Preparing method for lithium iron phosphate and lithium vanadium phosphate composite anode material precursor

A composite cathode material, lithium vanadium phosphate technology, applied in battery electrodes, electrical components, electrochemical generators and other directions, can solve problems such as the rate performance to be improved, poor ionic conductivity, etc., to achieve good physical processing performance, low cost, diffusion The effect of shortening the distance

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of lithium iron phosphate-lithium vanadium phosphate composite cathode material is poor, and its rate performance needs to be improved.

Method used

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  • Preparing method for lithium iron phosphate and lithium vanadium phosphate composite anode material precursor
  • Preparing method for lithium iron phosphate and lithium vanadium phosphate composite anode material precursor
  • Preparing method for lithium iron phosphate and lithium vanadium phosphate composite anode material precursor

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] (1) Take 4.82g (0.01mol) of ferrous gluconate and 2.44g (0.02mol) of sodium metavanadate and dissolve them in 500ml of deionized water respectively to obtain ferrous gluconate solution (concentration of ferrous ions is 0.02mol / L ) and sodium metavanadate solution, and then the obtained ferrous gluconate solution is mixed with sodium metavanadate solution to react to obtain a reaction solution, and then add PVP (0.013g ), stirring, adding ammonia water to adjust the pH to 6;

[0022] (2) The solution obtained in step (1) was ultrasonically stirred in a water bath at 60°C for 4 hours, and the frequency of ultrasonic stirring was 30KHz to obtain a homogeneous solution, which was then placed in a lined reaction kettle at a temperature of 180°C Reaction 20h;

[0023] (3) The reaction solution after the reaction in step (2) was filtered, washed, and vacuum-dried at -0.1 MPa at 90° C. for 8 hours to obtain iron metavanad...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] (1) Take 9.64g (0.02mol) of ferrous gluconate and 4.88g (0.04mol) of sodium metavanadate and dissolve them in 400ml of deionized water respectively to obtain ferrous gluconate solution (concentration of ferrous ions is 0.05mol / L ) and sodium metavanadate solution, then the obtained ferrous gluconate solution is mixed with sodium metavanadate solution to react to obtain a reaction solution, and then add PVP (0.005g ), stirring, adding ammonia water to adjust the pH to 8;

[0031] (2) The solution obtained in step (1) was ultrasonically stirred in a water bath at 75°C for 2 hours. Under reaction 15h;

[0032] (3) The reaction solution after the reaction in step (2) was filtered, washed, and vacuum-dried at -0.1 MPa at 80° C. for 10 hours to obtain ferrous metavanadate, a precursor of lithium iron phosphate-lithium vanadium phosphate composite positive electrode material.

[0033] Sample test: with 2.54g ferrous met...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] (1) Take 9.64g (0.02mol) of ferrous gluconate and 4.88g (0.04mol) of sodium metavanadate and dissolve them in 200ml of deionized water respectively to obtain ferrous gluconate solution (concentration of ferrous ions is 0.1mol / L ) and sodium metavanadate solution, then mixed the obtained ferrous gluconate solution with sodium metavanadate solution to react to obtain the reaction solution, then add PVP (0.05g ), stirring, adding ammonia water to adjust the pH to 4;

[0038](2) The solution obtained in step (1) was ultrasonically stirred in a water bath at 90°C for 4 hours, and the frequency of ultrasonic stirring was 20KHz to obtain a homogeneous solution, which was then placed in a lined reaction kettle at a temperature of 250°C Under reaction 10h;

[0039] (3) The reaction solution after the reaction in step (2) was filtered, washed, and vacuum-dried at -0.1 MPa at 120° C. for 5 hours to obtain ferrous metavanadat...

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Abstract

A preparing method for a lithium iron phosphate and lithium vanadium phosphate composite anode material precursor comprises the following steps that firstly, ray materials including ferrous gluconate and sodium metavanadate at the mole ratio of 1:2 are dissolved into deionized water respectively, a ferrous gluconate solution and a sodium metavanadate solution are obtained, the concentration of ferrous ions in the ferrous gluconate solution is controlled to be 0.01-0.1 mol / L, then the ferrous gluconate solution and the sodium metavanadate solution are mixed for a reaction, a reaction solution is obtained, PVP is added and stirred, and the pH is regulated to be 4-8 with ammonium hydroxide; secondly, ultrasonic stirring is carried out in a water bath pot at 60-90 DEG C, a uniform solution is obtained and then put into a reaction kettle with a liner, and a reaction is carried out at 180-250 DEG C; thirdly, filtering, washing and drying are carried out, and the lithium iron phosphate and lithium vanadium phosphate composite anode material precursor is obtained. Ferrous metavanadic acid of the lithium iron phosphate and lithium vanadium phosphate composite anode material precursor is in rodlike morphology, and a synthesized lithium iron phosphate and lithium vanadium phosphate composite anode material is excellent in electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate-lithium vanadium phosphate composite positive electrode material, in particular to a preparation method of a precursor of a lithium iron phosphate-lithium vanadium phosphate composite positive electrode material. Background technique [0002] LiFePO 4 It is a new type of cathode material for lithium-ion batteries. It has the advantages of excellent charge-discharge platform, good cycle performance, low price, high theoretical capacity, and environmental friendliness, and is considered to be the most promising cathode material for lithium-ion batteries. However, lithium iron phosphate materials have the disadvantages of poor electronic and ionic conductivity, which limits further applications. Therefore, finding new materials with better cost performance has become the focus of research. [0003] The lithium iron phosphate-lithium vanadium phosphate composite positive electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 郑俊超李晖张宝汤林波
Owner CENT SOUTH UNIV
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