The "Nanjing Normal University Secondary Battery Forum" hosted by professor Zhou Xiaosi from the School of Chemistry and Materials Science of Nanjing Normal University ended successfully in Nanjing on December 12, 2020. This forum invited 17 distinguished and excellent young scholars, namely professor Cao Yuliang of Wuhan University, researcher Cheng Xinbing of Tsinghua University, researcher Cui Guanglei of Qingdao Institute of Energy of Chinese Academy of Sciences, professor Hu Xianluo of Huazhong University of Science and Technology, professor Ji Xiaobo of Central South University, researcher Li Feng of Institute of Metal Research of Chinese Academy of Sciences, professor Li Fujun of Nankai University, professor Lu Yingying of Zhejiang University, researcher Ming Jun of Changchun Institute of Applied Chemistry Chinese Academy of Sciences, professor Tao Xinyong of Zhejiang University of Technology, researcher Wang Yonggang of Fudan University, professor Wu Yuping of Nanjing University of Technology, professor Yan Chenglin of Soochow University, professor Yang Chenghao of South China University of Technology, professor Yang Yong from Xiamen University, professor Yu Xiqian from the Institute of Physics of the Chinese Academy of Sciences, and professor Yu Yan from the University of Science and Technology of China. The forum was hosted by professor Zhou Xiaosi, professor Li Yafei, associate professor Wu Ping, and postdoctoral fellow Liao Jiaying. It was opened by Professor Shen Jian, Director of the National and Local Joint Engineering Research Center for Biomedical Functional Materials. Teachers and more than 200 graduate students from related majors of the Academy of Chemical Sciences participated in this seminar.
Professor Shen Jian delivered a welcome speech at the opening ceremony. Mr. Shen briefly introduced the research progress made by his research group in recent years, and looked forward to the future direction of the research group. Finally, He wish this academic forum a complete success.
In this forum, the participating experts discussed cutting-edge issues such as battery electrode materials, electrolytes, electrolytes, and interfaces, focusing on academic research hotspots, and discussing problems and applications in the field of secondary batteries.
Researcher Li Feng from the Institute of Metal Research of the Chinese Academy of Sciences report entitled "Solid Electrolyte for Metal Lithium Anode". Mr. Li first raised the problem of dendrites and Coulomb efficiency of lithium metal anodes, and then proposed effective strategies to realize lithium anode applications from both short-term and long-term perspectives, using lithium polysulfide and succinonitrile to improve the work of polymer solid electrolytes. The formation of a homogeneous and rapid ion path on the scale of ion transport is realized, and a PEO solid electrolyte with a wide temperature range and high conductivity is obtained to improve its electrochemical performance. These works provide new ideas for the application of lithium metal anodes.
Professor Yu Yan from University of Science and Technology of China gave a report entitled "Design of Alkali Metal-Sulfur (Selenium) Battery Materials and Energy Storage Mechanism". Professor Yu’s potassium-sulfur/selenium battery is facing more severe challenges, and then introduced that his subject group has recently developed a high specific capacity by clarifying the potassium storage mechanism of sulfur/selenium electrodes, designing the composition of materials and constructing special micro-nano structures , Potassium-sulfur/selenium battery system with long cycle life and high rate performance.
Professor Yan Chenglin from Soochow University gave a report entitled "Energy Material Table Interface and Physical Property Control". Teacher Yan introduced the experimental ideas of his subject, and verified the electrochemical mechanism of the new material system he proposed through theoretical calculations and a series of advanced in-situ testing techniques.
Professor Yang Chenghao from South China University of Technology gave a report entitled "Grain Boundary Regulation of Battery Materials". Professor Yang introduced the research progress of his research group in the preparation of long-life high-performance lithium-ion battery cathode materials, and revealed the influence mechanism of high-density grain boundaries on inhibiting the phase transition of high-capacity layered oxide cathode materials during charge and discharge. A new method for controlling the grain boundaries of secondary particles of advanced battery cathode materials is proposed.。
Professor Cao Yuliang from Wuhan University gave a report entitled "Discussion on Some Electrochemical Problems of Energy Storage Sodium Ion Batteries". Professor Cao first launched a report on the current hot issues of sodium-ion batteries, and then introduced the latest progress made by his group in sodium-ion battery energy storage systems.
Professor Hu Xianluo of Huazhong University of Science and Technology gave a report entitled "High Temperature Resistant Lithium Ion Battery and Its Key Materials". Teacher Hu said that lithium-ion has been widely used, but there are still many problems worthy of our in-depth study. Letting lithium-ion batteries continue to work at high temperatures is the goal of their research group.
Professor Ji Xiaobo from Central South University gave a report entitled "Efficient Design and Regeneration of Lithium Battery Cathode Materials". Teacher Ji introduced the research results of his research team in designing high-efficiency lithium battery cathode materials and making them sustainable development, and looked forward to the development of high-efficiency cathode materials.
Researcher Li Fujun from Nankai University reported on the title "New Metal Air Battery". Mr Li introduced the introduction of light into zinc-air and lithium-air batteries, clarified the oxygen electrode reaction mechanism of light participation, reduced battery charge and discharge overpotentials, and realized the conversion of light energy into electrical and chemical energy in metal-air batteries. It provides new ideas for constructing efficient and stable sodium ion batteries.
Professor Yang Yong from Xiamen University gave a report entitled "Electrochemical Energy Storage Systems: Materials, Mechanisms and Characterization Methods". Prof. Yang introduced the electrode material and its reaction mechanism in the charge and discharge process, and recommended efficient characterization methods for everyone.
Professor Tao Xinyong from Zhejiang University of Technology gave a report entitled "Biomass-based Battery Materials". Professor Tao mainly introduced his research team combined with cryo-electron microscopic observations, trying to use green biomass materials to solve the shuttle effect of polysulfides and uncontrollable growth of lithium dendrites, and achieved a series of research results.
Researcher Yu Xiqian from the Institute of Physics, Chinese Academy of Sciences report entitled "High Voltage Lithium Cobalt Oxide Cathode Material". Mr. Yu briefly introduced the importance of developing high-volume energy density cathode materials, and analyzed the basic scientific and technical problems existing in high-voltage lithium cobalt oxide. It is hoped that the cycle stability of lithium cobalt oxide materials under high voltage can be improved by adjusting the bulk structure of the material and the surface composition modification, exploring the application limit of lithium cobalt oxide, and maximizing the energy of the material while taking into account safety density and electrochemical performance.
The report by researcher Lu Yingying of Zhejiang University is entitled "High Energy Density Metal Lithium Battery and Its Negative Electrode Protection Mechanism". Mr. Lu explained the main technical bottlenecks for batteries to achieve high energy density. Through reasonable interface design, electrode three-dimensionalization, electrolyte additives and other ideas, solve the safety problems of lithium dendrite formation and electrode expansion in metal lithium batteries, and design and develop metal lithium batteries with high energy density and high safety performance to achieve high efficiency Energy storage.
Professor Wu Yuping from Nanjing University of Technology gave a report entitled "Frontier Development of Lithium Battery Separator Technology". Professor Wu first introduced the advantages and disadvantages of the electrochemical energy storage system, and then introduced a series of research results made by his research group in two aspects: high energy density batteries and high power density supercapacitors.
Cui Guanglei, a researcher at the Qingdao Institute of Energy, Chinese Academy of Sciences, gave a report entitled "Sulphide/polymer composite solid electrolyte with both rigidity and flexibility". Mr. Cui introduced the research progress of his research group in solid electrolytes. The concept of "rigid and flexible" solid electrolytes greatly stimulated everyone's interest.
The report by Fudan University researcher Wang Yonggang is entitled "The Application of Organic Electrode in Electrochemical Energy Storage and Conversion". Teacher Wang explained that compared with traditional electrodes, organic electrodes have the characteristics of not being restricted by metal mineral reserves, and low toxicity or environmentally friendly and sustainable development. Subsequently, the research work of his research group on the charge storage mechanism of organic electrodes was introduced.
The report by Ming Jun, a researcher from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, is entitled "Modeling of Electrolyte and Electrode Interface". Teacher Ming said that cognition and analysis of electrolytes and understanding of the interface behavior of electrolytes on the surface of electrode materials are current research difficulties in the field of lithium-ion batteries. Based on this, Mr. Ming proposed for the first time the importance of the metal ion solvation structure and the solvation structure simplified formula for studying the coordination chemistry of the electrolyte and understanding the stability of the electrode. At the same time, Mr. Ming also made his own insights and analysis on the details of how to design the electrolyte, how to understand the decomposition process of the electrolyte, and determine the stability of the electrolyte.
Finally, Cheng Xinbing, a researcher at Tsinghua University, gave a report entitled "High-performance Lithium Metal Battery: Failure Mechanism and Construction Strategy". Teacher Cheng systematically explained why the battery failed, and put forward effective strategies for how to avoid this phenomenon, which aroused strong curiosity of the audience.
The secondary battery forum was successfully concluded under the auspices of professor Tang Yawen and professor Zhou Xiaosi. The reports of the 17 experts who participated in the conference were wonderful and vivid, providing excellent opportunities for graduate students to accumulate knowledge. The active atmosphere of on-site interaction also narrowed the distance between students and experts, stimulated graduate students' interest in the research of chemical material synthesis and its potential reaction mechanism, broadened the academic horizons of teachers and students, and increased students' knowledge. At the same time, this conference also promoted the exchange and development between the School of Chemistry and Materials Science and high-level and high-level schools.