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Preparation method of silicate positive electrode material for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of poor electrochemical performance of silicate positive electrode materials, uneven particles of silicate positive electrode materials, and unsuitability for large-scale Industrial production and other issues, to achieve high practical value, good electrochemical performance, and high reproducibility

Inactive Publication Date: 2010-12-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, various silicate cathode materials are mainly synthesized by high-temperature solid-state reaction method. This synthesis process is sintered at a high temperature of 700°C to 900°C for multiple times under the protection of an inert gas to realize the synthesis of silicate cathode materials. Therefore, the particles of the prepared silicate cathode material are not uniform, resulting in poor electrochemical performance of the prepared silicate cathode material; on the other hand, this synthesis process requires multiple sintering, And it needs to be sintered at high temperature, the process is complex, and the cost of energy consumption is high; in summary, this synthesis process is not suitable for large-scale industrial production

Method used

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  • Preparation method of silicate positive electrode material for lithium ion battery
  • Preparation method of silicate positive electrode material for lithium ion battery
  • Preparation method of silicate positive electrode material for lithium ion battery

Examples

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Embodiment 1

[0022] A method for preparing a silicate positive electrode material for lithium ion batteries proposed by the present invention is to prepare the silicate positive electrode material by using a one-step sintering process at medium and low temperatures (550-600° C.), specifically comprising the following steps: ①Dissolve 0.09mol of manganous sulfate and 0.01mol of ferrous sulfate in distilled water, and then stir; ②Stir until the manganous sulfate and ferrous sulfate are completely dissolved in distilled water, then add 4mol / L hydrogen dropwise while stirring Sodium oxide solution, until the pH value of the mixture formed by manganous sulfate, ferrous sulfate, sodium hydroxide solution and distilled water is 12, impels manganese ions and iron ions to precipitate completely; ③ adopt existing filtration method to filter out Precipitate, and then wash the precipitate at least once with distilled water or / and ethanol; ④ fully mix the cleaned precipitate with 0.1mol of silicon dioxi...

Embodiment 2

[0029] The process of preparing the silicate positive electrode material in this example is as follows: ① Dissolve 0.1 mol of manganese sulfate in distilled water, and then stir; ② stir until the manganous sulfate is completely dissolved in distilled water, then add 3 mol / L dropwise while stirring Sodium hydroxide solution, until the pH value of the mixed solution mixed by manganous sulfate, sodium hydroxide solution and distilled water is 13, impels manganese ion to precipitate completely; Or / and ethanol cleaning precipitation at least once; 4. fully mix the precipitate after cleaning with 0.1mol of silicon dioxide, 0.08mol of lithium hydroxide, 0.12mol of lithium nitrate; 5. mix the mixed material under inert gas (argon gas or nitrogen) under the protection of one-step sintering, the sintering temperature is 550 ° C, and the sintering time is 12 hours to obtain Li 2 MnSiO 4 powder, Li 2 MnSiO 4 powder as a silicate cathode material.

[0030] In this particular example, x...

Embodiment 3

[0033] The process of preparing the silicate positive electrode material in this example is as follows: ① Dissolve 0.08 mol of manganous sulfate and 0.02 mol of ferrous sulfate in distilled water, and then stir; ② stir until the manganous sulfate and ferrous sulfate are completely dissolved in After the distilled water, add dropwise 5mol / L sodium hydroxide solution while stirring until the pH value of the mixture formed by manganous sulfate, ferrous sulfate, sodium hydroxide solution and distilled water is 11, which promotes the manganese ion and iron The ions are completely precipitated; ③Use the existing filtration method to filter out the precipitate, and then wash the precipitate at least once with distilled water or / and ethanol; ④Combine the cleaned precipitate with 0.1mol of silicon dioxide, 0.08mol of lithium hydroxide, 0.12mol of Lithium nitrate is fully mixed; ⑤ The mixed material is sintered under the protection of an inert gas (argon or nitrogen), the sintering tempe...

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Abstract

The invention discloses a preparation method of a silicate positive electrode material for a lithium ion battery, which comprises the following steps of: dissolving manganous sulfate and ferrous sulfate into distilled water, after the manganous sulfate and the ferrous sulfate are completely dissolved, stirring while dripping 3-5mol / L of sodium hydroxide solution until the pH value is 11-13 so as to ensure that manganese ions and iron ions are completely precipitated; then filtering the precipitates and cleaning the precipitates with the distilled water; mixing the precipitates with silicon dioxide, lithium hydroxide and lithium nitrate; and carrying out one-step sintering on the mixed materials for 8-12h in the presence of inert gas shielding at 550-600DEG C to obtain Li2Mn1-xFexSiO4 powder as the silicate positive electrode material. The invention has the advantages that one-step sintering is only needed, is the method is simpler and more convenient compared with the traditional process with multiple sintering; meanwhile, because a high-temperature sintering process is avoided in the method, the positive electrode materials prepared are uniform with good dispersity, thereby ensuring that the prepared positive electrode material has favorable electrochemical 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 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 present, there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20H01M4/58
CPCY02E60/10
Inventor 崔佳舒杰水淼任元龙黄锋涛徐丹徐锦锦侯璐
Owner NINGBO UNIV
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