Huawei disclosed on February 5 a patent for the invention of "silicon-carbon composite material, its preparation method and lithium-ion battery," which it says can extend the service life of the battery.
The patent, filed on July 31, 2019, relates to a silicon-carbon composite material, including a core and a carbon layer encapsulated on the surface of the core.
Among them, the core includes a graphite skeleton, amorphous carbon-filled in the graphite skeleton structure, and silicon material uniformly distributed in the amorphous carbon.
The silicon-carbon composite has only a pore structure with a pore size less than or equal to 50 nm inside, and there is no pore structure with a pore size greater than 50 nm.
The small pore size inside the silicon-carbon composite can effectively reduce the contact area between the silicon material and the electrolyte, reduce the occurrence of side reactions, and prolong the service life of the battery.
The silicon material is uniformly dispersed around the graphite skeleton without agglomeration, which enables the graphite skeleton to effectively mitigate the volume expansion and contraction of the silicon material and improve the structural stability and energy density of the composite material.
Embodiments of the invention also provide the preparation method of the silicon-carbon composite material and the lithium-ion battery comprising the silicon-carbon composite material.
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