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Composite positive electrode material and preparation method thereof

A composite positive electrode material and positive electrode technology, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems that affect the electrochemical performance and safety performance of positive electrode materials, low initial charge and discharge efficiency of batteries, strong oxidation of electrolyte, etc. problems, to achieve the effect of improving the overall electrochemical performance, improving the first charge and discharge efficiency, and improving cycle stability

Inactive Publication Date: 2017-09-22
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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AI Technical Summary

Problems solved by technology

[0003] However, such layered transition metal oxide cathode materials will exist lithium ions in the form of Li 2 The form of O comes out and cannot be re-inserted into the positive electrode, resulting in a large irreversible reaction, resulting in low initial charge and discharge efficiency of the lithium-ion battery, and under high voltage, it is highly oxidizing to the electrolyte and easily reacts to generate hydrofluoric acid. , destroying the SEI film on the surface of the positive electrode material, affecting the electrochemical performance and safety performance of the positive electrode material

Method used

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  • Composite positive electrode material and preparation method thereof
  • Composite positive electrode material and preparation method thereof
  • Composite positive electrode material and preparation method thereof

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preparation example Construction

[0022] The invention provides a method for preparing a composite positive electrode material, comprising the following steps:

[0023] Step 1: dissolving a certain amount of aluminum salt in a solvent to obtain an aluminum salt solution, adding a certain amount of positive electrode matrix material to the aluminum salt solution, and uniformly dispersing to obtain a primary mixed solution;

[0024] Step 2: dissolving a certain amount of fluoride salt and phosphate in a solvent to prepare a mixed solution of fluoride salt and phosphate;

[0025] Step 3: In the case of continuous stirring, add the mixed solution of fluoride salt and phosphate salt prepared in Step 2 dropwise to the primary mixed solution prepared in Step 1, let stand after a period of reaction, wash, filter and dry , sintered in an inert atmosphere, that is, a composite positive electrode material coated with a composite coating layer is obtained; the composite coating layer includes AlF 3 and AlPO 4 , the mass...

Embodiment 1

[0030] Weigh 1.39g of Al(NO 3 ) 3 9H 2 O was dissolved in 100mL deionized water to prepare an aluminum nitrate solution, and 10.0g of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into the aluminum nitrate solution, stir and disperse to obtain a primary mixed solution; weigh 0.31g of NH 4 F and 0.12g of (NH 4 ) 2 HPO 4 Dissolve in 20mL deionized water to prepare a mixed solution of fluoride salt and phosphate; under the condition of continuous stirring, add the prepared fluoride salt solution and phosphate solution dropwise into the primary mixed solution, react for 2 hours and then let it stand , after cleaning, filtering and drying, sintering at 400°C for 5h in an inert atmosphere, to obtain AlF-coated 3 / AlPO 4 A composite positive electrode material with a composite cladding layer.

Embodiment 2

[0032] Weigh 1.01g of Al 2 (SO 4 ) 3 Dissolve in 100mL deionized water to prepare aluminum sulfate solution, weigh 10.0g of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into the aluminum sulfate solution, stir and disperse to obtain a primary mixed solution; weigh 0.20g of NH 4 F and 0.16g of (NH 4 ) 2 HPO 4 Dissolve in 20mL deionized water to prepare a mixed solution of fluoride salt and phosphate; under the condition of continuous stirring, add the prepared fluoride salt solution and phosphate solution dropwise into the primary mixed solution, react for 3 hours and then let it stand , after cleaning, filtering and drying, sintering at 500°C for 4h in an inert atmosphere to obtain AlF-coated 3 / AlPO 4 A composite positive electrode material with a composite cladding layer.

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Abstract

The invention provides a composite positive electrode material and a preparation method thereof. A lithium ion battery positive electrode substrate material is combined and coated by two substances of AlF3 and AlPO4, the AlF3 is used as a protection layer to prevent corrosion of hydrofluoric acid on the positive electrode substrate material, the cycle stability is improved, the AlPO4 is similarly used as a protection layer for coating, the initial charge-discharge efficiency is improved, the cycle property is improved, the integral electrochemical performance of a lithium ion battery is improved, and moreover, the preparation method of the composite positive electrode material is simple and is easy to implement.

Description

【Technical field】 [0001] The invention relates to the technical field of battery materials, in particular to a composite positive electrode material and a preparation method thereof. 【Background technique】 [0002] Commonly used cathode materials for lithium-ion batteries include lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganese oxide, and lithium cobalt oxide. Among them, the layered transition metal oxide cathode material Li 1+x m 1-x o 2 (M is one or more of Ni, Co, Mn, Al, 0≤x≤1 / 3) has received extensive attention and research from the industry and scholars, such as LiCoO 2 , LiMn 2 o 4 、LiNi x mn 1-x o 2 、LiNi x co y mn 1-x-y o 2 and LiNi 0.85 co 0.15 Al 0.05 o 2 , this type of layered transition metal oxide cathode material is used as a high-voltage material, which can exert a high mass specific capacity (>170mAh / g), and is an important part of the development of lithium-ion cathode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 容亮斌刘春亮刘熙林邓昌源许辉饶睦敏
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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