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

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

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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 materials.However,the phase evolution and capacity degradation of these single-crystal cathodes during continuous lithation/delithation cycling remains unclear.Understanding the mapping relationship between the macroscopic electrochemical properties and the material physicochemical properties is crucial.Here,we investigate the correlation between the physical-chemical characteristics,phase transition,and capacity decay using capacity differ-ential curve feature identification and in-situ X-ray spectroscopic imaging.We systematically clarify the dominant mechanism of phase evolution in aging cycling.Appropriately high cut-off voltages can miti-gate the slow kinetic and electrochemical properties of single-crystal cathodes.We also find that second-order differential capacity discharge characteristic curves can be used to identify the crystal structure disorder of Ni-rich cathodes.These findings constitute a step forward in elucidating the corre-lation between the electrochemical extrinsic properties and the physicochemical intrinsic properties and provide new perspectives for failure analysis of layered electrode materials.

Single-crystal cathodesCapacity decayPhase transitionDifferential capacity analysis

Xiaodong Zhang、Jiao Lin、Ersha Fan、Qingrong Huang、Su Ma、Renjie Chen、Feng Wu、Li Li

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Beijing Key Laboratory of Environmental Science and Engineering,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,100081,China

Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing,100081,China

Beijing Key Laboratory of Environmental Science and Engineering,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

Advanced Technology Research Institute,Beijing Institute of Technology,Jinan 250300,Shandong,China

Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing 100081,China

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2024

10.1016/j.jechem.2024.03.039

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)