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A kind of phosphate-based composite cathode material and its preparation method and application

A technology of composite cathode material and cathode material, applied in the field of electrochemical power supply material preparation, can solve problems such as lattice interface damage of phosphate-based cathode material, achieve high energy density and safety performance, high rate discharge, and excellent cycle life. Effect

Active Publication Date: 2021-09-17
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above methods have improved the electrochemical performance of phosphate-based cathode materials to a certain extent, the existing carbon coating treatment and nanonization methods still have not fundamentally solved the problem of lattice interface damage of phosphate-based cathode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Preparation of nitrogen-doped titanium oxide

[0065] React nano-metitatanic acid and thiourea under a pressure of 1 MPa and airtight conditions, wherein the mass ratio of nano-metitanic acid and thiourea is 1:0.5, the reaction temperature is 100°C, the reaction time is 72h, and naturally cool after the reaction , washing, and drying, and heat-treating the dried product at 550° C. for 30 h in an argon atmosphere to obtain nitrogen-doped titanium oxide.

[0066] (2) Preparation of phosphorus-doped graphene

[0067] Mix phosphazene trichloride and graphene with a mass ratio of 0.01:1, react at a reaction pressure of 1 MPa and under airtight conditions, the reaction temperature is 100°C, and the reaction time is 36h. After the reaction is completed, it is naturally cooled, washed, and dried. A phosphorus-doped graphene precursor is obtained, and the dried phosphorus-doped graphene precursor is heat-treated at 1000° C. for 1 hour, cooled naturally, washed, and dried at...

Embodiment 2

[0073] (1) Preparation of nitrogen-doped titanium oxide

[0074] React titanium dioxide nanowires and amino acids under airtight conditions with a pressure of 30 MPa, wherein the mass ratio of titanium dioxide nanowires and amino acids is 1:2, the reaction temperature is 280°C, and the reaction time is 1h. After the reaction is completed, naturally cool, wash, and dry , heat-treating the dried product at 1100° C. for 1 h in a nitrogen atmosphere to obtain nitrogen-doped titanium oxide.

[0075] (2) Preparation of phosphorus-doped graphene

[0076] Mix adenosine triphosphate and graphene with a mass ratio of 0.05:1, react at a reaction pressure of 15MPa and under airtight conditions, the reaction temperature is 300°C, and the reaction time is 1h. After the reaction is completed, naturally cool, wash, and dry to obtain phosphorus-doped graphite ene precursor, the dried phosphorus-doped graphene precursor was heat-treated at 500°C for 30h, cooled naturally, washed, and dried at ...

Embodiment 3

[0082] (1) Preparation of nitrogen-doped titanium oxide

[0083] React titanium dioxide nanorods and polypyrrole under airtight conditions with a pressure of 20 MPa, wherein the mass ratio of titanium dioxide nanorods and polypyrrole is 1:1, the reaction temperature is 150 ° C, and the reaction time is 40 h. After the reaction, naturally cool and wash , drying, and heat-treating the dried product at 1000° C. for 2 hours in a nitrogen atmosphere to obtain nitrogen-doped titanium oxide.

[0084] (2) Preparation of phosphorus-doped graphene

[0085] Mix phosphoenonepyruvate and graphene with a mass ratio of 0.1:1, react under a reaction pressure of 5 MPa and under airtight conditions, the reaction temperature is 120°C, and the reaction time is 26h. After the reaction is completed, naturally cool, wash, and dry. The phosphorus-doped graphene precursor was obtained, and the dried phosphorus-doped graphene precursor was heat-treated at 600° C. for 20 hours, cooled naturally, washed...

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Abstract

The invention relates to a phosphate-based composite positive electrode material and its preparation method and application. The composite positive electrode material has a core-shell structure, the inner core is a phosphate-based lithium ion battery positive electrode material doped with metal oxide, and the outer shell is made of nitrogen A coating layer composed of doped titanium oxide, composite carbon material and transition metal oxide lithium cathode material. In the present invention, by designing a coating layer composed of nitrogen-doped titanium oxide, composite carbon material and transition metal oxide lithium positive electrode material, the transition metal and carbon on the surface of the phosphate-based positive electrode material can be coordinated through the X-C bond , so that carbon can be stably coated on the surface of the positive electrode material. This structure can repair the lattice interface, enhance the cycle life and cycle stability of the positive electrode material, and improve the electrochemical performance of the material. Its initial discharge specific capacity at 8C rate is >152mAh / g, and the capacity retention rate after 1500 cycles is >95%. It has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, and in particular relates to a phosphate-based composite positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large discharge specific capacity, high voltage platform, safety, long life, and environmental friendliness. At present, they are widely used in various fields such as small portable batteries, power batteries for new energy vehicles, and energy storage. The cathode material, which accounts for about 35% of the cost of lithium-ion batteries, is the core technology for the replacement of lithium-ion batteries and the key to the promotion of new energy vehicles. In-depth research on cathode materials for lithium-ion batteries has important practical significance. [0003] Phosphate-based lithium-ion battery cathode materials have achi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 谭强强徐宇兴
Owner LANGFANG GREEN IND TECH CENT
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