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Lithium ion battery anode material LiSi2N3 and method for preparing material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsuitability for industrial production, high raw material prices, high synthesis temperature, etc., achieve low cost, improve lithium storage specific capacity, and react The effect of low temperature

Active Publication Date: 2015-05-20
SUZHOU ZIGUANG WEIYE LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently, LiSi 2 N 3 The production technology means is mainly solid phase method, that is, Li 3 N and α-Si 3 N 4 as raw material, in N 2 or N 2 +H 2 Synthesize LiSi by heat treatment at 1400~1800℃ for 6h under atmosphere 2 N 3 , LiSi prepared by this method 2 N 3 Although the powder has high crystallinity and simple process, but the particle size is relatively coarse, the synthesis temperature is high, the price of the raw materials used is high, and the energy consumption is large, so it is not suitable for industrial production

Method used

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  • Lithium ion battery anode material LiSi2N3 and method for preparing material
  • Lithium ion battery anode material LiSi2N3 and method for preparing material
  • Lithium ion battery anode material LiSi2N3 and method for preparing material

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Embodiment 1

[0027] A kind of negative electrode material LiSi of lithium ion battery 2 N 3 and its preparation method. Mix 15-25wt% elemental silicon powder, 25-35wt% melamine, 40-50wt% lithium source and 10-15wt% halide powder to prepare a mixture; then put the mixture into a tubular electric furnace In a nitrogen atmosphere, the temperature was raised to 900-1000°C at a rate of 2-5°C / min, and kept at a temperature of 4-6 hours; 3 and Ca(NO 3 ) 2 Titrate the solution until no white precipitate appears; finally dry at 110°C for 10 to 24 hours to obtain the lithium-ion battery negative electrode material LiSi 2 N 3 .

[0028] In this embodiment: the lithium source is lithium fluoride; the halide powder is a mixture of 50-60 wt% sodium chloride and 40-50 wt% potassium fluoride.

[0029] Lithium-ion battery anode material LiSi prepared by the present embodiment 2 N 3 It has high activity, large specific surface area, high purity, high specific capacity and stable performance. The cr...

Embodiment 2

[0031] A kind of negative electrode material LiSi of lithium ion battery 2 N 3 and its preparation method. Mix 15-25wt% elemental silicon powder, 25-35wt% melamine, 40-50wt% lithium source and 10-15wt% halide powder to prepare a mixture, and then put the mixture into a tubular electric furnace In a nitrogen atmosphere, the temperature was raised to 1100-1200°C at a rate of 2-5°C / min, and the temperature was kept for 2-4 hours; then the obtained product was repeatedly washed with deionized water until the AgNO 3 and Ca(NO 3 ) 2 Titrate the solution until no white precipitate appears; finally dry at 110°C for 10 to 24 hours to obtain the lithium-ion battery negative electrode material LiSi 2 N 3 .

[0032] In this embodiment: the lithium source is a mixture of 50-70 wt% lithium fluoride and 30-50 wt% lithium chloride; the halide powder is sodium chloride.

[0033] Lithium-ion battery anode material LiSi prepared by the present embodiment 2 N 3It has high activity, large...

Embodiment 3

[0035] A kind of negative electrode material LiSi of lithium ion battery 2 N 3 and its preparation method. Mix 10-20wt% elemental silicon powder, 35-45wt% melamine, 35-45wt% lithium source and 0.5-5wt% halide powder to prepare a mixture; then put the mixture into a tubular electric furnace In a nitrogen atmosphere, the temperature was raised to 1100-1200°C at a rate of 5-10°C / min, and the temperature was kept for 2-4 hours; then the obtained product was repeatedly washed with deionized water until the AgNO 3 and Ca(NO 3 ) 2 Titrate the solution until no white precipitate appears; finally dry at 110°C for 10 to 24 hours to obtain the lithium-ion battery negative electrode material LiSi 2 N 3 .

[0036] In this embodiment: the lithium source is lithium chloride; the halide powder is sodium fluoride.

[0037] figure 1 It is a lithium ion battery negative electrode material LiSi prepared by the present invention 2 N 3 The XRD pattern, figure 2 yes figure 1 The lithium...

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Abstract

The invention relates to a lithium ion battery anode material LiSi2N3 and a method for preparing the material. The technical scheme is as follows: the method comprises the following steps that 10-30wt% of elementary-substance silicon powder, 25-45wt% of trimeric cyanamide, 35-55wt% of a lithium precursor and 0.5-15wt% of halide powder are uniformly mixed to prepare a mixture; the mixture is placed in a tubular electric furnace, and heated up to 900-1200 DEG C at the heating rate of 2-10 DEG C / min under nitrogen atmosphere, and the temperature is kept for 2-6 hours; the prepared product is repeatedly washed by de-ionized water and titrated by respectively using AgNO3 and Ca(NO3)2 solutions until no white precipitates appear; and finally the prepared product is dried for 10-24 hours at 110 DEG C and thus the lithium ion battery anode material LiSi2N3 is prepared. The preparation method is low in reacting temperature and cost, easy to control, high in productivity, and applied to industrial production; the prepared lithium ion battery anode material LiSi2N3 is high in activity, large in specific surface area, high in purity and specific capacity, and steady in performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode materials. Specifically relate to a lithium ion battery negative electrode material LiSi 2 N 3 and its preparation method. Background technique [0002] Lithium-ion batteries have monopolized the power supply market of today's mobile electronic devices due to their long cycle life, high specific energy, low self-discharge rate, high open circuit voltage, no memory effect, and environmental friendliness. Electric vehicles powered by lithium-ion batteries (EV) and hybrid electric vehicles (HEV) have also received widespread attention. Today's commercial lithium-ion batteries generally use carbon materials as negative electrode materials, but the safety of carbon negative electrode materials is poor, and the irreversible capacity is large for the first time, which greatly limits the development space of lithium-ion batteries. [0003] Lithium nitride (Li 3 N) has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M4/58Y02E60/10
Inventor 梁峰张海军张少伟李发亮鲁礼林段红娟刘江昊
Owner SUZHOU ZIGUANG WEIYE LASER TECH CO LTD
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