设计和制备了一种基于类石墨烯片的三维多孔碳负载纳米锗作为高容量锂离子电池负极材料。所制备的复合负极中纳米锗颗粒大小为50～500nm,均匀负载在由类石墨烯片构成的三维多孔导电网络中,有效地避免了热处理下Ge颗粒长大的问题。相比于纯Ge负极,复合负极具有优异的电化学性能:0.2C倍率下首次放电比容量高达1530.49mAh/g,循环80周后为910.32mAh/g,为纯Ge负极的1.89倍;2C倍率下放电比容量为881.28mAh/g,为纯Ge负极的2.01倍。
A highly conductive 3D porous graphene-like carbon embedded with nano-Ge particles was designed and prepared as high-capacity anode material for Li-ion batteries.The size of Ge nanoparticles in the prepared composite anode was 50～500nm,which were uniformly embeded in the 3D-GPNS graphene-like carbon network.the unique 3D porous carbon network could effectively prevent Ge particle growth under heat treatment.The anode had better electrochemical performance compared with pure Ge anode.At 0.2C rate,the anode delivered the initial discharge capacity of 1530.49mAh/g,and after 80 cycles the specific discharge capacity was 910.32mAh/g,which was 1.89 times than that of the pure Ge anode.At 2C rate,the specific discharge capacity of the anode was 881.28mAh/g,which was 2.01 times than that of pure Ge cathode.
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基金资助
国家自然科学基金(21875282);国防科技大学科研计划(ZK19-27);国防科技大学空天科学学院青年人才项目(QR21-02)
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