Si@SiOx/Ag composite anodes with high initial coulombic efficiency derive from recyclable silicon cutting waste
Si@SiOx/Ag composite anodes with high initial coulombic efficiency derive from recyclable silicon cutting waste
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具有高初始库仑效率的 Si@SiOx/Ag 复合阳极源自可回收的硅切割废料
DOI：
10.1016/j.cej.2022.137563
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发表时间：
2022
影响因子：
15.1
通讯作者：
Rong Deng
中科院分区：
文献类型：
--
作者：
张嘉昆;李绍元;席风硕;万小涵;丁朝;陈正杰;马文会;Rong Deng
蓬勃发展的光伏产业每年都会产生大量的微米级硅片切割废料，这给环境保护和太阳能电池的发展带来了重大挑战。本文以廉价的硅切割废料为原料，采用直流热等离子体法制备了表面光滑的纳米球形结构Si@ SiOx，并与纳米银复合，得到球形Si@SiOx/Ag纳米复合阳极。在充放电过程中，独特的球形核壳结构缓解了硅中的应力集中，大大提高了其稳定性。银的加入大大提高了复合材料的导电性和锂离子的迁移率。Si@SiOx/Ag纳米复合材料阳极具有89.9%的优异的初始库仑效率，以及在500 mA/g下2919 mAh/g的大的初始放电容量。即使经过200次充放电循环，可逆容量仍超过1000 mAh/g。本研究开发了利用硅切割废料制备高初始库仑效率锂离子电池硅负极材料的可行性。
The booming photovoltaic industry generates large amounts of micron-sized silicon cutting waste every year, which brings a significant challenge to both environmental protection and solar cells development. In this work, low-cost silicon cutting waste was used as raw material for silicon-based anodes Nano-spherical structure Si@SiOxwith a smooth surface were first synthesized via DC thermal plasma, then were composited with nano-silver and obtained the spherical Si@SiOx/Ag nanocomposites anode. During charging and discharging, the unique spherical core–shell structure relieves the stress concentration in silicon and greatly improves its stability. With the addition of Ag, both the electrical conductivity of the composite and the mobility of lithium ions are greatly improved. The Si@SiOx/Ag nanocomposite anode has an outstanding initial coulombic efficiency of 89.9%, as well as a large initial discharge capacity of 2919 mAh/g at 500 mA/g. Even after 200 charge–discharge cycles, the reversible capacity is still over 1000 mAh/g. This study develops the feasibility of making high initial coulombic efficiency silicon anode materials for lithium-ion batteries from silicon cutting waste.