A facile route to dually protected Ge@GeO2 composites as anode materials for lithium ion battery
A facile route to dually protected Ge@GeO2 composites as anode materials for lithium ion battery
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DOI：
10.1016/j.cej.2016.03.126
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发表时间：
2016-07
影响因子：
15.1
通讯作者：
R. Xu;Songping Wu;Yao Du;Zhen Zhang
中科院分区：
文献类型：
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作者：
R. Xu;Songping Wu;Yao Du;Zhen Zhang
采用简便的路线制备了非晶碳@石墨烯纳米片@Ge@GeO2(a-C@GNs@Ge@GeO2)复合材料，该复合材料可用作锂离子电池的先进负极材料。通过镁热还原、水热反应和热处理，成功形成了合理设计的Ge@GeO2双重保护层，即封装非晶碳和覆盖石墨烯纳米片。结果，设计的复合电极在10°C低温下循环50次后，在800 mA g−1的电流密度下提供了729 mAh g−1的显着容量，每循环容量衰减低至0.12%，具有优异的倍率性能。特别值得注意的是，a-C@GNs@Ge@GeO2 的电化学性能具有高热敏性。这些优点使得a-C@GNs@Ge@GeO2成为有前途的电动汽车先进锂离子电池负极材料。
A facile route has been adopted to yield amorphous carbon@graphene nanosheets@Ge@GeO2(a-C@GNs@Ge@GeO2) composites, which were utilized as advanced anode materials for Li-ion battery. The rationally designed dual-protection for Ge@GeO2, i.e. encapsulation of amorphous carbon and cover of graphene nanosheets, has been successfully formed by magnesiothermic reduction and hydrothermal reaction followed by heat treatment. As a consequence, the designed composite electrode delivered a remarkable capacity of 729 mAh g−1at a current density of 800 mA g−1after 50 cycles at low temperature of 10 °C, with low capacity fading of 0.12% per cycle and excellent rate capability. Of special note is that high thermosensitivity of electrochemical performance of a-C@GNs@Ge@GeO2has been observed. These advantages make a-C@GNs@Ge@GeO2promising anode materials of advanced Li-ion battery for electric vehicle.