Lithium ion battery anode material Li2Mn1-xMgxSiO4/C and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor chemical properties, achieve low synthesis temperature, improve discharge specific capacity, and excellent cycle performance.

Inactive Publication Date: 2017-06-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to aim at lithium ion battery cathode material manganese lithium silicate (Li 2 MnSiO 4 ) has the disadvantage of poor electrochemical performance, and provides a lithium-ion battery positive electrode material Li 2 mn 1-x Mg x SiO 4 / C and its preparation method, wherein 0≤x≤0.1; wherein, the carbon composite can improve the electronic conductivity of the material, and the cationic bulk phase doping can stabilize the structure of the material, improve the cycle stability of the material, and significantly improve the discharge specific capacity of the material and cycle stability; meanwhile, the present invention adopts sol-gel method to prepare Li 2 mn 1-x Mg x SiO 4 / C material, the prepared product has excellent crystal quality, good chemical uniformity, fine particles and high purity

Method used

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  • Lithium ion battery anode material Li2Mn1-xMgxSiO4/C and preparation method thereof
  • Lithium ion battery anode material Li2Mn1-xMgxSiO4/C and preparation method thereof
  • Lithium ion battery anode material Li2Mn1-xMgxSiO4/C and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033]When the Mg doping amount is 0.05, dissolve 0.02mol (1.3319g) lithium acetate, 0.0095mol (2.3519g) manganese acetate and 0.0005mol (0.0292g) magnesium hydroxide in an appropriate amount of deionized water and record it as solution a; (1.6896g) citric acid was dissolved in an appropriate amount of deionized water, which was recorded as solution b; solution b was slowly added to solution a, and stirred evenly; then 0.01mol (2.083g) orthosilicon Ethyl acetate ethanol solution, stirred for 0.5h; finally the mixed solution was transferred to a single crystal flask with a water bath temperature of 85°C, taken out after 24 hours of reaction, and dried to obtain a xerogel; the xerogel was dispersed in absolute ethanol agent, the rotation speed is 400r / min, the ball-to-material ratio is 8:1, and it is taken out and dried after ball milling for 6 hours; after the mixture is ground evenly, it is sintered at 3°C / min in a tube furnace at 700°C for 10h under an argon atmosphere. After...

Embodiment 2

[0036] When the Mg doping amount is 0.02, dissolve 0.02mol (1.3319g) lithium acetate, 0.0098mol manganese acetate and 0.0002mol magnesium hydroxide in an appropriate amount of deionized water and record it as solution a; dissolve 0.008mol citric acid in an appropriate amount of deionized water , recorded as solution b; slowly add solution b to solution a, and stir evenly; then add 0.01mol ethanol solution of tetraethyl orthosilicate dropwise to the obtained mixed solution, and stir for 0.5h; finally, the mixed solution is transferred to In the single crystal flask, the temperature of the water bath is 85°C, take it out after 24 hours of reaction, and dry to obtain the xerogel; use absolute ethanol as the dispersant, the rotation speed is 400r / min, the ball-to-material ratio is 8:1, After ball milling for 6 hours, take it out and dry it; after the mixture is evenly ground, heat it up to 700°C for 10 hours in a tube furnace under an argon atmosphere at 3°C / min and sinter it for 1...

Embodiment 3

[0039] When the Mg doping amount is 0.02, dissolve 0.02mol (1.3319g) lithium acetate, 0.0098mol manganese acetate and 0.0002mol magnesium hydroxide in an appropriate amount of deionized water and record it as solution a; dissolve 0.024mol citric acid in an appropriate amount of deionized water , recorded as solution b; slowly add solution b to solution a, and stir evenly; then add 0.01mol ethanol solution of tetraethyl orthosilicate dropwise to the obtained mixed solution, and stir for 0.5h; finally, the mixed solution is transferred to In the single crystal flask, the temperature of the water bath is 85°C, take it out after 24 hours of reaction, and dry to obtain the xerogel; use absolute ethanol as the dispersant, the rotation speed is 400r / min, the ball-to-material ratio is 8:1, After ball milling for 6 hours, take it out and dry it; after the mixture is evenly ground, heat it up to 700°C for 10 hours in a tube furnace under an argon atmosphere at 3°C / min and sinter it for 1...

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Abstract

The invention belongs to the field of lithium ion batteries and provides a lithium ion battery anode material Li2Mn1-xMgxSiO4/C and a preparation method thereof, wherein x is larger than or equal to 0 and smaller than or equal to 0.1. The defect of poor electrochemical performances of an existing lithium ion battery anode material Li2MnSiO4 can be overcome. Electronic conductivity of the material can be improved by carbon compounding, and by doping of positive ions, the material can be stabilized structurally, cycle stability of the material is improved, and specific discharge capacity and cycle stability of the material are improved remarkably. In addition, by adoption of a sol-gel method for preparation of the material Li2Mn1-xMgxSiO4/C, a prepared product has advantages of high crystallization quality, high chemical uniformity, particle fineness, high purity and suitableness for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material Li 2 mn 1-x Mg x SiO 4 / C and its preparation method, wherein 0≤x≤0.1. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, and no memory effect, and have been widely used in various electronic products and portable devices. Traditional lithium-ion battery cathode materials such as lithium cobaltate, lithium manganate, nickel-cobalt binary or nickel-cobalt-manganese ternary, etc., have matured in research, but there are bottleneck problems: low specific capacity, low energy density, Limited resources, environmental pollution, and poor safety are still difficult to overcome. In order to pursue new cathode materials with low cost and high specific energy, polyanio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01G45/00
CPCC01G45/006C01P2002/72C01P2004/03C01P2004/80C01P2006/40H01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 刘兴泉刘珊珊赵红远王震伟蔡宇谭铭张美玲舒小会
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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