High density ultrafine composite ferric lithium phosphate anode material and preparation method

A lithium iron phosphate and cathode material technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of uneven particle size distribution of reaction products, difficult to reach nano-scale, and high price of lithium cobalt oxide. Excellent cycle performance, uniform distribution of conductive agent, and excellent electrical conductivity

Active Publication Date: 2007-02-07
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

to LiCoO 2 However, the existing problems are that the price of lithium cobaltate is high due to the lack of cobalt resources, and its thermal stability is poor and cobalt is harmful to the environment.
The advantage of the high-temperature method is that it is easy to realize industrial production, but the particle size distribution and irregular shape of the reaction product are difficult to achieve nanoscale

Method used

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  • High density ultrafine composite ferric lithium phosphate anode material and preparation method
  • High density ultrafine composite ferric lithium phosphate anode material and preparation method
  • High density ultrafine composite ferric lithium phosphate anode material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0040]Ammonium dihydrogen phosphate of 0.5mol / L, 0.5mol / L ferrous acetate, 0.5mol / L lithium carbonate, 3.07 grams of magnesium acetate, and 4.91 grams of polypropylene were mixed, placed in a closed reactor and stirred at high speed for 1 hour, and then Add oxalic acid dropwise therein, the concentration of oxalic acid is 0.03mol / L. Adjust the stirring rate to 120r / min, adjust the flow rate of ammonia water, and control the pH value of the solution to 9.0. Then remove the solvent from the obtained gel-type precipitate at less than 100°C, wash away the unreacted reaction with deionized water, and then separate the nano-precursor; in an atmosphere of inert gas protection, place it In a microwave oven at 700°C for 5-300 minutes of heat preservation reaction for microwave synthesis, and finally nano-scale lithium iron phosphate powder can be obtained.

[0041] The electrochemical performance of the obtained material is determined by the following method: 92% positive electrode ac...

Embodiment 2

[0043] The ammonium dihydrogen phosphate of 0.5mol / L, the 0.5mol / L ferrous sulfate that is 1.2 times the theoretical amount, the 0.5mol / L lithium carbonate that is 1.2 times the theoretical amount, 5.06 grams of magnesium acetate and 6.09 grams of sucrose are mixed, placed in Carry out high-speed stirring in the closed reactor for half an hour, then drop tartaric acid wherein, the concentration of tartaric acid is 0.03mol / L. Adjust the stirring rate to 120r / min, adjust the flow rate of dripping ammonia water, and control the pH value of the solution to 8.5. Then remove the solvent from the obtained gel-type precipitate at less than 100°C, wash away the unreacted reaction with deionized water, and then separate the nano-precursor; in an atmosphere of inert gas protection, place it In a microwave oven at 650° C. for 5-300 minutes of heat preservation and reaction for microwave synthesis, nano-scale lithium iron phosphate powder can be finally obtained.

Embodiment 3

[0045] Mix 0.5mol / L phosphoric acid, 0.5mol / L ferrous oxide, 0.5mol / L lithium hydroxide, 5.06 grams of magnesium acetate and 7.58 grams of polyacrylamide, place them in a closed reactor for high-speed stirring for 2 hours, and then pour them into Tartaric acid was added dropwise, and the concentration of tartaric acid was 0.03mol / L. Adjust the stirring rate to 120r / min, adjust the flow rate of ammonia water, and control the pH value of the solution to 9.0. Then remove the solvent from the obtained gel-type precipitate at less than 100°C, wash away the unreacted reaction with deionized water, and then separate the nano-precursor; in an atmosphere of inert gas protection, place it In a microwave oven at 750° C. for 5-300 minutes of heat preservation and reaction for microwave synthesis, nano-scale lithium iron phosphate powder can be finally obtained.

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Abstract

This invention belongs to battery field, which relates to ultra-micro compound lithium iron phosphate cathode material with high density and its fabrication method. Said cathode material is prepared by mixing iron salt, lithium salt and phosphates at a P/Li/Fe ratio of 1-1.1:1-1.1:1-1.1, adding conductive additives containing dopant element and carbon-bearing organic compound, adding organic acid as carrier, adjusting pH, controlling solution temperature in reactor to form sol, separating the sol to obtain nano-precursor and placing it into micorwave oven under protection of inert gas, and obtaining the final product. It is easy to control the chemical component, phase composition and particle size distribution. The conductive additive can be well-distributed. The method also has the advantages of short reaction time, low energy consumption during synthesis process and low cost. The obtained composite has high purity and good compatibility with electrolyte, excellent conductive property and charge and discharge property with large current, and good structure stability,thermal stability and cycle performance.

Description

[0001] Field: [0002] The invention relates to a high-density ultramicro-composite lithium iron phosphate positive electrode material and a preparation method thereof, which belong to the field of batteries, and in particular to a high-density nanoscale composite lithium iron phosphate lithium ion positive electrode material and a preparation method thereof. Background technique [0003] Lithium-ion batteries have the characteristics of high cell voltage, high energy density, no memory effect, safe use, and wide operating temperature. They have been widely used in mobile phones, notebook computers, electronic instruments, UPS, and various portable electric tools. [0004] Cathode materials are an important part of lithium-ion batteries. So far, commercial lithium-ion battery cathode materials still mainly use LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . to LiCoO 2 However, the existing problems are that the price of lithium cobalt oxide is high due to the lack of cobalt resources, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 李军赖桂棠黄慧民夏信德薛建军李大光
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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