Mechanism of Exact Transition between Cationic and Anionic Redox Activities in Cathode Material Li2FeSiO4

Zheng, Jiaxin; Teng, Gaofeng; Yang, Jinlong; Xu, Ming; Yao, Qiushi; Zhuo, Zengqing; Yang, Wanli; Liu, Qihang; Pan, Feng

doi:10.1021/acs.jpclett.8b02725

Mechanism of Exact Transition between Cationic and Anionic Redox Activities in Cathode Material Li₂FeSiO₄

Journal Article · Tue Oct 16 00:00:00 EDT 2018 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.8b02725· OSTI ID:1594900

Zheng, Jiaxin ^[1]; Teng, Gaofeng ^[1]; Yang, Jinlong ^[1]; Xu, Ming ^[1]; Yao, Qiushi ^[2]; Zhuo, Zengqing ^[3]; ^[4]; ^[5]; ^[1]

Peking Univ., Shenzhen (China)
Southern Univ. of Science and Technology, Shenzhen (China)
Peking Univ., Shenzhen (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Southern Univ. of Science and Technology, Shenzhen (China); Univ. of Colorado, Boulder, CO (United States)

The discovery of anion redox activity is promising for boosting the capacity of lithium ion battery (LIB) cathodes. However, fundamental understanding of the mechanisms that trigger the anionic redox is still lacking. In this study, using hybrid density functional study combined with experimental soft X-ray absorption spectroscopy (sXAS) measurements, we unambiguously proved that Li_(2-x)FeSiO₄ performs sequent cationic and anionic redox activity through delithiation. Specifically, Fe²⁺ is oxidized to Fe³⁺ during the first Li ion extraction per formula unit (f.u.), while the second Li ion extraction triggered the oxygen redox exclusively. Cationic and anionic redox result in electron and hole polaron states, respectively, explaining the poor conductivity of Li_(2-x)FeSiO₄ noted by previous experiments. In contrast, other cathode materials in this family exhibit diversity of the redox process. Li₂MnSiO₄ shows double cationic redox (Mn²⁺-Mn⁴⁺) during the whole delithiation, while Li₂CoSiO₄ shows simultaneous cationic and anionic redox. The present finding not only provides new insights into the oxygen redox activity in polyanionic compounds for rechargeable batteries but also sheds light on the future design of high-capacity rechargeable batteries.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1594900

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 21 Vol. 9; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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