Zn-ion 배터리용 ZnMn2O4 양극재의 입자 크기 증가를 통한 Mn3+ 용출 완화로 수명 증가

• Published in: 대한금속·재료학회지, 61(12) pp. 923 - 932
• Main Authors: 박재영, 최영묵, 전상은
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.12.2023
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2023.61.12.923

ZnMn2O4 (ZMO) cathode possesses a high theoretical capacity of 224 mAh g−1 and high operatingvoltage (1.9 V vs. Zn2+/Zn) for aqueous Zn–ion batteries. However, the disproportionation reaction of Mn3+leads to Mn dissolution in the ZMO cathode, deteriorating lifespan. In this study, we attempted to reduce Mndissolution by enlarging the particle size, thereby diminishing the electrode/electrolyte interfacial area. TheZMO particle grew with increasing the calcination temperatures of 400oC, 500oC, and 600oC. Highercalcination temperature created oxygen vacancies within the lattice, thereby increasing the contents of Mn3+for charge neutrality. The rate capability decreased with the increase in particle size, which is presumed tobe due to the lengthening of the diffusion path of Zn ions. After a long–cycle experiment of Zn–ion batteriesassembled with ZMO cathode and Zn anode, the Mn deposit amount on the anode was measured to revealthe Mn dissolution from the ZMO cathode based on the disproportionation reaction. The ZMO particlesynthesized at 600oC with the largest particle size demonstrated the highest cyclability of 48.1% at 1.0 A g−1based on the lowest Mn deposit on the anode. Hence, the ZMO electrode with a larger particle size exhibitedimproved cycle stability by alleviating of the disproportionation reaction from the reduced electrode/electrolyteinterfacial area. KCI Citation Count: 0