An ultrathin and continuous Li_4Ti_5O_(12) coated carbon nanofiber interlayer for high rate lithium sulfur battery

作     者：Decheng An Lu Shen Danni Lei Lehong Wang Heng Ye Baohua Li Feiyu Kang Yan-Bing He Decheng An;Lu Shen;Danni Lei;Lehong Wang;Heng Ye;Baohua Li;Feiyu Kang;Yan-Bing He

作者机构：Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua University Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2019年第28卷第4期

页      面：19-26页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Key Basic Research Program of China (2014CB932400) the National Natural Science Foundation of China (51672156 and 51232005) Guangdong special support program (2015TQ01N401) Guangdong Province Technical Plan Project (2017B010119001 and 2017B090907005) Dongguan City (2015509119213) Shenzhen Technical Plan Project (JCYJ20170817161221958, JCYJ20170412170706047, JCYJ20170307153806471, and GJHS20170314165324888) 

主　　题：Lithium sulfur batteries Li4Ti5O12 (LTO) Interlayer Polysulfide adsorbent Polysulfide conversion 

摘      要：Severe capacity fading and poor high rate performance of lithium sulfur(Li–S) battery caused by shuttle effect and low conductivity of sulfur hampers its further developments and applications. Li_4Ti_5O_(12) (LTO)possesses high lithium ion conductivity, and it is also can be used as an active adsorbent for polysulfide. Herein, fine LTO particle coated carbon nanofibers(CNF) were prepared and a conductive network both for electron and lithium ion was built, which can greatly promote the electrochemical conversion of polysulfide and improve the rate performance of Li–S batteries. Meanwhile, a quantity of adsorption sites is constructed by defects of the surface of LTO-CNF membrane to effectively immobilize polysulfide. The multifunctional LTO-CNF interlayer could impede the shuttle effect and enhance comprehensive electrochemical performance of Li–S batteries, especially high rate performance. With such LTO-CNF interlayer,the Li–S battery presents a specific capacity of 641.9 mAh/g at 5 C rate. After 400 cycles at 1 C, a capacity of 618.0 mAh/g is retained. This work provides a feasible strategy to achieve high performance of Li–S battery for practical utilization.