Publication date: 10th April 2024
All-solid-state batteries with non-flammable inorganic solid electrolytes are a key technology to address the safety issues of lithium-ion batteries with flammable organic liquid electrolytes. However, conventional electrode materials suffer from substantial volume change during lithium-ion (de)intercalation, leading to the failure of the interface between the electrode materials and solid electrolytes and then severe performance degradation. In this work, we report strain-free charge storage via an interface between a transition-metal carbide nanosheet (MXene) and solid electrolytes, where MXene shows negligible structural change during lithium-ion (de)intercalation. Combined assessment including operando STEM-EELS elemental mapping clarified the strain-free nature of the MXene electrodes in the all solid-state batteries. In addition, the irreversible reactions at the MXene-electrolyte interface is visualized, explaining the inital irreversible capacities and relatively low rate capability of the MXene electrodes. A strain-free all-solid-state battery, which consists of Ti3C2Tx anode and disordered rocksalt Li8/7Ti2/7V4/7O2 cathode, demonstrates a long-term operation owing to the strain-free nature of both electrode materials.
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