(X) graphite‐(100‐X) vanadium‐phosphorus glass composite anode with stable cycling performance for lithium‐ion batteries

Abstract Currently, transition metal oxides (TMOs) are increasingly recognized as viable anode materials for lithium‐ion batteries (LIBs). Among them, V 2 O 5 has become a research focus in view of its high theoretical specific capacity, but its relatively low electrical conductivity and practical cycling capacity limit its application. It is shown that the amorphous V 2 O 5 ‐P 2 O 5 negative electrode material, due to its glassy structure, on the one hand, inhibits the volume strain and particle pulverization of graphite and vanadium components during charging and discharging processes and reduces the volume expansion phenomenon in battery cycling, and, on the other hand, the formation of ion‐conducting interfacial layer (PO 4 3 with Li⁺ ‐network) to promote lithium ion transport, which has a broad application prospect. Based on this, a series of (X) graphite‐(100‐X) vanadium‐pentoxide glass composite anode materials were prepared by mechanical ball milling method in this paper. The addition of graphite provides a stable layered structure and conductive network, realizes the reversible embedding/de‐embedding of lithium ions, improves the electrical conductivity of the composite materials, and reduces the charge transfer resistance of vanadium‐phosphorus glass anode materials in the cycling process. The performance of the five groups of composite anode materials showed an increasing and then decreasing trend, with the best performance observed in the 40% graphite‐60% vanadium‐based glass composites sample. Even after undergoing 500 cycles at 500 mA·g −1 , the material maintained high discharge and charge capacities of 509.3 and 510.2 mAh·g −1 , respectively, and the electrode sheet's surface remained relatively flat after cycling, with no obvious swelling, showing excellent cycling stability.