Chen, Jingwei Mohrhusen, Lars Ali, Ghulam Li, Shaohui Chung, Kyung Yoon Al-Shamery, Katharina Lee, Pooi See 2024-01-19T20:34:27Z 2024-01-19T20:34:27Z 2021-09-02 2019-02-14 1616-301X https://pubs.kist.re.kr/handle/201004/120348 Sodium ion batteries (SIBs) are promising alternatives to lithium ion batteries with advantages of cost effectiveness. Metal sulfides as emerging SIB anodes have relatively high electronic conductivity and high theoretical capacity, however, large volume change during electrochemical testing often leads to unsatisfactory electrochemical performance. Herein bimetallic sulfide Cu2MoS4 (CMS) with layered crystal structures are prepared with glucose addition (CMS1), resulting in the formation of hollow nanospheres that endow large interlayer spacing, benefitting the rate performance and cycling stability. The electrochemical mechanisms of CMS1 are investigated using ex situ X-ray photoelectron spectroscopy and in situ X-ray absorption spectroscopy, revealing the conversion-based mechanism in carbonate electrolyte and intercalation-based mechanism in ether-electrolyte, thus allowing fast and reversible Na+ storage. With further introduction of reduced graphene oxide (rGO), CMS1-rGO composites are obtained, maintaining the hollow structure of CMS1. CMS1-rGO delivers excellent rate performance (258 mAh g(-1) at 50 mA g(-1) and 131.9 mAh g(-1) at 5000 mA g(-1)) and notably enhanced cycling stability (95.6% after 2000 cycles). A full cell SIB is assembled by coupling CMS1-rGO with Na3V2(PO4)(3)-based cathode, delivering excellent cycling stability (75.5% after 500 cycles). The excellent rate performance and cycling stability emphasize the advantage of CMS1-rGO toward advanced SIB full cells assembly. English WILEY-V C H VERLAG GMBH GRAPHENE OXIDE COMPOSITE SUPERIOR RATE CAPABILITY CHEVREL-PHASE COMPOUND X-RAY-ABSORPTION LONG-CYCLE LIFE ANODE MATERIAL HIGH-CAPACITY STRUCTURAL-CHARACTERIZATION BATTERIES PERFORMANCE Electrochemical Mechanism Investigation of Cu2MoS4 Hollow Nanospheres for Fast and Stable Sodium Ion Storage Article 10.1002/adfm.201807753 1 ADVANCED FUNCTIONAL MATERIALS, v.29, no.7 ADVANCED FUNCTIONAL MATERIALS 29 7 scie scopus 000459719800021 2-s2.0-85059350465 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article GRAPHENE OXIDE COMPOSITE SUPERIOR RATE CAPABILITY CHEVREL-PHASE COMPOUND X-RAY-ABSORPTION LONG-CYCLE LIFE ANODE MATERIAL HIGH-CAPACITY STRUCTURAL-CHARACTERIZATION BATTERIES PERFORMANCE bimetallic sulfides in situ X-ray absorption spectroscopy sodium ion battery anodes