Preparation of lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for lithium ion battery

A lithium vanadium phosphate, ion battery technology, applied in battery electrodes, phosphorus compounds, secondary batteries, etc., can solve the problems of poor cycle performance and rate performance, limited application of lithium ion batteries, low lithium ion diffusion coefficient, etc. The effect of balanced performance, high capacity and broad application prospects

Inactive Publication Date: 2014-04-30
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiCoPO4 and Li3V2(PO4)3 are two A representative phosphate system cathode material, LiCoPO4 has a discharge platform of 4.8 V and a theoretical discharge specific capacity of 167 mAh g-1, with high energy density and thermal stability It is an ideal anode material for high-potential lithium-ion batteries, but the low electronic conductivity of LiCoPO4 and the low diffusion coefficient of lithium ions lead to its cycle performance. and rate performance are poor, limiting the application in high-capacity, high-voltage lithium-ion batteries

Method used

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  • Preparation of lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for lithium ion battery
  • Preparation of lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for lithium ion battery
  • Preparation of lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for lithium ion battery

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Embodiment 1

[0021] A preparation of lithium cobalt phosphate-lithium vanadium phosphate composite lithium ion battery positive electrode material, the chemical formula of the composite material is LiCoPO 4 -Li 3 V 2 (PO 4 ) 3 ,Proceed as follows:

[0022] 1) Mix 7.77g of lithium carbonate, 11.698g of ammonium metavanadate, 12.454g of cobalt acetate, and 23.004g of ammonium dihydrogen phosphate to obtain a mixture;

[0023] 2) Add asphalt and ethanol solvent to the above mixture, the mass ratio of asphalt to the mixture is 1:5, the volume ratio of ethanol solvent to the mixture is 2:1, and then ball mill in a planetary ball mill at a speed of 400r / min for 7h , to obtain the precursor powder;

[0024] 3) Dry the above precursor powder in an oven at 60°C;

[0025] 4) Transfer the dried precursor powder to a tube furnace, and calcine it under an argon atmosphere, raise the temperature to 500°C at a heating rate of 5°C / min, calcine at a constant temperature for 5 hours, and then raise th...

Embodiment 2

[0029] A preparation of lithium cobalt phosphate-lithium vanadium phosphate composite lithium ion battery positive electrode material, the chemical formula of the composite material is LiCoPO 4 -3Li 3 V 2 (PO 4 ) 3 ,Proceed as follows:

[0030] 1) Mix 3.885g of lithium carbonate, 7.0188g of ammonium metavanadate, 2.4908g of cobalt acetate, and 11.502g of ammonium dihydrogen phosphate to obtain a mixture;

[0031] 2) Add citric acid and ethanol solvent to the above mixture, the mass ratio of citric acid to the mixture is 1:10, the volume ratio of ethanol solvent to the mixture is 2:1, and then in the planetary ball mill at 400r / min Ball milling for 7 hours to obtain the precursor powder;

[0032] 3) Dry the above precursor powder in an oven at 100°C;

[0033] 4) Transfer the dried precursor powder to a tube furnace and calcine it in a nitrogen atmosphere. At a heating rate of 8 ℃ / min, raise the temperature to 400 ℃, calcine at a constant temperature for 8 hours, and then ...

Embodiment 3

[0037] A preparation of lithium cobalt phosphate-lithium vanadium phosphate composite lithium ion battery positive electrode material, the chemical formula of the composite material is LiCoPO 4 -5Li 3 V 2 (PO 4 ) 3 ,Proceed as follows:

[0038] 1) Mix 6.216g of lithium carbonate, 11.698g of ammonium metavanadate, 2.4908g of cobalt acetate, and 18.4032g of ammonium dihydrogen phosphate to obtain a mixture;

[0039] 2) Add glucose and ethanol solvents to the above mixture, the mass ratio of glucose to the mixture is 1:20, and the volume ratio of ethanol solvent to the mixture is 2:1, and then ball mill for 12 hours in a planetary ball mill at a speed of 400r / min , to obtain the precursor powder;

[0040] 3) Dry the above precursor powder in an oven at 80°C;

[0041] 4) The dried precursor powder was transferred to a tube furnace, and calcined in a mixed gas atmosphere of argon and hydrogen. The volume content of hydrogen in the mixed gas was 10%, and the heating rate was 0...

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Abstract

The invention relates to preparation of a lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for a lithium ion battery. The chemical formula of the composite material is xLiCoPO4-yLi3V2(PO4)3, wherein 0<x<=5, 0<y<=5. The preparation steps are as follows: uniformly mixing compounds of a lithium source, a cobalt source, a vanadium source and a phosphorus source; adding a carbon source and an ethyl alcohol solution, and then ball-milling in a planetary ball mill, so as to obtain precursor powder; drying in a drying oven; and transferring to a tube furnace and roasting twice, so as to obtain the target object. The preparation of the lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for a lithium ion battery, provided by the invention has the advantages that the new-type lithium cobalt phosphate-lithium vanadium phosphate positive electrode material for the lithium ion battery is synthesized by utilizing a solid phase method for the first time, through complementation of the two materials, the new-type next-generation lithium ion battery positive electrode material which achieves security and high capacity, and balances the cycle performance with the rate capability can be obtained, manufacturing method and conversion unit are simple, conditions are easy to control, industrial scale production is easy to realize, and wide application prospect can be achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to the preparation of lithium cobalt phosphate-lithium vanadium phosphate composite lithium ion battery cathode materials. Background technique [0002] With the wider application of lithium-ion batteries, especially in the large-scale application of electric vehicles and energy storage batteries, higher requirements are placed on the safety performance and specific energy density of batteries. Phosphate-based materials have the advantages of good safety performance, low raw material price, environmental friendliness, good stability and safety performance, etc., which have become the current research hotspots of cathode materials for lithium-ion batteries. LiCoPO 4 and Li 3 V 2 (PO 4 ) 3 are two representative phosphate system cathode materials, LiCoPO 4 The discharge platform is 4.8 V, and the theoretical discharge specific capacity is 167 mAh g -1 , has the advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/372C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 张联齐郭粉霞
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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