Iron‐phosphate glass‐ceramic anodes for lithium‐ion batteries

The oxide glass-based anodes for lithium-ion Batteries (LiBs) still suffer from two critical drawbacks, that is, low reversible capacity and electrical conductivity. Here, we report a new way to overcome the drawbacks. Specifically, chose 50Fe2O3–50P2O5 (50Fe50P) glass as anode material LiBs, then thermally treat it at 1118 K (Tg+345 K) 0.5 h under reducing atmosphere (5 mol% H2+95 Ar). thermal reduction treatment led formation of Fe2(P4O12) Fe2Fe5(P2O7)4 crystals. reduced LiBs exhibits 373 mA g−1 after 1 000 charge/discharge cycles A g−1, which is higher than oxidized one. greatly lowers charge transfer resistance in anode, indicating enhancement This performance improvement could arise increase accessible active sites Li+ ion storage due existence crystal–crystal/crystal–glass boundaries, well electron between Fe2+ Fe3+ during cycling. reduction–crystallization approach help develop high-performance glass-ceramics based advanced LiBs.