Boosting energy efficiency of Li-rich layered oxide cathodes by tuning oxygen redox kinetics and reversibility

Yin, Chong; Wan, Liyang; Qiu, Bao; Wang, Feng; Jiang, Wei; Cui, Hongfu; Bai, Jianming; Ehrlich, Steven; Wei, Zhining; Liu, Zhaoping

doi:10.1016/j.ensm.2020.11.034

Boosting energy efficiency of Li-rich layered oxide cathodes by tuning oxygen redox kinetics and reversibility

Journal Article · Mon Nov 23 00:00:00 EST 2020 · Energy Storage Materials

DOI:https://doi.org/10.1016/j.ensm.2020.11.034· OSTI ID:1776532

Yin, Chong ^[1]; Wan, Liyang ^[2]; Qiu, Bao ^[3]; Wang, Feng ^[4]; Jiang, Wei ^[3]; Cui, Hongfu ^[3]; Bai, Jianming ^[5]; Ehrlich, Steven ^[5]; Wei, Zhining ^[3]; Liu, Zhaoping ^[3]

Chinese Academy of Sciences (CAS), Zhejiang (China). Ningbo Inst. of Materials Technology & Engineering, Advanced Li-ion Battery Engineering Laboratory of Zhejiang Province and Key Laboratory of Graphene Technologies & Applications of Zhejiang Province; Univ. of Chinese Academy of Sciences (UCAS), Beijing (China); Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences (CAS), Zhejiang (China). Ningbo Inst. of Materials Technology & Engineering, Advanced Li-ion Battery Engineering Laboratory of Zhejiang Province and Key Laboratory of Graphene Technologies & Applications of Zhejiang Province; Univ. of Chinese Academy of Sciences (UCAS), Beijing (China)
Chinese Academy of Sciences (CAS), Zhejiang (China). Ningbo Inst. of Materials Technology & Engineering, Advanced Li-ion Battery Engineering Laboratory of Zhejiang Province and Key Laboratory of Graphene Technologies & Applications of Zhejiang Province
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

In developing electrode materials for next-generation Li-ion batteries, significant efforts have been given to the energy, power density and cycling stability, with much less (if any) attention paid to the energy efficiency – arguably, the most important practical measure for large-scale applications. This is particularly true for the oxygen-redox active electrodes, such as Li_1.2Ni_0.13Co_0.13Mn_0.54O₂, the notorious energy-inefficient cathode that has an extremely high capacity but comes with large voltage hysteresis and voltage decay. Herein, we report the rational design of an energy-efficient Li-rich layered cathode along with high energy, power density and cycling stability enabled by tuning oxygen redox activity. Specifically, the target material Li_1.12Ni_0.22Co_0.13Mn_0.52O₂ exhibits an ultrahigh energy efficiency at 1 C (90.6%), high capacity (> 200 mAh g^-1) with 98.9% retention and less than 150 mV decay at the extended 200 cycles. Overall, through direct comparison between the material and Li_1.2Ni_0.13Co_0.13Mn_0.54O₂, we show that the compositional change, although slightly, greatly improves the oxygen redox kinetics and reversibility, thereby boosts energy efficiency. The findings offer a strategy to narrow the gap between scientific interest and practical application of oxygen-redox chemistry.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Key R&D Program of China; National Natural Science Foundation of China (NNSFC); Natural Science Foundation of Ningbo; S&T Innovation 2025 Major Special Program of Ningbo; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1776532

Alternate ID(s):: OSTI ID: 1809844

Report Number(s):: BNL--221208-2021-JAAM

Journal Information:: Energy Storage Materials, Journal Name: Energy Storage Materials Vol. 35; ISSN 2405-8297

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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