A high-rate, high-capacity, nanostructured tin oxide electrode
A high-rate, high-capacity, nanostructured tin oxide electrode
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DOI：
10.1149/1.1391134
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发表时间：
2000-07-01
影响因子：
--
通讯作者：
Scrosati, B
中科院分区：
文献类型：
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作者：
Li, NC;Martin, CR;Scrosati, B
最近，衍生自锡氧化物的锂离子电池阳极已经引起了相当大的兴趣，因为它们原则上可以存储超过石墨两倍的Li+。然而，当Li+插入这些Sn基材料和从这些Sn基材料中移除时，发生大的体积变化，这导致电极的内部损坏，导致容量和可再充电性的损失。我们在这里描述了一种纳米结构的SnO 2基电极，其具有非凡的倍率性能，可以提供非常高的容量（例如，>700 mAh g（-1）在8 C倍率下），并且仍然保持放电和再充电多达800次循环的能力。这些电极，通过模板法制备，由单分散的110 nm直径的SnO 2纳米纤维从集电器表面突出，像刷毛。显著改善的速率和循环性能与构成电极的纳米纤维的小尺寸和纳米纤维内Sn晶粒的小畴尺寸有关。(C)2000年电化学学会。S1099-0062（00）03-041-8。All rights reserved.
Recently, Li-ion battery anodes derived from oxides of tin have been of considerable interest because they can, in principle, store more than twice as much Li+ as graphite. However, large volume changes occur when Li+ is inserted and removed from these Sn-based materials, and this causes internal damage to the electrode resulting in loss of capacity and rechargeability. We describe here a nanostructured SnO2-based electrode that has extraordinary rate capabilities, can deliver very high capacities (e.g., >700 mAh g(-1) at the 8C rate), and still retain the ability to be discharged and recharged for as many as 800 cycles. These electrodes, prepared via the template method, consist of monodisperse 110 nm diam SnO2 nanofibers protruding from a current-collector surface like the bristles of a brush. The dramatically improved rate and cycling performance are related to the small size of the nanofibers that make up the electrode and the small domain size of the Sn grains within the nanofibers. (C) 2000 The Electrochemical Society. S1099-0062(00)03-041-8. All rights reserved.