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Lithium germanate, lithium germanate/graphite composite negative electrode material and its preparation method and application in assembled lithium battery

A technology of negative electrode materials and composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in realization, performance deterioration, low specific capacity, etc., and achieve convenient operation, improved stability, and high specific capacity. Effect

Active Publication Date: 2022-03-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the theoretical specific capacity of graphite-based carbon negative electrode materials is relatively low; it cannot be well dissolved with other substances, and its performance will deteriorate under high-power discharge conditions
The biggest problem is that the lithium storage capacity of the carbon negative electrode has basically reached the limit. The capacity of the graphite carbon negative electrode material has reached 360mAh / g, which is close to the theoretical mass specific capacity of 372mAh / g. It is difficult to increase its space.

Method used

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  • Lithium germanate, lithium germanate/graphite composite negative electrode material and its preparation method and application in assembled lithium battery
  • Lithium germanate, lithium germanate/graphite composite negative electrode material and its preparation method and application in assembled lithium battery
  • Lithium germanate, lithium germanate/graphite composite negative electrode material and its preparation method and application in assembled lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A kind of preparation method of lithium germanate negative electrode material provided by the invention comprises the following steps:

[0065] (1) Mix 0.015mol of germanium dioxide and 0.015mol of lithium carbonate, the molar ratio of the germanium source to the lithium metal salt is 1:1 to obtain the mixed raw material, then add the mixed raw material into the ball mill tank, and then add 107.2 g stainless steel balls, the mass ratio of the stainless steel balls to the mixed raw material is 40:1 (ball-material ratio), and the ball milling process is carried out, the temperature of the ball milling process is room temperature, the rotating speed of the ball milling process is 300 rpm, and the time of the ball milling process is After 5 hours, the lithium germanate negative electrode material precursor was obtained;

[0066] The XRD pattern of the lithium germanate negative electrode material precursor is as follows figure 1 shown by figure 1 It can be seen that the l...

Embodiment 2

[0070] A kind of preparation method of lithium germanate negative electrode material provided by the invention comprises the following steps:

[0071] (1) Mix 0.015mol of germanium dioxide and 0.015mol of lithium carbonate, the molar ratio of the germanium source to the lithium metal salt is 1:1, to obtain the mixed raw material, then add the mixed raw material into the ball mill tank, and then add 53.6 g stainless steel balls, the mass ratio of the stainless steel balls to the mixed raw material is 20:1 (ball-material ratio), and the ball milling process is carried out, the temperature of the ball milling process is room temperature, the rotating speed of the ball milling process is 150 rpm, and the time of the ball milling process is In 2 hours, the lithium germanate negative electrode material precursor was obtained;

[0072] (2) Under an argon atmosphere, heat up the lithium germanate negative electrode material precursor described in step (1) in a tube furnace at a rate o...

Embodiment 3

[0075] A kind of preparation method of lithium germanate negative electrode material provided by the invention comprises the following steps:

[0076] (1) Mix 0.015mol of germanium dioxide and 0.015mol of lithium carbonate, the molar ratio of the germanium source to the lithium metal salt is 1:1, to obtain the mixed raw material, then add the mixed raw material into the ball mill tank, and then add 134g Stainless steel balls, the mass ratio of the stainless steel balls to the mixed raw material is 50:1 (ball-to-material ratio), ball milling is carried out, the temperature of the ball milling is 30°C, the rotating speed of the ball milling is 500 rpm, and the time of the ball milling is After 10 hours, the lithium germanate negative electrode material precursor was obtained;

[0077] (2) Under an argon atmosphere, heat up the lithium germanate negative electrode material precursor described in step (1) in a tube furnace at a heating rate of 10°C / min, and perform heat treatment ...

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Abstract

The invention discloses a lithium germanate, a lithium germanate / graphite composite negative electrode material, a preparation method thereof and an application in assembling lithium batteries. The method adopts simple ball milling and heat treatment processes to obtain lithium germanate and lithium germanate / graphite negative electrode materials. The method comprises the following steps: putting germanium source and lithium metal salt (carbon source is added when preparing lithium germanate / graphite composite material) into a ball milling tank for ball milling; after the ball milling product is heat-treated, lithium germanate and lithium germanate can be obtained / Graphite anode material. The preparation method provided by the invention has the advantages of simple process, convenient operation, no pollution in the preparation process, easy availability of raw materials and excellent lithium storage performance of the product, and has potential industrial production value.

Description

technical field [0001] The invention belongs to the field of negative electrode materials, and in particular relates to a lithium germanate, lithium germanate / graphite composite negative electrode material, a preparation method thereof, and an application in assembling lithium batteries. Background technique [0002] With the consumption of non-renewable energy and the increasingly prominent global energy problems, the development and utilization of renewable energy has become the focus of attention of countries all over the world. However, since the generation of renewable energy (such as solar energy, wind energy, tidal energy, and geothermal energy) is usually intermittent, efficient storage and utilization of these energies has become a research hotspot. Electrochemical energy storage and conversion systems can provide effective solutions for global green and sustainable energy and play an important role in our daily life. Due to its high voltage, large capacity, no mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 刘军王心怡沈家东许希军朱敏
Owner SOUTH CHINA UNIV OF TECH
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