State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
Sci Rep. 2017 Jun 12;7(1):3276. doi: 10.1038/s41598-017-03603-1.
Inspired by nature, herein we designed a novel construction of SnO anodes with an extremely high lithium storage performance. By utilizing small sheets of graphene oxide, the partitioned-pomegranate-like structure was constructed (SnO@C@half-rGO), in which the porous clusters of SnO nanoparticles are partially supported by reduced graphene oxide sheets while the rest part is exposed (half-supported), like partitioned pomegranates. When served as anode for lithium-ion batteries, SnO@C@half-rGO exhibited considerably high specific capacity (1034.5 mAh g after 200 cycles at 100 mA g), superior rate performance and remarkable durability (370.3 mAh g after 10000 cycles at 5 A g). When coupled with graphitized porous carbon cathode for lithium-ion hybrid capacitors, the fabricated devices delivered a high energy density of 257 Wh kg at ∼200 W kg and maintained 79 Wh kg at a super-high power density of ∼20 kW kg within a wide voltage window up to 4 V. This facile and scalable approach demonstrates a new architecture for graphene-based composite for practical use in energy storage with high performance.
受自然启发，我们设计了一种具有极高储锂性能的新型 SnO 阳极结构。利用小的氧化石墨烯片，构建了分隔石榴状结构（SnO@C@half-rGO），其中多孔 SnO 纳米粒子簇部分由还原氧化石墨烯片支撑，其余部分暴露（半支撑），就像分隔的石榴。作为锂离子电池的阳极，SnO@C@half-rGO 表现出相当高的比容量（在 100 mA g 下循环 200 次后为 1034.5 mAh g）、优异的倍率性能和显著的循环稳定性（在 5 A g 下循环 10000 次后为 370.3 mAh g）。当与石墨化多孔碳阴极用于锂离子混合电容器时，所制备的器件在 200 W kg 的高功率密度下提供了 257 Wh kg 的高能量密度，并且在 4 V 的宽电压窗口内保持了 79 Wh kg 的能量密度，该能量密度在 20 kW kg 的超高功率密度下也能维持。这种简单且可扩展的方法为基于石墨烯的复合材料提供了一种新的架构，可用于高性能储能的实际应用。
