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Qingdao Energy Institute has developed a new type of lithium-sulfur (selenium) battery system with double carbon and double active materials

 Last Update: 2021-09-13
 Source: Internet
 Author: User

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lithium deposits

electrical energy storage

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In recent years, with the promotion and application of electric vehicles, new requirements and challenges have been put forward for electrochemical energy storage devices
.

Traditional lithium-ion batteries are limited by the lower theoretical capacity of electrode materials, and are difficult to meet the requirements of high-energy-density energy storage systems

However, the inherent shortcomings of lithium-sulfur batteries hinder its continued promotion and application: due to the low conductivity of elemental sulfur and polysulfur compounds (Li ₂ S/Li ₂ S ₂ ), which is a reduction product , the active material in lithium-sulfur batteries is utilized Low rate and poor rate performance; the soluble polysulfur compounds produced during the charge and discharge process cause the "shuttle effect" to appear and reduce the cycle life of the battery
.

Therefore, the development of cathode materials with high conductivity and strong weakening ability to the "shuttle effect" is a key technology for obtaining high-performance lithium-sulfur batteries

₂₂₂

Wu Jianfei, a researcher from the Advanced Energy Storage Materials and Technology Research Group of Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, has been deeply involved in the field of lithium-sulfur batteries, and has proposed a variety of solutions to the intrinsic defects of lithium-sulfur batteries, and has achieved a series of innovative research results (Journal of Materials Chemistry A, 6 (2018), 23486-23494; Electrochimica Acta, 295 (2019), 684-692; ACS Applied Materials & Interfaces, 11 (2019), 15607-15615; Advanced Materials Interfaces, 2020, 2001698 )
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Previous studies have found that the selenium element of the same family as sulfur has a conversion reaction mechanism similar to that of sulfur, and the "shuttle effect" of lithium-selenium batteries can be significantly suppressed

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This research provides a new reference idea for solving the intrinsic defects of lithium-sulfur batteries and lays a foundation for the research and application of chalcogen elements in lithium metal batteries
.

Recently, related research results were published in Chemical Engineering Journal under the title Novel Lithium-Chalcogenide Batteries Combining S, Se and C Characteristics Supported by Chitosan-Derived Carbon Intertwined with CNTs

Qingdao Energy Institute has developed a new type of lithium-sulfur (selenium) battery system with double carbon and double active materials

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