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High-performance positive electrode material, preparation method thereof, and application of positive electrode material in lithium ion battery

A technology of positive electrode materials and positive active materials, applied in the field of high-performance positive electrode materials and their preparation, can solve problems such as lattice interface damage, achieve improved ionic conductivity, improved electronic conductivity and rate performance, and high electrochemical performance Effect

Active Publication Date: 2020-05-08
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing methods such as carbon coating treatment, metal oxide modification, and metal ion doping have not fundamentally solved the problem of lattice interface damage.

Method used

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  • High-performance positive electrode material, preparation method thereof, and application of positive electrode material in lithium ion battery
  • High-performance positive electrode material, preparation method thereof, and application of positive electrode material in lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0080] In the positive electrode material described in this embodiment, based on the mass of the positive electrode material as 100%, the mass percentage of the first coating is 10%, and the mass percentage of the second coating is 0.05%;

[0081] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio of the conductive polymer, graphene and carbon nanotubes in the conductive polymer / graphene / carbon nanotube composite is 1:1.5:6.5;

[0082] The preparation method of described cathode material comprises the following steps:

[0083] (1) dissolving starch in isopropanol to obtain solution A;

[0084] (2) Add the first coating to the solution A obtained in step (1), stir well to obtain solution B;

[0085] (3) Ferric phosphate is added to solution B obtained in step (2), and sand-milled to a particle size of 250 nm to obtain slurry C;

[0086] (4) Spray-dry the slu...

Embodiment 2

[0091] In the positive electrode material described in this embodiment, based on the mass of the positive electrode material as 100%, the mass percentage of the first coating is 0.5%, and the mass percentage of the second coating is 10%;

[0092] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio is 7:2.5:0.5; the mass ratio of conductive polymer, graphene and carbon nanotubes in the conductive polymer / graphene / carbon nanotube composite is 0.2:3:8;

[0093] The preparation method of described cathode material comprises the following steps:

[0094] (1) Gum Arabic is dissolved in tetrahydrofuran to obtain solution A;

[0095] (2) Add the first coating to the solution A obtained in step (1), stir well to obtain solution B;

[0096] (3) Add ferromanganese phosphate into solution B obtained in step (2), and sand-mill until the particle size is 600nm to obtain sl...

Embodiment 3

[0102] In the positive electrode material described in this embodiment, based on the mass of the positive electrode material as 100%, the mass percentage of the first coating is 15%, and the mass percentage of the second coating is 0.1%;

[0103] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio is 9.4:0.5:0.1; the mass ratio of conductive polymer, graphene and carbon nanotube in the conductive polymer / graphene / carbon nanotube composite is 2:0.1:9.8;

[0104] The preparation method of described cathode material comprises the following steps:

[0105] (1) Dissolving hydroxyethyl cellulose in ethylene glycol to obtain solution A;

[0106] (2) Add the first coating to the solution A obtained in step (1), stir well to obtain solution B;

[0107] (3) adding vanadium phosphate to solution B obtained in step (2), and sanding until the particle size is 1000nm to ob...

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Abstract

The invention discloses a high-performance positive electrode material, a preparation method thereof and an application of the positive electrode material in a lithium ion battery. The positive electrode material comprises a phosphate-based positive electrode active substance and a composite coating layer coating the surface of the phosphate-based positive electrode active substance, wherein the composite coating layer comprises a first coating material and a second coating material; the first coating is of a three-dimensional nano-network layered structure and comprises a conductive polymer / graphene / carbon nanotube compound, a hydrogen-containing lithium titanium oxide compound and FeF3 (H2O) 0.33, the hydrogen-containing lithium titanium oxide compound and the FeF3 (H2O) 0.33 are dispersed on the surface of the compound in situ, and the second coating is amorphous carbon. In the preparation process of the high-performance positive electrode material, spray drying and heat treatment are combined, so the surface of the phosphate-series positive electrode active substance is uniformly coated with the first coating material with the three-dimensional nano-network layered structure and the amorphous carbon, and the obtained high-performance positive electrode material has the outstanding advantages of relatively high ionic conductivity and electronic conductivity, high specific discharge capacity, high initial coulombic efficiency, good cycling stability, high rate capability and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, in particular to the technical field of preparation of cathode materials for lithium-ion secondary batteries, and relates to a high-performance cathode material, a preparation method thereof and an application in lithium-ion batteries. Background technique [0002] With the increasingly prominent problems of global environmental pollution and energy shortage, lithium-ion batteries with outstanding advantages such as large discharge specific capacity, high voltage platform, safety, long life, and environmental friendliness are widely used in small portable batteries, power batteries for new energy vehicles, The application of various fields such as energy storage is becoming more and more extensive, and at the same time it has played a great role in the rapid development of national defense, industry and technology, and the improvement of people's livin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M4/62H01M10/0525C01B32/182
CPCC01B32/182H01M4/366H01M4/5825H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 谭强强徐宇兴
Owner LANGFANG GREEN IND TECH CENT
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