Accurate Control of Multishelled Co3O4Hollow Microspheres as High-Performance Anode Materials in Lithium-Ion Batteries
Accurate Control of Multishelled Co3O4Hollow Microspheres as High-Performance Anode Materials in Lithium-Ion Batteries
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DOI：
10.1002/ange.201301622
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发表时间：
2013-06
影响因子：
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通讯作者：
Jiangyan Wang;Nailiang Yang;Hongjie Tang;Zhenghong Dong;Quan Jin;Mei Yang;D. Kisailus;Huijun Zhao-Huijun
中科院分区：
文献类型：
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作者：
Jiangyan Wang;Nailiang Yang;Hongjie Tang;Zhenghong Dong;Quan Jin;Mei Yang;D. Kisailus;Huijun Zhao-Huijun
由于具有能量密度高、重量轻、循环寿命长的特点，可充电锂离子电池（lib）已成为便携式电子设备的主要电源之一。随着对更高容量和安全性的需求不断增长，人们为开发下一代锂离子电池的替代高性能电极材料做出了大量努力例如，由过渡金属氧化物制成的阳极电极显示出的可逆容量是基于传统石墨材料的阳极电极的两到三倍（< 372 mA hg À1）。[1b]在各种类型的过渡金属氧化物中，氧化钴（Co3O4）受到了特别的关注，因为它有望具有高容量（约1000 mAhgÀ1）和优异的循环性能。不幸的是，尽管迄今为止，通过使用Co3O4微/纳米材料，Co3O4的最佳容量已经增加到1450mAhgÀ1，但Co3O4阳极电极用于锂离子电池的实际应用仍然受到循环时容量保持差和/或倍率能力低的阻碍为了避免这些问题，基于以下考虑，空心微纳米结构被用来代替固体微纳米结构作为锂离子电池的阳极材料：1)由于增加了电极-电解质接触面积，空心结构的表面积更大，锂离子可以更好地进入。2)中空的内部提供了额外的自由空间，以缓解压力
Owing to their high energy density, light weight, and long cycle life, rechargeable lithium-ion batteries (LIBs) have become one of the dominant power sources for portable electronic devices. With the growing need for higher capacity and safety, numerous efforts have been made to develop alternative high-performance electrode materials for nextgeneration LIBs.[1] For example, anode electrodes made of transition-metal oxides have been found to exhibit reversible capacities about two or three times as large as those based on conventional graphite materials (< 372 mA hg À1).[1b] Among various types of transition-metal oxides, cobalt oxide (Co3O4) has received special attention, since it is expected to have a high capacity (about 1000 mAhgÀ1) and excellent cycling performance.Unfortunately, although the best capacity of Co3O4 to date has increased to 1450mAhgÀ1 through the use of Co3O4 micro-/nanomaterials,[2] the practical use of Co3O4 anode electrodes for LIBs is still largely hindered by their poor capacity retention upon cycling and/or low rate capability.[3] To circumvent these issues, hollow micro-/nanostructures have been used instead of solid micro-/nanostructures as LIB anode materials on the basis of the following considerations:[4] 1) The larger surface area of the hollow structures enables better access for lithium ions as a result of the increased electrode–electrolyte contact area. 2) The hollow interior provides additional free volume to alleviate the