High
voltage spinel manganese oxide LiNi0.5Mn1.5O4 (LNMO) cathodes are promising for practical
applications owing to several strengths including high working voltages,
excellent operating safety, low costs, and so on. However, LNMO-based
lithium–ion batteries (LIBs) fade rapidly mainly owing to unqualified
electrolytes, hence becoming a big obstacle toward practical applications.
To tackle this roadblock, substantial progress has been made thus
far, and yet challenges still remain, while rare reviews have systematically
discussed the status quo and future development of electrolyte optimization
coupling with LNMO cathodes. Here, we discuss cycling degradation
mechanisms at the cathode/electrolyte interface and ideal requirements
of electrolytes for LNMO cathode-equipped LIBs, as well as review
the recent advance of electrolyte optimization for LNMO cathode-equipped
LIBs in detail. And then, the perspectives regarding the future research
opportunities in developing state-of-the-art electrolytes are also
presented. The authors hope to shed light on the rational optimization
of advanced organic electrolytes in order to boost the large-scale
practical applications of high voltage LNMO cathode-based LIBs.
Polymer electrolytes‐based lithium metal batteries have attracted much more attention for next‐generation energy storage devices owing to their high energy density and superior safety characteristics. However, there are still some obstacles to ameliorate interfacial compatibility between conventional polymer electrolytes with lithium metal anode and high‐voltage cathodes. It is noted that poly (maleic anhydride) copolymers (PMAC)‐based polymer electrolytes (PEs) exhibit superior interfacial compatibility with both lithium metal anode and high‐voltage cathodes in virtue of their distinctive structure. These superb characteristics will endow PMAC‐based PEs very promising candidate to develop highly safe and high‐energy‐density lithium metal batteries. So far, PMAC‐based PEs have been widely used in lithium metal batteries and high‐voltage lithium metal batteries because of their prominent advantages. Herein, recent key advances of PMAC‐based PEs are summarized. The key factors affecting ionic conductivity are elaborated in terms of structural control of PMAC, lithium salts, fillers, and plasticizers. Moreover, the interfacial compatibility of PMAC‐based PEs with lithium metal anode and high‐voltage cathodes is also discussed in details. Furthermore, potential challenges and prospects of PMAC‐based PEs are also envisioned at the end of this review. It is believed that this review will shed light on highly safe and high‐energy‐density lithium metal batteries.
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