Suppress voltage decay of lithium-rich materials by coating layers with different crystalline states

• 作者: Zhiwei Zhou Ziyan Luo Zhenjiang He Junchao Zheng Yunjiao Li Cheng Yan Jing Mao
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 591-598
• 页数: 8页
• 语种: 英文

摘要

Li-rich oxides are considered as the most commercial potential cathode materials due to the high theo-retical specific discharge capacity.Here,ZrO2 in different crystalline states are applied as the coating lay-ers to enhance the electrochemical performance of hollow Li[Li0.2Mn0.54Ni0.13Co0.13]O2 materials.Meanwhile,a series of characterizations(XRD,SEM,TEM,EDX etc.)are conducted to compare the effects of ZrO2 coating layer with different crystalline states on the host material.The results elucidate that the Li-rich Mn-based material with the polycrystal ZrO2 coating layer has a slight advantage in rate perfor-mance,while the host material with the single crystal ZrO2-coating layer has a better cycling perfor-mance and effectively suppresses voltage decay with the effect of excellently inhibiting layered to spinel-like phase transition and metal dissolution during charging and discharging process.