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Lithium ion battery surface clad anode material and preparation method thereof

A lithium-ion battery, surface coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low voltage platform, unstable structure, poor high temperature performance, etc., and achieve improved cycle performance and safety performance. Effect

Active Publication Date: 2010-07-14
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned cathode active materials have their own disadvantages: LiCoO 2 The charging voltage cannot exceed 4.2V, LiNiO 2 The structure is unstable, LiMn 2 o 4 The high temperature performance is not good, LiNiCoMnO 2 The voltage platform of the positive electrode is low, so these positive electrode active materials need to be modified, and the surface coating treatment of the positive electrode active material is one of the most effective modification methods: a small amount of oxide is deposited on the surface of the positive electrode active material, It can effectively improve the structural stability of the positive electrode active material without losing the specific capacity of the material, and prevent the side reaction between the positive electrode active material and the electrolyte, so it can improve the energy density, safety performance and charge-discharge cycle stability of the lithium-ion battery
However, when the surface-coated positive electrode material is prepared according to the above method, the coating material cannot be uniformly coated on the surface of the positive electrode active material, which affects the energy density, safety performance and charge-discharge cycle stability of the lithium-ion battery.

Method used

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  • Lithium ion battery surface clad anode material and preparation method thereof
  • Lithium ion battery surface clad anode material and preparation method thereof
  • Lithium ion battery surface clad anode material and preparation method thereof

Examples

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example 1

[0044] Weigh 34.5g K 2 ZrF 6 Dissolve in 2kg of deionized water, stir to fully hydrolyze at room temperature; then, add 500g of LiCoO under stirring 2 After stirring, add dropwise 2M ammonia water to adjust the pH of the mixture to 7, and continue to stir for 5 hours; then, stop stirring and filter, wash with deionized water, and dry at 85°C; finally, the dried mixture It is calcined at 1000° C. for 2 hours and slowly cooled to room temperature to obtain a surface-coated positive electrode material with a coating amount of 3%.

[0045] The surface-coated positive electrode material prepared according to the aforementioned method is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to prepare a positive electrode slurry, which is coated on the positive electrode current collector to form the positive electrode, and the lithium sheet is used as the negative electrode in the glove box It is composed of button batteries and subjected to electrochemical testing....

example 2

[0047] Weigh 55g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 4kg deionized water, stirred at room temperature to make it fully hydrolyzed; then, 500g LiCoO was added under stirring conditions 2 After stirring, add dropwise 2M ammonia water to adjust the pH value of the mixture to 8, and continue stirring for 5 hours; then, stop stirring and filter, wash with deionized water, and dry at 85°C; finally, the dried mixture It is calcined at 600° C. for 2 hours and slowly cooled to room temperature to obtain a surface-coated positive electrode material with a coating amount of 3%.

[0048] The surface-coated positive electrode material prepared according to the foregoing method is uniformly mixed with conductive carbon and PVDF to prepare a positive electrode slurry, which is coated on the positive electrode current collector to form the positive electrode, and the lithium sheet is used as the negative electrode to form a button cell in a glove box. Conduct an electrochemical test. image 3 Li...

example 3

[0050] Weigh 36g of dimethyl titanate and dissolve it in 500g of ethanol, stir at room temperature to make it fully hydrolyzed; then, add 500g of LiNi under stirring conditions 0.8 Co 0.2 O 2 , Adjust the pH to 11 and stir evenly for 5 hours; then, stop stirring and filter, wash with ethanol, and dry at 90°C; finally, the dried mixture is calcined at 500°C for 5 hours and slowly cooled to room temperature to obtain the coating 3% of the surface is coated with positive electrode material.

[0051] The surface-coated positive electrode material prepared according to the foregoing method is uniformly mixed with conductive carbon and PVDF to prepare a positive electrode slurry, which is coated on the positive electrode current collector to form the positive electrode, and the lithium sheet is used as the negative electrode to form a button cell in a glove box. Conduct an electrochemical test. Figure 4 LiNi 0.8 Co 0.2 O 2 Coated TiO 2 Before and after, in the range of 3.0-4.3V, the sp...

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Abstract

The invention discloses a method for preparing a lithium ion battery surface clad anode material, which comprises the following steps of: (1) adding one or more salt compounds containing clad metal M into a solvent A for hydrolysis to obtain a hydrolysate; (2) throwing a lithium-containing anode active material into the hydrolysate, fully stirring the mixture, regulating pH value, and making a hydrolysis product M(OH)2n deposited and uniformly adsorbed on the surface of the lithium-containing anode active material; (3) drying the lithium-containing anode active material adsorbed with the hydrolysis product M(OH)2n; and (4) roasting the dried lithium-containing anode active material of which the surface is adsorbed with the hydrolysis product M(OH)2n to form the anode active material clad by a metallic oxide MOn. The lithium ion battery surface clad anode material prepared by the method can obviously improve the energy density, safety performance and charge-discharge cycle stability of a lithium ion battery. In addition, the invention also discloses the lithium ion battery surface clad anode material prepared by the method and the lithium ion battery using the material.

Description

Technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery surface-coated positive electrode material and a preparation method thereof. Background technique [0002] With the increasing miniaturization and thinning of mobile devices such as mobile phones, digital cameras, notebook computers, and portable DVDs, the market has continuously improved the energy density, safety performance and cycle life of lithium-ion batteries. [0003] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator between the positive and negative electrodes, and an electrolyte. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material distributed on the positive electrode current collector. It includes a negative current collector and a negative active material distributed on the negative current collector. At present, the commonly used cathode...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/62H01M4/131H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 柳娜吴梦尧徐磊敏李路许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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