On February 2, Huawei announced a lithium battery technology patent, namely the patent for "silicon-carbon composite material and its preparation method and lithium-ion battery". It mainly provides a silicon-carbon composite material, including a core and a carbon layer covering the surface of the core, which can extend the battery life.
The abstract shows that the present invention provides a silicon-carbon composite material, including a core and a carbon layer covering the surface of the core. 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 material has only a pore structure with a pore size of less than or equal to 50 nm, and no pore structure with a pore size greater than 50 nm.
The silicon-carbon composite material has small internal pore size, which can effectively reduce the contact area between silicon material and electrolyte, reduce the occurrence of side reactions, and extend battery life. At the same time, the silicon material is uniformly dispersed around the graphite skeleton without agglomeration, which allows the graphite skeleton to effectively alleviate the volume expansion and contraction of silicon material, thereby improving the structural stability and energy density of the composite material.
The present invention also provides a method for preparing the silicon-carbon composite material and a lithium-ion battery containing the silicon-carbon composite material.
This is the second major patent related to new energy vehicles that Huawei has recently disclosed.
In late January, Huawei published an automotive patent application, with application number "CN112248801A" and patent title "Reducer, Powertrain and Vehicle".
