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A skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and its preparation method and application

A technology of aluminum nitride and amorphization, applied in the direction of chemical instruments and methods, nitrogen compounds, phosphides, etc., can solve the problems of poor cycle stability of lithium-ion batteries and achieve the effect of improving cycle stability

Active Publication Date: 2022-02-18
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that metal lithium electrodes can produce dendrites and lead to poor cycle stability of lithium-ion batteries, the invention provides a method for preparing a skeleton-supported aluminum nitride amorphous modified lithium negative electrode material

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  • A skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and its preparation method and application
  • A skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and its preparation method and application
  • A skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and its preparation method and application

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Embodiment 1

[0033] This embodiment provides a skeleton-supported AlN amorphous modified lithium negative electrode material, the preparation method of which is as follows:

[0034] S1. Use ferric nitrate and polyvinylpyrrolidone as raw materials, mix according to the mass ratio of 1:2.0, then dissolve in deionized water, and react for 6 hours under magnetic stirring conditions at 55°C; then transfer the uniformly dispersed solution to hydrothermal reaction In the still, the carbonized melamine sponge is placed in the reaction kettle in advance (the treatment conditions of the melamine sponge are: argon-hydrogen mixed atmosphere, carbonization temperature 750°C, carbonization time 12h); The carbon-phosphorus-iron compound precursor was obtained by reacting at lower temperature for 24 hours; finally, the prepared carbon-phosphorus-iron compound precursor was subjected to carbonization reaction in a tubular sintering furnace with a nitrogen atmosphere, the carbonization temperature was 800°C,...

Embodiment 2

[0038] This embodiment provides a skeleton-supported AlN amorphous modified lithium negative electrode material, the preparation method of which is as follows:

[0039] S1. Use ferric nitrate and polyvinylpyrrolidone as raw materials, mix according to the mass ratio of 1:1, then dissolve in deionized water, and react under magnetic stirring conditions at 85°C for 12h; then transfer the uniformly dispersed solution to hydrothermal reaction In the still, the carbonized melamine sponge is placed in the reaction kettle in advance (the treatment conditions of the melamine sponge are: argon-hydrogen mixed atmosphere, carbonization temperature 600°C, carbonization time 12h); The carbon-phosphorus-iron compound precursor was obtained by reacting at lower temperature for 24 hours; finally, the obtained carbon-phosphorus-iron compound precursor was subjected to carbonization reaction in a tubular sintering furnace with a nitrogen atmosphere, the carbonization temperature was 600°C, and t...

Embodiment 3

[0043] This embodiment provides a skeleton-supported AlN amorphous modified lithium negative electrode material, the preparation method of which is as follows:

[0044] S1. Use ferric nitrate and polyvinylpyrrolidone as raw materials, mix according to the mass ratio of 1:4, then dissolve in deionized water, and react under magnetic stirring conditions at 100°C for 24 hours; then transfer the uniformly dispersed solution to hydrothermal reaction In the still, the carbonized melamine sponge is placed in the reaction kettle in advance (the treatment conditions of the melamine sponge are: argon-hydrogen mixed atmosphere, carbonization temperature 900°C, carbonization time 2h); The carbon-phosphorus-iron compound precursor was obtained by reacting for 24 hours; finally, the obtained carbon-phosphorus-iron compound precursor was carbonized in a tubular sintering furnace with a nitrogen atmosphere. The carbonization temperature was 900°C and the carbonization time was 2 hours. Finally...

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Abstract

The invention belongs to the technical field of metal lithium negative electrode materials for lithium ion batteries, and in particular relates to a skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and a preparation method and application thereof. The preparation method uses oxoacid iron salt, polyvinylpyrrolidone and carbonized melamine sponge as raw materials, and prepares carbon sponge-based Fe by low-temperature hydrothermal reaction and high-temperature carbonization reaction. 3 C‑Fe 3 P skeleton, with oxoacid aluminum salt as aluminum source, and high-temperature carbon thermal reaction with carbon source to obtain AlN ultrafine particles; finally, carbon sponge-based Fe 3 C‑Fe 3 The P skeleton and AlN ultrafine particles carry out amorphous modification on lithium metal to obtain the product. This method increases the internal defects of the lithium metal negative electrode and greatly suppresses the formation of lithium metal dendrites. Using the amorphous modified lithium metal as the negative electrode of the lithium ion battery can significantly enhance the cycle stability of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a skeleton-supported aluminum nitride amorphous modified lithium negative electrode material and a preparation method and application thereof. Background technique [0002] Electrochemical secondary batteries are one of the ways of grid energy storage. Among many electrochemical energy storage technologies, lithium-ion batteries are favored due to their high energy density and long cycle life. However, with the extensive use of lithium-ion batteries in power vehicles, the cost of lithium carbonate and transition metals such as nickel and cobalt will inevitably rise. Therefore, metal lithium with higher capacity and lower cost has become a better choice for lithium battery materials. At present, lithium batteries commercially produced with lithium metal mostly use organic liquid electrolytes. The electrolyte and electrode materials are prone to side reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/072C01B25/08C01B32/914H01M4/62H01M10/0525
CPCC01B21/072C01B25/08C01B32/914H01M4/628H01M10/0525C01P2004/01Y02E60/10
Inventor 王波袁飞张迪王秋君李文孙会兰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY