Preparation method of silicon oxide nanosheet composite ternary positive electrode material for lithium battery

A ternary lithium battery and cathode material technology, applied in battery electrodes, positive electrodes, nanotechnology and other directions, can solve the problems of poor effect, unstable ternary cathode material structure, complicated modification process, etc., to improve structural stability , The preparation process is simple and controllable, and the structure is stable.

Inactive Publication Date: 2021-02-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
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Problems solved by technology

[0007] In view of the unstable structure of the current lithium battery ternary positive electrode material, and the defects of complex and poor effect in the existing modification process, the present invention proposes a method for preparing a silicon oxide nanosheet composite ternary lithium battery positive electrode material. Therefore, the stability of the positive electrode material of lithium batteries is improved, and the process is simple, which has the potential of industrial production

Method used

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  • Preparation method of silicon oxide nanosheet composite ternary positive electrode material for lithium battery

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Effect test

Embodiment 1

[0035] (1) Add 15kg of silicon-lithium alloy powder into 90kg of absolute ethanol and 45kg of isopropanol, and disperse evenly to obtain a silicon-lithium alloy dispersion;

[0036] (2) The silicon-lithium alloy dispersion was placed in an ice-water bath and stirred slowly, with the speed controlled at 200 rpm, until the reaction was complete until no bubbles were generated, and the nano-silicon wafer dispersion was obtained;

[0037] (3) Add 70kg of nickel acetate, 25kg of cobalt acetate, and 25kg of manganese acetate into 650kg of deionized water and mix evenly to obtain a mixed solution, and then mix evenly with 150kg of nano-silicon chip dispersion to obtain a metal salt / nano-silicon chip mixed solution;

[0038] (4) Slowly stir the metal salt / nano-silicon flakes mixed solution at a speed of 200rpm for 2.5h, then add ammonia water to adjust the pH value to 10, and then let it stand for 2.5h to obtain a coprecipitate-coated silicon nanoflake solution, and then Rotary evapor...

Embodiment 2

[0041] (1) Add 12kg of silicon-lithium alloy powder into 95kg of absolute ethanol and 42kg of isopropanol, and disperse evenly to obtain a silicon-lithium alloy dispersion;

[0042] (2) Place the silicon-lithium alloy dispersion in an ice-water bath and stir slowly, with the speed controlled at 150 rpm, until the reaction is complete until no bubbles are generated, and the nano-silicon wafer dispersion is obtained;

[0043] (3) Add 60kg of nickel acetate, 20kg of cobalt acetate, and 20kg of manganese acetate into 700kg of deionized water and mix evenly to obtain a mixed solution, then mix evenly with 149kg of nano-silicon chip dispersion to obtain a metal salt / nano-silicon chip mixed solution;

[0044] (4) Slowly stir the metal salt / nano-silicon flakes mixed solution at a speed of 200rpm for 3h, then add ammonia water to adjust the pH value to 9.5, and then let it stand for 2h to obtain a co-precipitate-coated silicon nanoflake solution, and then rotary evaporate Solvent to ob...

Embodiment 3

[0047] (1) Add 18kg of silicon-lithium alloy powder into 88kg of absolute ethanol and 48kg of isopropanol, and disperse evenly to obtain a silicon-lithium alloy dispersion;

[0048] (2) Place the silicon-lithium alloy dispersion in an ice-water bath and stir slowly, with the speed controlled at 250 rpm, until the reaction is complete until no bubbles are generated, and the nano-silicon wafer dispersion is obtained;

[0049] (3) Add 90kg of nickel acetate, 30kg of cobalt acetate, and 30kg of manganese acetate into 600kg of deionized water and mix evenly to obtain a mixed solution, and then mix evenly with 154kg of nano-silicon chip dispersion to obtain a metal salt / nano-silicon chip mixed solution;

[0050] (4) Slowly stir the metal salt / nano-silicon flakes mixed solution at a speed of 250rpm for 2h, then add ammonia water to adjust the pH value to 10.5, and then let it stand for 3h to obtain a co-precipitate-coated silicon nanoflake solution, and then rotary evaporate Solvent ...

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Abstract

The invention provides a preparation method of a silicon oxide nanosheet composite ternary positive electrode material for a lithium battery. The preparation method comprises the following steps: adding silicon-lithium alloy (Li13Si4) powder into absolute ethyl alcohol and isopropanol to prepare a silicon-lithium alloy dispersion liquid; then conducting slow stirring and reacting in an ice-water bath to obtain a nano-silicon wafer dispersion liquid; then mixing and stirring the nano-silicon wafer dispersion liquid with nickel acetate, cobalt acetate, manganese acetate and deionized water, thenadjusting a pH value, and carrying out rotary evaporation on the solvent to obtain silicon nanosheet / NCM precursor slurry; and finally, conducting sintering under an oxygen-enriched condition to obtain the positive electrode material for the lithium battery. According to the method provided by the invention, silicon nanosheets are formed by delithiation of the silicon-lithium alloy, then the silicon nanosheets are loaded with NCM to form a uniform layered structure, and the uniform layered structure is oxidized to support positive electrode particles as a framework, so the layered structure can be inhibited from being converted into a spinel structure in circulation and sintering processes, and the structural stability of the positive electrode material is remarkably improved; and the method is simple and controllable in preparation procedures and has industrial production potential.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a method for preparing a silicon oxide nanosheet composite ternary lithium battery cathode material. Background technique [0002] Lithium-ion batteries are the most excellent environmentally friendly mobile energy in recent years. Due to the advantages of high energy, long life, low consumption, no pollution, no memory effect, small self-discharge, low internal resistance, high cost performance, and less pollution, it is widely used in mobile phones, notebook computers, video cameras, digital cameras, electric motors, etc. automotive and other fields. Since its birth, it has brought revolutionary changes to the energy field. The main constituent materials of lithium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion, because the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈庆廖健淞司文彬白涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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