tank through a rotameter, and the salt solution is composed of an aqueous solution of nickel sulfate, cobalt sulfate and aluminum sulfate in a fixed ratio, wherein the atomic ratio of each metal element salt It is Ni: Co: Al=0.75: 0.1: 0.15. At the same time, NaOH and ammonia water containing 4.0 mol / L and 0.8 mol / L are fed through another rotameter from the second high position tank in parallel flow lye, so that the pH value of the mixture in the kettle is always maintained at 11.00±0.10. After the addition of the ingredients was completed, the stirring was continued for 2 hours. Then the resulti...

Embodiment 2

[0023] The precursor mixed hydroxide is prepared in the same way as in Example 1, except that the precursor mixed hydroxide in this example contains the third doping element Mn, and its composition is Ni 0.75 co 0.10 Al 0.10 mn 0.05 (OH) 2 , and during co-precipitation, the pH value was 11.5±0.05. Also according to the method of Example 1, mix the precursor mixed hydroxide with LiOH·H 2 O is mixed and calcined together. The difference is that the molar ratio of the ingredients in this example is: 1:1.07, and the resulting product LiNi 0.75 co 0.10 Al 0.10 mn 0.05 o 2 Also black powder.

[0024] In this example, the coating process of the positive electrode material substrate particles is as follows:

[0025] First, the preparation of LiOH·H 2 O / H 3 BO 3 =1.1 / 1 (molar ratio) of 2% solution (abbreviated as liquid A), the preparation concentration is 2% polyethylene oxide (PEO) solution (abbreviated as liquid B) with a molecular weight of 250,000. Then, 100 g of dri...

Embodiment 3

[0028] Synthesize LiNi by the method for embodiment 2 0.75 co 0.10 Al 0.10 mn 0.05 o 2 Positive electrode material base material. The difference is that in this example, LiF·Li 3 PO 4 Fast ion glass instead of Li 2 O·B 2 o 3 as coating material. The synergistic coated polymer solution uses 2% PVA solution with a molecular weight of 100,000, and the coated positive electrode active material has good processability and electrochemical performance.

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Abstract

A lithium cell positive electrode material consists of base material of LiNi1-x-y CoxMyO2 and cladding material of oxide nanofilm. Its preparing method includes coprecipitating Ni salt, Co salt and salt aqueous solution of at least one third metal element by alkali liquid to prepare presoma of mixed hydroxide, sintering mixed hydroxide with compound with Li to prepare positive electrode base material in particle type, coating a cladding material of nanofilm on particle surface of base material.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery, commonly known as "lithium battery", is currently the best comprehensive rechargeable battery. It uses graphitized carbon material as negative electrode, lithium-containing transition metal oxide as positive electrode, and lithium salt / carbonate mixture solution as electrolyte. Due to its high working voltage, high capacity density, long cycle life, no memory effect, and environmental friendliness, lithium-ion batteries have been widely used in mobile phones, portable computers, PDAs (personal digital assistants), cameras, digital Cameras, aerospace technology and other fields. LiCoO 2 (Lithium cobalt oxide) is currently the main commercial lithium-ion battery cathode material, but due to the lack of cobalt resources and high price, the wider application of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/02H01M4/04H01M4/48H01M4/62
CPCY02E60/10
Inventor 林云青陈泽伟曾鹏程
Owner SHENZHEN BAK POWER BATTERY CO LTD
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