Nitrogen and sulfur dual-doped carbon films as flexible free-standing anodes for Li-ion and Na-ion batteries

作者：Ruan, Jiafeng; Yuan, Tao; Pang, Yuepeng; Luo, Sainan; Peng, Chengxin; Yang, Junhe; Zheng, Shiyou^*

来源：Carbon, 2018, 126: 9-16.

DOI：10.1016/j.carbon.2017.09.099

• Film
• Free-standing anode
• Dual-doped
• Lithium-ion battery
• Sodium-ion battery

Heteroatom doping is considered to be one of the most effective approaches to improve the electrochemical activity of carbon-based electrode materials for both Li-ion batteries (LIBs) and Na-ion batteries (SIBs) due to introduction of unbalanced electron atmosphere and enlarged interlayers of carbon materials. Here, we present nitrogen and sulfur dual-doped flexible carbon (NS-C) film as a promising freestanding anode for stable high-power and high-energy LIBs or SIBs. The NS-C film delivers high reversible capacities of 965.7 mAh g(-1) in LIBs and 520.1 mAh g(-1) in SIBs at a current density of 100 mA g(-1). Particularly, the film electrodes exhibit excellent high-rate capability and remarkable longterm cyclability. For instance, as a LIBs anode, the NS-C film remained a high capacity of 357.2 mAh g(-1) at 2.0 A g(-1)(similar to 10 min to full charge) after 2000 cycles; even in SIBs, a capacity of 155 mAh g(-1) can also be reached at 1.0 A g(-1). It is believed that the interconnected conducting structure of carbon backbones, heteroatomic defects and increased carbon interlayers distance by stable S-C and N-C bonds are beneficial to ultrafast ion diffusion and electron transport, making the NS-C film become a high performance free-standing anode for LIBs or SIBs application.

• 出版日期2018-1
• 单位上海理工大学