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Method for preparing lithium-zinc titanate/carbon nano composite negative electrode material

A carbon nanocomposite, lithium zinc titanate technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low conductivity, poor high rate performance, restrictions on promotion and application, etc., and achieve uniform particle size distribution , high rate performance, and good cycle performance

Inactive Publication Date: 2016-04-20
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 2 ZnTi 3 o 8 The low conductivity of the material leads to poor high-rate performance, which greatly restricts its promotion and application, especially in the field of power batteries, which has attracted worldwide attention. The high-rate working characteristics of the material determine whether it can be commercially applied on a large scale. One of the key factors, so increasing the Li 2 ZnTi 3 o 8 The high rate performance has become one of the core topics that researchers are concerned about

Method used

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  • Method for preparing lithium-zinc titanate/carbon nano composite negative electrode material
  • Method for preparing lithium-zinc titanate/carbon nano composite negative electrode material
  • Method for preparing lithium-zinc titanate/carbon nano composite negative electrode material

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Embodiment 1

[0019] Li 2 ZnTi 3 o 8 Preparation of Nanoscale Anode Materials

[0020] Weigh 0.04mol of lithium acetate dihydrate and 0.02mol of zinc acetate dihydrate, add them to 200ml of absolute ethanol successively, stir magnetically until completely dissolved, and form a colorless solution; add 0.06mol of nano-titanium dioxide, sonicate for 20min, and stir for 1h at 25°C , to obtain a suspension; the suspension was evaporated to dryness in an oil bath at 80°C, and then vacuum-dried at 100°C to obtain a lithium zinc titanate precursor; Heat treatment for 10h. The sample is named: LZTO-0.

Embodiment 2

[0022] Li 2 ZnTi 3 o 8 / C composite anode material preparation

[0023] Weigh 0.04mol of lithium acetate dihydrate, 0.02mol of zinc acetate dihydrate and 0.5g of phenolic resin, add them to 200ml of absolute ethanol successively, stir magnetically until completely dissolved, and form a yellow solution; add 0.06mol of nano-titanium dioxide, ultrasonic 20min, 25 Stir at ℃ for 1 h to obtain a suspension; evaporate the suspension to dryness in an oil bath at 80 °C, and then dry it in vacuum at 100 °C to obtain a precursor of lithium zinc titanate / carbon composite material; the lithium zinc titanate / carbon The composite material precursor was heat-treated at 700 °C for 10 h in an argon atmosphere. Through elemental analysis, the carbon content in the obtained lithium zinc titanate / carbon composite material is 4.3%. The sample is named: LZTO-1.

Embodiment 3

[0025] Li 2 ZnTi 3 o 8 / C composite anode material preparation

[0026] Weigh 0.04mol of lithium acetate dihydrate, 0.02mol of zinc acetate dihydrate and 0.7g of phenolic resin, add them to 200ml of absolute ethanol successively, stir magnetically until completely dissolved, and form a yellow solution; add 0.06mol of nano-titanium dioxide, ultrasonic for 20min, Stir at ℃ for 1 h to obtain a suspension; evaporate the suspension to dryness in an oil bath at 80 °C, and then dry it in vacuum at 100 °C to obtain a precursor of lithium zinc titanate / carbon composite material; the lithium zinc titanate / carbon The composite material precursor was heat-treated at 700 °C for 10 h in an argon atmosphere. Through elemental analysis, the carbon content in the obtained lithium zinc titanate / carbon composite material is 6.0%. The sample is named: LZTO-2.

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Abstract

The invention relates to the technical field of lithium-ion battery manufacturing and particularly relates to a method for preparing a lithium-zinc titanate / carbon nano composite negative material. The method comprises the steps: firstly, dissolving lithium acetate, zinc acetate and a carbon source in anhydrous ethanol, then, adding nano-titania into the anhydrous ethanol, and carrying out uniform dispersing, so as to obtain a suspension liquid; evaporating the suspension liquid to dryness in oil bath, carrying out vacuum drying, and carrying out thorough heat treatment in a protective gas atmosphere, thereby obtaining a target product, i.e., the lithium-zinc titanate / carbon composite cathode material. According to the method, the process for preparing the lithium-zinc titanate / carbon composite cathode material is simple and safe and is low in cost, and the prepared lithium-zinc titanate / carbon composite cathode material has the particle size of nanometer and has relatively high charging and discharging capacity and good rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacture, in particular to a method for preparing lithium zinc titanate / carbon nanometer composite negative electrode material. Background technique [0002] Due to the advantages of high specific energy, low self-discharge, long cycle life, no memory effect and low environmental pollution, lithium-ion batteries have been widely used in small portable power equipment, electric vehicles and hybrid electric vehicles. At present, the negative electrode material of commercialized lithium-ion batteries is mainly carbon, but the potential of the carbon negative electrode is very close to that of lithium. When the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode, causing safety problems. Therefore, a large number of researchers have begun to devote themselves to the development of new anode materials. Spinel lithium titanate (Li 4 Ti 5 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525
CPCH01M4/364H01M4/485H01M4/587H01M10/0525Y02E60/10
Inventor 任玉荣卢鹏丁建宁黄小兵
Owner CHANGZHOU UNIV
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