Transition metal phosphide iron phosphide negative electrode material

A technology of transition metal and negative electrode material, applied in the field of negative electrode material, can solve problems such as low reversible capacity, and achieve the effects of shortening the transmission path, simple preparation process and low reaction temperature

Inactive Publication Date: 2019-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite material was assembled into a battery for electrochemical testing, at a test current of 100 mA·g -1 , the voltage range is 0.02 ~ 3V, its first reversible discharge capacity is 680 mAh·g -1 , the capacity tends to be stable after 15 cycles, and the capacity fades to 600 mAh·g after 100 cycles -1 , indicating that the material has a low reversible capacity

Method used

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  • Transition metal phosphide iron phosphide negative electrode material
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  • Transition metal phosphide iron phosphide negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix 10mL deionized water and 70mL N,N-dimethylformamide evenly to obtain 80mL homogeneous solution;

[0042](2) Add 10 mmol ferric chloride hexahydrate and 10 mmol terephthalic acid to the 80 mL homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0043] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 120°C for 12 hours, cool it naturally to room temperature, filter it, and use Water, ethanol and deionized water were used to cross-wash the filtrate 4 times respectively, and dry in an oven at 60°C for 24 hours to obtain a yellow powder;

[0044] (4) Roast the yellow powder obtained in step (3) in a high-purity argon atmosphere at 450°C for 5 hours, and cool naturally to room temperature to obtain black ferric oxide powder; the purity of high-purity argon gas is ≥99.99% (“ %" is volume percentage);

[...

Embodiment 2

[0052] (1) Mix 20mL deionized water and 60mL N,N-dimethylformamide evenly to obtain 80mL homogeneous solution;

[0053] (2) Add 8 mmol of ferric nitrate nonahydrate and 2 mmol of terephthalic acid to the 80 mL homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0054] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 120°C for 10 hours, cool it naturally to room temperature, filter it, and use it without Water, ethanol and deionized water were respectively cross-washed and filtered 4 times, and dried in an oven at 100°C for 12 hours to obtain a yellow powder;

[0055] (4) Roast the yellow powder obtained in step (3) in a high-purity argon atmosphere at 450°C for 4 hours, and cool naturally to room temperature to obtain black ferric oxide powder; the purity of high-purity argon gas is ≥99.99% (“ %" is volume perce...

Embodiment 3

[0063] (1) Mix 30mL deionized water and 60mL N,N-dimethylformamide evenly to obtain 90mL homogeneous solution;

[0064] (2) Add 0.4mmol ferric nitrate nonahydrate and 0.8mmol 3,5-diaminobenzoic acid to the 90mL homogeneous solution obtained in step (1), stir and dissolve evenly to obtain a mixed solution;

[0065] (3) Put the mixed solution obtained in step (2) in a polytetrafluoroethylene high-pressure reaction kettle, seal it, put it in a high-temperature drying oven, heat it at 100°C for 24 hours, cool it to room temperature naturally, filter it, and use it without Water, ethanol and deionized water were respectively cross-washed and filtered 4 times, and dried in an oven at 60°C for 24 hours to obtain a yellow powder;

[0066] (4) Roast the yellow powder obtained in step (3) in a high-purity nitrogen atmosphere at 450°C for 6 hours, and cool naturally to room temperature to obtain black ferric oxide powder; the purity of high-purity argon gas is ≥99.99% (“% " is the volum...

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Abstract

The invention discloses a transition metal phosphide iron phosphide negative electrode material. The transition metal phosphide iron phosphide negative electrode material is prepared from the following steps that (1) water and N,N-dimethylformamide are mixed evenly; (2) an iron source and an organic ligand are added, stirring is conducted, and thus a mixed solution is formed; (3) sealing, heatingreaction, cooling, filtering, washing and drying are conducted to obtain yellow powder; (4) in inert atmosphere, roasting and cooling are conducted to obtain black powder; and (5) sodium hypophosphiteand the black powder are placed at the upstream part and the downstream part of a tubular furnace, in the inert atmosphere, roasting and cooling are conducted, and thus the transition metal phosphideiron phosphide negative electrode material is formed. The particle size of the negative electrode material is 400-600 nm, the transition metal phosphide iron phosphide negative electrode material isassembled into a battery, under the situation that the voltage is within the range of 0.1-3 V and the testing current is 100 mA.g<-1>, the first charge specific capacity reaches 1241 mAh.g<-1>, the first discharge specific capacity reaches 672 mAh.g<-1>, the capacity retention ratio after 100 cycles of circulating is greater than or equal to 95%, the preparation technique is simple in process, thereaction temperature is low, the cycle is short, and the cost is low.

Description

technical field [0001] The invention relates to a negative electrode material, in particular to a transition metal phosphide iron phosphide negative electrode material for a lithium ion battery. Background technique [0002] With the consumption of non-renewable fossil energy such as oil and natural gas, the arrival of the energy crisis has attracted more and more attention. In this context, green and non-polluting new high-energy chemical power sources have become a hot spot in the development of countries all over the world. Lithium-ion battery is a new type of chemical power source, which is composed of two compounds that can reversibly insert and extract lithium ions as positive and negative electrodes. Since iron phosphide is used as the negative electrode material of lithium-ion batteries, it has a high theoretical specific capacity (926mAh g -1 ), and has attracted much attention because of its environmental friendliness. However, due to the large volume change of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08H01M4/58H01M10/0525
CPCC01B25/08C01P2002/72C01P2004/03C01P2004/61C01P2006/40C01P2006/80H01M4/5805H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 童汇黄英德毛高强黄硕喻万景郑俊超张宝
Owner CENT SOUTH UNIV
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