Porous TiO2−x with oxygen deficiency as sulfur host for lithium–sulfur batteries

2021 ◽  
pp. 2143004
Author(s):  
Yuman Yang ◽  
Yi Zhang ◽  
Meng Yang ◽  
Xiangyu Zhao
Keyword(s):  
Oxygen Deficiency ◽  
Reversible Capacity ◽  
Polar Compounds ◽  
High Specific Surface Area ◽  
Chemical Adsorption ◽  
Sulfur Species ◽  
Host Materials ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur

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.

Hydrothermal synthesis of porous TiO2 microspheres as an efficient sulfur host for enhanced lithium–sulfur batteries

2020 ◽  
Vol 10 (10) ◽  
pp. 1692-1696
Author(s):  
Haishen Song ◽  
Qiujuan Kuang ◽  
Hailiang Yuan ◽  
Hezhang Chen ◽  
Guorong Xu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Coulombic Efficiency ◽  
Chemical Adsorption ◽  
Capacity Loss ◽  
Effective Contact ◽  
Excellent Electrochemical Performance ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Tio2 Microspheres ◽  
Lithium Sulfur

A porous TiO2 particle is synthesized and used as a sulfur host. The obtained TiO2 material provides a large number of pores that can accommodate sulfur, and the porous structure also enables effective contact between the host material and lithium polysulfides. The TiO2/S electrode shows excellent electrochemical performance, exhibiting a capacity loss of 0.17% per cycle and a Coulombic efficiency of 97.7% during cycling at 0.5 C. The appealing results are due to the porous characteristics of the TiO2 material and the chemical adsorption between the TiO2 and lithium polysulfides.

Multifunctional NiCo2O4 nanosheet-assembled hollow nanoflowers as a highly efficient sulfur host for lithium–sulfur batteries

2020 ◽  
Vol 49 (20) ◽  
pp. 6876-6883 ◽  
Author(s):  
Zhe Cui ◽  
Shu-Ang He ◽  
Qian Liu ◽  
Rujia Zou
Keyword(s):  
Catalytic Activity ◽  
Electrochemical Performance ◽  
Chemical Adsorption ◽  
Highly Efficient ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur

A facile method is reported to synthesize NCOHF/S for Li–S battery, exhibiting superior electrochemical performance due to its efficient bifunction catalytic activity, chemical adsorption and excellent conductivity.

Improving the capacity of lithium–sulfur batteries by tailoring the polysulfide adsorption efficiency of hierarchical oxygen/nitrogen-functionalized carbon host materials

2017 ◽  
Vol 19 (12) ◽  
pp. 8349-8355 ◽  
Author(s):  
Artur Schneider ◽  
Jürgen Janek ◽  
Torsten Brezesinski
Keyword(s):  
Adsorption Capacity ◽  
Reversible Capacity ◽  
Adsorption Efficiency ◽  
Host Materials ◽  
Lithium Polysulfide ◽  
Lithium Sulfur Batteries ◽  
Hierarchical Carbon ◽  
Lithium Sulfur

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.

Ultrahigh Nitrogen-Doped Hollow Carbon Spheres with Hierarchical Pores for High-Reversibility Lithium-Sulfur Batteries

2021 ◽  
Author(s):  
Qingkai Zeng ◽  
Xiaolan Li ◽  
Jinliang Zhu ◽  
Guifang Wang ◽  
Xiyong Chen ◽  
...  
Keyword(s):  
Structural Design ◽  
Carbon Materials ◽  
High Specific Surface Area ◽  
Carbon Spheres ◽  
Hierarchical Pores ◽  
Host Materials ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres ◽  
Lithium Sulfur

Carbon materials are widely used as cathode host materials for lithium sulfur batteries due to their high specific surface area and high conductivity. Rational structural design can improve the sulfur...

MgCo layered double hydroxide-based yolk shell polyhedrons as multifunctional sulfur mediator for lithium-sulfur batteries

2021 ◽  
Author(s):  
Kai Zhang ◽  
You Li ◽  
Hongyu Wang ◽  
Zisheng Zhang ◽  
Guihua Liu ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
High Discharge ◽  
Shuttle Effect ◽  
High Discharge Capacity ◽  
Host Materials ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Double Hydroxide ◽  
Areal Capacity ◽  
Lithium Sulfur

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.

Enhancing the performance of lithium–sulfur batteries by anchoring polar polymers on the surface of sulfur host materials

2016 ◽  
Vol 4 (41) ◽  
pp. 16148-16156 ◽  
Author(s):  
Manfang Chen ◽  
Xianyou Wang ◽  
Siyu Cai ◽  
Zhongyun Ma ◽  
Peng Song ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Carbon Materials ◽  
Polar Polymers ◽  
Host Materials ◽  
Excellent Electrochemical Performance ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Triton X ◽  
Lithium Sulfur ◽  
Polar Polymer

Through anchoring polar polymer Triton X-100 on carbon materials, the MAC/S manifests excellent electrochemical performance as the cathode for Li–S batteries.

A graphene-like metallic cathode host for long-life and high-loading lithium–sulfur batteries

2016 ◽  
Vol 3 (2) ◽  
pp. 130-136 ◽  
Author(s):  
Quan Pang ◽  
Dipan Kundu ◽  
Linda F. Nazar
Keyword(s):  
High Performance ◽  
Electronic Conductivity ◽  
High Loading ◽  
Host Materials ◽  
High Electronic Conductivity ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Long Life ◽  
Lithium Sulfur

Nanostructured sulfur host materials that embrace both high electronic conductivity and strong chemisorption towards polysulfides are central to enable high performance Li–S batteries.

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