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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: 2011-11-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Embodiment 1

[0023] The present invention proposes a method for preparing a silicate cathode material for lithium ion batteries, which uses a one-step sintering process to prepare a silicate cathode material at medium and low temperatures (550-600°C), which specifically includes the following steps: ① Dissolve 0.09 mol of manganous sulfate and 0.01 mol of ferrous sulfate in distilled water, and then stir; ② After stirring until manganous sulfate and ferrous sulfate are completely dissolved in distilled water, add 4 mol / L hydrogen while stirring Sodium oxide solution, until the pH value of the mixture of manganous sulfate, ferrous sulfate, sodium hydroxide solution and distilled water is 12, which promotes the complete precipitation of manganese ions and iron ions; ③Use existing filtration methods to filter out Precipitate, and then wash the precipitate with distilled water or / and ethanol at least once; ④ Mix the cleaned precipitate with 0.1 mol of silica, 0.08 mol of lithium hydroxide, and 0...

Embodiment 2

[0030] The process of preparing the silicate cathode material in this embodiment is as follows: ① Dissolve 0.1 mol of manganous sulfate in distilled water, and then stir; ② After stirring until the manganous sulfate is completely dissolved in distilled water, add 3 mol / L dropwise while stirring Until the pH of the mixed solution of manganous sulfate, sodium hydroxide solution and distilled water is 13 to promote the complete precipitation of manganese ions; ③Use the existing filtration method to filter out the precipitate, and then use distilled water Or / and ethanol to clean the precipitate at least once; ④ Mix the cleaned precipitate with 0.1 mol of silica, 0.08 mol of lithium hydroxide, and 0.12 mol of lithium nitrate; ⑤ Put the mixed material in an inert gas (argon gas) (Or nitrogen) for one step sintering under the protection of 550℃, and the sintering time is 12 hours to obtain Li 2 MnSiO 4 Powder, will Li 2 MnSiO 4 The powder is used as a silicate cathode material.

[0031]...

Embodiment 3

[0034] The process of preparing the silicate cathode material in this embodiment 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 distilling the water, add 5mol / L sodium hydroxide solution dropwise while stirring until the pH of the mixed solution of manganese sulfate, ferrous sulfate, sodium hydroxide solution and distilled water is 11, which promotes manganese ions and iron The ions are completely precipitated; ③Use the existing filtration method to filter the precipitate, and then wash the precipitate with distilled water or / and ethanol at least once; ④The cleaned precipitate is mixed with 0.1 mol of silica, 0.08 mol of lithium hydroxide, and 0.12 mol Lithium nitrate is fully mixed; ⑤The mixed materials are sintered under the protection of inert gas (argon or nitrogen) at a sintering temperature of 600℃ and a sinter...

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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 Patents(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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