MoS 2 self-embedded in pleated carbon pyrolyzed by ionic liquids as a high-performance anode materials for lithium-/sodi
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MoS2 self-embedded in pleated carbon pyrolyzed by ionic liquids as a high-performance anode materials for lithium-/sodium-ion batteries Hongshuai Zhang1, Yanshuang Meng1,3, Qianru Hu1, Guixiang Zhao1, Fuliang Zhu1,3,* Yue Zhang2,*
, and
1
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China Department of Manufacturing Engineering, Georgia Southern University, Statesboro, GA 30458, USA 3 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou 730050, China 2
Received: 9 April 2020
ABSTRACT
Accepted: 27 August 2020
MoS2 is a promising anode with high theoretical capacity in lithium-/sodiumion batteries. Nevertheless, the unstable structure and poor conductivity of MoS2 limit its practical applications. Herein, a carbon layer-coated MoS2 composite (MoS2/C) is synthesized by a pyrolysis strategy, in which ionic liquidderived carbon improves the conductivity and structural stability of composites by wrapping MoS2. When MoS2/C composite is used as anode in lithium-/sodium-ion batteries, it exhibits excellent stability, high capacity and long cycle life. After 50 cycles at 100 mA g-1, the lithium storage capacity of the MoS2/C composite is more than 760 mAh g-1, and the sodium storage capacity reaches 480 mAh g-1. When the current density is 2 A g-1, the sodium storage capacity maintains at 355 mAh g-1 after 500 cycles. Even after 1000 cycles, it still exhibits a stable lithium storage capacity of 350 mAh g-1 at the current density of 4 A g-1. The improved performance of MoS2/C composite can be explained by its stable structure and high charge mobility.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Resources shortage and environmental pollution provide opportunity for the rapid development of power source conversion and storage equipment [1–4]. Specifically, lithium-ion batteries (LIBs) arouse widely concerned and rapidly developing due to their many advantages: no memory effect, voltage stability, long cycle life, lower self-discharge, and
environmental friendliness [5, 6]. Therefore, from portable devices to large industrial products, LIBs have been playing an important role in our daily life. Recently, owing to the limitation of lithium reserve and plenty sources of sodium, sodium-ion batteries (SIBs) were considered as promising alternatives to LIBs. Unfortunately, the radius of Na? is 0.106 nm, which is almost 1.4 times of the radius of Li?. This not only causes a large damage on the electrode
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https://doi.org/10.1007/s10854-020-04369-5
J Mater Sci: Mater Electron
structure, but also reduces the degree of kinetic diffusion, leading to unstable cycle performance and low reversible capacity [7]. Therefore, it is necessary to find a suitable electrode material for the SIBs. Although many breakthroughs of SIBs have been made in recent years, the development of SIBs is still slower than that of LIBs [2, 8]. Therefo
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