Hou Chao, Lang Xing-You, Han Gao-Feng, Li Ying-Qi, Zhao Lei, Wen Zi, Zhu Yong-Fu, Zhao Ming, Li Jian-Chen, Lian Jian-She, Jiang Qing
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Sci Rep. 2013 Oct 7;3:2878. doi: 10.1038/srep02878.
Nanoarchitectured electroactive materials can boost rates of Li insertion/extraction, showing genuine potential to increase power output of Li-ion batteries. However, electrodes assembled with low-dimensional nanostructured transition metal oxides by conventional approach suffer from dramatic reductions in energy capacities owing to sluggish ion and electron transport kinetics. Here we report that flexible bulk electrodes, made of three-dimensional bicontinuous nanoporous Cu/MnO2 hybrid and seamlessly integrated with Cu solid current collector, substantially optimizes Li storage behavior of the constituent MnO2. As a result of the unique integration of solid/nanoporous hybrid architecture that simultaneously enhances the electron transport of MnO2, facilitates fast ion diffusion and accommodates large volume changes on Li insertion/extraction of MnO2, the supported MnO2 exhibits a stable capacity of as high as ~1100 mA h g(-1) for 1000 cycles, and ultrahigh charge/discharge rates. It makes the environmentally friendly and low-cost electrode as a promising anode for high-performance Li-ion battery applications.
纳米结构的电活性材料可以提高锂嵌入/脱出的速率，显示出真正有潜力提高锂离子电池的功率输出。然而，通过传统方法用低维纳米结构过渡金属氧化物组装的电极，由于离子和电子传输动力学缓慢，能量容量会急剧降低。在此我们报告，由三维双连续纳米多孔铜/二氧化锰复合材料制成并与铜固体集流体无缝集成的柔性块状电极，极大地优化了组分二氧化锰的锂存储行为。由于固体/纳米多孔混合结构的独特整合，同时增强了二氧化锰的电子传输、促进了快速离子扩散并适应了二氧化锰锂嵌入/脱出时的大体积变化，负载的二氧化锰在1000次循环中表现出高达~1100 mA h g⁻¹ 的稳定容量以及超高的充放电速率。这使得这种环保且低成本的电极成为高性能锂离子电池应用中有前景的负极材料。
