Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, PR China.
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38606-38611. doi: 10.1021/acsami.7b12709. Epub 2017 Oct 24.
A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS) cathode material. The lithiation products of metallic Mo and LiS rather than Mo and LiS species have been detected. This process could yield a high discharge capacity of 746 mAh g. 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-MoS electrodes deliver high cycling stability with an energy-density retention of 1166 Wh kg after 100 cycles. These results provide a novel model for the design of high-capacity and long-life electrode materials.
一种独特的可逆转换型机制在非晶态钼多硫化物(a-MoS)阴极材料中被报道。已经检测到金属 Mo 和 LiS 的锂化产物，而不是 Mo 和 LiS 物种。这一过程可产生 746mAhg 的高放电容量。对脱锂过程后回收的钼多硫化物的特性表明，这种独特的转换反应具有很高的可逆性，与传统转换型机制的普遍不可逆性形成对比。因此，a-MoS 电极在 100 次循环后具有 1166Whkg 的能量密度保持率，表现出高循环稳定性。这些结果为设计高容量和长寿命电极材料提供了一个新的模型。
