Provide new ideas for the design of high-performance energy storage devices

Xining, China News Service, December 12 (Reporter Sun Rui) On December 12, the reporter learned from the Qinghai Provincial People's Government - the Institute of Plateau Science and Sustainable Development of Beijing Normal University (hereinafter referred to as the Academy of Higher Sciences) that the Institute's "plateau green energy R&D and application innovation team" has made progress in the research of lithium-sulfur batteries.



It is reported that since the establishment of the "plateau green energy R&D and application innovation" team, the institute has focused on green development and application technology, produced a number of valuable achievements, driven a number of young and middle-aged scientific research backbone in the university, and effectively supported the construction of the physics discipline of Qinghai Normal University.



In recent years, lithium-sulfur battery (LBS) has attracted widespread attention because of its high theoretical capacity density and energy density, as well as rich sulfur resources.



However, the closing effect of soluble lithium polysulfide (LiPSs) often hides their commercial feasibility, resulting in the loss of active materials and the rapid attenuation of capacity during cycling. The electric field generated by ferroelectric materials is often used in energy storage devices to enhance the electrochemical reaction dynamics of energy storage devices through electrostatic interaction. However, traditional ferroelectric materials are difficult to be commercially available due to their insulating properties.



In response to the above problems, the above team proposed a new strategy to introduce electrostatic interaction by polarizing polyvinylidene fluoride (PVDF) adhesive used for the C/S cathode of lithium-sulfur batteries.



At the same time, with the increasing demand for large-capacity energy storage equipment such as electric vehicles and portable electronic products, lithium-ion batteries are becoming increasingly inadequate due to the limited energy density. Among various new secondary batteries, lithium-sulfur battery (LBS) has attracted great interest because of its high theoretical specific capacity, high energy density and rich sulfur reserves on the earth. The scientific research team proposed to introduce vacancies in the base of MoS2 to improve the electrochemical performance of lithium-sulfur batteries.



The results show that CNF @ MoS2-x/ZnS-S composite cathode exhibits high initial discharge specific capacity, excellent rate performance and ultra-high cycle. This study provides a new idea for the design of defect-rich electrode materials for high-performance energy storage devices. (End)