Choi Mansoo, Shim Sung-Joo, Jung Yang-Il, Kim Hyun-Soo, Seo Bum-Kyoung
Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea.
Battery Research Center, Korea Electrotechnology Research Institute, Changwon 51543, Korea.
Nanomaterials (Basel). 2021 Nov 29;11(12):3238. doi: 10.3390/nano11123238.
Anode materials providing a high specific capacity with a high cycling performance are one of the key parameters for lithium ion batteries' (LIBs) applications. Herein, a high-capacity NiFeO(NFO) film anode is prepared by E-beam evaporation, and the effect of the heat treatment is studied on the microstructure and electrochemical properties of LIBs. The NiFeO film annealed at 800 °C (NFO-800) showed a highly crystallized structure and different surface morphologies when compared to the electrode annealed at a lower temperature (NFO-600, NFO-700). In the electrochemical measurements, the high specific capacity (1804 mA g) and capacity retention ratio (95%) after 100 cycles were also achieved by the NFO-800 electrode. The main reason for the good electrochemical performance of the NFO-800 electrode is a high structure integrity, which could improve the cycle stability with a high discharge capacity. The NiFeO electrode with an annealing process could be further proposed as an alternative ferrite material.
具备高比容量和高循环性能的负极材料是锂离子电池（LIBs）应用的关键参数之一。在此，通过电子束蒸发制备了一种高容量的NiFeO（NFO）薄膜负极，并研究了热处理对LIBs微观结构和电化学性能的影响。与在较低温度下退火的电极（NFO - 600、NFO - 700）相比，在800℃退火的NiFeO薄膜（NFO - 800）呈现出高度结晶的结构和不同的表面形貌。在电化学测量中，NFO - 800电极还实现了高比容量（1804 mA g）和100次循环后的容量保持率（95%）。NFO - 800电极具有良好电化学性能的主要原因是其高结构完整性，这可以提高具有高放电容量的循环稳定性。经过退火处理的NiFeO电极可进一步作为替代铁氧体材料被提出。
