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A kind of preparation method of spherical hollow lithium titanate/graphene composite material as negative electrode material of lithium battery

A technology of empty lithium titanate and graphene, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of low ion conductivity, decreased specific capacity, and low conductivity of lithium titanate, so as to improve specific capacity, Improved electrical conductivity and low production cost

Active Publication Date: 2017-02-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of spherical hollow lithium titanate/graphene composite material as negative electrode material of lithium battery
  • A kind of preparation method of spherical hollow lithium titanate/graphene composite material as negative electrode material of lithium battery
  • A kind of preparation method of spherical hollow lithium titanate/graphene composite material as negative electrode material of lithium battery

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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 to 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@titanium dioxide:

[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 t...

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@titanium dioxide:

[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 i...

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Abstract

A method for preparing a spherical hollow lithium titanate / graphene composite material as a negative electrode material for a lithium battery belongs to the field of negative electrode materials for a lithium battery. The invention uses a template method to prepare a core-shell structure of silicon dioxide@titanium dioxide, and then uses lithium hydroxide as the The lithium source converts titanium dioxide into lithium titanate through hydrothermal reaction, and at the same time removes the inner silicon dioxide corrosively by means of lithium hydroxide to generate lithium titanate with a spherical hollow structure. The spherical hollow lithium titanate produced belongs to the spinel type, the structure is relatively uniform, the crystallinity is good, the interior has a hollow structure, and has a large specific surface area, which greatly increases its contact area with the electrolyte, which is beneficial to the charging and discharging process. The de-intercalation of Li+ greatly improves the charging and discharging performance of the 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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Patent Type & Authority Patents(China)
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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