Conformal Prelithiation Nanoshell on LiCoO2 Enabling High-Energy Lithium-Ion Batteries

Conformal Prelithiation Nanoshell on LiCoO2 Enabling High-Energy Lithium-Ion Batteries
Title:
Conformal Prelithiation Nanoshell on LiCoO2 Enabling High-Energy Lithium-Ion Batteries
Other Titles:
Nano Letters
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Publication Date:
06 May 2020
Citation:
Nano Lett. 2020, 20, 4558-4565
Abstract:
The initial lithium loss in lithium-ion batteries (LIBs) reduces their energy density (e.g., 15% or higher for LIBs using a Si-based anode). Herein, we report in situ chemical formation of a conformal Li2O/Co nanoshell (∼20 nm) on LiCoO2 particles as a high-capacity built-in prelithiation reagent to compensate this initial lithium loss. We show a 15 mAh g–1 increase in overall charge capacity for the LiCoO2 with 1.5 wt % Li2O/Co in comparison to the pristine LiCoO2 in virtue of the irreversible lithium extraction from the nanoshell (4Li2O + 3Co → 8Li+ + 8e– + Co3O4, 2Li2O → 4Li+ + 4e– + O2↑). Paired with a graphite–SiO anode, a full cell using such a LiCoO2 cathode demonstrates 11% higher discharge capacity (2.60 mAh cm–2) than that using pristine LiCoO2 (2.34 mAh cm–2) at 0.1 C, as well as stable battery cycling. Moreover, the prelithiated LiCoO2 is compatible with the current battery fabrication process.
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PublisherCopyrights
Funding Info:
This work is financially supported by the Natural Science Foundation of China (Grant No. 51802105) and China Postdoctoral Science Foundation (Grant No. 2018M642833). The authors would also like to thank the Analytical and Testing Center of Huazhong University of Science and Technology (HUST) as well as the Center for Nanoscale Characterization & Devices of Wuhan National Laboratory for Optoelectronics (WNLO) for providing the facilities to conduct the characterizations. Z.W.S acknowledges the support of the Singapore National Research Foundation (NRF-NRFF2017-04).
Description:
This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Nano Letters, copyright © American Chemical Society after peer review. To access the final edited and published work, see https://doi.org/10.1021/acs.nanolett.0c01413
ISSN:
1530-6992
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