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Lithium ion battery, active cathode material and preparation methods thereof

A cathode active material, lithium-ion battery technology, applied in battery electrodes, electrolyte battery manufacturing, secondary batteries and other directions, can solve the problems of high interface impedance, poor electronic conductivity, etc., to achieve easy process, simple method, good conductivity. Effect

Active Publication Date: 2011-11-09
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electronic conductivity of oxides is relatively poor, so the positive electrode coated with this type of material tends to have higher interfacial impedance than that without coating

Method used

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  • Lithium ion battery, active cathode material and preparation methods thereof
  • Lithium ion battery, active cathode material and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Make 100 pieces of 423450A lithium-ion batteries, the specific preparation steps are as follows.

[0018] 1) Positive electrode ingredients.

[0019] Firstly, the positive electrode active material is prepared, the coating solution is mixed with the positive electrode active material by a spray dispersion method, the mixture is dried after washing, and then sintering heat treatment is carried out at 400-600° C. in an inert gas atmosphere. Specifically include the following steps:

[0020] 01) The positive electrode active material LiCoO with a particle size D50 of 9 μm to 20 μm 2 Put the particles into the spray fluidized bed dryer, turn on the induced draft fan and blower, observe the fluidization of the seed crystals in the fluidized bed, and adjust the air speed to ensure that the particles in the fluidized bed are well fluidized. Turn on the electric heater to heat the fluidized LiCoO 2 particles.

[0021] 02) Glucose solution with a mass specific concentration ...

Embodiment 2

[0051] Prepare 100 models of 423450A lithium-ion batteries. The difference between the preparation steps and Example 1 is that in step 1) positive electrode ingredients, in step 02) when preparing the positive electrode active material, a glucose solution with a mass ratio concentration of 20% and mass Al(OH) with a specific concentration of 10% 3 The solutions were mixed to make a coating solution, and other steps and formulations were the same as in Example 1.

[0052] The charging and discharging, cycle, overcharge test and high temperature storage performance test conditions and methods of the battery are the same as in Example 1. The test results are shown in Table 1 and Table 2.

Embodiment 3

[0054] Prepare 100 models of 423450A lithium-ion batteries. The difference between the preparation steps and Example 1 is that in step 1) positive electrode ingredients, in step 02) when preparing the positive electrode active material, a glucose solution with a mass ratio concentration of 20% and mass Al(OH) with a specific concentration of 5% 3 The solutions were mixed to make a coating solution, and other steps and formulations were the same as in Example 1.

[0055] The charging and discharging, cycle, overcharge test and high temperature storage performance test conditions and methods of the battery are the same as in Example 1. The test results are shown in Table 1 and Table 2.

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Abstract

The invention discloses a lithium ion battery, an active cathode material thereof and preparation methods for the lithium ion battery and the active cathode material. The active cathode material comprises active cathode substances and a surface coating film, wherein the surface coating film comprises the components of carbon and metallic or non-metallic oxides. The stability and security of the active cathode material provided by the invention can be improved, and simultaneously, the high electric conductivity of the active cathode material is maintained. The battery has high stability at high temperature, and can effectively reduce the potential safety hazards of a battery core such as case bulging, leakage, explosion and the like. The methods provided by the invention are simple and easy to industrially popularize and apply, and are implemented by manufacturing procedures easy to control.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion battery and its positive electrode active material, as well as a preparation method of the positive electrode active material and the lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They are widely used in various electronic products such as mobile phones, mobile phones, cameras, and notebook computers. Among them, the performance of the positive electrode material has a direct impact on the performance of the lithium-ion battery. The commercial battery positive electrode material is based on LiCoO 2 Mainly. In practical applications, the positive electrode material is in direct contact with the electrolyte, and the interaction between them will cause the deterioration of the chemical properties o...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/525H01M10/0525H01M10/058
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50
Inventor 饶汝宇何伟王小龙杨小玲何名龙凤
Owner SHENZHEN BAK POWER BATTERY CO LTD
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