Lithium battery negative electrode material containing pre-lithiated silylene material, preparation method and lithium battery

A technology of pre-lithiated silicene and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low first-time cycle efficiency and volume expansion problems

Active Publication Date: 2020-08-18
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical capacity of silicon negative electrode is 4200mAh / g, which is much higher than that of graphite, but its volume expansion in the process of deintercalating lithium has always been a problem
However, similar to traditional nano-silicon-carbon composites, the presence of silicene will lead to low first cycle efficiency

Method used

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  • Lithium battery negative electrode material containing pre-lithiated silylene material, preparation method and lithium battery
  • Lithium battery negative electrode material containing pre-lithiated silylene material, preparation method and lithium battery
  • Lithium battery negative electrode material containing pre-lithiated silylene material, preparation method and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The silicon oxide sample and lithium carbonate powder were mixed according to the mass ratio of 6:1, and sintered in the argon protective atmosphere in the rotary furnace. The furnace tube speed was 10r / min, and the heating rate was 2°C / min. After 2 hours, the pre-lithiated siloxane material was obtained; the pre-lithiated siloxane material and natural graphite were added to a planetary ball mill in a mass ratio of 1:1, and ball milled and mixed at a speed of 250r / min for 1h. Obtain a silicon-carbon composite material; mix the above-mentioned silicon-carbon composite material with pitch at a mass ratio of 9:1, enter a rotary furnace under the protection of an argon atmosphere for pyrolysis coating of an organic carbon source, the furnace tube speed is 10r / min, and the heating rate is 2 °C / min, holding time at 900 °C for 2 hours, naturally cooling to room temperature, and sieving to obtain the negative electrode material containing pre-lithiated siloxane.

[0059] In the...

Embodiment 2

[0066] Mix the silicene sample and lithium carbonate powder at a mass ratio of 5:1, sinter in a rotary furnace under an argon protective atmosphere, the furnace tube speed is 10r / min, the heating rate is 2°C / min, the temperature is raised to 800°C, and the holding time is 30min , to obtain a pre-lithiated silicene material; the pre-lithiated silicene material and artificial graphite are added to a planetary ball mill in a mass ratio of 1:2 for ball milling and mixing at a speed of 150r / min for 2 hours to obtain a silicon-carbon composite Materials: the above-mentioned silicon-carbon composite material is heated to 800°C under the protection of argon atmosphere, and acetylene is passed through 800°C for carbon source gas gas phase coating, the furnace tube speed is 10r / min, the heating rate is 2°C / min, and the holding time is 800°C After 2 hours, it was naturally cooled to room temperature, and sieved to obtain a negative electrode material containing pre-lithiated silicene.

...

Embodiment 3

[0069] Mix silene oxide and lithium hydroxide powder at a mass ratio of 5.2:1, and sinter in a rotary furnace under an argon protective atmosphere. After 12 hours, the pre-lithiated siloxane material was obtained; the pre-lithiated siloxane material and the mesophase carbon microspheres were added to a planetary ball mill in a mass ratio of 1:1.2 for ball milling and mixing at a speed of 500r / min. The time is 30 minutes to obtain the silicon-carbon composite material; the above-mentioned silicon-carbon composite material is heated to 600°C under the protection of argon atmosphere, and acetylene is passed through acetylene at 600°C for carbon source gas vapor phase coating, the furnace tube speed is 10r / min, and the heating rate is 2°C / min, holding time at 600°C for 12 hours, naturally cooling to room temperature, and sieving to obtain the negative electrode material containing pre-lithiated siloxane.

[0070] The above-mentioned negative electrode material containing pre-lith...

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Abstract

The embodiment of the invention relates to a lithium battery negative electrode material containing a pre-lithiated silylene material, a preparation method and a lithium battery. The negative electrode material has a core-shell structure, wherein an inner core is a mixture of the pre-lithiated silylene material and carbon particles, and an outer shell is one or more carbon-containing layers; the mass ratio of the inner core to the negative electrode material is [80%, 99%]; the mass ratio of the pre-lithiated silylene material in the inner core to the inner core is [10%, 90%]; the mass ratio ofthe outer shell to the negative electrode material [1%, 20%]; the pre-lithiated silylene material is of a sheet structure, and a phase comprises nano silicon and / or silicon oxide and lithium silicate; and the lithium silicate is one or more of Li4SiO4, Li2SiO5 and Li2SiO3. The negative electrode material effectively alleviates the expansion problem of the negative electrode material through the flaky characteristics of silylene or silylene oxide; by lithiating the silylene material in advance, the first charge-discharge efficiency of the negative electrode material is improved; and through carbon coating on the surface layer, the negative electrode material has the advantages of long cycle and high cycle stability.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a lithium battery negative electrode material containing a pre-lithiated silicene material, a preparation method and a lithium battery. Background technique [0002] Since the 21st century, global climate warming has led to the melting of polar glaciers, rising sea levels, and damage to the balance of global natural ecosystems. The main reason for this is the massive emission of greenhouse gases. The energy industry is one of the most important sources of greenhouse gas emissions, and the development of green and clean energy is the current top priority. [0003] Lithium-ion battery is a secondary battery with small size, high energy density, green and environmental protection in the process of manufacturing and use, and is widely accepted in the industry. [0004] At present, the lithium-ion battery anode materials commonly used in the market are mainly graphite anode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525
CPCH01M4/485H01M4/364H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 朱静刘柏男罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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