The top journal of chemistry, "German Applied Chemistry", recently published online the Institute of Chemistry and Molecular Sciences of Wuhan University, Deng Hexiang, Ke Fusheng team lithium-sulfur battery (Li-S) breakthrough research results.
In this study, conductive polymers (CPs) and metal-organic frameworks (MOFs) were used as composite electrodes. The lithium-sulfur battery was first realized for 1,000 cycles at a charge and discharge current of 16.8 A/g, revealing that MOF materials are used in electrochemical energy storage devices. Great application prospects, selected by the magazine agency as VIP articles, and selected as internal cover shows.
The paper is entitled Metal–Organic Frameworks for High Charge–Disge Rates in Lithium–Sulfur Batteries. Deng Hexiang, Ke Fusheng is the author of the communication, PhD student Jiang Haoqing, Master student. Liu Xiaochen is the co-first author. Other authors include graduate students Yan Yushan, Gong Yi, and Shu Yufei.
For a long time, the application of MOF materials has focused on gas separation, storage, catalysis and other fields. Due to conductivity restrictions, MOF has less attention in electrochemical applications. How to fully exploit the advantages of MOF polar ion transport channels and improve conductivity The decisive significance. The traditional path is the direct design of the synthetic conductive MOF. The researchers did not use this route, but instead compounded the conductive polymer with the MOF and succeeded in increasing the conductivity by 7 orders of magnitude. The composite is used as a lithium-sulfur battery cathode at 10.0. C (16.8 A/g) has a capacity of 440 mAh/g after 1000 cycles of charge and discharge at a high current density, and the rate performance is superior to that of conventional carbon-based sulfur-loaded materials. By comparing various pore topologies, the researchers discovered for the first time. The pore structure of MOF has an important influence on the electrochemical performance under high magnification. MOF with a transparent cross structure is very beneficial to ion diffusion, and its large rate charge-discharge performance is best.
Comparison of the Pros and Cons of Conductive Polymer-MOF Composites and Comparative Materials during Charge and Discharge Processes and Long-Cycle Test Curves at High Magnification of 10.0 C
The study was supported by the China Youth Ministry's Youth Initiative, the Fund's major research program key projects, the incubation project, the fund's commission project, key projects in Hubei Province, the Wuhan Institute of Suzhou Research Project and Wuhan University's innovation team project support.