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A kind of tio2/c coated graphite composite material, preparation method and its application as lithium-ion battery negative electrode material

A composite material and graphite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as insignificant effects and unimproved rate performance, and achieve improved transmission capacity, improved gram capacity and electrical conductivity, and improved Effect of contact area

Active Publication Date: 2018-12-07
JIAOZUO JUNENG ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technical solution discloses that expanded graphite embedded with metal nanoparticles is used as the negative electrode active material of lithium ion batteries. Although the gram capacity and cycle performance have been improved, the effect is not obvious, and the rate performance has not been improved at the same time.

Method used

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  • A kind of tio2/c coated graphite composite material, preparation method and its application as lithium-ion battery negative electrode material
  • A kind of tio2/c coated graphite composite material, preparation method and its application as lithium-ion battery negative electrode material
  • A kind of tio2/c coated graphite composite material, preparation method and its application as lithium-ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] TiO in this example 2 / C coated graphite composite material, the composite material is a core-shell structure, its inner core is nano-silver doped graphite material, in the nano-silver doped graphite material, the mass ratio of graphite to nano-silver is 88:2; its shell is mainly composed of TiO 2 Coating formed by compounding with pitch pyrolytic carbon, TiO 2 The mass ratio of pitch to pitch pyrocarbon is 5:30; the cladding layer accounts for 7.2% by mass of the core-shell structure.

[0036] TiO in this example 2 The preparation method of C coated graphite composite material comprises the following steps:

[0037] 1) Prepare nano-silver doped graphite material by vacuum coating method, specifically:

[0038] a. 100g flake graphite is compressed into a flake structure by a tablet press to obtain a graphite matrix;

[0039] b. Place the graphite substrate in the vacuum chamber of the vacuum coating machine, conduct resistance heating through the resistance rod in ...

Embodiment 2

[0044] TiO in this example 2 / C coated graphite composite material, the composite material is a core-shell structure, its inner core is nano-aluminum doped graphite material, in the nano-aluminum doped graphite material, the mass ratio of graphite to nano-aluminum is 95:3; its shell is mainly composed of TiO 2 Coating formed by compounding with pitch pyrolytic carbon, TiO 2 The mass ratio of pitch to pitch pyrocarbon is 1:10; the cladding layer accounts for 2% by mass of the core-shell structure.

[0045] TiO in this example 2 The preparation method of C coated graphite composite material comprises the following steps:

[0046] 1) Prepare nano-aluminum doped graphite material by vacuum coating method, specifically:

[0047] a. 100g flake graphite is compressed into a flake structure by a tablet press to obtain a graphite matrix;

[0048] b. Place the graphite substrate in the vacuum chamber of the vacuum coating machine, conduct resistance heating through the resistance r...

Embodiment 3

[0053] TiO in this example 2 / C coated graphite composite material, the composite material is a core-shell structure, and its core is a nano-chromium-nickel-tin-doped graphite material, and in the nano-chromium-nickel-tin-doped graphite material, the mass ratio of graphite to nano-chromium-nickel-tin is 85:1; its shell is mainly composed of TiO 2 Coating formed by compounding with pitch pyrolytic carbon, TiO 2 The mass ratio of pitch to pitch pyrocarbon is 10:50; the cladding layer accounts for 14% by mass of the core-shell structure.

[0054] TiO in this example 2 The preparation method of C coated graphite composite material comprises the following steps:

[0055] 1) Prepare nano-chromium-nickel-tin-doped graphite material by vacuum coating method, specifically:

[0056] a. 100g flake graphite is compressed into a flake structure by a tablet press to obtain a graphite matrix;

[0057] b. Place the graphite substrate in the vacuum chamber of the vacuum coating machine, a...

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Abstract

The invention discloses a TiO2 / C coated graphite composite material, a preparation method and application thereof as a lithium ion battery negative electrode material. The composite material is a core-shell structure, the core is a nano-metal doped graphite material, and the mass ratio of graphite to nano-metal is 85-95:1-3, the shell is a coating layer mainly formed by compounding of TiO2 and asphalt pyrolytic carbon, and the mass ratio of TiO2 to asphalt forming the asphalt pyrolytic carbon is 1-10:10-50, and the coating layer accounts for 2%-14% of the mass of the core-shell structure. The core of the composite material has a metal embedded network structure, thus improving the gram capacity and conductivity of the negative electrode material. The coating layer formed by compounding of TiO2 and asphalt pyrolytic carbon has the characteristics of high conductivity, good compatibility with electrolyte solution and the like, thus improving the multiplying power and cycle performance of the composite material. Being used as a lithium ion battery negative electrode material, the TiO2 / C coated graphite composite material enhances the energy density, high rate performance and cycling performance of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a TiO 2 / C coated graphite composites, also involving a TiO 2 Preparation method of / C coated graphite composite material and its application as lithium ion battery negative electrode material. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly graphite materials. All directly affect the development process of lithium-ion batteries in the field of power and energy storage batteries. For example, graphite materials have high activity, that is, poor compatibility with electrolytes. At present, graphite materials mainly improve the compatibility of negative electrode materials and electrolytes through surface coating modification, and improve the cycle and rate of materials. Graphitized carbon materials have a good layered structure, which is very suitable for the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 和百正和明刚和喆郭爱霞
Owner JIAOZUO JUNENG ENERGY TECH
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