Co-recrystallization induced self-catalytic Li2S cathode fully interfaced with sulfide catalyst toward a high-performance lithium-free sulfur battery  

作　　者：Zejian Li Chong Luo Siwei Zhang Guoming Sun Jiabin Ma Xinliang Wang Yan-Bing He Feiyu Kang Quan-Hong Yang Wei Lv 

机构地区：[1]Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,China [2]Beijing Key Laboratory of Environmental Science and Engineering,School of Material Science and Engineering,Beijing Institute of Technology,Beijing,China [3]Tsinghua-Berkeley Shenzhen Institute(TBSI),Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,China [4]School of Chemical Engineering and Technology,Tianjin University,Tianjin,China [5]Nanoyang Group,State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin,China [6]Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University,Fuzhou,China

出　　处：《InfoMat》2022年第10期102-114,共13页信息材料（英文）

基　　金：National Key Research and Development Program of China,Grant/Award Numbers:2018YFE0124500,2021YFF0500600;National Natural Science Foundation of China,Grant/Award Numbers:52022041,51932005;The Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program,Grant/Award Number:2017BT01N111;Shenzhen Basic Research Project,Grant/Award Number:JCYJ20180508152037520。

摘　　要：Lithium sulfide(Li_(2)S)is a promising cathode for a practical lithium-sulfur battery as it can be coupled with various safe lithium-free anodes.However,the high activation potential(>3.5 V)together with the shuttling of lithium polysulfides(LiPSs)bottleneck its practical uses.We are trying to present a catalysis solution to solve both problems simultaneously,specially with twinborn heterostructure to shoot off the trouble in interfacial contact between two solids,catalyst and Li_(2)S.As a typical example,a Co9S8/Li_(2)S heterostructure is reported here as a novel self-catalytic cathode through a co-recrystallization followed by a one-step carbothermic conversion.Co9S8 as the catalyst effectively lowers the Li_(2)S activation potential(<2.4 V)due to fully integrated and contacted interfaces and consistently promotes the conversion of LiPSs to suppress the shuttling.The obtained freestanding cathode of Co9S8/Li_(2)S heterostructures encapsulated in three-dimensional graphene shows a high capacity,reaching 92.6%of Li_(2)S theoretical capacity,high rate performance(739 mAh g1 at 2 C),and a low capacity fading(0.039%per cycle at 1 C over 900 cycles).Even under a high Li_(2)S loading of 12 mg cm^(-2)and a low E/S ratio of 5μL mgLi_(2)S^(-1),86%of theoretical capacity can be utilized.

关 键 词：carbothermal reduction heterostructures Li2S oxidation lithium-sulfur batteries polysulfides transformation self-catalytic cathode 

分 类 号：TM911[电气工程—电力电子与电力传动]