Unique Reversible Conversion-Type Mechanism Enhanced Cathode Performance in Amorphous Molybdenum Polysulfide,ACS Applied Materials & Interfaces

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Unique Reversible Conversion-Type Mechanism Enhanced Cathode Performance in Amorphous Molybdenum Polysulfide
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-10-24 00:00:00 , DOI: 10.1021/acsami.7b12709
Xusheng Wang ₁ , Kuangzhou Du ₁ , Chao Wang ₁ , Luxiang Ma ₁ , Binglu Zhao ₁ , Junfeng Yang ₁ , Meixian Li ₁ , Xin-Xiang Zhang ₁ , Mianqi Xue ₂ , Jitao Chen ₁

Affiliation

A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS_5.7) 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-MoS_5.7 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.

中文翻译：

独特的可逆转化型机理增强了非晶多硫化钼中阴极的性能

据报道，无定形多硫化钼（a-MoS _5.7）阴极材料具有独特的可逆转化型机理。已经检测到金属Mo和Li ₂ S ₂的锂化产物，而不是Mo和Li ₂ S物种。此过程可能会产生746 mAh g ^–1的高放电容量。与常规转化型机理的一般不可逆性相比，在脱锂过程之后回收的多硫化钼的表征显示出独特转化反应的高可逆性。结果，a-MoS _5.7电极提供了高循环稳定性，能量密度保持率为1166 Wh kg ^–1100个周期后。这些结果为高容量和长寿命电极材料的设计提供了一个新颖的模型。

更新日期：2017-10-24

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