Rigid-flexible coupling” Solid polymer batteries: From fundamental research to deep sea power system

 Guanglei Cui

 Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences

 

Abstract: Lithium ion batteries with liquid electrolyte might suffer from serious safety risk owing to highly volatile and combustible liquid carbonate organic solvents. Solid polymer electrolyte (SPE) is regarded as an ideal way to improve safety and reliability of lithium batteries. However, the quintessential frailty of PEO-SPE is its low ionic conductivity (ca. 10-8-10-6 S cm-1) at ambient temperature and relatively narrow electrochemical window (< 4 V). Herein, we developed high-performance and high-safety lithium batteries by using "rigid-flexible Coupling" solid electrolyte system. This system possesses high safety, long cycling life, and improved working depth. In addition, we also developed large-capacity solid lithium secondary battery (QIBEBT-Ⅰ) with NCM cathode and metallic lithium anode. The third-party authoritative test concluded that: energy density of > 250 Wh/kg, > 80% capacity after 500 cycles, a very good safety performance under several times of nail crush tests and other harsh tests. From Jan. 15th to Mar. 23th in 2017, the solid battery system (QIBEBT-Ⅰ) as the unique power supply was assembled on "Wanquan "lander and brought to the Mariana Trench by the Chinese Academy of Sciences deep-sea expedition team (9 times of successful dive, 6 times to reach the depth of 10,000 m, maximum dive depth of 10901 m). The cumulative working time and the longest continuous running time of QIBEBT-Ⅰare ~134 hours and ~20 hours, respectively. This successful demonstration marks that China has been the second successful country for the application of the full sea deep lithium secondary battery power system.

Biography: Prof. Guanglei Cui received his PhD from Institute of Chemistry, Chinese Academy of Sciences (CAS) in 2005. He then did his postdoctoral research at Max-Planck-Institute for Polymer Research and Max-Planck-Institute for Solid State Research before joining Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), CAS in 2009. He is currently a professor and the leader Biomimetics for Energy Storage Group, the director of Applied Energy Technology Division, and the deputy director of Academic Committee of QIBEBT. He is a recipient of the Hundred Talents Program of CAS, the Distinguished Young Scholars of Shandong Province in 2009, the Taishan Scholars of Shandong Province in 2015, the Distinguished Professor of CAS in 2015, and the National Science Fund for Distinguished Young Scholars in 2016. His research interests include electrochemical energy storage and conversion material.