Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries

Abstract

For the first time, a multi-anionic and multi-cationic high entropy oxyhalide is presented as high capacity cathode for Li-ion batteries.

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

“…The initial specific discharge or lithiation capacity was 117 mAh/g Li(HEO)F and decreased in a rather linear fashion to 86 mAh/g Li(HEO)F during the first 30 cycles. However, thereafter, the specific capacity starts to increase again, as shown recently . Similar to the HEO anode, the first‐cycle Coulombic efficiency was relatively low but stabilized above 95 % after the 5 th cycle.…”

“…The Li(HEO)F cathode material was prepared by mechanochemistry using HEO and LiF as precursors. During the milling process, both the Li + and F − ions are incorporated into the rock‐salt lattice, producing an insertion cathode material with a working potential of ∼3.4 V versus Li + /Li . The cyclability of a Li(HEO)F‐based LIB half‐cell with LP57 electrolyte at a C/8 rate in the voltage range between 2.0 and 4.6 V versus Li + /Li is shown in Figure .…”

“…Very recently, a new class of multicomponent electrode materials has been reported, which seems promising for the development of next‐generation LIBs . These materials exhibit tailorable properties and good cycling performance and belong to the so‐called high‐entropy oxides (HEOs).…”

“…In such HEOs, S config is determined not only by the elements on the cation sublattice but also the different anion species. One such compound with S config =2.19 R, a high‐entropy rock‐salt oxyfluoride, Li(Co 0.2 Cu 0.2 Mg 0.2 Ni 0.2 Zn 0.2 )OF (referred to as Li(HEO)F), was produced by mechanochemistry . This particular material was found to exhibit promising electrochemical properties as a cathode active material for LIB applications.…”

Challenges and perspectives for manganese‐based oxides for advanced aqueous zinc‐ion batteries

“…To date, diverse rechargeable batteries with different charge carriers (such as Li + , Na + , K + , Ca 2+ , Mg 2+ , Zn 2+ , and Al 3+ ) have been successfully demonstrated in organic or aqueous systems . Generally, owing to the wider electrochemical window of organic electrolyte, nonaqueous batteries always exhibit higher energy density than the aqueous one.…”