期刊
CHEM
卷 4, 期 9, 页码 2124-2139出版社
CELL PRESS
DOI: 10.1016/j.chempr.2018.05.018
关键词
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资金
- US Department of Energy Office of Science Division of Materials Sciences and Engineering [DE-SC0005397]
- Texas Advance Computing Center
- National Key R&D Program of China [2016YFA0202500]
By virtue of their prominent advantages in terms of capacity and voltage output and cost, O3-type layered transition-metal oxides are considered promising cathode materials for sodium-ion batteries (SIBs). However, their unstable electrochemistry at high voltages due to complex multiphase evolution in the bulk structure and continuous degradation of the electrolyte-cathode interphase hampers their practical viability. Here, we reveal a dual-stabilization effect of the cation dopants on the evolution of the bulk structure and electrode-electrolyte interphase of a Li-substituted O3-type cathode upon Na (de) intercalation. The incorporation of Li into the transition-metal layer could mitigate the Jahn-Teller distortion of the Ni3+ ion and prevent the loss of active transition-metal ions so that the unfavorable high-voltage phase transition and the degradation of the electrolyte-cathode interphase are suppressed. As a result, the Li-incorporated cathode material displays a high reversible capacity with good high-voltage durability to facilitate its service in high-energy-density SIBs.
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