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Preparation method of spherical hollow lithium titanate/graphene composite material as lithium battery negative material

A technology of empty lithium titanate and graphene, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of decreased specific capacity, low ionic conductivity, low conductivity of lithium titanate, etc., to improve electrical conductivity, The effect of improving specific capacity and low preparation cost

Active Publication Date: 2015-05-13
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate has low conductivity and low ionic conductivity, so that its specific capacity decreases rapidly during high-current charging and discharging.
Although through research in recent years, the preparation of nanoscale lithium titanate has improved its rate performance, but it has not been fundamentally solved.

Method used

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  • Preparation method of spherical hollow lithium titanate/graphene composite material as lithium battery negative material
  • Preparation method of spherical hollow lithium titanate/graphene composite material as lithium battery negative material
  • Preparation method of spherical hollow lithium titanate/graphene composite material as lithium battery negative material

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Embodiment 1

[0029] 1. In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the examples.

[0030] Example 1

[0031] (1) Preparation of silica spheres:

[0032] Dissolve 1.6 mL of tetraethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia water in 44 mL of absolute ethanol to form solution B; dissolve 2 mL of tetraethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.

[0033] Add solution A and solution B into the three-necked flask, and start stirring at the same time. After reacting for 30 minutes, add 8 mL of ammonia water into the three-necked flask, and after reacting for 5-10 minutes, add solution C to the system, and continue the reaction for 2 minutes. h, performing repeated centrifugation and washing with water to obtain a solid phase, that is, silica spheres.

[0034] (2) Preparation of ...

Embodiment 2

[0042] (1) Preparation of silica spheres:

[0043] Dissolve 1.6 mL of tetraethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia water in 44 mL of absolute ethanol to form solution B; dissolve 2 mL of tetraethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.

[0044] Add solution A and solution B into the three-necked flask, and start stirring at the same time. After reacting for 30 minutes, add 8 mL of ammonia water into the three-necked flask, and after reacting for 5-10 minutes, add solution C to the system, and continue the reaction for 2 minutes. h, performing repeated centrifugation and washing with water to obtain a solid phase, that is, silica spheres.

[0045] (2) Preparation of silica titania:

[0046]Mix 0.1 g of hydroxypropyl cellulose, 60 mL of absolute ethanol and 0.6 mL of deionized water to form a mixed solution.

[0047] Take 0.2 g of silica spheres and ultrasonically disperse them ...

Embodiment 3

[0053] (1) Preparation of silica spheres:

[0054] Dissolve 1.6 mL of tetraethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia water in 44 mL of absolute ethanol to form solution B; dissolve 2 mL of tetraethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.

[0055] Add solution A and solution B into the three-necked flask, and start stirring at the same time. After reacting for 30 minutes, add 8 mL of ammonia water into the three-necked flask, and after reacting for 5-10 minutes, add solution C to the system, and continue the reaction for 2 minutes. h, performing repeated centrifugation and washing with water to obtain a solid phase, that is, silica spheres.

[0056] (2) Preparation of silica titania:

[0057] Mix 0.1 g of hydroxypropyl cellulose, 60 mL of absolute ethanol and 0.6 mL of deionized water to form a mixed solution.

[0058] 0.2 g of silica spheres were ultrasonically dispersed in the ...

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Abstract

The invention relates to a preparation method of a spherical hollow lithium titanate / graphene composite material as a lithium battery negative material, and belongs to the field of lithium battery negative materials. The preparation method comprises the following steps of: preparing the nuclear shell structure of silicon dioxide@titanium dioxide by a template method; then transforming titanium dioxide into lithium titanate through hydrothermal reaction by adopting lithium hydroxide as a lithium source, and removing internal silicon dioxide by virtue of the corrosion of lithium hydroxide to generate spherical hollow structural lithium titanate. Prepared spherical hollow lithium titanate belongs to a spinel type, is more uniform in structure, has good crystallinity, is internally provided with a hollow structure and has a great specific area, thus greatly enlarging the contact area between spherical hollow lithium titanate and electrolyte, being favorable to the extraction and insertion of Li<+> in charging and discharging processes and greatly improving the charging and discharging properties of a battery.

Description

technical field [0001] The invention belongs to the field of lithium battery negative electrode materials, in particular to a preparation method of spherical hollow lithium titanate and its composite material with graphene. Background technique [0002] At present, commercialized lithium batteries basically use carbon-based materials as negative electrodes, but the cycle performance and rate performance of carbon-based materials are not good enough, and safety issues and low power have become technical bottlenecks restricting their further development. [0003] Spinel lithium titanate Li 4 Ti 5 o 12 The theoretical specific capacity is 175 mAh / g, and the voltage platform is about 1.5 V. Lithium titanate negative electrode material has the advantages of rich raw material resources, low cost, good safety performance, no pollution, easy preparation, etc., and has a good application prospect. However, lithium titanate has low conductivity and low ionic conductivity, so that ...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362H01M4/485H01M4/583H01M10/0525Y02E60/10
Inventor 李娟刁国旺余洋童晶晶董书君王欢
Owner YANGZHOU UNIV
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