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High-rate anti-expansion lithium titanate material and preparation method thereof

A gas lithium titanate, high-rate technology, applied in the field of high-rate anti-flatulence lithium titanate materials and its preparation, can solve the problems of lithium titanate rate and flatulence at the same time, and achieve low cost and high lithium ion migration rate , the effect of reducing gas production

Pending Publication Date: 2018-07-20
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a high-rate anti-flatulence lithium titanate material and its preparation method, which solves the problem that existing materials cannot simultaneously solve the problem of lithium titanate rate and flatulence

Method used

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  • High-rate anti-expansion lithium titanate material and preparation method thereof
  • High-rate anti-expansion lithium titanate material and preparation method thereof
  • High-rate anti-expansion lithium titanate material and preparation method thereof

Examples

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Embodiment 1

[0025] The preparation method of the high-magnification anti-flatulence lithium titanate material in this embodiment, the specific steps are as follows:

[0026] (1) One-step preparation of carbon-coated lithium titanate (LTO@C)

[0027] Weigh titanium dioxide, lithium carbonate and glucose according to the mass ratio of 1:0.37:0.14, mix with 1% polyvinylpyrrolidone solution to obtain a uniform slurry, dry at 80°C, and roast at 600°C for 12h under the protection of argon to obtain the LTO@C material.

[0028] (2) Preparation of lithium fluoride carbon co-coated lithium titanate material (LTO@C@LiF)

[0029] Weigh 1g of LTO@C, add 10g of water and ultrasonically disperse evenly, weigh 0.0427g of lithium carbonate and add it under mechanical stirring conditions, then weigh 0.0428g of ammonium fluoride and dissolve it in the beaker, add it dropwise to the above suspension, stir , in a water bath at 80°C, and dried to obtain the LTO@C@LiF precursor, which was calcined in argon at...

Embodiment 2

[0031] The preparation method of the high-magnification anti-flatulence lithium titanate material in this embodiment, the specific steps are as follows:

[0032] (1) One-step preparation of carbon-coated lithium titanate (LTO@C)

[0033] Weigh titanium dioxide, lithium carbonate and glucose according to the mass ratio of 1:0.37:0.20, mix them with 0.5% polyvinylpyrrolidone solution to obtain a uniform slurry, dry at 80°C, and roast at 700°C for 15 hours under the protection of nitrogen to obtain LTO@C materials.

[0034] (2) Preparation of lithium fluoride carbon co-coated lithium titanate material (LTO@C@LiF)

[0035] Weigh 1g of LTO@C, add 10g of water and ultrasonically disperse evenly, weigh 0.0641g of lithium carbonate and add it under mechanical stirring conditions, then weigh 0.0642g of ammonium fluoride and dissolve it in the beaker, add it dropwise to the above suspension, stir , in a water bath at 80°C, evaporated until the solution was evaporated to dryness, and dr...

Embodiment 3

[0037] The preparation method of the high-magnification anti-flatulence lithium titanate material in this embodiment, the specific steps are as follows:

[0038] (1) One-step preparation of carbon-coated lithium titanate (LTO@C)

[0039] According to the mass ratio of 1:0.38:0.16, titanium dioxide, lithium carbonate and sucrose were weighed and mixed, 1.5% polystyrene solution was added to mix to obtain a uniform slurry, dried at 80°C, and calcined at 800°C for 10 h under the protection of helium to obtain LTO@C materials.

[0040] (2) Preparation of lithium fluoride carbon co-coated lithium titanate material (LTO@C@LiF)

[0041]Weigh 1g of LTO@C, add 15g of ethanol to ultrasonically disperse evenly, weigh 0.0185g of lithium hydroxide and add it under mechanical stirring conditions, then weigh 0.0285g of ammonium fluoride and dissolve it in a beaker, and add it dropwise to the above suspension. Stir, 80 ℃ water bath, evaporate until the solution is evaporated to dryness, and ...

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Abstract

The invention provides a high-rate anti-expansion lithium titanate material and a preparation method thereof. The preparation method comprises the following steps of (1) preparation of LTO@C: performing mixing on a proper amount of titanium dioxide, lithium carbonate and a carbon source, then adding a dispersion medium I to be mixed to obtain uniform paste, and performing drying and roasting to obtain a LTO@C material; and (2) preparation of LTO@C@LiF: performing uniform mixing on LTO@C, a lithium source and a fluoride in a dispersion medium II and then performing drying and roasting to obtaina LTO@C@LiF material. The surface of lithium titanate is coated with carbon to form a uniformly coated conductive carbon layer, so that the electronic conductivity of the lithium titanate material isimproved; lithium fluoride has stable chemical property and relatively high lithium ion mobility rate; and by virtue of dual coating of carbon and lithium fluoride, a stable protection film is formed, thereby preventing occurrence of a secondary reaction.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a high-rate anti-flatulence lithium titanate material and a preparation method thereof. Background technique [0002] With the aggravation of global energy crisis and environmental pollution, the development and application of new energy is imperative. Lithium-ion batteries have developed rapidly since they were commercialized in the 1990s. Compared with traditional chemical batteries, it has the advantages of light weight, small size, high voltage, high specific energy, wide operating temperature range, high specific power, stable discharge, long storage time, no memory effect, and no pollution. At present, lithium-ion batteries have been widely used in portable electronic products such as mobile phones, digital cameras, and notebook computers, and have shown broad application prospects in electric vehicles (EV), hybrid electric ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/58H01M4/36H01M10/0525
CPCH01M4/366H01M4/485H01M4/582H01M10/0525Y02E60/10
Inventor 刘艳侠张锁江张鹏飞柴丰涛赵冲冲张若涛
Owner 郑州中科新兴产业技术研究院
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