Tang Yongbing team of Shenzhen Advanced Institute of Chinese Academy of Sciences has developed an efficient flexible dual ion battery based on modified gel polymer electrolyte.

Recently, Tang Yongbing, a researcher with the center of functional membrane materials research, Shenzhen Institute of advanced technology, China Academy of Sciences, and his research team successfully developed a highly efficient flexible dual ion battery based on modified gel polymer electrolyte Relevant research results "a flexible dual ion battery based on pvdf-hfp-modified gel polymerhelectrolyte with excellent cycling performance and superior rate capability" have been published online in the international journal advanced energy materials, 2018, 8, 1801219 Lithium ion battery (LIB) is a leading market in consumer electronics and electric vehicles due to its advantages of high energy density, long cycle life, small memory effect and low self discharge However, due to the low voltage platform of negative graphite, lithium dendrites are easy to form during the battery cycle, which increases the risk of short circuit, and the organic liquid electrolyte in conventional lib is flammable, which leads to serious safety problems Therefore, the solid-state battery with inorganic solid electrolyte or polymer electrolyte has attracted more and more attention due to its incombustibility and high safety, and the polymer electrolyte battery based on high ionic conductivity is more suitable for practical application On the other hand, the double ion battery (DIB) has been widely concerned because of its high working voltage, low cost, environmental protection and easy recovery However, the cycle stability of most dibs needs to be improved due to the decomposition of conventional electrolytes under high operating voltage Figure (a) cycle curve of 2000 times of charging and discharging of new flexible double ion battery at 5C; (b) working stability of flexible double ion battery in different folded states; (c) stability of flexible double ion battery at different temperatures In order to solve the above problems, Tang Yongbing and his team members Chen Guanghai, Zhang Fan, etc recently developed a PVDF-HFP Poly (ethylene oxide) (PEO) and graphene oxide (GO) codoped gel electrolytes (PHPG) The phpg copolymer shows a 3D porous network structure and has a high ionic conductivity (2.1 × 10-3scm-1), which is conducive to the transport of Li + and PF 6 - The results show that the new double ion battery based on the gel electrolyte has excellent rate performance and cycle stability The battery has a high average discharge voltage of 4 V, and the capacity retention rate is 92% when the charge rate is 5 C and the charge discharge cycle is 2000 times In addition, the battery also has good flexibility and thermal stability, and can work normally in the environment of up to 90 ° C The high efficiency flexible double ion battery has a broad application prospect in wearable electronic equipment and other fields The research was supported by NSFC, Guangdong science and technology program, Shenzhen Science and technology program, etc.