Oh Minsub, Kim Ilwhan, Lee Hoo-Jeong, Hyun Seungmin, Kang Chiwon
School of Advanced Materials Science and Engineering, Sungkyunkwan University Suwon Republic of Korea
Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials (KIMM) Daejeon Republic of Korea
RSC Adv. 2018 Mar 1;8(17):9168-9174. doi: 10.1039/c7ra13172k. eCollection 2018 Feb 28.
Here, we studied the effect of thermal annealing on the microstructure and cyclic stability of a (Ti, Fe)-alloyed Si thin-film fabricated by a simple sputtering deposition method for Li-ion battery (LIB) anodes. The anode samples annealed at different temperatures (300-600 °C) were subjected to microstructure analysis and LIB performance test. The (Ti, Fe)-alloyed Si thin-film anode delivered a high capacity of 1563 mA h g for 100 cycles at 0.1 A g with nearly 100% capacity retention. Post-mortem analysis using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) disclosed the microstructural changes of the cycled anodes, revealing that (Ti, Fe) silicides served as a structural buffer against the large volume change of active Si during cycling for enhanced LIB performance.
在此，我们研究了热退火对通过简单溅射沉积法制备的用于锂离子电池（LIB）阳极的（钛，铁）合金化硅薄膜的微观结构和循环稳定性的影响。对在不同温度（300 - 600°C）下退火的阳极样品进行了微观结构分析和LIB性能测试。（钛，铁）合金化硅薄膜阳极在0.1 A g的电流密度下循环100次时，展现出1563 mA h g的高容量，且容量保持率接近100%。使用场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）进行的失效分析揭示了循环后阳极的微观结构变化，表明（钛，铁）硅化物作为一种结构缓冲层，可抵抗循环过程中活性硅的大体积变化，从而提升LIB性能。
