Anion hybrid strategy New battery successfully -Lithium - Ion Battery Equipment

Anion hybrid strategy New battery successfully developed -Lithium - Ion Battery Equipment

Recently, Tang Yongbing, a researcher in the Research Center for Functional Thin Film Materials of the Institute of Integration, Shenzhen Academy of Advanced Technology, Chinese Academy of Sciences (the first unit communication), and Li Zhensheng, a professor of City University of Hong Kong (joint communication) successfully developed a new battery based on anion hybrid strategy. The related research achievement "Hybrid Anions to wards Fast Diffusion Kinetics for Tri Ion Batteries with Significantly Improved Rate Capability and CyclingLife" has been published online in the materials journal Journal of Materials Chemistry A (J. Matter. Chem. A, 2019, DOI: 10.1039/C9TA03104A, HotPaper).

Due to the advantages of high working voltage, low cost, environmental protection and easy recovery, the dual ion battery has a good application prospect in energy storage and other fields, and has become a hot research topic for scientists at home and abroad in recent years. Generally, the double ion battery adopts graphite cathode materials, which conduct reversible intercalation/deinking reaction of anions during charging and discharging. However, the anions reported in the current research are mostly anion ions with large ion radius, such as PF6 -, TFSI -, etc. The diffusion kinetics of these ions is slow, which leads to the improvement of the rate performance of the double ion battery.(Lithium - Ion Battery Equipment)

In order to improve the dynamics and stability of anion intercalation, Tang Yongbing and his team members Shen Jingshou, Zhang Fan, Ou Xuewu and others proposed an anion hybrid strategy for the first time, and successfully constructed a Li+/PF6 -/BF4 - based multi ion battery. Electrochemical test and theoretical calculation research show that by hybridizing appropriate amount of BF4 anions with small ionic radius, the diffusion energy barrier can be significantly reduced, and the diffusion kinetics can be improved, thus greatly improving the magnification and cycle performance of the battery. The capacity retention rate of the battery reached 92.5% under the high current density of 15C (4 minutes of charging); After 500 cycles under the current density of 5C, the capacity almost has no attenuation. The anion hybrid strategy provides a new idea for the development of efficient and low-cost energy storage devices.

The research was supported by the National Natural Science Foundation for Distinguished Young Scholars, Guangdong Science and Technology Program, Shenzhen Science and Technology Program, etc.



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