材料科学
石墨烯
重量分析
阳极
电极
氧化物
插层(化学)
电化学
储能
电池(电)
化学工程
纳米技术
钾
无机化学
冶金
量子力学
物理
工程类
物理化学
功率(物理)
有机化学
化学
作者
Kai Yao,Zhanwei Xu,Meng Ma,Jiayin Li,Fanyu Lu,Jianfeng Huang
标识
DOI:10.1002/adfm.202001484
摘要
Abstract The potassium‐ion battery (PIB) is an attractive energy storage device that possesses the potential advantages of high energy density and low cost. Herein, a pure 1T‐MoS 2 is synthesized on graphene oxide and assembled into a hydrogel. The hydrogel is further tightened to a compact 1T‐MoS 2 /graphene (CTMG) bulk by a densifying strategy of capillary tension. When employed as an anode for PIBs, the CTMG electrode can store K + through reversible intercalation and conversion electrochemistry, accompanied with fast kinetics since the 1T‐MoS 2 induces a pseudocapacitive storage mechanism and the extraordinary K + transportation ability. Consequently, the CTMG electrode delivers the high and reversible rate capacities of 511 and 327 mAh g ‐1 at 0.1 and 1 A g ‐1 , respectively. Moreover, the compact architecture reduces the electrode thickness by ≈33% enabling a high volumetric capacity (512 mAh cm ‐3 at 0.1 A g ‐1 after 100 cycles), as well as holding a promising application in thick electrode.
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