Composite positive elelectrode material of lithium ion cell and its prepn. method

A composite positive electrode material and lithium-ion battery technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of material volume specific energy reduction, overall density reduction, side reaction increase, etc., to achieve small impact, The effect of low volumetric energy density

Inactive Publication Date: 2005-01-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ① By controlling LiFePO 4 The method of grain growth does not significantly improve the conductivity of the material, because although the grain size becomes smaller and the specific surface area increases, the Li + The diffusion path becomes shorter, but the electrolyte in LiFePO 4 The possibility of side reactions on the surface increases;
[0006] ②Due to the density ratio of carbon black to LiFePO 4 is much smaller, adding too much carbon black during synthesis will make the overall density of the material smaller, so that the volume specific energy of the material will also be greatly reduced;
[0007] ③The process of directly doping metal powder method is prone to metal powder sedimentation, and the particle size of the powder is difficult to control, so that the metal powder in LiFePO 4 The uneven distribution in the material affects the electrical properties of the material;
[0008] ④ Doping transition metal (M) elements such as manganese or cobalt to form Li (M y Fe 1-y )PO 4 Reduce the stability of the crystal structure of the material, thereby affecting the electrical properties of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] LiOH, (NH 4 )H 2 PO 4 , AgNO 3 and Co(NO 3 ) 2 Concentration is prepared respectively as the aqueous solution of 0.5mol / L, 5.0mol / L, 0.05mol / L and 0.05mol / L; Get 240ml concentration and be the LiOH solution of 0.5mol / L and 16ml concentration be the (NH 4 )H 2 PO 4 After the solution was mixed evenly, 20ml of AgNO with a concentration of 0.05mol / L was added sequentially. 3 Solution, 12ml concentration is 0.05mol / L Co(NO 3 ) 2 Solution, 0.005mol citric acid, 0.005mol ethylene glycol, after completely dissolved, then add 0.12mol FeC 2 o 4 2H 2 O and 0.0015mol glucose, heated in boiling water and continued to stir for 30min to obtain the sol, dried the sol in vacuum at 120°C for 4h to obtain the gel; Heated at 150°C for 8 hours, cooled and ground to contain PO 4 3- , Li + 、Co 2+ , Fe 2+ , the reaction precursor of simple metal Ag and carbon black; the reaction precursor is placed in a well-type furnace, fed with nitrogen for protection, heated to 700°C for ...

Embodiment 2

[0027] LiNO 3 、H 3 PO 4 , AgNO 3 and Ni(NO 3 ) 2 Prepare the aqueous solutions with concentrations of 5mol / L, 0.5mol / L, 0.5mol / L and 0.5mol / L respectively; take 16ml of LiNO with a concentration of 5mol / L 3 solution and 240ml of H with a concentration of 0.5mol / L 3 PO 4 After the solution was mixed evenly, 10ml of AgNO with a concentration of 0.5mol / L was added sequentially. 3 solution, 8ml of Ni(NO) with a concentration of 0.5mol / L 3 ) 2 Solution, 0.05mol citric acid, 0.05mol ethylene glycol, after completely dissolved, then add 0.08mol FeC 2 o 4 2H 2 O and 0.0025mol glucose, heated in boiling water and continuously stirred for 150min to obtain the sol, and vacuum-dried the sol at 60°C for 8h to obtain the gel; then put the gel in a well-type furnace and pass in nitrogen for protection. Heated at 350°C for 10 hours, cooled and ground to obtain PO 4 3- , Li + 、Ag + , Fe 2+ 1. The reaction precursor of simple metal Ni and carbon black; the reaction precursor is...

Embodiment 3

[0030] CH 3 COOLi, LiNO 3 , (NH 4 ) 2 HPO 4 , (NH 4 )H 2 PO 4 , AgNO 3 and Cu(NO 3 ) 2 Prepare the aqueous solutions with concentrations of 1.0mol / L, 1.0mol / L, 1.0mol / L, 1.0mol / L, 0.15mol / L and 0.1mol / L respectively; take 50ml of CH with a concentration of 1.0mol / L 3 COOLi solution, 50ml of LiNO with a concentration of 1.0mol / L 3 Solution, 50ml concentration of 1.0mol / L (NH 4 ) 2 HPO 4 solution and 50ml concentration of 1.0mol / L (NH 4 )H 2 PO 4 After the solution was mixed evenly, 10ml of AgNO with a concentration of 0.15mol / L was added sequentially. 3 Solution, 10ml concentration is 0.1mol / L Cu(NO 3 ) 2 Solution, 0.015mol citric acid, 0.015mol ethylene glycol, after completely dissolved, then add 0.1mol FeC 2 o 4 2H 2 O and 0.0015mol glucose, heated in boiling water and continuously stirred for 60 minutes to obtain a sol, dried the sol in vacuum at 80°C for 6 hours to obtain a gel; then placed the gel in a well-type furnace, and fed nitrogen gas for prote...

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Abstract

Molecular formula of composite anode material is as following: LiMxFe1-x /(C+M'), where M is Co, Mn, Cr, Ni, Cu, Ag or Au; M' is Co, Mn, Cr, Ni, Cu, Ag or Au, 0 C01D 15/02 C01G 1/02 H01M 4/04 H01M 4/48 H01M 4/58 0 8 2 2004/3/15 1564347 2005/1/12 000000000 Huanan Tech Univ. Guangzhou 510640 Zhou Zhentao Lu Zhengzhong yu xiaomeng 44102 The Patent Agency of Guangdong Provincial Institutions of High learning No.72 Nonlinxia Road, the City of Guangzhou, Guangdong Province 510080

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and more specifically relates to a lithium-ion battery composite cathode material and a preparation method thereof. Background technique [0002] LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and LiFePO 4 Both can be used as cathode materials for lithium-ion batteries. Among them, LiCoO 2 High cost, expensive, poor safety, poor resources, high toxicity; LiNiO 2 The preparation is difficult, the thermal stability is poor, and the safety is also poor; LiMn 2 o 4 Although the safety is good, its discharge specific capacity is low, and its cycle reversibility and high temperature performance are poor; while olivine type lithium iron phosphate (II) (LiFePO 4 ) compared with the first three cathode materials, has the advantages of cheap, non-toxic, rich raw materials, good safety and thermal stability, high charge and discharge efficiency, etc., so it has a wide range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01G1/02H01M4/136H01M4/58H01M10/0525
CPCY02E60/122H01M4/5825H01M10/0525H01M4/136Y02E60/10
Inventor 周震涛吕正中
Owner SOUTH CHINA UNIV OF TECH
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