scholarly journals Hierarchical Porous Graphene Bubbles as Host Materials for Advanced Lithium Sulfur Battery Cathode

2021 ◽  
Vol 9 ◽  
Author(s):  
Wenjie Han ◽  
Qing Li ◽  
Hua Zhu ◽  
Dan Luo ◽  
Xianying Qin ◽  
...  

The serious shuttle effect, low conductivity, and large volume expansion have been regarded as persistent obstacles for lithium sulfur (Li-S) batteries in its practical application. Carbon materials, such as graphene, are considered as promising cathode hosts to alleviate those critical defects and be possibly coupled with other reinforcement methods to further improve the battery performance. However, the open structure of graphene and the weak interaction with sulfur species restrict its further development for hosting sulfur. Herein, a rational geometrical design of hierarchical porous graphene-like bubbles (PGBs) as a cathode host of the Li-S system was prepared by employing magnesium oxide (MgO) nanoparticles as templates for carbonization, potassium hydroxide (KOH) as activation agent, and car tal pitch as a carbon source. The synthesized PGBs owns a very thin carbon layer around 5 nm that can be comparable to graphite nanosheets. Its high content of mesoporous and interconnected curved structure can effectively entrap sulfur species and impose restrictions on their diffusion and shuttle effect, leading to a much stable electrochemical performance. The reversible capacity of PGBs@S 0.3 C still can be maintained at 831 mAh g−1 after 100 cycles and 512 mAh g−1 after 500 cycles.

2021 ◽  
pp. 2143004
Author(s):  
Yuman Yang ◽  
Yi Zhang ◽  
Meng Yang ◽  
Xiangyu Zhao

The dissolution and shuttle behavior of lithium polysulfides has been considered to be one of the serious problems restricting the development of lithium−sulfur (Li–S) batteries. Polar compounds are regarded as promising sulfur host materials due to their strong chemical adsorption to lithium polysulfides. Herein, polar TiO[Formula: see text] with porous structure is employed as the sulfur host, which has a high specific surface area and provides nanoconfined space for storage and adsorption of sulfur species. As a result, the as-prepared S@TiO[Formula: see text] cathode exhibits significantly enhanced reversible capacity, cycling stability, and reaction kinetics compared to those of the as-prepared S@TiO2 cathode.


2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Hongdong Liu ◽  
Ye Lin ◽  
Lei Zhang

Abstract To overcome the deficiency of the volume expansion of MoS2 as the anode material for lithium-ion batteries (LIBs), an effective strategy was developed to design hierarchical porous MoS2/carbon nanospheres via a facile, easy-operated hydrothermal method followed by annealing. FESEM and TEM images clearly showed that nanospheres are composed of ultra-thin MoS2/C nanosheets coated with carbon layer and possess an expanded interlayer spacing of 0.98 nm. As anodes for LIBs, MoS2/carbon nanospheres deliver an initial discharge capacity of 1307.77 mAh g−1 at a current density of 0.1 A g−1. Moreover, a reversible capacity of 612 mAh g−1 was obtained even at 2 A g−1 and a capacity retention of 439 mAh g−1 after 500 cycles at 1 A g−1. The improved electrochemical performance is ascribed to the hierarchical porous structure as well as the intercalation of carbon into lattice spacing of MoS2, which offers fast channels for ion/electron transport, relieves the influence of volume change and increases electrical conductivity of electrode. Meanwhile, the expanded interlayer spacing of MoS2 in MoS2/C can decrease the ion diffusion resistance and alleviate the volumetric expansion during discharge/charge cycles.


2015 ◽  
Vol 26 (4) ◽  
pp. 577-585 ◽  
Author(s):  
Cheng Tang ◽  
Bo-Quan Li ◽  
Qiang Zhang ◽  
Lin Zhu ◽  
Hao-Fan Wang ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80353-80356 ◽  
Author(s):  
Wangliang Wu ◽  
Chunying Wan ◽  
Chuxin Wu ◽  
Lunhui Guan

3D hierarchical porous graphene laminates through self-assembly of functionalized graphene oxide embedded with SiO2in situas a carbon host material for sulfur cathode, exhibits high reversible capacity, stable cycling performance as well as excellent rate capabilities.


2016 ◽  
Vol 8 (25) ◽  
pp. 16101-16107 ◽  
Author(s):  
Naiqiang Liu ◽  
Bicheng Huang ◽  
Weikun Wang ◽  
Hongyuan Shao ◽  
Chengming Li ◽  
...  

2017 ◽  
Vol 19 (12) ◽  
pp. 8349-8355 ◽  
Author(s):  
Artur Schneider ◽  
Jürgen Janek ◽  
Torsten Brezesinski

O/N-functionalization of hierarchical carbon is demonstrated to be effective in enhancing the adsorption capacity for lithium polysulfide and thus the reversible capacity of Li–S cells.


2021 ◽  
Author(s):  
Kai Zhang ◽  
You Li ◽  
Hongyu Wang ◽  
Zisheng Zhang ◽  
Guihua Liu ◽  
...  

Abstract The development of efficient sulfur host materials to address the shuttle effect issues of lithium polysulfides (LiPSs) is crucial in the lithium-sulfur (Li-S) batteries, but still challenging. In the present study, a novel yolk shell structured MgCo-LDH/ZIF-67 composite is designed as Li-S battery cathode. In this composite, the shell layer is MgCo layered double hydroxide constructed by partially etching ZIF-67 nanoparticle by Mg2+, and the core is the unreacted ZIF-67 particle. The unique yolk shell structure not only provides abundant pores for sulfur accommodation, but also facilitates the electrolyte penetration and ion transport. The ZIF-67 core exhibits strong polar adsorption to LiPSs through the Lewis acid-base interactions, and the micropores/mesoporous can further trap LiPSs. Meanwhile, the MgCo-LDH shell exposes enough sulfur-philic sites for enhancing chemisorption and catalyzes the LiPSs conversion. As a result, when MgCo-LDH/ZIF-67 is used as sulfur host in the cathode, the cell achieves a high discharge capacity of 1121 mAh g-1 at 0.2 C, and an areal capacity of 5.0 mAh cm-2 under the high sulfur loading of 5.8 mg cm-2. The S/MgCo-LDH/ZIF-67 electrode holds a promising potential for the development of Li-S batteries.


Nano Energy ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 314-321 ◽  
Author(s):  
Jia-Qi Huang ◽  
Xiao-Fei Liu ◽  
Qiang Zhang ◽  
Cheng-Meng Chen ◽  
Meng-Qiang Zhao ◽  
...  

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