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Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni 0.9 Mn 0.1 ]O 2 Cathode
Author(s) -
Aishova Assylzat,
Park GeonTae,
Yoon Chong S.,
Sun YangKook
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903179
Subject(s) - cathode , materials science , cobalt , cycling , nickel , chemical engineering , metallurgy , chemistry , archaeology , engineering , history
Li[Ni 0.9 Co 0.1 ]O 2 (NC90), Li[Ni 0.9 Co 0.05 Mn 0.05 ]O 2 (NCM90), and Li[Ni 0.9 Mn 0.1 ]O 2 (NM90) cathodes are synthesized for the development of a Co‐free high‐energy‐density cathode. NM90 maintains better cycling stability than the two Co‐containing cathodes, particularly under harsh cycling conditions (a discharge capacity of 236 mAh g −1 with a capacity retention of 88% when cycled at 4.4 V under 30 °C and 93% retention when cycled at 4.3 V under 60 °C after 100 cycles). The reason for the enhanced stability is mainly the ability of NM90 to absorb the strain associated with the abrupt anisotropic lattice contraction/extraction and to suppress the formation of microcracks, in addition to enhanced chemical stability from the increased presence of stable Mn 4+ . Although the absence of Co deteriorates the rate capability, this can be overcome as the rate capability of the NM90 approaches that of the NCM90 when cycled at 60 °C. The long‐term cycling stability of NM90 is confirmed in a full cell, demonstrating that it is one of the most promising Co‐free cathodes for high‐energy‐density applications. This study not only provides insight into redefining the role of Mn in a Ni‐rich cathode, it also represents a clear breakthrough in achieving a commercially viable Co‐free Ni‐rich layered cathode.