23August2019

Nano-Micro Letters

Atomic Layer Deposition Assisted Construction of Binder-Free Ni@N-Doped Carbon Nanospheres Films as Advanced Host for Sulfur Cathode

Jun Liu1, *, Aixiang Wei1, 2, Guoxiang Pan3, Qinqin Xiong4, Fang Chen5, Shenghui Shen6, Xinhui Xia6, 7, *

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Nano-Micro Lett. (2019) 11: 64

First Online: 02 August 2019 (Article)

DOI:10.1007/s40820-019-0295-8

*Corresponding author. E-mail: gdutliu@gdut.edu.cn (Jun Liu); helloxxh@zju.edu.cn (Xinhui Xia)

 

Abstract

 


Toc

Rational design of hybrid carbon host with high electrical conductivity and strong adsorption toward soluble lithium polysulfides is the main challenge for achieving high-performance lithium-sulfur batteries (LSBs). Herein, novel binder-free Ni@N-doped carbon nanospheres (N-CNSs) films as sulfur host are firstly synthesized via a facile combined hydrothermal-atomic layer deposition method. The cross-linked multilayer N-CNSs films can effectively enhance the electrical conductivity of electrode and provide physical blocking “dams” toward the soluble long chain polysulfides. Moreover, the doped N heteroatoms and superficial NiO layer on Ni layer can work synergistically to suppress the shuttle of lithium polysulfides by effective chemical interaction/adsorption. In virtue of the unique composite architecture and reinforced dual physical & chemical adsorption to the soluble polysulfides, the obtained Ni@N-CNSs/S electrode is demonstrated with enhanced rate performance (816 mAh g-1 at 2 C) and excellent long cycling life (87% after 200 cycles at 0.1 C), much better than N-CNSs/S electrode and other carbon/S counterparts. Our proposed design strategy offers a promising prospect for construction of advanced sulfur cathodes for applications in LSBs and other energy storage systems. 


 

Keywords

Atomic layer deposition; Nickel; N-doped carbon nanospheres; Sulfur cathode; Lithium-sulfur batteries

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