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Boehmite covered graphite composite negative electrode material as well as preparation method and application thereof

A negative electrode material, boehmite technology, applied in the field of boehmite-coated graphite composite negative electrode materials, can solve the problems of low contact resistance, poor thermal stability, fire or explosion of the negative electrode sheet, and achieve low rebound rate of the electrode sheet, Improved thermal stability, high vibration and compacted density effects

Active Publication Date: 2018-05-29
贝特瑞(四川)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the poor thermal stability of graphite-based negative electrode materials in the prior art, the contact resistance of negative electrode sheets in lithium-ion batteries is small, and lithium-ion batteries using graphite-based negative electrode materials are prone to fire or explosion when short-circuited or hard objects are punctured. Safety issues, the purpose of the present invention is to provide a boehmite-coated graphite composite negative electrode material, its preparation method and its use in lithium-ion batteries

Method used

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  • Boehmite covered graphite composite negative electrode material as well as preparation method and application thereof
  • Boehmite covered graphite composite negative electrode material as well as preparation method and application thereof
  • Boehmite covered graphite composite negative electrode material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0076](1) Take graphite and boehmite solution respectively according to the mass ratio of boehmite solute in graphite and boehmite solution 98:2 (in the boehmite solution, the mass percentage of boehmite solute is 5% ), get the above-mentioned quantitative boehmite solution and add it to a certain proportion of deionized water, mix evenly and then add graphite according to the mass ratio to form a suspension, the solid content of the suspension is 30%.

[0077] (2) After that, centrifugal spray drying is carried out under the condition that the outlet temperature is 110°C. The dried sample is directly sieved to obtain the boehmite-coated graphite composite negative electrode material.

Embodiment 2

[0079] (1) According to the mass ratio of boehmite solute and CMC in graphite and boehmite solution to 98:2:(0.1-2), weigh graphite and boehmite solution respectively (in boehmite solution, boehmite solute The mass percent content is 15%) and CMC, take the above-mentioned quantitative CMC powder and add it to a certain proportion of deionized water and stir, and then add the boehmite solution according to the mass ratio after completely dissolving and continue stirring for a period of time. After stirring evenly, press The mass ratio is made by adding graphite to form a suspension, and the solid content of the suspension is 40%.

[0080] (2) After that, centrifugal spray drying is carried out under the condition that the outlet temperature is 110°C.

[0081] (3) Put the dried sample into a tunnel kiln at 900°C for high-temperature treatment, take out the processed sample, and pass through a 250-mesh screen to obtain a boehmite-coated graphite composite negative electrode mater...

Embodiment 3

[0083] (1) Take graphite and boehmite solution respectively according to the mass ratio of boehmite solute and CMC in graphite and boehmite solution (in boehmite solution, The mass percent composition of boehmite solute is 25%) and CMC, get the above-mentioned quantitative CMC powder and join in a certain proportion of deionized water and stir, after dissolving completely, add boehmite solution by mass ratio and continue to stir for a period of time, After uniform stirring, graphite is added according to the mass ratio to form a suspension, and the solid content of the suspension is 45%.

[0084] (2) Spray drying is carried out under the condition that the outlet temperature is 110° C. in the two-fluid spray drying tower. The dried sample was directly sieved to obtain boehmite-coated graphite A.

[0085] (3) Repeat the above steps (1) and (2) to obtain boehmite-coated graphite B with a coating amount of 2%.

[0086] (4) Put the boehmite-coated graphite B into a box-type carb...

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Abstract

The invention relates to a boehmite covered graphite composite negative electrode material as well as a preparation method and application thereof to a lithium-ion battery. The composite negative electrode material comprises a graphite substrate which is used as an inner core, and a cladding layer which is formed by uniformly and continuously cladding boehmite type aluminum oxide on the surface ofthe inner core. The method comprises the following steps: 1) mixing the graphite substrate, a boehmite solution and water; 2) carrying out spray drying on an obtained mixture to obtain the boehmite covered graphite composite negative electrode material. The method provided by the invention has the advantages of low price of raw materials, simple and environment-friendly process and easiness for industrialization; the prepared covered graphite negative electrode material has stable performance; compared with an uncovered graphite substrate, the obtained composite material has the advantages ofhigh jolt ramming, high compaction, high wetting property, high pole piece peeling strength and low pole piece rebound performance. A boehmite covering layer is introduced, so that thermal reaction between electrolyte and graphite can be effectively inhibited and a thermal runaway risk caused by extreme conditions including battery short circuit and the like is prevented.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, and relates to a composite negative electrode material, its preparation method and application, in particular to a boehmite-coated graphite composite negative electrode material, its preparation method and its application in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in digital 3C, pure electric / hybrid vehicles and energy storage since their commercialization in 1990. At present, in commercial lithium-ion batteries, the positive electrode materials are divided into ternary, lithium cobalt oxide and lithium iron phosphate systems, while the negative electrode materials are still mainly graphite. Graphite anode material has the characteristics of low cost, easy processing, low lithium intercalation potential, and no pollution, so it is widely used as anode material for lithium-ion batteries. [0003] Wit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/62H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 黄家骏李子坤闫慧青赵勃黄友元岳敏
Owner 贝特瑞(四川)新材料科技有限公司
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