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Surface decorated nano LiMVO4 positive electrode material and decoration method

A cathode material and surface modification technology, which is applied in the field of nano-anode materials and modification, can solve the problems of destroying cathode materials and battery electrochemical performance, and achieve the effect of improving electrochemical performance, low equipment requirements, and good reproducibility

Inactive Publication Date: 2006-11-08
武汉理工力强能源有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is a certain vicious interaction between the active cathode material and the electrolyte, which destroys the electrochemical performance of the cathode material and the battery.

Method used

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  • Surface decorated nano LiMVO4 positive electrode material and decoration method
  • Surface decorated nano LiMVO4 positive electrode material and decoration method
  • Surface decorated nano LiMVO4 positive electrode material and decoration method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] Example 1: Surface Modified SiO 2 nano-LiNi 0.5 co 0.5 VO 4 Preparation of cathode material

[0027] (1) Press LiNi 0.5 co 0.5 VO 4 The stoichiometric ratio weighs Ni 2 (OH)CO 3 、CoCO 3 , Li 2 CO 3 and V 2 o 5 , mix evenly, add organic acid while stirring, a large number of bubbles appear, continue to add organic acid until the bubbles disappear; then in a water bath at 80°C, add a mixed solution of polyethylene glycol and ethanol for ultrasonic treatment for 20 minutes; then stir for 10 minutes, 80~100℃ water bath to obtain xerogel; the obtained xerogel undergoes combustion reaction to obtain powdered LiNi 0.5 co 0.5 VO 4 Product; (2) in 100mL tetraethyl orthosilicate (Si(OCH 2 CH 3 ) 4 ) was added 6mL of ethanol, and stirred to form a uniform solution; (3) the LiNi synthesized in step 1 0.5 co 0.5 VO 4 Add 0.5 mol of the powder into the solution obtained in step 2, and stir to disperse it evenly; (4) Use ultrasonic treatment with a power of 200-60...

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Abstract

This invention is nanometer LiMVO4 positive pole material with surface decorated and its decorating method. This material is nanometer LiMVO4 positive pole material with surfacing decorated with SiO2 decorating layer, there into M is the complex of any one or any two of Ni, Co, Cu and Ti. The decorating method is to adopt organic acid complexation to compose LiMVO4 nanometer powder, then mix the nanometer powder with ethanol solution of positive tetraethyl silicate, carry out ultrasonic process and heat to 40deg.Cto get dry powder. Expose the dry powder in the sun for 2-4 days, then put it into the furnace, heat process for 8-12 hours under the temperature of 500-700 deg.C, and then obtain the surface decorated nanometer LiMVO4 positive pole material.

Description

technical field [0001] The invention relates to a surface-modified nano positive electrode material and a modification method, in particular to SiO 2 Modified nano-LiMVO 4 Cathode materials and modification methods. Background technique [0002] Since Sony launched the market-oriented lithium-ion battery in 1990, this secondary battery has developed rapidly as a room-temperature rechargeable source for portable devices and memory support circuits. However, there is a certain vicious interaction between the active cathode material and the electrolyte, which destroys the electrochemical performance of the cathode material and the battery. In order to suppress this vicious interaction and improve electrochemical performance, surface modification of electrode materials has attracted widespread interest. LiMVO 4 (where M is any metal element in Ni, Co, Cu, Ti or a combination of two or more metal elements in them) is an important high-voltage cathode material, but it also suf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01G1/02
CPCH01M4/485H01M4/525Y02E60/10
Inventor 陈文麦立强徐庆祁琰媛彭俊锋周静黄学辉
Owner 武汉理工力强能源有限公司