areal capacity
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Author(s):  
John A. Lewis ◽  
Chanhee Lee ◽  
Yuhgene Liu ◽  
Sang Yun Han ◽  
Dhruv Prakash ◽  
...  

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Jie Lei ◽  
Xiao-Xiang Fan ◽  
Ting Liu ◽  
Pan Xu ◽  
Qing Hou ◽  
...  

AbstractThe redox reactions occurring in the Li-S battery positive electrode conceal various and critical electrocatalytic processes, which strongly influence the performances of this electrochemical energy storage system. Here, we report the development of a single-dispersed molecular cluster catalyst composite comprising of a polyoxometalate framework ([Co4(PW9O34)2]10−) and multilayer reduced graphene oxide. Due to the interfacial charge transfer and exposure of unsaturated cobalt sites, the composite demonstrates efficient polysulfides adsorption and reduced activation energy for polysulfides conversion, thus serving as a bifunctional electrocatalyst. When tested in full Li-S coin cell configuration, the composite allows for a long-term Li-S battery cycling with a capacity fading of 0.015% per cycle after 1000 cycles at 2 C (i.e., 3.36 A g−1). An areal capacity of 4.55 mAh cm−2 is also achieved with a sulfur loading of 5.6 mg cm−2 and E/S ratio of 4.5 μL mg−1. Moreover, Li-S single-electrode pouch cells tested with the bifunctional electrocatalyst demonstrate a specific capacity of about 800 mAh g−1 at a sulfur loading of 3.6 mg cm−2 for 100 cycles at 0.2 C (i.e., 336 mA g−1) with E/S ratio of 5 μL mg−1.


2022 ◽  
pp. 2103845
Author(s):  
Qianzheng Jin ◽  
Hongfei Lu ◽  
Zili Zhang ◽  
Jing Xu ◽  
Bin Sun ◽  
...  
Keyword(s):  

Nature Energy ◽  
2022 ◽  
Author(s):  
Laidong Zhou ◽  
Tong-Tong Zuo ◽  
Chun Yuen Kwok ◽  
Se Young Kim ◽  
Abdeljalil Assoud ◽  
...  

2021 ◽  
Vol 30 ◽  
pp. e00334
Author(s):  
Zhengwei Wan ◽  
Yingchong Huang ◽  
Xiaomin Zeng ◽  
Xinzhu Guo ◽  
Zhuoying Wu ◽  
...  

2021 ◽  
Author(s):  
Fan Liu ◽  
Yani Guan ◽  
Xiaohang Du ◽  
Guihua Liu ◽  
Daolai Sun ◽  
...  

Abstract The application of lithium-sulfur (Li-S) batteries is hindered by the insulating characteristic of sulfur and slow reaction kinetics of lithium polysulfides. Here, we propose a three-dimensionally ordered macroporous (3DOM) structured conductive polar Ta-doped TiO2 framework with supported Co active site (CoTa@TiO2)to enhance the conversion kinetics of polysulfides. The 3DOM structure serves as an efficient sulfur host for the active sulfur through abundant pores and adsorption site. At the same time, the macropores can buffer the volume expansion of sulfur and enlarged mass transfer. The strong electrostatic attraction between Ti-O bond and polysulfide also promotes the adsorption of polysulfides. Moreover, the doped-Ta improves the conductivity of TiO2 by narrowing the band gap, whereas the supported Co can accelerate the catalytic transformation. Benefited from advanced structural designandsynergistic effect of Co and Ta doped TiO2, the Li-S cell with 3DOM CoTa@TiO2 cathode exhibits an impressive areal capacity of 3.4 mAh cm-2 under a high sulfur loading of 5.1 mg cm-2. This work provides an alternative strategy for the development of carbon-based cathode materials for lithium-sulfur batteries.


2021 ◽  
pp. 134194
Author(s):  
Mustehsin Ali ◽  
Ting Zhao ◽  
Sundas Iqbal ◽  
Wenyu Zhao ◽  
Helin Wang ◽  
...  

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