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Modified Li4Ti5O12 anode material and preparation method and application thereof

A negative electrode material and modification technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reducing the tap density of materials and reducing the volume specific energy, and achieve the effects of improving electrical conductivity, good crystallization, and easy operation.

Inactive Publication Date: 2017-08-22
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although carbon coating can improve the conductivity of electrode materials, too much carbon content will reduce the tap density of the material, resulting in a decrease in volume specific energy. Carbon-coated Li 4 Ti 5 o 12 The rate performance and cycle stability of the material still need to be further strengthened and improved.

Method used

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  • Modified Li4Ti5O12 anode material and preparation method and application thereof
  • Modified Li4Ti5O12 anode material and preparation method and application thereof
  • Modified Li4Ti5O12 anode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Weigh a certain amount of lithium acetate (5% excess) (Lithium acetate), nano titanium dioxide (Titanium oxide) and a little sucrose (final carbon content about 5wt%) (Sucrose) and silver nitrate (final silver Content of about 5wt%) (Silver nitrate) was dissolved in the prepared 30ml dispersion liquid, wherein, the dispersion liquid contained 0.05g carboxymethylcellulose (CMC), 3 drops of styrene-butadiene rubber (SBR) and 0.1154g polyethylene glycol 400 (PEG400). Then ball milled in agate jar for 10h. Then spray drying (180°C, 3R / min, 60HZ) to obtain a powder, and the obtained dry powder was calcined at 850°C for 12h under an argon atmosphere (heating rate 5°C / min) to finally obtain Li 4 Ti 5 o 12 / C-Ag material.

Embodiment 2

[0055] Weigh a certain amount of lithium acetate (5% excess) (Lithium acetate), nano titanium dioxide (Titanium oxide) and a little sucrose (final carbon content about 5wt%) (Sucrose) and copper sulfate (final copper content about 5wt%) (Copper sulfate) was dissolved in the prepared 30ml dispersion liquid, wherein, the dispersion liquid contained 0.05g carboxymethylcellulose (CMC), 3 drops of styrene-butadiene rubber (SBR) and 0.1154g polyethylene glycol 400 (PEG400). Then ball milled in agate jar for 10h. Then spray drying (180°C, 3R / min, 60HZ) to obtain a powder, and the obtained dry powder was calcined at 850°C for 12h under an argon atmosphere (heating rate 5°C / min) to finally obtain Li 4 Ti 5 o 12 / C-Cu material.

Embodiment 3

[0057] A certain amount of lithium carbonate (excess 5%) and nano-titanium dioxide were weighed respectively, wherein the molar ratio of lithium ions to titanium ions was 0.7:1. Weigh again a little glucose (final carbon content 5wt%) and silver nitrate (final silver content 6wt%) and dissolve in the 30ml dispersion liquid that configures, and wherein, dispersion liquid contains 0.06g sodium carboxymethylcellulose, 3 drops of butylbenzene rubber and 0.1158 g polyethylene glycol 400 (PEG400). Then ball milled in agate jar for 8h. Then spray drying (180°C, 3R / min, 60HZ) to obtain a powder, and the obtained dry powder was calcined at 850°C for 15h under a nitrogen atmosphere (heating rate 5°C / min) to finally obtain Li 4 Ti 5 o 12 / C-Ag material. Example 4

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Abstract

The invention provides a modified Li4Ti5O12 anode material and a preparation method and application thereof. The preparation method comprises the following steps: adding lithium salt, a titanium source, a carbon source and metal salt into a dispersion liquid, dispersing and drying to obtain powder, and carrying out high temperature solid phase synthesis on the powder to obtain the modified Li4Ti5O12 anode material. The modified Li4Ti5O12 anode material can be applied in the preparation of batteries. The modified Li4Ti5O12 anode material can achieve carbon-metal coating of a Li4Ti5O12 material. The composite material has complete diffraction fringe and good crystallization. Particle size distribution is uniform. Degree of sphericity is high. Conductivity of the composite material can be effectively enhanced. Therefore, electrochemical performance is improved. In addition, rate performance of the material is raised, and cycling stability is greatly improved. The preparation method of the modified Li4Ti5O12 anode material is simple; the production process is simple; the preparation is easy to operate; and the production cost is low. The preparation method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to modified Li 4 Ti 5 o 12 Negative electrode material and its preparation method and application. Background technique [0002] With the rapid development of the global economy, fossil fuels such as coal, oil, and natural gas, which are the main energy sources, are increasingly depleted, and environmental pollution continues to intensify. The development of new energy and renewable clean energy has become a top priority. Among many new energy technologies, energy storage has become the most critical link. Although the power lithium-ion battery is not a system for generating energy, it is playing an increasingly important role in the national economy and daily life because of its advantages such as cleanliness, safety and convenience. [0003] Compared with commercial lithium intercalation carbon, Li 4 Ti 5 o 12 The negative electrode material has small crystal volum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/485H01M4/62H01M4/625H01M4/626Y02E60/10
Inventor 路密
Owner XIAMEN UNIV OF TECH