title: Phase Restructuring in Transition Metal Dichalcogenides for Highly Stable Energy Storage.
abstract: Achieving homogeneous phase transition and uniform charge distribution is essential for good cycle stability and high capacity when phase conversion materials are used as electrodes. Herein, we show that chemical lithiation of bulk 2H-MoS2distorts its crystalline domains in three primary directions to produce mosaic-like 1T' nanocrystalline domains, which improve phase and charge uniformity during subsequent electrochemical phase conversion. 1T'-LixMoS2, a macroscopic dense material with interconnected nanoscale grains, shows excellent cycle stability and rate capability in a lithium rechargeable battery compared to bulk or exfoliated-restacked MoS2. Transmission electron microscopy studies reveal that the interconnected MoS2nanocrystals created during the phase change process are reformable even after multiple cycles of galvanostatic charging/discharging, which allows them to play important roles in the long term cycling performance of the chemically intercalated TMD materials. These studies shed light on how bulk TMDs can be processed into quasi-2D nanophase material for stable energy storage.
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.|Solar Energy Research Institute of Singapore (SERIS) , 7 Engineering Drive 1, Singapore 117574.
authors.forename: Kai
authors.initials: K
authors.lastname: Leng
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
authors.forename: Zhongxin
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
authors.forename: Xiaoxu
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
authors.forename: Wei
authors.initials: W
authors.lastname: Tang
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Tian
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.
authors.forename: Chang Tai
authors.initials: CT
authors.lastname: Nai
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Wu
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543.|Center for Advanced 2D Materials and Graphene Research Centre , 2 Science Drive 2, Singapore 117526.
authors.forename: Kian Ping
authors.initials: KP
authors.lastname: Loh
keywords: 2D materials; energy storage; lithium ion batteries; phase engineering; transition metal dichalcogenides