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Anode active material composition of lithium ion secondary battery and battery

A positive electrode active material and secondary battery technology, which is applied in the direction of secondary batteries, active material electrodes, battery electrodes, etc., can solve the problems of hindering the large-scale application of materials, poor high-rate charge and discharge performance, and low volume-specific capacity. Excellent safety performance, good high temperature performance and cycle performance, and good storage performance

Active Publication Date: 2008-10-29
SHENZHEN BAK POWER BATTERY CO LTD
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AI Technical Summary

Problems solved by technology

However, lithium iron phosphate has two obvious disadvantages. One is low conductivity, which leads to poor high-rate charge and discharge performance and low actual specific capacity; the other is low bulk density, which leads to low volume specific capacity.
These two disadvantages hinder the large-scale application of this material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First take the chemical formula as LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The ternary cathode material with the chemical formula LiFePO 4 The olivine-type lithium iron phosphate, the mass ratio of the two is 9:1, and the two are mixed as the positive electrode active material. With PVDF as the binder, its mass is 4% of the mass of the positive active material, with acetylene black as the conductive agent, its mass is 2% of the mass of the positive active material, with NMP as the solvent, its mass is 50% of the mass of the positive active material %. The positive electrode active material, binder, acetylene black and NMP were mixed and stirred at a speed of 6000 rpm for 5 hours to make them uniformly dispersed. After coating, drying, tableting and other processes, the positive electrode sheet material is obtained. Among them, the three processes of mixing, coating and drying need to be carried out in a vacuum environment, and the positive electrode sheet material obtained aft...

Embodiment 2

[0036] In this embodiment, the chemical formula is LiNi 0.1 mn 0.1 co 0.8 o 2 The ternary cathode material and crystal structure are olivine-type LiFe 0.2 mn 0.8 PO 4 The mixture is used as the positive electrode active material, and the mass ratio of the two is 1:9. The ratio of other auxiliary materials and the preparation process of the positive electrode sheet, the negative electrode sheet and the lithium-ion battery are the same as in Example 1.

Embodiment 3

[0038] In this embodiment, the chemical formula is LiNi 0.4 mn 0.2 co 0.4 o 2 The ternary cathode material and crystal structure are olivine-type LiFe 0.8 Mg 0.2 PO 4 The mixture is used as the positive electrode active material, and the mass ratio of the two is 4:6. The ratio of other auxiliary materials and the preparation process of the positive electrode sheet, the negative electrode sheet and the lithium-ion battery are the same as in Example 1.

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Abstract

The invention relates to a positive active material combination for a lithium ion secondary battery and a lithium ion secondary battery containing the combination. The combination essentially consists of an olivine-typed lithium iron phosphate and a ternary cathode material. The olivine-typed lithium iron phosphate and the ternary cathode material are mixed as the positive active material of the lithium ion secondary battery to ensure that the lithium ion secondary battery of the invention has outstanding high temperature stability, excellent high current cycling capacity holdover performance and excellent safety, thus removing various disadvantages of the lithium ion secondary battery produced by a positive active material which only adopts olivine-typed lithium iron phosphate or the ternary cathode material. The invention can be widely applied to the preparation field of the lithium ion secondary battery, especially power batteries.

Description

【Technical field】 [0001] The invention relates to a positive electrode active material for a lithium ion secondary battery, in particular to a positive electrode active material composition for a lithium ion secondary battery and a battery using the positive electrode active material composition. 【Background technique】 [0002] Lithium-ion batteries are a new generation of green batteries, and are considered to be high-tech products that are of great significance to the national economy and people's lives in the 21st century. Lithium-ion batteries have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. As a high-energy chemical power source, it has been widely used in mobile phones, notebook computers, UPS, Camcorders, various portable electric tools, electronic instruments, weapons and equipment, etc. are also the preferred supporting power sources for electric vehi...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/36H01M10/38H01M10/40H01M4/136H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 张拥乱张建文郑荣鹏
Owner SHENZHEN BAK POWER BATTERY CO LTD
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