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An advanced high-rate capability sodium-ion anode: Few-layered NbSe2 with a mechanism of parallel running intercalation and conversion
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-03-29 , DOI: 10.1016/j.jcis.2024.03.196
Han Xu 1 , Qing Zhang 2 , Shuai Nan 3 , Xinyu Wang 4 , Jiangli Luo 4 , Longhui Li 4 , Huaiqiang Gu 5 , Lei Tan 6 , Xin Du 4 , Luxiang Wang 2 , Wei Xia 7 , Dan Li 1
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-03-29 , DOI: 10.1016/j.jcis.2024.03.196
Han Xu 1 , Qing Zhang 2 , Shuai Nan 3 , Xinyu Wang 4 , Jiangli Luo 4 , Longhui Li 4 , Huaiqiang Gu 5 , Lei Tan 6 , Xin Du 4 , Luxiang Wang 2 , Wei Xia 7 , Dan Li 1
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The unique superconductivity and charge density wave transition characteristics of NbSe2 make it worthy of exploring its electrochemical performance and potential applications in the field of batteries. Herein, the bulk NbSe2 was successfully exfoliated into few-layered NbSe2 nanostructures by wet grinding exfoliation approach, which solved the issues of its long activation period and poor cycle stability. The strong Nb-Se bond in the plane and weak van der Waals force between the adjacent layers could render the fast Na+ diffusion, provide abundant reaction sites and multi-directional migration paths, thus accelerate the ionic conductivity. The theoretical calculations verified the high Na+ adsorption tendency between the NbSe2 interlayers stemming from the continuous region of charge accumulation. Thanks to the unique electronic and two-dimensional few-layered structures, the exfoliated NbSe2 exhibited a high cyclic stability with a capacity of 502 mA h g−1 over 2800 cycles at 10 A/g. In addition, the reaction mechanism was studied by in -situ X-ray diffraction and other tests, indicating a reaction mechanism containing of simultaneous intercalation ( N b S e 2 ↔ N a x N b S e 2 ↔ N a N b S e 2 ↔ N a 1 + x N b S e 2 2 . This parallelly running mechanism not only alleviates the volume change but also ensures a high specific capacity. Additionally, different lattice planes of the NaNbSe2 intermediate in the intercalation process experience varying degrees of contraction and expanding in d -spacing due to the influence of Coulombic force.
中文翻译：
先进的高倍率钠离子负极：具有并联插层和转换机制的少层 NbSe2
NbSe2 独特的超导性和电荷密度波跃迁特性使其值得探索其电化学性能和在电池领域的潜在应用。本文通过湿法研磨剥离方法成功地将块体 NbSe2 剥离成少层 NbSe2 纳米结构，解决了其活化期长和循环稳定性差的问题。平面上的强 Nb-Se 键和相邻层之间的弱范德华力可以使 Na+ 快速扩散，提供丰富的反应位点和多向迁移路径，从而加速离子电导。理论计算验证了 NbSe2 夹层之间源于电荷积累连续区域的高 Na+ 吸附趋势。由于独特的电子和二维少层结构，剥离的 NbSe2 表现出高循环稳定性，在 10 A/g 下经过 2800 次循环，容量为 502 mA h g-1。此外，通过原位 X 射线衍射和其他测试研究了反应机理，表明 NbSe2 中含有同时插层 （NbSe2↔NaxNbSe2 NaNbSe2↔NaNbSe2↔Na1+xNbSe2） 和转化过程的反应机理。这种并联运行机构不仅减轻了体积变化，而且确保了高比容量。此外，由于库仑力的影响，NaNbSe2 中间体在插层过程中的不同晶格面经历了不同程度的收缩和 d 间距膨胀。
更新日期：2024-03-29
中文翻译：
先进的高倍率钠离子负极：具有并联插层和转换机制的少层 NbSe2
NbSe2 独特的超导性和电荷密度波跃迁特性使其值得探索其电化学性能和在电池领域的潜在应用。本文通过湿法研磨剥离方法成功地将块体 NbSe2 剥离成少层 NbSe2 纳米结构，解决了其活化期长和循环稳定性差的问题。平面上的强 Nb-Se 键和相邻层之间的弱范德华力可以使 Na+ 快速扩散，提供丰富的反应位点和多向迁移路径，从而加速离子电导。理论计算验证了 NbSe2 夹层之间源于电荷积累连续区域的高 Na+ 吸附趋势。由于独特的电子和二维少层结构，剥离的 NbSe2 表现出高循环稳定性，在 10 A/g 下经过 2800 次循环，容量为 502 mA h g-1。此外，通过原位 X 射线衍射和其他测试研究了反应机理，表明 NbSe2 中含有同时插层 （NbSe2↔NaxNbSe2 NaNbSe2↔NaNbSe2↔Na1+xNbSe2） 和转化过程的反应机理。这种并联运行机构不仅减轻了体积变化，而且确保了高比容量。此外，由于库仑力的影响，NaNbSe2 中间体在插层过程中的不同晶格面经历了不同程度的收缩和 d 间距膨胀。
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