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Composite material, preparation method thereof and lithium ion battery comprising composite material

A lithium-ion battery and composite material technology, which is applied in the field of composite materials and its preparation, can solve the problems of easy expansion and falling off of the negative electrode

Active Publication Date: 2019-06-21
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent application with the application number CN201810329907.0 discloses a negative electrode composite material for an all-solid lithium-ion secondary battery, a negative electrode containing it, and an all-solid lithium-ion secondary battery with the negative electrode. The material contains a negative electrode active material, a solid electrolyte and a conductive material, the negative electrode active material includes at least one selected from a metal that can form an alloy with Li and an oxide of the metal, the solid electrolyte is a sulfide solid electrolyte, and the conductive material is a conductive carbon material, but the negative electrode active material also contains silicon, and there will be a problem that the negative electrode is easy to expand and fall off during the charging and discharging process of the lithium-ion battery.

Method used

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  • Composite material, preparation method thereof and lithium ion battery comprising composite material
  • Composite material, preparation method thereof and lithium ion battery comprising composite material
  • Composite material, preparation method thereof and lithium ion battery comprising composite material

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specific Embodiment approach 1

[0031] A composite material, the composite material includes a sulfide electrolyte 41 and a nano-attapulgite 42, and the sulfide electrolyte 41 covers the nano-attapulgite 42.

[0032] Further, the thickness of the sulfide electrolyte 41 is ≤20um, and the lithium ion conductivity of the sulfide electrolyte 41 is on the order of 10 -5 S / cm to 10 -2 S / cm; the nano-attapulgite 42 is a commercial nano-attapulgite, and the rod crystals of the nano-attapulgite 42 are 100nm-50um in length and 10nm-120nm in width.

[0033] Further, the sulfide electrolyte 41 is a combination of one or more of the following substances: aLi 2 S·bP 2 S 5 cLiX, where X represents halogen elements, 20≤a≤80, 20≤b≤40, 0≤c≤20; aLi 2 S·bP 2 S 5 cMeS, where Me is Si, Ge, Sn, Al or B, 20≤a≤80, 20≤b≤40, 0≤c≤20; aLi 2 S·bP 2 S 5 · cP 2 o 5 , where 674-a Si 1-a P a S 4 , where 02 S·(30−a)P 2 S 5 ·aP 2 S 3 , where 02 S·bSiS 2 , where 50≤a≤70, 30≤b≤50; Li 4-a Si 1-a al a S 4 , where 02 S·bSiS ...

Embodiment 1

[0049] A method for preparing a composite material, comprising the steps of:

[0050] Step 1: In terms of molar parts, weigh 40 parts of Li in an argon environment 2 Dissolve S in absolute ethanol, add 1.50 parts of nano-attapulgite to soak fully, then vacuumize at room temperature, then heat to 50°C, remove solvent anhydrous ethanol, and obtain nano-attapulgite composite coated with lithium sulfide Material;

[0051] Step 2: In terms of molar fractions, under an argon atmosphere, the nano-attapulgite composite material coated with lithium sulfide obtained in step 1, 13.5 parts of P 2 S 5 , put them together with zirconia balls into a bowl made of zirconia, seal the bowl under an argon atmosphere, install the bowl on a ball mill, rotate at a speed of 200r / min, and mix for 20 hours to obtain a fully mixed In system A, add the mixed powder of system A into a quartz tube, heat it after vacuum sealing, the heating temperature is 400°C, and the heating time is 2 h to obtain a co...

Embodiment 2

[0056] A method for preparing a composite material, comprising the steps of:

[0057] Step 1: In terms of molar parts, weigh 100 parts of Li in an argon atmosphere 2 Dissolve S in absolute ethanol, add 80.00 parts of nano-attapulgite to soak fully, heat to 90°C under argon atmosphere, remove solvent ethanol, and obtain nano-attapulgite composite material coated with lithium sulfide;

[0058] Step 2: In terms of molar fractions, under an argon atmosphere, the nano-attapulgite composite material coated with lithium sulfide obtained in step 1, 30 parts of P 2 S 5 , 3 parts of LiBr, put them into a bowl made of zirconia together with zirconia balls, seal the bowl under an argon atmosphere, install the bowl on a ball mill, rotate at a speed of 300r / min, and mix for 30h to obtain sufficient After mixing the A system, add the mixed powder of the A system into a quartz tube, heat it after vacuum sealing, the heating temperature is 300 °C, and the heating time is 6 h to obtain a comp...

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Abstract

The invention provides a composite material, a preparation method thereof and a lithium ion battery comprising the composite material. The composite material comprises a sulfide electrolyte and nanometer atapulgite, wherein the sulfide electrolyte warps the nanometer atapulgite. The invention also provides the preparation method of the composite material and the lithium ion battery comprising thecomposite amterial, and belongs to the technical field of lithium ion batteries. The atapulgite coated with the sulfide electrolyte has a rodlike structure at a nanometer layer, a continuous sulfide electrolyte lithium conduction structure can be formed, so that a negative electrode has favorable lithium ion transmission performance, and the lithium ion battery comprising the composite material has favorable application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite material, a preparation method thereof and a lithium ion battery containing the composite material. Background technique [0002] With the wide application of lithium-ion batteries in power sources, digital products and other fields, consumers have higher and higher requirements for the safety performance and energy density of lithium-ion batteries. Liquid lithium-ion batteries may have safety problems such as electrolyte leakage, fire, and explosion during use. At the same time, the energy density of existing liquid lithium-ion batteries is getting closer and closer to the theoretical limit, and the technical bottleneck is becoming increasingly prominent. Solid-state batteries have better safety and higher energy density, which is the development trend of lithium-ion batteries. [0003] The current mainstream route of solid-state electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCY02E60/10
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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