Ni-rich layered cathodes have been
regarded as one of the high-priority
materials, but their commercial application was limited by the highly
active surfaces, poor thermal stability, and irreversible phase transition.
Furthermore, when they are stored in moist air, the particles can
easily form an impurity layer of Li2CO3/LiOH.
This inert substance hinders the transmission of lithium ions and
electrons, leading to electrochemical performance deterioration. Herein,
we report a simple method, namely, metaphosphate repair, which can
successfully restore the degraded LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode materials and form
an in situ multifunctional hybrid repaired layer of Li3PO4-YPO4-Y(PO3)3 on the
secondary particle. The repaired NCM811 delivers a discharge capacity
of 171.7 mAh g–1 after 100 cycles, which is much
higher than those of pristine (147.6 mAh g–1) and
stored degraded (116.2 mAh g–1) samples. Moreover,
the restored sample could deliver a capacity retention of 92.3% after
100 cycles at 1C along with a better initial Coulombic efficiency
(CE) of 88.4%. This study provides a facile strategy to revive degraded
Ni-rich cathode materials and other similar layered oxide cathodes
for advanced batteries.
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