Integration of photovoltaic (PV) power generation and energy storage has been widely believed to be the ultimate solution for future energy demands. Herein, an ingenious method was reported to make full use of photovoltaic silicon cutting waste (SiCW) natural characters fabricating PSi@SiOx/Nano-Ag composite as anode material for high-performance lithium-ion batteries. The sheet-like structure with nano/micropores and native SiOx layer addressed the volume expansion issues of Si material. Ag nanoparticles greatly enhanced electrical conductivity of composite and promoted Li⁺/e⁻ transport. Synergistic effect of the designed PSi@SiOx/Nano-Ag composite contributed outstanding cyclic performance with reversible capacity of 1409 mAh g⁻¹ after 500 cycles. Notably, full LIBs with PSi@SiOx/Nano-Ag anode and commercial Li[Ni_0.6Co_0.2Mn_0.2]O₂ (NCM622) cathode delivered stable capacity of 137.5 mAh g⁻¹ at current density of 200 mA g⁻¹, accompanying with a high energy density of 438 Wh kg⁻¹. Furthermore, electrochemical Li⁺ storage behavior of this PSi@SiOx/Nano-Ag electrode was studied, and reaction mechanism and crystal structure evolution during cycles were also revealed by in-situ XRD analysis. The synthesis method is facile and cost-effective, which paves a novel way towards high-performance Si-based anodes and promising markets for both solar photovoltaic and lithium-ion battery industries.

人们普遍认为，光伏（PV）发电与能量存储的集成是满足未来能源需求的最终解决方案。在本文中，报道了一种巧妙的方法，该方法充分利用了光伏硅切割废料（SiCW）的自然特征，制造PSi @ SiO x /纳米Ag复合材料作为高性能锂离子电池的负极材料。具有纳米/微孔和天然SiO x层的片状结构解决了Si材料的体积膨胀问题。银纳米颗粒大大增强的复合材料的导电性，并促进锂⁺ / E ^-运输。设计的PSi @ SiO x的协同效应/纳米银复合材料在500次循环后具有出色的循环性能，可逆容量为1409 mAh g ^-1。值得注意的是，具有PSi @ SiO x / Nano-Ag阳极和商用Li [Ni _0.6 Co _0.2 Mn _0.2 ] O ₂（NCM622）阴极的完整LIB在200 mA g ^-1的电流密度下可提供137.5 mAh g ^-1的稳定容量，伴随着438 Wh kg ^-1的高能量密度。此外，该PSi @ SiO x的电化学Li ⁺储存行为/ Nano-Ag电极进行了研究，并通过原位XRD分析揭示了反应过程中的反应机理和晶体结构演变。该合成方法简便易行且具有成本效益，为高性能的硅基阳极和太阳能光伏和锂离子电池行业的广阔市场铺平了道路。