Improved electrochemical performance of Li-S battery via using mesoporous MnO 2 nanofibers to inhibit the polysulfide di
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ORIGINAL PAPER
Improved electrochemical performance of Li-S battery via using mesoporous MnO2 nanofibers to inhibit the polysulfide diffusion Miao Shang 1 & Yongtao Sun 2 Received: 10 May 2020 / Revised: 29 May 2020 / Accepted: 1 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The migration of the soluble polysulfide has become the main obstacle for the application of the Li-S battery for commercialization. Therefore, designing the suitable cathode host materials for the Li-S battery is the main research topic for the researchers worldwide. In our work, mesoporous MnO2 nanofibers are prepared and designed as the host materials for the element sulfur. The as-prepared MnO2/S composite shows much higher specific capacity and superior cycle stability during the electrochemical process. The excellent electrochemical performance is ascribed to the presence of the mesoporous MnO2 nanofibers, which could efficiently inhibit the migration of the soluble polysulfide in the electrolyte. As a result, the as-prepared MnO2/S composites exhibit initial specific capacity of 1502 mAh g−1 at 0.1 C. Besides, the specific capacity value of the MnO2/S electrode is as high as 1205 mAh g−1 after 200 cycles with only capacity retention of 89% at 0.2 C. Keywords Cathode . Polysulfide . Electrochemical performance . Inhibiting
Introduction The high specific capacity value and energy density of the lithium-sulfur battery have made them become the important research topic for the researchers worldwide [1–3]. During the past decades, many great achievements have been obtained about improving the electrochemical performance of the lithium-sulfur batteries [4–6]. These achievements are mostly obtained via designing suitable host materials for the element sulfur [7]. The electrochemical performance of the lithium-sulfur batteries mainly depends on the structure and function of the cathode materials [8, 9]. Therefore, many various cathode materials have been developed, such as carbon-based cathode, polymer-based cathode, and other metal oxide-based cathode. At the beginning of the study on the lithium-sulfur batteries, carbon materials are used as the main host for the element sulfur [10]. For example, Ji et al. firstly used the mesoporous carbon as the perfect host materials for the sulfur [11]. Evidently, the as-
* Miao Shang [email protected] 1
Department of Mechanical and Electrical Technology, Xijing University, Xi’an 710123, China
2
Avic Xi’an Aircraft Industry, Xi’an 710089, China
prepared cathode exhibited more stable cycle performance than the pristine sulfur electrode. Besides, other carbon materials were designed as host materials for high-performance lithium-sulfur batteries [12–15]. With the development of the lithium-sulfur batteries, metal oxides are increasingly emerging as the host material for the element sulfur in the lithium-sulfur batteries. Cui’s group reported yolk-shell TiO2/S composites as the cathode materials for the lithium-sulfur batteries, showing excellent electrochemical
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