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Preparation method of cathode material of lithium ion battery coated with metal oxides on surface

A lithium-ion battery, surface coating technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of high price, poor safety, and unguaranteed product consistency, and achieve simple preparation methods, cycle performance and safety The effect of performance improvement

Inactive Publication Date: 2011-01-19
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 oxidation 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 CN 200510034893.2 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 cathode material of lithium ion battery coated with metal oxides on surface
  • Preparation method of cathode material of lithium ion battery coated with metal oxides on surface
  • Preparation method of cathode material of lithium ion battery coated with metal oxides on surface

Examples

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Effect test

Embodiment 1

[0039] Weigh 10g MgCl 2 ·6H 2 O was dissolved in a mixture of 200ml 50°C water and acetone (volume ratio 2:1); add 5M ammonia water and stir to adjust the pH value to 3.2 to form a sol-like substance; add 100g LiCoO 2 Powder and stir evenly, react for 3 hours, stand still, remove the supernatant, and dry the obtained sediment at 70°C; bake the dried sediment at 850°C for 4 hours, and obtain the MgO coating amount of 2% cathode material LiCoO 2 .

[0040] The surface-coated MgO positive electrode material LiCoO prepared according to the aforementioned method 2 It is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to prepare a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode sheet, and a lithium sheet is used as a negative electrode sheet to form a button battery in a glove box for electrochemical test. figure 1 for LiCoO 2 SEM images before and after the surface is coated with MgO. It ...

Embodiment 2

[0042] Weigh 22.1g Al(NO 3 ) 3 9H 2 Dissolve O in 500ml of water at 90°C to form a solution; add 5M ammonia water to adjust the pH value to 4.5 to form a sol-like substance; add 100g LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Powder and stir evenly, react for 6 hours, stand still, remove the supernatant, and dry the obtained sediment at 90°C; bake the dried sediment at 650°C for 3 hours to obtain Al 2 o 3 The positive electrode material LiNi with coating amount of 3% 1 / 3 co 1 / 3 mn 1 / 3 o 2 .

[0043] The surface coating Al obtained by the aforementioned method 2 o 3 Cathode material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 It is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to prepare a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode sheet, and a lithium sheet is used as a negative electrode sheet to form a button battery in a glove box for electrochemical test. image 3 for LiNi 1 / 3 co 1 / 3 mn 1 / 3...

Embodiment 3

[0045] Weigh 9.5g TiOSO 4 ·8H 2 Dissolve O in 300ml ethanol at 40°C to form a solution; add 5M ammonia water to adjust the pH value to 4 to form a sol-like substance; add 100g LiNi 0.8 co 0.2 o 2 Powder and stir evenly, react for 3 hours, stand still, remove the supernatant, and dry the obtained sediment at 80°C; bake the dried sediment at 500°C for 3 hours to obtain TiO 2 Cathode material LiNi with coating amount of 2.5% 0.8 co 0.2 o 2 .

[0046] The surface-coated TiO prepared according to the aforementioned method 2 Cathode material LiNi 0.8 co 0.2 o 2 It is uniformly mixed with conductive carbon and polyvinylidene fluoride (PVDF) to prepare a positive electrode slurry, and coated on the positive electrode current collector to form a positive electrode sheet, and a lithium sheet is used as a negative electrode sheet to form a button battery in a glove box for electrochemical test. Figure 4 LiNi shown 0.8 co 0.2 o 2 Surface coated TiO 2 Before and after, in ...

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Abstract

The invention discloses a preparation method of a cathode material of a lithium ion battery coated with metal oxides on the surface, which comprises the following steps of: 1, dissolving an easily soluble metal salt into a solvent to form a solution under the heating condition; 2, adjusting the pH value of the solution in the step 1 with an alkali solution under the stirring condition to ensure that the solution forms a sol matter; 3, putting a lithium-containing cathode material into the sol matter under the stirring condition, reacting for a period of time to ensure that hydrolysate evenly deposits and absorbs on the surface of the lithium-containing cathode material; 4, drying the lithium-containing cathode material absorbed with the hydrolysate on the surface; and 5, roasting the dried lithium-containing cathode material to form the lithium-containing cathode material coated with the metal oxides on the surface. The preparation method is easy and reliable; and the lithium-containing cathode material coated with the metal oxides on the surface can remarkably improve the energy density, the safety and the charge and discharge circulating stability of the lithium ion battery.

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 a metal 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 electrode sheet and the negative electrode sheet, 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 It includes a negative electrode current collector ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 柳娜徐磊敏吴梦尧许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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