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Lithium-rich manganese-based cathode material with crosslinking structure and preparation method thereof

A cathode material, lithium-rich manganese-based technology, applied in structural parts, chemical instruments and methods, nanotechnology for materials and surface science, etc. Violent problems, etc., to achieve the effect of low resistance to release and embedding, reasonable pore size distribution, and high specific capacity

Inactive Publication Date: 2018-09-07
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional water-based solvents have high polarity. In the process of microwave radiation, the molecules collide violently with each other, and the heating rate is too fast, which is not conducive to the fine crystal growth of materials.

Method used

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  • Lithium-rich manganese-based cathode material with crosslinking structure and preparation method thereof
  • Lithium-rich manganese-based cathode material with crosslinking structure and preparation method thereof
  • Lithium-rich manganese-based cathode material with crosslinking structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix ethanol and deionized water at a volume ratio of 9.0:1.0, add 0.0015 mol of nickel nitrate, 0.0015 mol of cobalt nitrate and 0.005 mol of manganese acetate, and ultrasonically stir to dissolve them completely. Transfer the above mixed solution to a microwave reactor, adjust the microwave power to 350W, heat the mixed solution to a reflux state, maintain the reflux state, control the temperature at 72°C, slowly add 0.3mol ammonia water to it, and keep the reaction for 10 minutes after the dropwise addition , cooled at room temperature, centrifuged, collected the precipitate, washed, and dried in vacuum to prepare the nickel cobalt manganese hydroxide precursor. Subsequently, the precursor and lithium carbonate were thoroughly mixed and ground at a molar ratio of 1:1.23, calcined in a tube furnace at 888°C for 10 h, cooled and then ground to obtain the final lithium-rich manganese-based cathode material.

[0032] SEM test: figure 1 SEM images of the as-prepared lithi...

Embodiment 2

[0040] Mix methanol and deionized water at a volume ratio of 9.5:0.5, add 0.002mol of nickel sulfate, 0.002mol of cobalt acetate and 0.004mol of manganese acetate, and ultrasonically stir to dissolve it completely. Transfer the above mixed solution to a medium microwave reactor, adjust the microwave power to 250W, heat the mixed solution to the reflux state, maintain the reflux state, maintain the temperature at 68°C, slowly add 0.4mol ammonia water to it, and keep the reaction for 12 minutes after the end. Cool at room temperature, centrifuge, collect the precipitate, wash, and vacuum-dry to prepare the nickel-cobalt-manganese hydroxide precursor. Subsequently, the precursor and lithium carbonate were thoroughly mixed and ground at a molar ratio of 1:1.22, calcined in a tube furnace at 900°C for 10 h, cooled and then ground to obtain the final lithium-rich manganese-based cathode material.

Embodiment 3

[0042]Mix absolute ethanol, methanol and deionized water at a volume ratio of 6:3:1, add 0.0012mol of nickel nitrate, 0.0012mol of cobalt nitrate and 0.006mol of manganese acetate, and ultrasonically stir to dissolve them completely. Transfer the above mixed solution to a medium microwave reactor, adjust the microwave power to 300W, heat the mixed solution to the reflux state, maintain the reflux state, and maintain the temperature at 70°C, slowly add 0.3mol ammonia water and ammonium bicarbonate aqueous solution to it, and end Afterwards, keep the reaction for 8 minutes, cool at room temperature, and centrifuge to collect the precipitate, wash it, and dry it in vacuum to prepare the nickel-cobalt-manganese hydroxide precursor. Subsequently, the precursor and lithium carbonate were thoroughly mixed and ground at a molar ratio of 1:1.18, calcined in a tube furnace at 950 °C for 8 hours, cooled and then ground to obtain the final lithium-rich manganese-based cathode material.

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Abstract

The invention relates to a lithium-rich manganese-based cathode material with a crosslinking structure and a preparation method thereof. The preparation method specifically comprises the following steps of (1) preparing a mixed reaction solvent of deionized water and organic alcohol; (2) mixing and dissolving soluble nickel, cobalt and manganese salts into the mixed reaction solvent; (3) heating the mixed reaction solvent to the reflux state by a microwave radiation manner; (4) under the continuous reflux state, adding an alkaline resource, and maintaining reaction, so as to obtain a nickel, cobalt and manganese hydroxide precursor; (5) fully mixing the nickel, cobalt and manganese hydroxide precursor and a lithium source, and calcining, so as to obtain the final lithium-rich manganese-based cathode material. The prepared lithium-rich manganese-based cathode material has the advantages that a crosslinking net-shaped structure is formed, the pore radius is rich, the crystallizing degreeis high, and the lithium ions are quickly disembedded and embedded at low resistance; the method for preparing the precursor of the lithium-rich manganese-based material is simple, the time is short,the organic solvent can be repeatedly recycled and used, the cost is reduced, the environment-friendly effect is realized, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich manganese-based positive electrode material with a crosslinked structure and a preparation method thereof Background technique [0002] With the continuous improvement of the quality of life, the specific capacity of the existing lithium-ion cathode materials can no longer meet people's further demand for battery life, so it is very urgent to develop high-capacity lithium-ion battery cathode materials. Lithium-rich manganese-based materials, a new cathode material for lithium-ion batteries, have been proven to have a high specific capacity, the latest report is about 350mAh / g. The lithium-ion battery assembled with such a high specific capacity of the positive electrode and the silicon / carbon negative electrode can potentially meet the requirements of the Ministry of Industry and Information Technology for the energy density of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G53/006C01P2004/03C01P2004/20C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 严涛翟传鑫徐子福张明慧
Owner 安普瑞斯(无锡)有限公司
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