Co‐Construction of Sulfur Vacancies and Heterojunctions in Tungsten Disulfide to Induce Fast Electronic/Ionic Diffusion Kinetics for Sodium‐Ion Batteries,Advanced Materials

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Co‐Construction of Sulfur Vacancies and Heterojunctions in Tungsten Disulfide to Induce Fast Electronic/Ionic Diffusion Kinetics for Sodium‐Ion Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2020-10-21 , DOI: 10.1002/adma.202005802
Yu Li ₁ , Ji Qian ₁ , Minghao Zhang ₁ , Shuo Wang ₂ , Zhaohua Wang ₁ , Maosheng Li ₃ , Ying Bai ₁ , Qinyou An ₃ , Huajie Xu ₄ , Feng Wu _{1,

5} , Liqiang Mai ₃ , Chuan Wu _{1,

5}

Affiliation

Engineering novel electrode materials with unique architectures has a significant impact on tuning the structural/electrochemical properties for boosting the performance of secondary battery systems. Herein, starting from well‐organized WS₂ nanorods, an ingenious design of a one‐step method is proposed to prepare a bimetallic sulfide composite with a coaxial carbon coating layer, simply enabled by ZIF‐8 introduction. Rich sulfur vacancies and WS₂/ZnS heterojunctions can be simultaneously developed, that significantly improve ionic and electronic diffusion kinetics. In addition, a homogeneous carbon protective layer around the surface of the composite guarantees an outstanding structural stability, a reversible capacity of 170.8 mAh g⁻¹ after 5000 cycles at a high rate of 5 A g⁻¹. A great potential in practical application is also exhibited, where a full cell based on the WS₂₋_x/ZnS@C anode and the P2‐Na_2/3Ni_1/3Mn_1/3O₂ cathode can maintain a reversible capacity of 89.4 mAh g⁻¹ after 500 cycles at 1 A g⁻¹. Moreover, the underlying electrochemical Na storage mechanisms are illustrated in detail by theoretical calculations, electrochemical kinetic analysis, and operando X‐ray diffraction characterization.

中文翻译：

共构建二硫化钨中的硫空位和异质结，以诱导钠离子电池的快速电子/离子扩散动力学。

对具有独特结构的新型电极材料进行工程设计，对调整结构/电化学性能以提高二次电池系统的性能具有重大影响。在这里，从组织良好的WS ₂纳米棒开始，提出了一种巧妙的单步方法设计，以制备具有同轴碳涂层的双金属硫化物复合材料，只需引入ZIF-8即可。可以同时开发丰富的硫空位和WS ₂ / ZnS异质结，从而显着提高离子和电子扩散动力学。此外，复合材料表面周围的均匀碳保护层可确保出色的结构稳定性，可逆容量为170.8 mAh g ^-1在5000次循环之后以5A g ^-1的高速率。还展示了在实际应用中的巨大潜力，其中基于WS _2-_x / ZnS @ C阳极和P2-Na _2/3 Ni _1/3 Mn _1/3 O ₂阴极的满电池可以保持可逆容量的89.4毫安克^-1 1 A G 500次循环后^-1。此外，通过理论计算，电化学动力学分析和操作X射线衍射表征详细说明了潜在的电化学Na储存机理。

更新日期：2020-11-25

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