• 文献标题:   Vertically Aligned MoS2 Nanosheets Patterned on Electrochemically Exfoliated Graphene for High-Performance Lithium and Sodium Storage
  • 文献类型:   Article
  • 作  者:   WANG G, ZHANG J, YANG S, WANG FX, ZHUANG XD, MULLEN K, FENG XL
  • 作者关键词:   graphene, liion batterie, mos2, naion batterie, vertically aligned structure
  • 出版物名称:   ADVANCED ENERGY MATERIALS
  • ISSN:   1614-6832 EI 1614-6840
  • 通讯作者地址:   Tech Univ Dresden
  • 被引频次:   102
  • DOI:   10.1002/aenm.201702254
  • 出版年:   2018

▎ 摘  要

Molybdenum disulfide (MoS2) has been recognized as a promising anode material for high-energy Li-ion (LIBs) and Na-ion batteries (SIBs) due to its apparently high capacity and intriguing 2D-layered structure. The low conductivity, unsatisfied mechanical stability, and limited active material utilization are three key challenges associated with MoS2 electrodes especially at high current rates and mass active material loading. Here, vertical MoS2 nanosheets are controllably patterned onto electrochemically exfoliated graphene (EG). Within the achieved hierarchical architecture, the intimate contact between EG and MoS2 nanosheets, interconnected network, and effective exposure of active materials by vertical channels simultaneously overcomes the above three problems, enabling high mechanical integrity and fast charge transport kinetics. Serving as anode material for LIBs, EG-MoS2 with 95 wt% MoS2 content delivered an ultrahigh-specific capacity of 1250 mA h g(-1) after 150 stable cycles at 1 A g(-1), which is among the highest values in all reported MoS2 electrodes, and excellent rate performance (970 mA h g(-1) at 5 A g(-1)). Moreover, impressive cycling stability (509 mA h g(-1) at 1 A g(-1) after 250 cycles) and rate capability (423 mA h g(-1) at 2 A g(-1)) were also achieved for SIBs. The area capacities reached 1.27 and 0.49 mA h cm(-2) at approximate to 1 mA cm(-2) for LIBs and SIBs, respectively. This work may inspire the development of new 2D hierarchical structures for high efficiency energy storage and conversion.