The energy density of lithium-sulfur battery has exceeded 500Wh/kg
"In the lithium-sulfur battery cathode material, we use the double 'Fisher esterification' module assembly method to assemble the dispersed conductive carbon into an ellipsoidal micro-superstructure, which significantly increases the sulfur loading per unit area of the positive electrode. The energy density of the battery reaches 545Wh/kg.” Wu Feng, an academician of the Chinese Academy of Engineering and a professor at 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 capacity lithium-manganese-based materials. “Our team has conducted a series of studies on biomimetic membrane design, improving material stability through interface protection, constructing selective lithium ion channels, and improving material rate performance,” he said.
In terms of power battery safety, Wu Feng's research team started with materials, including the development of temperature-sensitive electrodes, ceramic high-strength separators, and safety electrolytes, which significantly improved the intrinsic safety of the battery. A new generation of gel-based solid electrolyte based on nano-TiO2 and ionic liquid has also been developed, which has high room temperature conductivity and remarkable safety (1300 ° C / 60 s non-combustible).
Academician Wu Feng said that electrolytes are one of the main factors affecting the safety of lithium ions. In the direction of solid-state development, he believes that it is not yet fully solid. The research team led by him has developed a new type of ion condensation for the new biomimetic ant colony structure. The gel electrolyte forms a protective layer on the surface of the lithium metal, which can effectively inhibit the growth of lithium dendrites. He said that the study of battery materials in bionics is conducive to the greening of the battery itself.
Academician Wu Feng has long been engaged in the research and development of new secondary batteries and related energy materials. He has pioneered the academic idea of using light-element, multi-electron and multi-ion reaction systems to achieve a leap-forward increase in battery energy density, and developed a new high-energy secondary battery. The system and key materials have received high attention and high praise from international counterparts.
Academician Wu Feng independently developed a series of key new materials for lithium-ion batteries, new battery preparation technology and battery safety technology, providing technical support for the upgrading of China's lithium battery industry and entering the international high-end product market; In order to improve the intrinsic safety of the battery, a safety electrode, a composite ceramic polymer separator, an electrolyte system with flame retardancy and electrochemical compatibility were invented; the concept of the safety threshold of the battery system was first proposed, and the identification and development were developed. Control Technology.
It is worth mentioning that Academician Wu Feng invented the lithium-containing hydrogen storage alloy and its preparation method, broke the monopoly of foreign patents on hydrogen storage alloys, presided over the establishment of China's first nickel-hydrogen battery pilot test base, and realized industrialization. The key technology integration, design and construction of China's first nickel-hydrogen battery automatic demonstration production line; developed a series of nickel-hydrogen battery packs, and successfully applied to a variety of hybrid vehicles.
Academician Wu Feng explored the technological integration among different secondary battery systems around the country's major needs, and made innovative breakthroughs in battery reaction theory, key materials and engineering technologies, and made important contributions to the industrialization of secondary batteries in China. . Some of the 973 and 863 basic and applied research team members led by Academician Wu Feng have become the leading figures in the field of secondary batteries and new energy materials in China.
Wu Feng was elected as an academician of the International Eurasian Academy of Sciences in 2014; he was awarded the Lifetime Achievement Award for the first time in 2016 by the International Automotive Lithium Battery Association (IALB); in 2017, he was elected as an academician of the Asia-Pacific Academy of Materials Science and a member of the Chinese Academy of Engineering. He used to be a member of the National High-Tech (863) Functional Materials Expert Group, deputy leader, member of the National High-Tech (863) New Materials Expert Committee, member of the Standing Committee of the National Science and Technology Ministry of Nickel-Hydrogen Battery Expert Group and National High Technology (863). An expert in the major group of electric vehicles.
Wu Feng is currently the vice chairman of the China Battery Industry Association, the vice chairman of the China Chemical and Physical Power Industry Association, the chairman of the expert committee of the Power Battery Application Branch, the member of the New Energy Vehicle Access Expert Committee of the Ministry of Industry and Information Technology, and the 12th consecutive China-US electric vehicle. Chairman of the Battery Technology Symposium and 6 times as Chairman of the International Forum on Power Lithium 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 battery is the overall overcapacity, insufficient quality production capacity, and urgent need for further innovation and development, in order to achieve a disruptive technological breakthrough. However, we must know that a subversive innovation that is truly done from basic research is not a one-off success. It cannot be rushed for success. Sometimes it takes five or ten years or fifteen years, or even longer.
On November 15-17, 2019, Academician Wu Feng will participate in the 4th International Summit on Power Battery Applications (CBIS2019) organized by China Chemical and Physical Power Industry Association Battery China Network and Tianjin Lishen Battery Co., Ltd. in Tianjin. )" and served as the chairman of the conference. At that time, nearly 1,000 industry players from the power battery industry chain will jointly develop the domestic power battery industry, overseas development opportunities in Europe, Southeast Asia, etc., and some industry standards, materials, equipment, and vehicles. We will conduct in-depth discussions on specific issues such as new technologies and applications, safety requirements for new energy vehicles, and look forward to your participation.