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Dramatic improvement enabled by incorporating thermal conductive TiN into Si-based anodes for lithium ion batteries
Energy Storage Materials ( IF 18.9 ) Pub Date : 2019-12-18 , DOI: 10.1016/j.ensm.2019.12.025
Jianming Tao , Lin Lu , Baoqi Wu , Xinyue Fan , Yanming Yang , Jiaxin Li , Yingbin Lin , Yang Yang Li , Zhigao Huang , Jian Lu

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.



中文翻译:

通过将导热TiN掺入锂离子电池的硅基阳极中,可实现显着改善

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。

更新日期:2019-12-18
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