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Positive pole material of nonaqueous secondary cell and producing method thereof

A non-aqueous secondary battery and positive electrode material technology, applied in secondary batteries, non-aqueous electrolyte storage batteries, electrode manufacturing, etc., to achieve the effect of improving thermal stability

Active Publication Date: 2004-11-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To LiNi 1-x co x o 2 The coating of metal ions by the material can improve the thermal stability, rate characteristics and overcharge resistance of the material, but this is at the expense of the specific discharge capacity of the material.

Method used

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  • Positive pole material of nonaqueous secondary cell and producing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Lithium acetate and cobalt acetate were mixed and dissolved in deionized water at a molar ratio of Li:Co=1.01:1, and then acrylic acid was added as a chelating agent, wherein the molar ratio of acrylic acid:(Li+Co)=2:1. At 80°C, slowly add the LiNi prepared in the comparative example under stirring 0.8 co 0.2 o 2 material, finally making the molar ratio LiNi 0.8 co 0.2 o 2 : LiCoO 2 =1:0.01, keep stirring until a blue-black gel is obtained. After the obtained gel was dried at 120 °C, it was calcined at 750 °C for 1 h in an air atmosphere to obtain 1% LiCoO 2 Coated LiNi 0.8 co 0.2 o 2 Material.

Embodiment 2

[0028] Experimental process is with embodiment 1, and difference is that molar ratio LiNi 0.8 co 0.2 o 2 : LiCoO 2 =1:0.05, finally get 5% LiCoO 2 Coated LiNi 0.8 co 0.2 o 2 Material.

Embodiment 3

[0030] Experimental process is with embodiment 1, and difference is that molar ratio LiNi 0.8 co 0.2 o 2 : LiCoO 2 = 1:0.10, finally get 10% LiCoO 2 Coated LiNi 0.8 co 0.2 o 2 Material.

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Abstract

The present invention provides a positive electrode material LiNi1-xCoxO2 (x is greater than or equal to 0.15 or less than or equal to 0.30) covered by using LiCoO2 and its preparation method. Said material has good electric discharge multiplying factor specific property, charging and discharging circulating performance, safety and storage property.

Description

【Technical field】 [0001] The invention relates to a positive electrode material of a nonaqueous secondary battery, in particular to a lithium nickel cobalt oxide positive electrode material coated with lithium cobalt oxide and a preparation method thereof. 【Background technique】 [0002] LiCoO is currently the most widely used cathode material in lithium-ion secondary batteries. 2 , but due to limited and expensive cobalt resources, LiCoO 2 The use of the material and its batteries is limited. LiNiO 2 considered to be LiCoO 2 One of the most competitive alternative materials. Its theoretical capacity is comparable to that of LiCoO 2 close, and its self-discharge rate is low, no pollution to the environment, and LiCoO 2 Compared with the advantages of price and resources. But LiNiO 2 The synthesis conditions are harsh, the thermal stability is poor, and it is easy to cause safety problems. Therefore people try to use LiNiO 2 Co, Mn, Ga, Al, F and other elements are ...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/48H01M4/52H01M4/58H01M10/36
CPCY02E60/122H01M2004/028H01M4/525H01M4/04H01M10/052H01M4/131Y02E60/10
Inventor 王传福姜占峰董俊卿
Owner BYD CO LTD
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