Hong LI received Ph.D degree in 1999 in the Institute of Physics, CAS. He is currently a professor in the same institute. He serves as Deputy director of Beijing National Laboratory for Condensed Matter Physics. Hong Li’s research is focused on developing nano-Si/C anode materials for high energy density Li-ion batteries, failure analysis of Li-ion batteries and rechargeable solid metal lithium batteries. Hong Li holds over fifty patents and published 260 peer-reviewed papers with a citation over 16000 times. He is in charge of the “High energy density Li batteries for electrical vehicles” project, a CAS strategic priority research program, and a “Materials and batteries for EV” project, a national key program. He serves as scientific committee member in direction of energy storage for MOST and MIIT. He is regional editor of Solid State Ionics and editor for Energy Storage Science and Technology (A Chinese journal).
Jie Huang1,2, Wenjun Li1,2, Jiaze Lu1, Jiliang Qiu1,Hanyu Xu1, Shigang Ling1, Jieyun Zheng1,2, Huigeng Yu2, Liquan Chen1,2, Hong Li1,2
1Institute of Physics, Chinese Academy of Sciences,Beijing 100190
2Beijing WeLion New Energy Ltd., Beijing, 102402
Developing rechargeable batteries with high energy density, safety, fast charging rate, long cyclic performance and low cost is highly desirable for many applications. Many new solutions seem promising, including 300Wh/kg Li-ion batteries using Si-based anode and Ni-rich cathode, solid lithium batteries, Li-S and Li-air batteries.
In view of commercialization and mass production, any new battery should satisfy all requirements from each application and has one item of outstanding performance at least. In addition, it would be better that the production is compatible with current automatic machines or only a few of machines have to be modified or redesigned. It is alos expected that the production speed is comparable to current level.
Safety is the top concern for developing high energy density batteries. Li-ion cell containing 15-25wt% nonaqueous electrolyte suffers from thermal runway, which may cause fire and explosion. It is believed that replacing liquid electrolyte with solid electrolyte part or all of them should improve the safety of the cell.
For solid batteries, one of the most difficult challenge is to maintain physical contact during thousands of charging and discharging cycles. This is not so easy since the active particles in anode or cathode will occur large and repeatable volume expansion and contraction. Solid electrolyte phase in cathode and anode should follow the volume variation of active particles, as in the case of liquid cell.
Based on above consideration, we purpose a combined solution, in situ solidifying interface in high energy density lithium batteries. The solid electrolyte interphase will be formed chemically or electrochemically in the cell. Part or all nonaqueous electrolyte will convert into solid electrolyte . Some preliminary results will be reported in this report.
In addition, efforts from CAS EV battery team on developing solid Li-ion, solid metalli lithium, solid Li-S and solid Li-air will be also reported.