CAJ | 학술논문

研究LiNi0.5Mn0.5O2电极在LiNO3水溶液中的电化学行为，同时分析该电极在不同pH值电解液中的循环衰减原因。循环伏安测试显示LiNi0.5Mn0.5O2在浓度为5 mol/L的LiNO3水溶液中具有较好的锂离子脱嵌能力。对比发现，LiNi0.5Mn0.5O2电极在浓度为5 mol/L，pH值为12的LiNO3水溶液中具有最好的循环稳定性能。通过交流阻抗法、X射线衍射分析及电极形貌的对比分析发现：电极在浓度为5 mol/L，pH值为12的LiNO3水溶液中循环时，电极的表面形貌和电极结构都能得到较好的保持，电极的电荷传递阻抗得到明显抑制，因此在该pH值电解液中的循环稳定性最好。
연구LiNi0.5Mn0.5O2전겁재LiNO3수용액중적전화학행위，동시분석해전겁재불동pH치전해액중적순배쇠감원인。순배복안측시현시LiNi0.5Mn0.5O2재농도위5 mol/L적LiNO3수용액중구유교호적리리자탈감능력。대비발현，LiNi0.5Mn0.5O2전겁재농도위5 mol/L，pH치위12적LiNO3수용액중구유최호적순배은정성능。통과교류조항법、X사선연사분석급전겁형모적대비분석발현：전겁재농도위5 mol/L，pH치위12적LiNO3수용액중순배시，전겁적표면형모화전겁결구도능득도교호적보지，전겁적전하전체조항득도명현억제，인차재해pH치전해액중적순배은정성최호。
Electrochemical behavior of layered LiNi0.5Mn0.5O2 in LiNO3 aqueous solution and its cyclic fading mechanism in electrolytes with different pH values were investigated. CV results show that LiNi0.5Mn0.5O2 has good electrochemical reversible behaviors in 5 mol/L LiNO3 solution. Meanwhile, the electrode in 5 mol/L LiNO3 with pH value of 12 demonstrates the best electrochemical stability. Based on the electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) results, it is proposed that suppressed charge-transfer resistance is the major reason, which is probably ascribed to the more stable electrode surface and less structure change.