Lithium difluoro(bisoxalato)phosphate (LiDFBP) is introduced as a novel lithium‐salt‐type electrolyte additive for lithium‐rich cathodes in lithium‐ion batteries. The investigation reveals that LiDFBP is oxidized to form a uniform and electrochemically stable solid electrolyte interphase (SEI) on the lithium‐rich cathode. The LiDFBP‐derived SEI layer effectively suppresses severe electrolyte decomposition at high voltages and mitigates the voltage decay of the lithium‐rich cathodes caused by undesirable phase transformation to spinel‐like phases during cycling. Furthermore, the cell with electrolyte containing LiDFBP achieves substantially improved cycling performance and delivers a high discharge capacity of 116 mA h g−1 at a high C rate (20 C). The unique function of the LiDFBP additive on the surface chemistry of lithium‐rich cathodes is confirmed through X‐ray photoelectron spectroscopy, SEM, and TEM analyses.
The front cover artwork is provided by the group of Nam‐Soon Choi at Ulsan National Institution Science Technology, Republic of Korea. The image shows lithium difluoro(bisoxalato) phosphate as an oxidizable additive for in‐situ formation of a stable artificial solid electrolyte interphase layer on the Li‐rich cathode. Read the full text of the Article at 10.1002/celc.201600297.
The Front Cover picture illustrates the lithium difluoro(bisoxalato)phosphate (LiDFBP)‐derived solid electrolyte interphase layer effectively suppressing unwanted electrolyte decomposition at high voltages and mitigating the voltage decay of lithium‐rich cathodes caused by phase transformation to spinel‐like phases during cycling. More information can be found in the Article by N.‐S. Choi and co‐workers on page 56 in Issue 1, 2017 (DOI: 10.1002/celc.201600297).
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