Structural regulation enabled stable hollow molybdenum diselenide nanosheet anode for ultrahigh energy density sodium ion pouch cell,Journal of Colloid and Interface Science

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Structural regulation enabled stable hollow molybdenum diselenide nanosheet anode for ultrahigh energy density sodium ion pouch cell
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2023-11-19 , DOI: 10.1016/j.jcis.2023.11.105
Kang Xu ₁ , Juan Xie ₁ , Huilong Dong ₁ , Chencheng Sun ₁ , Yue Li ₁ , Jia Guo ₁ , Zhefei Wang ₁ , Jun Yang ₂ , Hongbo Geng ₁

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For the continued use of sodium-ion batteries (SIBs), which require matching anode materials, it is crucial to create high energy density energy storage devices. Here, hollow nanoboxes shaped carbon supported sulfur-doped MoSe2 nanosheets (S-MoSe2@NC) are fabricated by in situ growth and heterodoping strategy. This ensures that the MoSe2 nanosheets are tightly anchored to the nanoboxes carbon, and the structure can effectively buffer the volume stress caused by sodium ion (de)intercalation, as well as providing abundant ion/electron migration transportations. As anode for SIBs, the S-MoSe2@NC shows a higher rate capability and excellent cycling stability (431.1 mAh/g after 1100 cycles at 10 A/g). This excellent cycle life and high rate ability are due to the structural stability and outstanding electronic conductance with reduced band gap of the S-MoSe2@NC, as evidenced by the diffusion analysis and theoretical calculation. In order to promote the application of SIBs, the S-MoSe2@NC and NaNi1/3Fe1/3Mn1/3O2 were assembled into a pouch cell, and the test found that besides the excellent cycle rate performance, the ultrahigh energy density of 256 Wh kg−1 and flexible characteristics can be achieved. This study has proven that building a structure with a rock-steady foundation and quick ion migration may efficiently control sodium storage and pave the way for novel applications of high-performance transition metal dichalcogenides in sodium storage.

中文翻译：

结构调控实现稳定的空心二硒化钼纳米片负极，用于超高能量密度钠离子软包电池

为了继续使用需要匹配负极材料的钠离子电池（SIB），创建高能量密度的储能器件至关重要。在这里，通过原位生长和异掺杂策略制备了空心纳米盒形碳负载的硫掺杂 MoSe2 纳米片（S-MoSe2@NC）。这确保了 MoSe2 纳米片与纳米盒碳紧密结合，其结构可以有效缓冲钠离子（脱）嵌引起的体积应力，并提供丰富的离子/电子迁移传输。作为 SIB 的阳极，S-MoSe2@NC 表现出更高的倍率能力和出色的循环稳定性（在 10 A/g 下循环 1100 次后为 431.1 mAh/g）。扩散分析和理论计算证明，这种出色的循环寿命和高倍率能力是由于 S-MoSe2@NC 的结构稳定性和出色的电子电导以及更小的带隙。为了促进 SIBs 的应用，将 S-MoSe2@NC 和 NaNi1/3Fe1/3Mn1/3O2 组装成一个软包电池，测试发现，除了优异的循环速率性能外，还可以实现 256 Wh kg-1 的超高能量密度和柔性特性。本研究证明，构建具有坚如磐石的基础和快速离子迁移的结构可以有效地控制钠的储存，并为高性能过渡金属二硫化物在钠储存中的新应用铺平道路。

更新日期：2023-11-19

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