Integrated rocksalt-polyanion cathodes with excess lithium and stabilized cycling
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Nat_Energy_manuscript_-_Yimeng_Huang.pdf
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Author(s)
Huang, Yimeng
Dong, Yanhao
Yang, Yang
Liu, Tongchao
Yoon, Moonsu
Li, Sipei
Wang, Baoming
Zheng, Ethan Yupeng
Lee, Jinhyuk
Sun, Yongwen
Date Issued
August 23, 2024
Journal
Nature Energy
Publisher
Springer Nature
Citation
Huang, Y., Dong, Y., Yang, Y. et al. Integrated rocksalt–polyanion cathodes with excess lithium and stabilized cycling. Nat Energy (2024).
Version
Author's final manuscript
Abstract
Co- and Ni-free disordered rocksalt cathodes utilize oxygen redox to increase the energy density of lithium-ion batteries, but it is challenging to achieve good cycle life at high voltages >4.5 V (versus Li/Li+). Here we report a family of Li-excess Mn-rich cathodes that integrates rocksalt- and polyanion-type structures. Following design rules for cation filling and ordering, we demonstrate the bulk incorporation of polyanion groups into the rocksalt lattice. This integration bridges the two primary families of lithium-ion battery cathodes—layered/spinel and phosphate oxides—dramatically enhancing the cycling stability of disordered rocksalt cathodes with 4.8 V upper cut-off voltage. The cathode exhibits high gravimetric energy densities above 1,100 Wh kg−1 and >70% retention over 100 cycles. This study opens up a broad compositional space for developing battery cathodes using earth-abundant elements such as Mn and Fe.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
MIT.nano
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Creative Commons Attribution-Noncommercial-ShareAlike
Attribution-NonCommercial-ShareAlike 4.0 International
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DOI of Published Version
https://doi.org/10.1038/s41560-024-01615-6
