Crack Active Reports 7
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This work describes the demonstration of self-healing properties in a Ni-rich NCM cathode. The Ni-rich NCM cathode shows a cyclic degradation rate of 50 mV/h for 500 charge-discharge cycles, with a higher degradation rate of 60 mV/h on the first cycle. The self-healing process is initiated by a softening-induced crack propagation and followed by the healing process of the microstructural damage. The Ni-rich NCM cathode shows an average softening-induced crack propagation rate of 14 m/s, which increases to 29 m/s after the self-healing process. After 1000 charge-discharge cycles the initial and delayed crack growth rates for the self-healing of the NCM cathode is 30 m/s and 2 m/s, respectively. The self-healing process is accelerated to 10 m/s by increasing the number of discharging cycles. This work demonstrates that the Ni-rich NCM cathode can be engineered to self-heal with a heal efficiency reaching 70%. The initial heal efficiency of the NCM cathode with 2% microcapsule content is approximately 3 times higher than that of the neat NCM cathode, and self-healing of the NCM cathode is accelerated by increasing the number of discharging cycles. In this work, the Ni-rich NCM cathode with 2% microcapsule content shows a superior self-healing performance, with a higher heal efficiency and lower initial crack growth rate compared to those of the other Ni-rich NCM cathodes with various microcapsule contents. This is the first work to demonstrate self-healing in a NCM cathode and show that the self-healing process is accelerated by increasing the number of discharging cycles. The present study also demonstrates the importance of the microcapsules in enhancing the self-healing of the NCM cathode. The self-healing NCM cathode displays superior electrochemical performance: high initial specific capacity of 1395 mAh/g for the Ni-rich NCM cathode with 2% microcapsule content versus the Ni-rich NCM cathode without microcapsules, and superior cycling stability over the long-term. The present study shows that the Ni-rich NCM cathode can be engineered to self-heal with a heal efficiency reaching 70% and a superior cycling performance.
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