| Literature DB >> 29028309 |
Xusheng Wang1, Kuangzhou Du1, Chao Wang1, Luxiang Ma1, Binglu Zhao1, Junfeng Yang1, Meixian Li1, Xin-Xiang Zhang1, Mianqi Xue2, Jitao Chen1.
Abstract
A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS5.7) cathode material. The lithiation products of metallic Mo and Li2S2 rather than Mo and Li2S species have been detected. This process could yield a high discharge capacity of 746 mAh g-1. Characterizations of the recovered molybdenum polysulfide after the delithiaiton process manifests the high reversibility of the unique conversion reaction, in contrast with the general irreversibility of the conventional conversion-type mechanism. As a result, the a-MoS5.7 electrodes deliver high cycling stability with an energy-density retention of 1166 Wh kg-1 after 100 cycles. These results provide a novel model for the design of high-capacity and long-life electrode materials.Entities:
Keywords: Li2S2; a-MoS5.7; high capacity; high energy density; reversible conversion reaction
Year: 2017 PMID： 29028309 DOI： 10.1021/acsami.7b12709
Source DB: PubMed Journal: ACS Appl Mater Interfaces ISSN： 1944-8244 Impact factor: 9.229