Insight into the capacity degradation and structural evolution of single-crystal Ni-rich cathodes

作     者：Xiaodong Zhang Jiao Lin Ersha Fan Qingrong Huang Su Ma Renjie Chen Feng Wu Li Li 

作者机构：Beijing Key Laboratory of Environmental Science and EngineeringSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Technology Research InstituteBeijing Institute of TechnologyJinan 250300ShandongChina Collaborative Innovation Center of Electric Vehicles in BeijingBeijing 100081China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第95卷第8期

页      面：68-76,I0003页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

主　　题：Single-crystal cathodes Capacity decay Phase transition Differential capacity analysis 

摘      要：Single-crystal Ni-rich cathodes are a promising candidate for high-energy lithium-ion batteries due to their higher structural and cycling stability than polycrystalline ***,the phase evolution and capacity degradation of these single-crystal cathodes during continuous lithation/delithation cycling remains *** the mapping relationship between the macroscopic electrochemical properties and the material physicochemical properties is ***,we investigate the correlation between the physical-chemical characteristics,phase transition,and capacity decay using capacity differential curve feature identification and in-situ X-ray spectroscopic *** systematically clarify the dominant mechanism of phase evolution in aging *** high cut-off voltages can mitigate the slow kinetic and electrochemical properties of single-crystal *** also find that second-order differential capacity discharge characteristic curves can be used to identify the crystal structure disorder of Ni-rich *** findings constitute a step forward in elucidating the correlation between the electrochemical extrinsic properties and the physicochemical intrinsic properties and provide new perspectives for failure analysis of layered electrode materials.