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Composite material for lithium ion battery, preparation method thereof, and lithium ion battery containing the composite material

A technology for lithium ion batteries and composite materials, which is applied in the field of composite materials for lithium ion batteries and their preparation, can solve the problems of easy expansion and detachment of negative electrodes, achieve improved transmission performance and stability, good application potential, and improved lithium ion the effect of transmission

Active Publication Date: 2021-05-18
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 for lithium ion battery, preparation method thereof, and lithium ion battery containing the composite material
  • Composite material for lithium ion battery, preparation method thereof, and lithium ion battery containing the composite material
  • Composite material for lithium ion battery, preparation method thereof, and lithium ion battery containing the composite material

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specific Embodiment approach 1

[0031] A composite material for a lithium ion battery, the composite material includes a sulfide electrolyte 41 and a nano attapulgite 42 , and the sulfide electrolyte 41 coats the nano attapulgite 42 .

[0032] Further, the thickness of the sulfide electrolyte 41 is less than or equal to 20um, and the lithium ion conductivity of the sulfide electrolyte 41 is in the order of magnitude of 10. -5 S / cm to 10 -2 S / cm; the nano attapulgite 42 is commercialized nano attapulgite, and the rod crystal of the nano attapulgite 42 is 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 a halogen element, 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 5...

Embodiment 1

[0049] A preparation method of a composite material for a lithium ion battery, comprising the following steps:

[0050] Step 1: Weigh 40 parts of Li in an argon atmosphere 2 S was dissolved in absolute ethanol, 1.50 parts of nano attapulgite was added to fully soak the bubbles, vacuumed at room temperature, and then heated to 50 ° C, and the solvent was removed by dehydrated ethanol to obtain the nano attapulgite composite coated with lithium sulfide. Material;

[0051] Step 2: In argon atmosphere, the nano attapulgite composite material after the lithium sulfide coating 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 in 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, the mixed powder of system A is added into a quartz tube, and heated after vacuum sealing. The heating temperature is 400° C. and the heat...

Embodiment 2

[0056] A preparation method of a composite material for a lithium ion battery, comprising the following steps:

[0057] Step 1: Weigh 100 parts of Li in an argon atmosphere in mole fractions 2 S is dissolved in absolute ethanol, 80.00 parts of nano attapulgite are added to fully soak the bubbles, then heated to 90°C in an argon atmosphere, and the solvent ethanol is removed to obtain a lithium sulfide-coated nano attapulgite composite material;

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

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Abstract

The invention provides a composite material for a lithium ion battery, a preparation method thereof, and a lithium ion battery containing the composite material. The composite material includes a sulfide electrolyte and a nano-attapulgite, and the sulfide electrolyte is coated with a nano-attapulgite. . The invention also provides a preparation method of the composite material and a lithium-ion battery containing the composite material. The invention belongs to the technical field of lithium-ion batteries. Attapulgite coated with a sulfide electrolyte has a rod-like structure at the nanometer level and can form a continuous battery. The lithium-conducting structure of the sulfide electrolyte makes the negative electrode have good lithium ion transport performance, and the lithium ion battery containing the composite material has a good 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 for a lithium ion battery, 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 supply, 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, and are the development trend of lithium-ion batteries. [0003] The current mainstream route ...

Claims

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Application Information

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Patent Type & Authority Patents(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高云智
Owner ZHUHAI COSMX BATTERY CO LTD
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