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Preparation method of positive pole material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of cathode materials for lithium-ion batteries, and can solve the problems of low electrical conductivity and discharge specific capacity

Active Publication Date: 2011-12-07
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a new lithium ion battery positive electrode material and a preparation method thereof in order to overcome the defects of low electrical conductivity and discharge specific capacity when the existing lithium iron phosphate is used as the positive electrode material of the lithium ion battery. The positive electrode material of the lithium ion battery has high electrical conductivity, and the lithium ion battery prepared by using the positive electrode material of the lithium ion battery has a very high discharge specific capacity

Method used

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Examples

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Effect test

Embodiment 1

[0025] This example is used to illustrate the lithium ion battery positive electrode material and its preparation method provided by the present invention.

[0026] (1) 2,4,6-trinitrotoluene and cyclotrimethylenetrinitramine (both provided by Nanjing University of Science and Technology) are mixed in a weight ratio of 70:30, and packed in a sealed bag, and then the sealed The bag is placed under water, and the material in the bag is detonated to obtain black powder, which contains 20% by weight of nano-diamonds (3-20 nanometers in particle size) and 80% by weight of diamond powder by XRD powder diffraction method. Nano carbon black (particle size is 4-15 nanometers).

[0027](2) the mixture (Li: Fe: P: Nb=1: 1.005: 1.005:0.002) were mixed evenly, then the mixture was mixed with 60 parts by weight of absolute ethanol, and added to a ball mill for ball milling for 20 hours to obtain a mixed slurry; then the mixed slurry was spray-dried under nitrogen protection Drying is carri...

Embodiment 2

[0030] According to the method for embodiment 1, lithium ion battery cathode material is prepared, and the difference is that the black powder containing nano-diamond and nano-carbon black obtained in the step (1) of 3 parts by weight is directly mixed with the lithium iron phosphate of 100 parts by weight (purchased from Hebei Litong Energy Technology Co., Ltd.) were mixed, then mixed with absolute ethanol and ball milled to obtain a mixed slurry, thereby preparing positive electrode material A2.

Embodiment 3

[0032] This example is used to illustrate the lithium ion battery positive electrode material and its preparation method provided by the present invention.

[0033] The positive electrode material of lithium ion battery was prepared according to the method of Example 1, except that niobium oxalate was not used, thereby preparing positive electrode material A3.

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Abstract

The invention provides a positive pole material of a lithium ion battery, wherein the positive pole material contains lithium iron phosphate, nano-diamonds and nano-carbon black. The invention also provides a preparation method of the positive pole material of the lithium ion battery, comprising the following steps of: mixing a lithium source, an iron source and a phosphorus source with a mixturecontaining the nano-diamonds and the nano-carbon black to prepare a positive pole material precursor; and then sequentially carrying out heat treatment on the positive pole material precursor at 450-550 DEG C for 2-6 hours and at 600-700 DEG C for 2-10 hours in an inert gas atmosphere. The positive pole material of the lithium ion battery of the invention contains the nano-diamonds and the nano-carbon black such that the conductivity of the positive pole material of the lithium ion battery is greatly enhanced and further the lithium ion battery prepared from the positive pole material has obviously enhanced specific discharge capacity.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method of the lithium ion battery cathode material. Background technique [0002] As a chemical power source with high specific capacity, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. preferred. [0003] Lithium iron phosphate (LiFePO 4 ) is a research hotspot of positive electrode active materials for lithium-ion batteries. Preliminary studies have shown that LiFePO 4 Concentrated LiCoO 2 , LiNiO 2 , LiMnO 4 The respective advantages of such materials: no precious metals, cheap raw materials, extremely rich resources; moderate working voltage (3.4V); good platform characteristics, stable voltage; stable structure, good safety performance (oxygen and phosphorus are firmly bonded by strong covalent bonds combination, making it difficult for the material to deco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 李鸿利
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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