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Lithium ion battery negative electrode material FeS/Fe/C and preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the need to improve electrochemical performance, not solve the defects of ferrous sulfide, High preparation cost and other problems, to achieve the effect of improving electrochemical performance, increasing conductivity, and simple preparation method

Active Publication Date: 2018-09-28
江苏芯界新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical properties of the above-mentioned synthesized materials need to be improved, and the defects caused by the ferrous sulfide itself are not well resolved, and PAN or graphite oxide is used as the carbon source, resulting in high preparation costs

Method used

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  • Lithium ion battery negative electrode material FeS/Fe/C and preparation method thereof
  • Lithium ion battery negative electrode material FeS/Fe/C and preparation method thereof
  • Lithium ion battery negative electrode material FeS/Fe/C and preparation method thereof

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Embodiment 1

[0039] A preparation method of lithium ion battery negative electrode material FeS / Fe / C, comprising steps:

[0040] Dissolve 2.8083g of ferrous sulfate heptahydrate and 2.4509g of sodium sulfide nonahydrate in 50ml of distilled water respectively, and configure 0.2mol L -1 Iron source aqueous solution and 0.2mol L -1 sulfur source aqueous solution; in 50ml iron source aqueous solution, dropwise add 40ml papermaking waste liquid, stir 30min, obtain solution A; in solution A, add dropwise 50ml sulfur source aqueous solution and add 2ml 2wt℅ citric acid aqueous solution (0.0002mol), stir 30min , to obtain a mixture; put the mixture into a reaction kettle, treat it at a constant temperature at 180°C for 18h, and then cool it naturally to room temperature, take out the precipitate and wash it 3 to 4 times to obtain a black mixture, dry it in a 60°C thermostat and fully grind it, and put it in Under the protection of nitrogen atmosphere, calcined at 700°C for 8h, and cooled natural...

Embodiment 2

[0047] A preparation method of lithium ion battery negative electrode material FeS / Fe / C, comprising steps:

[0048] Dissolve 4.1015g of ferric nitrate nonahydrate and 2.5069g of sodium thiosulfate pentahydrate (the sulfur in sodium sulfate in sodium thiosulfate pentahydrate does not participate in the reaction and is not used as a sulfur source) in 50ml of distilled water, and configure 0.2mol L -1 Iron source aqueous solution and 0.2mol L -1 30ml of papermaking waste liquid was added dropwise to 50ml of iron source aqueous solution, and stirred for 30min to obtain solution A; 50ml of sulfur source aqueous solution was added dropwise to solution A and 2ml of 2wt℅citric acid aqueous solution was added, and stirred for 30min to obtain a mixture; Put the mixture into the reaction kettle, treat it at 150°C for 36 hours, then cool it down to room temperature naturally, take out the precipitate and wash it 3 to 4 times to obtain a black mixture, dry it in a constant temperature oven...

Embodiment 3

[0051] A preparation method of lithium ion battery negative electrode material FeS / Fe / C, comprising steps:

[0052] Dissolve 2.7303g of ferric chloride hexahydrate and 0.7689g of thiourea in 50ml of distilled water respectively, and configure 0.2mol L -1 Iron source aqueous solution and 0.2mol L -1 Add 50ml of papermaking waste liquid dropwise to 50ml of iron source aqueous solution, and stir for 30min to obtain solution A; add dropwise 50ml of sulfur source aqueous solution and 2ml of 2wt℅citric acid aqueous solution to solution A, and stir for 30min to obtain a mixture; Put the mixture into a reaction kettle, heat it at 200°C for 10 hours, then cool it down to room temperature naturally, take out the precipitate and wash it 3 to 4 times to obtain a black mixture, dry it in a constant temperature oven at 60°C and fully grind it, then put it under the protection of nitrogen atmosphere , calcined at 800°C for 6h, and naturally cooled to room temperature, the negative electrode...

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Abstract

The invention provides a lithium ion battery negative electrode material FeS / Fe / C and a preparation method thereof. The preparation method comprises the steps of dissolving an iron source and a sulfursource in distilled water according to a mole ratio of Fe and S being 1:1 to obtain an iron source aqueous solution and a sulfur source aqueous solution; and dropwise adding a papermaking red liquidinto the iron source aqueous solution, dropwise adding the sulfur source aqueous solution, finally adding an additive, performing uniform mixing, and performing hydrothermal treatment, washing, drying, grinding and calcination under protection of an inert gas to obtain the lithium ion battery negative electrode material FeS / Fe / C. The negative electrode prepared by the method has favorable electrochemical performance and has high specific capacity and favorable cycle stability. The method is simple, the industrial waste papermaking red liquid is used as one of main raw materials, and the cost is reduced as well as the waste is recycled.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material FeS / Fe / C and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Anode materials are an important part of lithium-ion batteries. Graphite has become one of the main negative electrode materials due to its high Coulombic efficiency and good safety. Lithium-ion battery development needs. To meet the energy storage requirements of high energy and power density, the exploration of alternative anode materials for Li-ion batteries has been extensively and continuously improved. Metal sulfides are a promising class of anode materials for lithium-ion batteries, which show higher theoretical specific capacities than traditional graphite materials and have attracted extensive research, among which ferrous sulfide is due to its simple structure, good electrochemical performance, The constituent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5815H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 何文尚鹏坤张旭东
Owner 江苏芯界新能源科技有限公司
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