Abstract
In this work, we synthesized a new type of Ge coating for a 3D porous carbon on a Ni foam surface (3D-Void/Ge@C) using simple ionic liquid electrodeposition and annealing at low temperature. When the 3D-Void/Ge@C composite is used as a LIB anode, the 3D porous carbon sheet formed micro-nano voids as a highly efficient “bumper” to accommodate the large volume expansion of Ge. As a result, the as-prepared anode exhibited superior Li-storage capacity, delivered a first cycle discharge/charge specific capacity of 2019.9/1592.9 mA h g−1 at 0.1 mA g−1, and a discharge specific capacity that was more than 990 mA h g−1 after 100 cycles. With a high capacity and stable Li-storage performance, the well-designed composite may indicate a new strategy to promote further application of Ge-based anode materials in new high-performance LIBs in the future.
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