Influence of Size on the Rate of Mesoporous Electrodes for Lithium Batteries
Influence of Size on the Rate of Mesoporous Electrodes for Lithium Batteries
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DOI：
10.1021/ja905488x
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发表时间：
2010-01-27
影响因子：
15
通讯作者：
Bruce, Peter G.
中科院分区：
文献类型：
--
作者：
Ren, Yu;Armstrong, A. Robert;Bruce, Peter G.
高功率可充电锂电池是运输和负载均衡的关键目标，以减少二氧化碳排放。已经证明介孔锂嵌入化合物（由含有纳米直径孔的颗粒组成，由相似大小的壁隔开）可以提供高速率（功率）和高稳定性的循环。在这里，我们研究了孔径和壁厚的临界尺寸如何控制插层（电极反应）的速率。通过使用介孔β - mno2，在同一材料中研究了这些介孔尺寸对锂通过单相和两相插层过程的影响，从而进行了直接比较。孔隙大小和壁厚都影响单相和两相插层机制的速率，但后者比前者更敏感。
High power rechargeable lithium batteries are a key target for transport and load leveling, in order to mitigate CO2 emissions. It has already been demonstrated that mesoporous lithium intercalation compounds (composed of particles containing nanometer diameter pores separated by walls of similar size) can deliver high rate (power) and high stability on cycling. Here we investigate how the critical dimensions of pore size and wall thickness control the rate of intercalation (electrode reaction). By using mesoporous beta-MnO2, the influence of these mesodimensions on lithium intercalation via single and two-phase intercalation processes has been studied in the same material enabling direct comparison. Pore size and wall thickness both influence the rate of single and two-phase intercalation mechanisms, but the latter is more sensitive than the former.