Building stable SEI film is highly desirable for high-performance Si-based anode materials used in high energy-density lithium ion batteries (LIBs), which is strongly related with the generated-heat distribution in the electrode. Herein, Si/graphene@carbon embedding with TiN nanoparticles (Si/G@C/TiN) are prepared via a facile ultrasonic spraying method. The Si/G@C/TiN delivers a reversible discharge capacity of 660 ​mAh▪g⁻¹ ​at 10 A▪g⁻¹ and 776.5 ​mAh▪g⁻¹ ​at 5 A▪g⁻¹ after 400 cycles. High electronical conductivity of TiN embedding in the porous carbon framework can not only facilitate electrons transfer in the electrode, but also improve Li-ion kenetic diffusion. High thermal conductivity of TiN would be helpful to faster heat-dissipation and uniform heat-distribution in the electrode during the charging/discharging process, resulting in balanced growth of stable SEI film and excellent cycling stability especially at elevated temperature. Moreover, Si/G@C/TiN pouch cells using LiNi0.5Co0.2Mn0.3O2 as cathode, deliver impressive energy density of ~476 ​Wh▪kg^-1 based on the total weight of active materials, suggesting its promising application in the high energy-density LIBs.

对于在高能量密度锂离子电池（LIB）中使用的高性能Si基负极材料，构建稳定的SEI膜是非常理想的，这与电极中产生的热量分布密切相关。本文中，通过简便的超声喷涂方法制备了嵌入有TiN纳米颗粒的Si /石墨烯@碳（Si / G @ C / TiN）。所述Si / G @ C /氮化钛提供660mAh▪g的可逆放电容量^-1在10A▪g ^-1和776.5mAh▪g ^-1在5A▪g ^-1经过400个周期。TiN嵌入多孔碳骨架中的高电导率不仅可以促进电子在电极中的转移，而且可以改善锂离子的动力学扩散。TiN的高导热率将有助于在充电/放电过程中更快地散热并在电极中均匀分布热量，从而导致稳定SEI膜的平衡生长和出色的循环稳定性，尤其是在高温下。此外，以LiNi0.5Co0.2Mn0.3O2为阴极的Si / G @ C / TiN袋式电池可提供约476 Wh·kg ^-1的能量密度（基于活性物质的总重量），这表明其在电池中的应用前景广阔高能量密度的LIB。