Converting CO₂ into enhanced Li-storage materials is significant for meeting the challenges of both ever-increasing greenhouse gas and unsatisfactory energy-density of Li-ion battery. Here, a novel silicothermic reaction is developed for reduction of CO₂ with Ni-activated Si into graphitic carbon (GC) in autoclave, producing well-dispersed GC-Si composites (SGC). To realize the reaction, Ni crystals are pre-anchored on Si surface, which is demonstrated for not only lowering the reaction temperature by enhancing the absorption of CO₂, and suppressing the formation of inert SiC, but also facilitating the graphitization of generated carbon. Analysis of the kinetic process and cycling stability confirm the SGC electrode exhibits better Li-ion storage performance than Si electrode in term of electron/ion diffusion, the mechanical integrity and chemically stability of the solid electrolyte interphase, retaining a capacity of 845.3 ​mA ​h ​g⁻¹ after 380 cycles at 2.0 ​A ​g⁻¹. The full cell consisted of a SGC-graphite-blend anode and LiCoO₂ cathode is also assembled and investigated.

将CO ₂转化为增强的锂存储材料对于应对不断增加的温室气体和锂离子电池能量密度不令人满意的挑战具有重要意义。在这里，开发了一种新型的硅热反应，用于将Ni活化的Si将CO ₂还原为高压釜中的石墨碳（GC），从而生产出分散良好的GC-Si复合材料（SGC）。为了实现该反应，将Ni晶体预先锚定在Si表面上，这证明其不仅通过提高CO ₂的吸收来降低反应温度。，抑制了惰性SiC的形成，但也促进了生成碳的石墨化。动力学过程和循环稳定性分析证实，SGC电极在电子/离子扩散，固体电解质中间相的机械完整性和化学稳定性方面表现出比Si电极更好的锂离子存储性能，保持了845.3 mA的容量ħ克^-1在2.0 A克380次循环后^-1。完整的电池由SGC-石墨混合阳极和LiCoO ₂阴极组成，并进行了研究。