MXene Electrodes for All Strain-Free Solid-State Batteries

doi:10.1021/acsami.4c12065

MXene Electrodes for All Strain-Free Solid-State Batteries

2024-10-09

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DOI：10.1021/acsami.4c12065

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All-solid-state batteries with nonflammable inorganic solid electrolytes are the key to addressing the safety issues of lithium-ion batteries with flammable organic liquid electrolytes. However, conventional electrode materials suffer from substantial volume changes during Li+ (de)intercalation, leading to mechanical failure of interfaces between electrode materials and solid electrolytes and then severe performance degradation. In this study, we report strain-free charge storage via the interfaces between transition metal carbides (MXenes) and solid electrolytes, where MXene shows negligible structural changes during Li+ (de)intercalation. Operando scanning electron transmission microscopy with electron energy-loss spectroscopy reveals the pillar effect of trapped Li+ in the interlayer spaces of MXene to achieve the strain-free features. An all strain-free solid-state battery, which consists of a strain-free Ti3C2Tx negative electrode and a strain-free disordered rocksalt Li8/7Ti2/7V4/7O2 positive electrode, demonstrates long-term stable operation while preserving the interfacial contact between electrode materials and solid electrolytes.

Keywords:

MXene

all-solid-state battery

solid electrolyte

lithium-ion

interface

STEM-EELS

digital twin

MXene Electrodes for All Strain-Free Solid-State Batteries

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