18650 battery 4800mah.The energy density of lithium-sulfur batteries has exceeded 500Wh/kg

　　"In terms of cathode materials for lithium-sulfur batteries, we use a double 'Fisher esterification' module assembly method to assemble dispersed conductive carbon into an ellipsoid-shaped micron superstructure, which significantly increases the sulfur loading per unit area of the cathode. , the battery energy density reaches 545Wh/kg." Wu Feng, academician of the Chinese Academy of Engineering and professor of Beijing Institute of Technology, recently introduced the latest progress of his research team in the research of new materials for lithium batteries.

　　In addition to lithium-sulfur batteries, Academician Wu Feng also introduced that Peking University and other units have also made breakthroughs in the research of high specific volume lithium-rich manganese-based materials. “Our team has also conducted a series of research on bionic membrane design, improving material stability through interface protection, building selective lithium ion channels, and improving material rate performance,” he said.

　　In terms of power battery safety, Academician Wu Feng's research team started with materials, including developing temperature-sensitive electrodes, ceramic high-strength separators, safety electrolytes, etc., which significantly improved the intrinsic safety of batteries. A new generation of gel solid electrolyte based on nano-TiO2 and ionic liquid has also been developed, which has high room temperature conductivity and significant safety (non-flammable at 1300°C/60s).

　　Academician Wu Feng said that electrolyte is one of the main factors affecting the safety of lithium ions. As it develops towards solid state, he believes that it has not yet reached full solid state. The research team he led has developed a new ion condensation device with a new bionic ant nest structure. The gel electrolyte forms a protective layer on the surface of lithium metal, which can effectively inhibit the growth of lithium dendrites. He said that research on bionic battery materials is conducive to the greening of the battery itself.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%

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　　Academician Wu Feng has long been engaged in the research and development of new secondary batteries and related energy materials. He was the first to propose the academic idea of using light elements, multi-electrons, and multi-ion reaction systems to achieve a leap-forward increase in battery energy density, and developed a new high-specific energy secondary battery. The system and key materials have attracted the attention and high praise of international peers.

　　Academician Wu Feng independently developed a series of key new materials for lithium-ion batteries, new battery preparation processes and battery safety technologies, providing technical support for the upgrading of China's lithium battery industry and entering the international high-end product market; he proposed the collaboration of a series of key materials To improve the intrinsic safety of batteries, he invented safety electrodes, composite ceramic polymer separators, and electrolyte systems with flame retardancy and electrochemical compatibility; he was the first to propose the concept of battery system safety threshold boundaries, and developed identification and Control Technology.

　　It is worth mentioning that Academician Wu Feng invented lithium-containing hydrogen storage alloys and their preparation methods, breaking foreign patent monopoly on hydrogen storage alloys, presided over the creation of China's first nickel-metal hydride battery pilot base, and achieved industrialization Integrating key technologies, we designed and built China's first automated nickel-metal hydride battery demonstration production line; we developed a series of nickel-metal hydride power battery packs and successfully applied them to a variety of hybrid vehicles.

　　Focusing on the country's major needs, Academician Wu Feng explored the technological integration of different secondary battery systems and made innovative breakthroughs in battery reaction theory, key materials and engineering technology, making important contributions to the industrial development of secondary batteries in China. . Some members of the 973 and 863 basic and applied research teams led by Academician Wu Feng have become leaders in the field of secondary batteries and new energy materials in my country.

　　Wu Feng was elected as an academician of the International Eurasian Academy of Sciences in 2014; in 2016, he received the first Lifetime Achievement Award issued by the International Automotive Lithium Battery Association (IALB); in 2017, he was elected as an academician of the Asia-Pacific Academy of Materials Sciences and an academician of the Chinese Academy of Engineering. He served as a member and deputy leader of the National High Technology (863) Functional Materials Expert Group, a member and standing committee member of the National High Technology (863) New Materials Expert Committee, the leader of the National Ministry of Science and Technology’s Nickel-Hydrogen Battery Expert Group and the National High Technology (863) ) Expert of the overall group of major electric vehicle projects.

　　Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%

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　　Wu Feng is currently the vice chairman of the China Battery Industry Association, the vice chairman of the China Chemical and Physical Power Source Industry Association, the chairman of the expert committee of the power battery application branch, and the member of the new energy vehicle access expert committee of the Ministry of Industry and Information Technology; he has served as the Sino-US electric vehicle expert for 12 consecutive times. Chairman of the Battery Technology Seminar, and 6 times chairman of the International Forum on Power Lithium Battery Technology and Industry Development.

　　Facing the development status of the domestic power battery industry, Academician Wu Feng believes that the current situation of China's power batteries is overall overcapacity and insufficient high-quality production capacity, and there is an urgent need for further innovation and development in order to achieve disruptive technological breakthroughs. However, you must know that a truly disruptive innovation that starts from basic research does not happen overnight and cannot be rushed. Sometimes it takes five, ten, or fifteen years, or even longer.

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