期刊
ADVANCED MATERIALS
卷 33, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202105337
关键词
high-rate charging; Li-ion batteries; nickel-rich cathodes; phase transformation kinetics
类别
资金
- LG Energy Solution and Technology Innovation Program (Industrial Strategic Technology Development Program-Alchemist Project) - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20012390]
- Agency for Defense Development (ADD) [UC190025RD]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2021R1A2C3005096, NRF-2015M3D1A1070639, NRF-2021R1C1C1013953, NRF-2019R1A6A3A13096198, NRF-2018R1A5A1025224]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012390] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [4199990214002] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the impact of high cycling rates on the phase transformation kinetics of LiNi0.6Co0.2Mn0.2O2, providing insights for optimizing battery performance in high-power applications. By utilizing experimental methods and numerical simulations, the research sheds light on the dynamics of phase transformation under different charging and discharging conditions, offering a new direction for fast-cycling protocols based on material properties.
Understanding the cycling rate-dependent kinetics is crucial for managing the performance of batteries in high-power applications. Although high cycling rates may induce reaction heterogeneity and affect battery lifetime and capacity utilization, such phase transformation dynamics are poorly understood and uncontrollable. In this study, synchrotron-based operando X-ray diffraction is performed to monitor the high-current-induced phase transformation kinetics of LiNi0.6Co0.2Mn0.2O2. The sluggish Li diffusion at high Li content induces different phase transformations during charging and discharging, with strong phase separation and homogeneous phase transformation during charging and discharging, respectively. Moreover, by exploiting the dependence of Li diffusivity on the Li content and electrochemically tuning the initial Li content and distribution, phase separation pathway can be redirected to solid solution kinetics at a high charging rate of 7 C. Finite element analysis further elucidates the effect of the Li-content-dependent diffusion kinetics on the phase transformation pathway. The findings suggest a new direction for optimizing fast-cycling protocols based on the intrinsic properties of the materials.
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