Nanocubes of Mo 6 S 8 Chevrel phase as active electrode material for aqueous lithium-ion batteries
Nanocubes of Mo 6 S 8 Chevrel phase as active electrode material for aqueous lithium-ion batteries
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Mo 6 S 8 Chevrel相纳米立方体作为水系锂离子电池活性电极材料
DOI：
10.1039/d2nr02014a
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发表时间：
2022
期刊：
影响因子：
6.7
通讯作者：
Elgendy A
中科院分区：
文献类型：
--
作者：
Elgendy A
本质安全且环境可持续的储能设备的开发是一项重大挑战。水溶液可充电锂离子电池（ARLIB）的最新进展在这方面取得了相当大的进展。与扩展电化学稳定电位窗口的水性电解质的设计的持续进展平行，表现出大容量和低嵌入电位的负电极材料的设计吸引了极大的研究兴趣。本文报道了一种简单、高效、可控的分子前驱体法合成高纯度纳米级Chevrel相（CP）Mo 6S 8，与传统方法相比，该方法能耗显著降低。所得产物的物理表征证实了CP-Mo 6S 8的成功形成，并揭示了其本质上是结晶纳米结构的。由于其独特的结构特征，Mo 6S 8纳米立方体在21 μ m锂双（三氟甲磺酰基）酰亚胺（LiTFSI）电解质中表现出快速动力学，这是由于Li+离子扩散距离较短。由分别作为负极和正极材料的Mo 6S 8和LiMn 2 O 4组成的全电池组电池在2.23 V下工作，在0.2 C-倍率下提供85 W h kg-1的高能量密度（以活性材料的总质量计算）。在4C下，库仑效率（CE）被确定为99%，在某些循环下增加到接近100%。尸检物理表征表明，Mo 6S 8阳极保持其结晶度，从而表现出出色的循环稳定性。该电池的性能优于常用的钒基（VO 2（B）、V2 O 5）或（NASICON）型LiTi 2（PO 4）3阳极，突出了纳米级CP-Mo 6S 8作为高效阳极材料的前景。总之，所提出的合成策略有望刺激新的研究，以广泛应用于各种水性和非水性储能系统中的CP基材料。
The development of intrinsically safe and environmentally sustainable energy storage devices is a significant challenge. Recent advances in aqueous rechargeable lithium-ion batteries (ARLIBs) have made considerable steps in this direction. In parallel to the ongoing progress in the design of aqueous electrolytes that expand the electrochemically stable potential window, the design of negative electrode materials exhibiting large capacity and low intercalation potential attracts great research interest. Herein, we report the synthesis of high purity nanoscale Chevrel Phase (CP) Mo6S8via a simple, efficient and controllable molecular precursor approach with significantly decreased energy consumption compared to the conventional approaches. Physical characterization of the obtained product confirms the successful formation of CP-Mo6S8 and reveals that it is crystalline nanostructured in nature. Due to their unique structural characteristics, the Mo6S8 nanocubes exhibit fast kinetics in a 21 m lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) electrolyte as a result of the shorter Li+ ion diffusion distance. Full battery cells comprised of Mo6S8 and LiMn2O4 as negative and positive electrode materials, respectively, operate at 2.23 V delivering a high energy density of 85 W h kg−1 (calculated on the total mass of active materials) under 0.2 C-rate. At 4 C, the coulombic efficiency (CE) is determined to be 99% increasing to near 100% at certain cycles. Post-mortem physical characterization demonstrates that the Mo6S8 anode maintained its crystallinity, thereby exhibiting outstanding cycling stability. The cell outperforms the commonly used vanadium-based (VO2 (B), V2O5) or (NASICON)-type LiTi2(PO4)3 anodes, highlighting the promising character of the nanoscale CP-Mo6S8 as a highly efficient anode material. In summary, the proposed synthetic strategy is expected to stimulate novel research towards the widespread application of CP-based materials in various aqueous and non-aqueous energy storage systems.