Commercialization of SiO/graphite (SiO/G) composite anode material has been partially conducted in modern-model Li-ion batteries but is still limited by its relatively high cost and inferior stability. Improving the Li-ion storage performance as well as lowering the manufacturing cost of SiO/G anode has been the ongoing target of many studies. Herein, a low cost SiO/G anode with good Li-ion storage performance is developed by facilely integrating SiO nanoparticles into spent graphite (SG) extracted from used LiFePO₄ batteries. The loose SG particles after repeated charge/discharge cycles can be easily exfoliated and combined with the SiO nanoparticles during the mechanical ball-milling treatment. Further processing the composite into spherical structure by spray-drying and pyrolysis results in practically applicable anode materials. The SiO/SG/C anode with a SiO mass ratio of 30 % exhibits the best overall performance including an excellent rate capability (385 mAh g⁻¹ at 3 A g⁻¹) and encouraging cycle stability (442 mAh g⁻¹ after 300 cycles at 1 A g⁻¹). The coin-type full cells coupling the pre-lithiated spherical SiO/SG anode and NCM811 cathode delivers a high energy density of 461 Wh kg⁻¹ (based on the active masses of both electrodes) and good cycle performance (74.4 % capacity retention at 0.5C after 100 cycles). This work not only provides a high performance yet low cost SiO/G anode material, but explores a high value added way for the reuse of SG, thus can practically push forward the development of LIBs.

SiO/石墨（SiO/G）复合负极材料的商业化已在现代锂离子电池中部分实现，但仍因其相对较高的成本和较差的稳定性而受到限制。提高锂离子存储性能以及降低SiO/G负极的制造成本一直是许多研究的持续目标。_{本文中，通过将 SiO 纳米颗粒轻松集成到从废 LiFePO 4}中提取的废石墨（SG）中，开发了一种具有良好锂离子存储性能的低成本 SiO/G 负极。电池。重复充电/放电循环后松散的SG颗粒可以在机械球磨处理过程中轻松剥离并与SiO纳米颗粒结合。通过喷雾干燥和热解将复合材料进一步加工成球形结构，得到实用的负极材料。SiO质量比为30%的SiO/SG/C负极表现出最好的综合性能，包括优异的倍率性能（3 A g ^{-1时为385 mAh g -1} ）和良好的循环稳定性（ 300次后为442 mAh g ^{-1 ） 。 1 A g -1}下的循环）。硬币型全电池耦合预锂化球形 SiO/SG 阳极和 NCM811 阴极，可提供 461 Wh kg ^{-1的高能量密度}（基于两个电极的活性质量）和良好的循环性能（100 次循环后 0.5C 下的容量保持率为 74.4%）。该工作不仅提供了一种高性能、低成本的SiO/G负极材料，而且为SG的再利用探索了一条高附加值的途径，从而切实推动了锂离子电池的发展。