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A kind of preparation method of modified lithium iron phosphate cathode material

A positive electrode material, lithium iron phosphate technology, applied in the direction of chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of poor rate discharge performance, poor low temperature performance of batteries, low conductivity, etc., to improve low temperature performance and rate Discharge performance and the effect of improving electrical conductivity

Active Publication Date: 2016-04-27
江西华昊新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the defects of low electrical conductivity and low lithium ion conductivity of lithium iron phosphate, the battery has poor low temperature performance and poor rate discharge performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] With 0.1mol lithium nitrate, 0.1mol ammonium dihydrogen phosphate, 0.097mol ferric nitrate, 0.002molEr 2 o 3 ,0.001molNd(Ac) 3 ,mix. Dissolve the mixture in deionized water (the mass ratio of mixture to deionized water is 1: (0.7~1.2). Stir at 80°C for 4 hours until a jelly is formed. Calcinate the jelly at 300°C for 3 hours, the resulting material was added to 100ml of absolute ethanol for ball milling, and ball milling for 10 hours. The ball milled powder was mixed with 120ml polyethylene glycol and placed under argon protection, and calcined at 700°C for 12 hours. After cooling to room temperature, ball milling Obtain required powder. With gained material as positive electrode active material, Super-P is made conductive agent, and PVDF is made binding agent. Above several kinds of materials are in NMP solvent with the ratio of 85:10:5 (NMP: mixing material=1 : 1.8 weight ratio) and mix well, then spread on the aluminum foil, after drying, press into pole piece.

...

Embodiment 2

[0019] With embodiment 1, only Er 2 o 3 ,Nd(Ac) 3 The amounts are 0.001mol and 0.001mol, respectively.

comparative example 1

[0020] Comparative case 1 (no Er, Nd added).

[0021] Same as Example 1, except that no Er and Nd are added.

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PUM

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Abstract

The invention relates to a preparation method of a modified lithium iron phosphate positive electrode material. The invention relates to a preparation method of a positive electrode material of a lithium ion battery. The method comprises the steps that: a lithium compound, a Fe<3+> compound, phosphate, a reducing agent, and Er and Nd doping materials are mixed according to a certain molar ratio; the mixture is heated and stirred, such that a colloid is formed; the colloid is calcined; the obtained material is subjected to ball milling in a ball mill, and is calcined and naturally cooled to room temperature, such that a doped lithium ion positive electrode material is obtained. Compared with existing technologies, according to the invention, a lithium iron phosphate positive electrode material is modified, such that material conductivity is substantially improved, material low-temperature performance is improved, and material rate discharge performance is improved.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, and is particularly suitable for a preparation method of a modified lithium iron phosphate positive electrode material. Background technique [0002] In the current existing technology, lithium iron phosphate has its unique advantages as a lithium ion battery cathode material: 1 relatively high theoretical specific capacity of 170mAh / g; 2 good thermal and chemical stability; 3 low cost, low Toxicity and good safety performance; 4 long cycle life. However, due to the defects of low electrical conductivity and low lithium ion conductivity of lithium iron phosphate, the low temperature performance and rate discharge performance of the battery are poor. [0003] The technical problem to be solved by the object of the present invention is to improve the electrical conductivity and lithium ion conductivity of lithium iron phosphate by doping Er and Nd, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 王建立黄志义雷如清
Owner 江西华昊新能源有限公司