Huawei's lithium-ion battery 'Yangmou' silicon carbon anode obtains new patent

On February 2, Huawei announced a patent entitled 'Silicon-carbon composite material and its preparation method and lithium-ion battery.' According to the patent, the silicon-carbon composite material supplied by this invention has a small internal pore size, which can effectively reduce the contact area between the silicon material and the electrolyte, reduce the occurrence of side reactions, and prolong the battery life; at the same time, the silicon material is evenly dispersed around the graphite skeleton. Without agglomeration, the graphite skeleton can effectively alleviate the volume expansion and contraction of the silicon material, and improve the structural stability and energy density of the composite material. As shown in the figure below, the silicon-carbon composite material includes a core (10) and a carbon layer (20) covering the surface of the core. The core is composed of a graphite skeleton (101), amorphous carbon (102) filled in the gaps of the graphite skeleton, and uniform It is composed of silicon material (103) distributed in amorphous carbon. The battery using the silicon-carbon composite material supplied by the patent has a 500-cycle capacity retention rate of 80% in the cycle performance of the battery cell, while the battery using the silicon-carbon composite material of the comparative example has a capacity of 80% after 200 cycles. . In fact, Huawei's research on silicon carbon anode materials was involved as early as 2012, and it has two other patents. It is worth noting that since January, in terms of improving energy density and cycle life, vehicle and battery companies have started with silicon anode materials and pre-lithiation. Including Guoxuan Hi-Tech 210Wh/kg LFP battery using 'high-gram capacity silicon anode material and pre-lithiation technologyLithium supplement technology' and so on. Not long ago, Huawei also announced two patents related to lithium-ion batteries, involving conductive binders for lithium-ion batteries, using graphene materials. And GAC Ion recently announced that batteries using graphene-based technology will soon be mass-produced. In fact, Huawei's research in the field of lithium batteries goes far beyond anode materials, and has accumulated long-term research and development. Gaogong Lithium Battery found through the State Intellectual Property Office that, so far, Huawei has more than 100 patents on lithium-ion batteries, including positive electrodes, negative electrodes, electrolytes, separators, solid electrolytes, battery modules, and battery thermal runaway. Involved. In addition to Huawei's independent research and development, a few patents are also jointly developed with lithium battery companies such as Xiamen Tungsten New Energy, Shanshan, Zhenhua New Materials, and Lifang New Energy. In terms of battery applications, in September 2020, Huawei launched the three-electric cloud service, which aims to combine its core technologies in the battery and ICT fields to solve the battery safety and life management issues of new energy vehicles. In terms of the layout of electric vehicles, recent news said that the 'Huawei version' model jointly developed by Huawei and BAIC New Energy will be announced in April this year and will be launched in November. The high-end smart model jointly created by Changan Automobile, Huawei and CATL Car brands have also recently reported that they have registered trademarks.