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China, the United States, Japan and South Korea solid battery market is fierce

The solid-state lithium battery, that is, the electrolyte, is a secondary battery of a solid material, and the core material mainly includes a positive electrode, a negative electrode, a solid electrolyte, a current collector, a pole, and the like. Solid-state batteries can be classified into two types according to the form of the electrolyte. One is an all-solid battery, that is, a solid electrolyte is used completely without using any liquid, and all materials are present in a solid form; the other is a solid-liquid mixed electrolyte battery. The battery contains both a solid electrolyte and a plasticizer.

Global industry status

On January 30, 2019, Fuji Economics Co., Ltd. released the "Secondary Lithium Ion Battery Global Market Survey" report. In the next few years, the market share of lithium batteries will continue to rise, and mainly used in the field of pure electric vehicles. Solid-state batteries as the next-generation battery technology, the future market prospects will be very clear. Therefore, in the stage where solid-state batteries have not yet entered mass production, Japan, South Korea, the United States and other countries and world-renowned companies have been deployed to develop solid-state battery technology.

At present, in the process of industrialization, there has been a situation of multi-party competition. Japanese companies led by Toyota have taken the lead in the world relying on the strong support of domestic policies and their own strong R&D capabilities. Japan’s main line of research and development for all-solid-state batteries has gradually shifted from the initial exploration of high-performance electrolyte materials to solving problems such as The production of battery cells, the development of manufacturing processes, and the cycle life of charge and discharge. The research focus has entered the stage of trying to achieve the mass production of large-scale production process development according to different applications, and the United States has a large number of college-derived start-ups, such as QuantumScape, SEEO, Solid Power, Solid Energy Systems, Ionic Materials, etc., these startups, with their advancement in solid-state battery technology, ensure that the United States enters the second echelon of global solid-state battery research; South Korea's three major battery manufacturers Samsung SDI, LG Chemistry, SK Innovation chose joint development.

At present, the development of China's solid-state batteries is in the early stage of industrialization. Although some enterprises have the mass production level of related products, the technology is still not mature enough, and the application fields are relatively narrow. There is still a section from the real industrialization of solid-state batteries. The road is going. Domestic companies engaged in solid-state lithium battery patent distribution include Jiangsu Qingtao Energy, BYD, Thornton New Energy, Haofeng Lithium Industry, Beijing Weilan, Guoxuan Hi-Tech, and Ningde Times. In addition, such as Wei Wei, Wan Xiang, Peng Hui Energy, Hengdian East Magnetic, etc. have also announced that they are involved in the field of solid-state batteries, but most enterprises are still in the planning and layout stage.

Academic Research

For the research of large-capacity, high-energy density, high-safety all-solid-state lithium batteries, domestic and foreign companies have been increasing their investment in recent years, and have made certain progress, and battery performance has also been greatly improved. On November 21, 2018, researchers at the University of Maryland constructed an electron/ion double-conducting solid frame as an effective host of a Li negative electrode by partially synthesizing a Li-Mg alloy negative electrode on a garnet-type solid electrolyte, and improved the solid Li negative electrode. Capacity, current density and cycle life. A record high cumulative capacity of 750 mAh/cm 2 was obtained in a garnet-type all-solid lithium battery. On December 4, 2018, the Oak Ridge National Laboratory reported that its researchers developed a highly sensitive technique to characterize and measure electrolyte and electrode interfaces by studying the internal workings of lithium-ion batteries.

China's academic research in this field is also constantly being explored. Tsinghua University, Beijing University of Science and Technology and other research institutes of the Chinese Academy of Sciences have made solid-state batteries a key point of research and development and strive to break through. The Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences has proposed a mixed solid electrolyte (HSE) film based on garnet (Li 7 La 3 Zr 2 O 12 ), which is designed for high performance solid state lithium batteries. The Beijing University of Science and Technology's High-tech Innovation Center for Materials and Genetic Engineering, Tsinghua University and the University of Texas at Austin have jointly developed two composite solid electrolytes with high electrical conductivity, high flexibility, high discharge capacity and excellent cycle performance. The Institute of Materials Technology and Engineering of the Chinese Academy of Sciences has developed a series of high-performance solid electrolyte materials, hybrid solid-liquid electrolyte cells based on in-situ solidification, and all-solid-state lithium battery cells, laying the foundation for the next generation of power battery technology.

In order to further promote the all-round development of China's solid-state batteries, we should start from the aspects of raw materials, technical routes, patent layout, industrial support and design and development, all aspects of coordinated development, production, study and research, to create a high-quality industrial chain.

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