Metal-organic frameworks derived germanium oxide nanosheets for large reversible Li-ion storage

Metal-organic frameworks derived germanium oxide nanosheets for large reversible Li-ion storage
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金属有机框架衍生的氧化锗纳米片用于大型可逆锂离子存储

DOI:
10.1016/j.elecom.2017.09.019
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发表时间:
2017-11
影响因子:
5.4
通讯作者:
Wang Yong
Wang Yong
中科院分区:
工程技术3区
文献类型:
--
作者:
Zhang Wenbo;Pang Huicong;Sun Weiwei;Lv Li-Ping;Wang Yong

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采用Ge基金属有机骨架前驱体[C6 H10(NH 2)2Ge 3 O 6]制备了二维GeO 2纳米片。所获得的微米尺寸的GeO 2纳米片在长循环期间提供上级的锂存储能力(在100 mA g − 1下初始可逆容量为1315 mAh g− 1,并且在350次循环后保留容量为1393 mAh g− 1)。所观察到的大容量和良好的循环性能主要归因于其从MOF前体继承的纳米片结构,这可以促进电解质注入和锂扩散,保持结构稳定性,并减轻重复锂化/脱锂过程中电极的大体积变化。
A Ge-based metal-organic framework (MOF) precursor [C6H10(NH2)2Ge3O6] is used to fabricate two-dimensional GeO2nanosheets in this work. The obtained micrometer-sized GeO2nanosheet delivers superior lithium-storage capability during long cycling (an initial reversible capacity of 1315 mAh g− 1at 100 mA g− 1and the retained capacity of 1393 mAh g− 1after 350 cycles). The observed large capacity and good cyclability have been mainly attributed to its nanosheet structure inherited from the MOF precursor, which can facilitate the electrolyte infusion and the lithium diffusion, maintain the structural stability, and alleviate the large volume change of the electrode during repetitive lithiation/delithiation process.
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