A metal-ion-chelating organogel electrolyte for Le Chatelier depression of Mn³⁺disproportionation of lithium manganese oxide spinel

Abstract

Mn dissolution resulting from Mn3+ disproportionation in lithium manganese oxide spinel was significantly depressed by a metal-ion-chelating organogel electrolyte.

Deep‐Eutectic‐Solvent‐Based Self‐Healing Polymer Electrolyte for Safe and Long‐Life Lithium‐Metal Batteries

“…Theresulting Mn 2+ ions are highly soluble in the electrolyte,w hich leads to rapid capacity fading.T his dissolution issue becomes more severe at elevated temperature. [39] As aresult, the Li jjLMO cell with DES electrolyte exhibited an extremely short cycle life of only 11 cycles (Figure 6a). Meanwhile,t he Li j DES + FEC electrolyte j LMO cell showed capacity fading from 90 to 33 mA hg À1 during 50 cycles (see Figure S17).…”

Deep‐Eutectic‐Solvent‐Based Self‐Healing Polymer Electrolyte for Safe and Long‐Life Lithium‐Metal Batteries

“…The resulting Mn 2+ ions are highly soluble in the electrolyte, which leads to rapid capacity fading. This dissolution issue becomes more severe at elevated temperature . As a result, the Li||LMO cell with DES electrolyte exhibited an extremely short cycle life of only 11 cycles (Figure a).…”

“…Meanwhile,t he LiF content in the CEI clearly increased, which was associated with adecline in the content of organic species (see Figure S19), thus resulting in enhanced CEI robustness. [37] Such athin and strong CEI layer together with the cross-linking polymer matrix of the DSP electrolyte efficiently hinder manganese dissolution, [39] thus leading to improved cycling performance at elevated temperature (Figure 6a).…”

Preactivation Strategy for a Wide Temperature Range In Situ Gel Electrolyte-Based LiNi0.5Co0.2Mn0.3O2∥Si–Graphite Battery

“…Comparatively, all three residual transition metals detected on the IGPE-A sample are further declined, and the content of Co is dramatically reduced. In the NCM cathode, Co and Mn elements are generally conducive to stabilize the layered structure of the material and are essential to the cycle stability of LIBs . The consequence demonstrates that the in situ gel electrolyte of IGPE-A can efficiently reduce the deposition of the transition metals on the surface of the anode.…”

“…In the NCM cathode, Co and Mn elements are generally conducive to stabilize the layered structure of the material and are essential to the cycle stability of LIBs. 56 The consequence demonstrates that the in situ gel electrolyte of IGPE-A can efficiently reduce the deposition of the transition metals on the surface of the anode. Combined with the SEM images, it is inferred that the gelation process of the electrolyte not only inhibits the volume change of the anode but also protects the cathode from metal migration.…”