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Preparation method of lithium-ion battery anode material with oxide coated on surface

A lithium-ion battery, surface coating technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor safety, unguaranteed product consistency, unfavorable cost performance of lithium-ion batteries, etc., to achieve cycle performance and safety The effect of performance improvement

Active Publication Date: 2010-09-15
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above cathode materials have their own disadvantages: LiCoO 2 When the charging voltage exceeds 4.2V, the structure is unstable and the safety becomes poor; LiNiCoO 2 The structure of LiMn is unstable and has strong oxidizing property to the electrolyte; LiMn 2 o 4 The high temperature performance is not good; LiNiCoMnO 2 The structure is unstable, and the high temperature storage performance is not good
However, the process of the above method is difficult to control, and the resulting product consistency cannot be guaranteed
As another example, the Chinese invention patent application CN200510034893.2 uses organosol method to treat LiCoO 2 Surface coating, although a positive electrode material with a uniform surface coating can be obtained, the process control is complicated and the materials such as phthalate ester and silicate used are expensive, which is not conducive to improving the cost performance of lithium-ion batteries

Method used

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  • Preparation method of lithium-ion battery anode material with oxide coated on surface
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  • Preparation method of lithium-ion battery anode material with oxide coated on surface

Examples

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Effect test

Embodiment 1

[0038] At 25°C, weigh 1.28g NH 4 HCO 3 , add 500ml of water and stir to dissolve to form a solution; weigh 1.31g of AlCl 3 ·6H 2 O was added to the above solution and stirred for 5 minutes to form a transparent sol; 100g LiCoO 2 Add the powder into the sol, stir evenly, raise the temperature to 60°C and react at 60°C for 4 hours, let stand, remove the supernatant to obtain the sediment; dry the obtained sediment at 80°C, and then in Calcined at 800°C for 4 hours to obtain Al 2 o 3 The coating amount is 0.5% of the positive electrode material.

[0039] The surface coating Al prepared according to the aforementioned preparation method 2 o 3 LiCoO 2 The positive electrode material is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to make a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode. With a lithium sheet as the negative electrode, a button battery is formed in a glove box for ele...

Embodiment 2

[0041] At 25°C, weigh 1.63g NaHCO 3 , add in the mixture of 300ml water and acetone (volume ratio is 1: 1) and stir to make it dissolve, form solution; Weigh 3g TiOSO 4 ·8H 2 O was added to the above solution and stirred for 15 minutes to form a transparent sol; 100g LiNi 0.5 co 0.2 mn 0.3 o 2 Add the powder into the sol, stir evenly, raise the temperature to 35°C and react at 35°C for 4 hours, let stand, remove the supernatant to obtain the sediment; dry the obtained sediment at 70°C, and then in Calcined at 500°C for 3 hours to obtain TiO 2 The coating amount is 0.8% of the positive electrode material.

[0042] The surface-coated TiO prepared according to the aforementioned preparation method 2 LiNi 0.5 co 0.2 mn 0.3 o 2 The positive electrode material is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to make a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode. With a lithium s...

Embodiment 3

[0044] At 25°C, weigh 0.97g NaOH, add it into 200ml ethanol and stir to dissolve it to form a solution; weigh 3.48g Zr(NO 3 ) 4 ·5H 2 O was added to the above solution and stirred for 10 minutes to form a transparent sol; 100g LiNi 0.8 co 0.2 o 2 Add the powder into the sol, stir evenly, raise the temperature to 40°C and react at 40°C for 2 hours, let stand, remove the supernatant to obtain the sediment; dry the obtained sediment at 80°C, and then in Calcined at 400°C for 3 hours to obtain ZrO 2 The coating amount is 1% positive electrode material.

[0045] The surface-coated ZrO prepared according to the aforementioned preparation method 2 LiNi 0.8 co 0.2 o 2 The positive electrode material is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to make a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode. With a lithium sheet as the negative electrode, a button battery is formed in a gl...

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Abstract

The invention discloses a preparation method of a lithium-ion battery anode material with an oxide coated on the surface, which comprises the following steps of: 1. dissolving an alkaline substance in a solvent to form a solution, and adding soluble salt into the solution under the condition of stirring to form sol; 2. adding a lithium-contained anode material into the sol and stirring to enable a hydrolysate to be uniformly precipitated and adsorbed on the surface of the lithium-contained anode material; 3. drying the lithium-contained anode material with the hydrolysate adsorbed on the surface; and 4. roasting the dried lithium-contained anode material to form the lithium-contained anode material with the oxide coated on the surface. The invention has simple and realizable preparation method, and the energy density, the safety performance and the charge and discharge cyclical stability of a lithium-ion battery can be markedly improved through the lithium-contained anode material with the oxide coated on the surface, which is prepared by the preparation method.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a positive electrode material of a lithium ion battery whose surface is coated with an oxide. Background technique [0002] With the increasing miniaturization and thinning of portable electronic devices such as mobile phones, digital cameras, and notebook computers, the market's requirements for the energy density, safety performance, and cycle life of lithium-ion batteries continue to increase. [0003] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive electrode collector and a positive electrode material distributed on the positive electrode collector, and the negative electrode sheet includes The negative electrode collector and the negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131
CPCY02E60/122Y02E60/10
Inventor 徐磊敏柳娜吴梦尧许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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