Sodium-Ion Batteries: Improving the Rate Capability of 3D Interconnected Carbon Nanofibers Thin Film by Boron, Nitrogen Dual-Doping.

Yang Yang,Zhenzhong Yang,Min Wang,Lin Gu,Qianwang Chen,Yan Yu

doi:10.1002/advs.201600468

Abstract

Boron, nitrogen dual-doping 3D hard carbon nanofibers thin film is synthesized using a facile process. The nanofibers exhibit high specific capacity and remarkable high-rate capability due to the synergistic effect of 3D porous structure, large surface area, and enlarged carbon layer spacing, and the B, N codoping-induced defects.

Highlights

Over the last few years, Na-ion batteries (NIBs) have attracted more and more attention as a low-cost alternative energy system to Li-ion batteries (LIBs), because Na is far more abundant in the earth’s crust than Li and NIBs are environmental friendly for large-scale energy storage.[1,2] the progress of NIBs is slow because there are only few appropriate active materials with long cycle life and high-rate capability for NIBs
We developed a facile and sustainable approach for large-scale production of BN-CNFs by fully infiltrate NH4HB4O7·H2O into the bacterial cellulose (BC) pellicle followed by carbonization
We optimized different geometry configurations of boron and nitrogen doped graphene sheets,[55] and calculated their formation energy as well as adsorption energy of Na atom, which is the key factor for the capacity of NIB

Summary

Introduction

Over the last few years, Na-ion batteries (NIBs) have attracted more and more attention as a low-cost alternative energy system to Li-ion batteries (LIBs), because Na is far more abundant in the earth’s crust than Li and NIBs are environmental friendly for large-scale energy storage (such as solar cell, wind power, and smart grid).[1,2] the progress of NIBs is slow because there are only few appropriate active materials with long cycle life and high-rate capability for NIBs. The large irreversible capacity arises from both the decomposition of electrolyte at electrode surface to form the SEI films and the irreversible insertion of Na+ into unique pore structure.[38] Figure 5c displays the cycling stability of the BN-CNFs at 100 mA g−1.

Results

Conclusion