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Method for surface coating of lithium ion battery anode material with nanoscale iron phosphate

A lithium-ion battery, cathode material technology, applied in nanotechnology, battery electrodes, nanotechnology and other directions for materials and surface science, can solve problems such as uneven distribution, affect practical utility, etc., achieve simple and mature technology, reduce safety Hidden danger, avoid the effect of increasing the interface resistance of the material surface

Active Publication Date: 2015-06-10
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process first uses Fe(NO 3 ) 3 9H 2 O wetted LiCoO 2 , and then add the precipitant (NH 4 ) 2 HPO 4 , the reaction mode of positive addition will inevitably lead to the cladding FePO 4 Generate uneven distribution, which affects its actual utility

Method used

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  • Method for surface coating of lithium ion battery anode material with nanoscale iron phosphate
  • Method for surface coating of lithium ion battery anode material with nanoscale iron phosphate
  • Method for surface coating of lithium ion battery anode material with nanoscale iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 2% nanoscale FePO 4 coated LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material

[0050] Step 1: Preparation of Homogeneous FePO 4 the solution

[0051] ⑴ Preparation of ferric nitrate solution

[0052] Weigh analytically pure Fe(NO 3 ) 3 9H 2 O is used as iron source, is mixed with deionized water into 1.0mol / L iron salt aqueous solution;

[0053] Weigh analytically pure NH 4 h 2 PO 4 As a phosphorus source, prepare a 1.0mol / L phosphate aqueous solution with deionized water;

[0054] ⑵ Preparation of homogeneous FePO 4 the solution

[0055] First, pump the prepared iron salt solution into the stainless steel reaction kettle with a metering pump, set the reaction temperature at 50°C, and the stirring speed of the reaction kettle at 150r / min, then pump the phosphate solution into the iron salt solution with a metering pump to control the solution. The molar ratio of P / Fe in the mixture is 1.02, stir evenly to form a homogeneous brown FePO without precipitation 4 ...

Embodiment 2

[0067] 1% nanoscale FePO 4 coated LiNi 0.5 co 0.2 mn 0.3 o 2 Material

[0068] Change the concentration of iron salt aqueous solution and phosphate aqueous solution in Example 1 to 0.5mol / L, and other steps remain unchanged. After coating, LiNi 0.5 co 0.2 mn 0.3 o 2 ,D 50 =8.569μ㎡, specific surface area 0.36m 2 / g.

Embodiment 3

[0070] 3% nanoscale FePO 4 coated LiNi 0.5 co 0.2 mn 0.3 o 2 Material

[0071] Change the concentration of iron salt solution and phosphate solution in Example 1 to be 1.5mol / L, and the other steps remain unchanged. After coating, LiNi 0.5 co 0.2 mn 0.3 o 2 , D50=8.832μ㎡, specific surface area 0.56m 2 / g.

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Abstract

The invention relates to a method for surface coating of a lithium ion battery anode material with nanoscale iron phosphate. The method includes the preparation steps of: FePO4 solution preparation; anode material beating; slurry drying; powder sintering and sieving, thus finishing the process of surface coating of the lithium ion battery anode material with nanoscale iron phosphate. The in-situ generation method adopted by the invention can realize non-continuous compact coating of nanoscale FePO4 on the anode material surface, and significantly improve the safety performance and cycling performance of the anode material. Non-continuous coating of the anode material with the nanoscale FePO4 shows excellent safety performance, and the coated material can be taken as the lithium power battery anode material to greatly reduce the potential safety hazards from the material itself. ; During 0.2C charge-discharge, after 500 times of cycle, the capacity retention ratio is still greater than 98%, and after 500 times of 2C charge-discharge, 2C / 0.2C is greater than 94%. The anode material polarization degree is significantly reduced, and excellent rate capability is shown.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, in particular to a method for coating the surface of lithium-ion battery cathode materials with nanoscale iron phosphate. Background technique [0002] Affected by the international energy shortage and the deterioration of the human living environment, the replacement of traditional energy by new energy has become a long-term trend of social development. The transportation industry is a huge area of ​​energy consumption and the main source of air pollution. Therefore, the international community vigorously advocates the application of energy-saving and environmentally friendly alternative energy sources in the transportation industry. The application of lithium-ion batteries in this field has emerged as the times require. The opening of the electric vehicle market will grow rapidly, and the cathode material, as the core key material of the power battery, will show ex...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/1391H01M4/505H01M4/525B82Y30/00
CPCY02E60/10
Inventor 樊勇利许国峰李平
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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