Using an electrolyte additive enables a nickel-rich layered cathode to be cycled at high voltages and still retain 97% of its initial capacity after 200 cycles. The decomposition of the electrolyte additive leads to the formation of a robust interphase that protects the surface of the cathode, preserving the capacity and preventing cracks.
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Mao, Y. et al. High voltage charging induced strain, heterogeneity, and micro cracks in secondary particles of a nickel rich layered cathode material. Adv. Funct. Mater. 29, 1900247 (2019). This paper reports the formation of cracks in a NMC cathode at high voltages and provides a particle-level degradation mechanism.
Zhang, S. et al. Identifying and addressing critical challenges of high-voltage layered ternary oxide cathode materials. Chem. Mater. 31, 6033–6065 (2019). A review article that presents the challenges facing high-voltage cathodes and proposes various strategies to resolve these problems.
Xue, W. et al. Ultra-high-voltage Ni-rich layered cathodes in practical Li metal batteries enabled by a sulfonamide-based electrolyte. Nat. Energy. 6, 495–505 (2021). This paper reports a new electrolyte solvent for Ni-rich NMC cathode high-voltage cycling.
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This is a summary of: Tan, S. et al. Additive engineering for robust interphases to stabilize high-Ni layered structures at ultra-high voltage of 4.8 V. Nat. Energy https://doi.org/10.1038/s41560-022-01020-x (2022).
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An electrolyte additive allows stable high-voltage cycling of a nickel-rich layered cathode. Nat Energy 7, 482–483 (2022). https://doi.org/10.1038/s41560-022-01021-w