Carbon-, Binder-, and Precious Metal-Free Cathodes for Non-Aqueous Lithium鈥揙xygen Batteries: Nanoflake-Decorated Nanoneedle Oxide Arrays
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- 作者：Ahmer Riaz ; Kyu-Nam Jung ; Wonyoung Chang ; Kyung-Hee Shin ; Jong-Won Lee
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：October 22, 2014
- 年：2014
- 卷：6
- 期：20
- 页码：17815-17822
- 全文大小：541K
- ISSN：1944-8252
文摘
Rechargeable lithium鈥搊xygen (Li鈥揙2) batteries have higher theoretical energy densities than today鈥檚 lithium-ion batteries and are consequently considered to be an attractive energy storage technology to enable long-range electric vehicles. The main constituents comprising a cathode of a lithium鈥搊xygen (Li鈥揙2) battery, such as carbon and binders, suffer from irreversible decomposition, leading to significant performance degradation. Here, carbon- and binder-free cathodes based on nonprecious metal oxides are designed and fabricated for Li鈥揙2 batteries. A novel structure of the oxide-only cathode having a high porosity and a large surface area is proposed that consists of numerous one-dimensional nanoneedle arrays decorated with thin nanoflakes. These oxide-only cathodes with the tailored architecture show high specific capacities and remarkably reduced charge potentials (in comparison with a carbon-only cathode) as well as excellent cyclability (250 cycles).