Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China.
Nanotechnology. 2020 Jan 17;31(3):035401. doi: 10.1088/1361-6528/ab4848. Epub 2019 Sep 26.
High capacity and stable anodes are demanded since the current graphite-based anode does not meet the high-performance requirements of emerging Li-ion battery systems. Herein, we present a novel spring-shaped hierarchical SiO@CoO nanowire composite, which exhibits good Li-storage performance. The special structure is able to effectively accommodate the change in structure during charge-discharge, and the coaxial hierarchical morphology enables rapid Li ion and electron transfer. The spring-shaped SiO@CoO anode exhibits a capacity of 770 mAh g, along with a high Coulombic efficiency of 99.8% after 400 cycles. A stable rate performance even after three rounds of measurements is also achievable. In addition, the real-time lithiation of the SiO@CoO composite is investigated through an in situ transmission electron microscopy technology, which demonstrates the stable structure of the spring-shaped SiO@CoO composite during the rapid lithiation process.
由于目前的石墨基阳极无法满足新兴锂离子电池系统的高性能要求，因此需要高容量和稳定的阳极。在此，我们提出了一种新颖的弹簧状分级 SiO@CoO 纳米线复合材料，具有良好的储锂性能。特殊的结构能够有效适应充放电过程中的结构变化，而共轴的分级形态则能实现快速的锂离子和电子转移。弹簧状 SiO@CoO 阳极具有 770 mAh g 的容量，经过 400 次循环后，库仑效率高达 99.8%。即使经过三轮测试，也能实现稳定的倍率性能。此外，还通过原位透射电子显微镜技术研究了 SiO@CoO 复合材料的实时锂化过程，证明了弹簧状 SiO@CoO 复合材料在快速锂化过程中的稳定结构。
