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Preparation method of cobalt lithium silicate anode material for lithium ion battery

A lithium ion battery, lithium cobalt silicate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of poor electrochemical performance of silicate cathode materials, unsuitable for large-scale industrial production, and silicate cathodes. The problem of poor reproducibility of materials can achieve the effect of high practical use value, good electrochemical performance and controllable morphology.

Inactive Publication Date: 2011-12-14
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This high-temperature solid-phase reaction synthesis process is under the protection of an inert gas, and is sintered at a high temperature of 700 ° C to 900 ° C to realize the preparation of silicate cathode materials. Since this synthesis process requires the protection of an inert gas, it maintains a high temperature. The environment of pure inert gas is relatively difficult, which will lead to lower purity of the prepared silicate cathode material; on the other hand, if the inert gas is mixed with air, the performance of the prepared silicate cathode material is very poor, Even the required silicate cathode material may not be obtained, resulting in poor reproducibility of the silicate cathode material; in addition, since this synthesis process is sintered at a high temperature of 700 ° C to 900 ° C to synthesize silicate Therefore, the particles of the prepared silicate cathode material are large and uneven, and the particle size of the general particle is about 1 μm to 10 μm, which leads to poor electrochemical performance of the prepared silicate cathode material ; In summary, this synthesis process is not suitable for large-scale industrial production

Method used

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  • Preparation method of cobalt lithium silicate anode material for lithium ion battery
  • Preparation method of cobalt lithium silicate anode material for lithium ion battery
  • Preparation method of cobalt lithium silicate anode material for lithium ion battery

Examples

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Embodiment 1

[0022] The present invention proposes a method for preparing a lithium cobalt silicate positive electrode material for lithium ion batteries, which is to prepare the lithium cobalt silicate positive electrode material at a low temperature (120-200°C) liquid phase by using the existing ion thermal synthesis method Specifically, it includes the following steps: ① adding 0.02 mol of lithium hydroxide to 100 ml of imidazole ionic liquid, and then stirring; ② adding 0.01 mol of silicon dioxide with a particle size of 1 μm after stirring for 30 minutes, and continuing to stir; ③After stirring for 5 hours, add 0.01mol of cobalt acetate, and continue to stir for 2 hours, so that lithium hydroxide, silicon dioxide, and cobalt acetate are evenly mixed in the imidazole ionic liquid; ④Pour the mixed substance obtained after uniform mixing into high pressure In the reaction kettle, react at a reaction temperature of 200 ° C for 2 days; ⑤ After the autoclave is naturally cooled to room tempe...

Embodiment 2

[0030] The process of preparing lithium cobalt silicate cathode material in this example is as follows: ①Add 0.05mol of lithium hydroxide to 100ml of imidazole-based ionic liquid, and then stir; ②Add 0.01mol of lithium hydroxide with a particle size of 10μm after stirring for 20 minutes Silicon dioxide, continue to stir; ③ after stirring for 7 hours, then add 0.01mol of cobalt acetate, and continue to stir for 1 hour, so that lithium hydroxide, silicon dioxide, and cobalt acetate are evenly mixed in the imidazole ionic liquid; The mixed substance obtained after mixing is poured into the autoclave, and reacted for 7 days at a reaction temperature of 150 ° C; ⑤ After the autoclave is naturally cooled to room temperature, take out the product in the autoclave; ⑥ Use distilled water or / and ethanol Wash the product several times; ⑦Put the cleaned product in an oven and dry it at a temperature of 80°C. The powder obtained after drying is the lithium cobalt silicate cathode material. ...

Embodiment 3

[0034] The process of preparing lithium cobalt silicate cathode material in this example is as follows: ①Add 0.04mol of lithium hydroxide to 100ml of imidazole ionic liquid, and then stir; ②Add 0.01mol of lithium hydroxide with a particle size of 10nm after stirring for 50 minutes. Silica, continue to stir; ③ After stirring for 2 hours, then add 0.01mol of cobalt acetate, and continue to stir for 5 hours, so that lithium hydroxide, silicon dioxide, and cobalt acetate are evenly mixed in the imidazole ionic liquid; ④ Mix evenly Pour the obtained mixture into the autoclave and react for 5 days at a reaction temperature of 120°C; ⑤After the autoclave is naturally cooled to room temperature, take out the product in the autoclave; ⑥Wash with distilled water or / and ethanol The product is produced many times; ⑦Put the cleaned product into an oven and dry it at a temperature of 100°C. The powder obtained after drying is the lithium cobalt silicate cathode material.

[0035] In this sp...

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Abstract

The invention discloses a preparation method of a cobalt lithium silicate anode material for a lithium ion battery, comprising the following steps of: adding lithium hydroxide to imidazole type ion liquid, adding silicon dioxide to the mixture after stirring the mixture for 20-50min, adding cobaltous acetate to the mixture after stirring for 2-7h, and stirring again for 1-5h to uniformly mix the mixture; pouring the mixture into a high-pressure reaction kettle to make the mixture react for 5 hours to 7 days at 120-200 DEG C, and taking out products after the high-pressure reaction kettle is naturally cooled to room temperature; cleaning the products by distilled water or / and ethanol; putting the cleaned products into an oven for drying at 80-100 DEG C to obtain the cobalt lithium silicateanode material. The invention has the advantage that the method does not need the protection of inert gas and a sintering technique, thus the operation is more simply and convenient, and the preparedanode material has high purity and repeatability. In addition, the invention can realize the controllability of the phase and the appearance of the anode material and can ensure that the prepared anode material has better electrochemistry property.

Description

technical field [0001] The invention relates to a preparation process of a positive electrode material of a lithium ion battery, in particular to a preparation method of a lithium cobalt silicate positive electrode material used in a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various fields of society as an efficient energy storage device, such as communication tools, electric equipment, and hybrid vehicles. However, lithium-ion batteries have been made of lithium cobalt oxide (LiCoO 2 ) positive electrode material, the actual usable capacity of this type of lithium cobalt oxide positive electrode material is only 135mAh / g, which leads to the capacity development of lithium ion batteries can not keep up with the progress of science and technology development, therefore, it is necessary to find new positive electrode materials to Improve the energy storage characteristics of the battery. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/58C01B33/20
CPCY02E60/122Y02E60/10
Inventor 徐锦锦舒杰水淼任元龙黄锋涛徐丹崔佳侯璐
Owner NINGBO UNIV
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