Silicon Nanospheres Supported on Conductive MXene Nanosheets as Anodes for Lithium-Ion Batteries
Silicon Nanospheres Supported on Conductive MXene Nanosheets as Anodes for Lithium-Ion Batteries
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DOI：
10.1021/acsaem.2c02706
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发表时间：
2022-12
影响因子：
6.4
通讯作者：
Hui-jie Zhou;Junying Zhang;Jingzhuang Liu;Shuai Feng;Chuanbo Li;E. Marsili;Xiaoming Zhang
中科院分区：
文献类型：
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作者：
Hui-jie Zhou;Junying Zhang;Jingzhuang Liu;Shuai Feng;Chuanbo Li;E. Marsili;Xiaoming Zhang
硅（Si）阳极由于其高容量，有望在未来用于锂离子电池（LIBs）。然而，主要的挑战是将硅与导电材料组装在一起，以增加硅阳极的导电性和稳定性。在这项工作中，我们优化了一种制备锂离子电池负极材料的方法，通过静电组装带正电荷的硅纳米球，涂覆聚二烯丙基二甲基氯化铵，带负电荷的MXene纳米片，增加了强Si NP附着的活性位点的数量，减少了MXene纳米片的重新堆积和Si NP聚集。在0.5 a g-1下，经过300次充放电循环后，Si NP/MXene阳极的容量为1917.9 mA h - 1。Si NP/MXene纳米复合材料的电化学表征表明其具有较高的储能性能、循环稳定性和速率性能。优化Si/MXene复合材料可以提高其作为高能量密度锂离子电池负极材料的性能。
Silicon (Si) anodes are expected to be employed in future for lithium-ion batteries (LIBs), due to their high capacity. However, the main challenge is to assemble Si with conductive materials to increase the conductivity and stability of Si anodes. In this work, we optimized a method to prepare Si nanoparticles (NP)/MXene anode materials for LIBs via electrostatic assembly of positively charged Si nanospheres, coated with poly-diallyl dimethyl ammonium chloride, and negatively charged MXene nanosheets, which increase the number of active sites for strong Si NP attachment and minimize both restacking of MXene nanosheets and Si NP aggregation. The Si NP/MXene anodes have a capacity of 1917.9 mA h g–1after 300 charge/discharge cycles at 0.5 A g–1. The electrochemical characterization of Si NP/MXene nanocomposite shows high energy storage, cycle stability, and rate performance. Optimization of Si/MXene composites can improve their performance as anode materials for high energy density LIBs.