The TiO2-Modified Separator Improving the Electrochemical Performance of Lithium-Sulfur Battery

2021 ◽  
Vol 105 (1) ◽  
pp. 183-189
Author(s):  
Marketa Zukalova ◽  
Monika Vinarcikova ◽  
Barbora Pitna Laskova ◽  
Ladislav Kavan
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Electrochemical Performance ◽  
Specific Capacity ◽  
Composite Cathode ◽  
Sulfur Cathode ◽  
Charge Capacity ◽  
Sulfur Battery ◽  
Lithium Sulfur ◽  
Modified Separator

Electrochemical performance of activated carbon/sulfur composite cathode in the Li-S cell with standard and TiO2-modified separator is evaluated by cyclic voltammetry and galvanostatic chronopotentiometry. The modification of the separator by TiO2 impregnation has beneficial effect on the charge capacity of the activated carbon/sulfur cathode in the Li-S cell. The specific capacity of the cathode in the cell with TiO2-modified separator is 632 mAh g-1 (calculated from cyclic voltammetry) and 673 mAh g-1 (determined from galvanostatic chronopotentiometry). Facile impregnation of the separator with nanocrystalline TiO2 results in the 10-20 % stable increase of the charge capacity of corresponding activated carbon/sulfur cathode as compared to its electrochemical performance in the system with non-modified separator.

scholarly journals Nanocrystalline TiO2/Carbon/Sulfur Composite Cathodes for Lithium–Sulfur Battery

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 541
Author(s):  
Markéta Zukalová ◽  
Monika Vinarčíková ◽  
Milan Bouša ◽  
Ladislav Kavan
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Electrochemical Performance ◽  
Nanocrystalline Tio2 ◽  
Charge Capacity ◽  
Modified Activated Carbon ◽  
Composite Cathodes ◽  
Sulfur Battery ◽  
Positive Effect ◽  
Lithium Sulfur

This paper evaluates the influence of the morphology, surface area, and surface modification of carbonaceous additives on the performance of the corresponding cathode in a lithium–sulfur battery. The structure of sulfur composite cathodes with mesoporous carbon, activated carbon, and electrochemical carbon is studied by X-ray diffraction, nitrogen adsorption measurements, and Raman spectroscopy. The sulfur cathode containing electrochemical carbon with the specific surface area of 1606.6 m2 g−1 exhibits the best electrochemical performance and provides a charge capacity of almost 650 mAh g−1 in cyclic voltammetry at a 0.1 mV s−1 scan rate and up to 1300 mAh g−1 in galvanostatic chronopotentiometry at a 0.1 C rate. This excellent electrochemical behavior is ascribed to the high dispersity of electrochemical carbon, enabling a perfect encapsulation of sulfur. The surface modification of carbonaceous additives by TiO2 has a positive effect on the electrochemical performance of sulfur composites with mesoporous and activated carbons, but it causes a loss of dispersity and a consequent decrease of the charge capacity of the sulfur composite with electrochemical carbon. The composite of sulfur with TiO2-modified activated carbon exhibited the charge capacity of 393 mAh g−1 in cyclic voltammetry and up to 493 mAh g−1 in galvanostatic chronopotentiometry. The presence of an additional Sigracell carbon felt interlayer further improves the electrochemical performance of cells with activated carbon, electrochemical carbon, and nanocrystalline TiO2-modified activated carbon. This positive effect is most pronounced in the case of activated carbon modified by nanocrystalline TiO2. However, it is not boosted by additional coverage by TiO2 or SnO2, which is probably due to the blocking of pores.

Improving the electrochemical performance of a lithium–sulfur battery with a conductive polymer-coated sulfur cathode

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44160-44164 ◽  
Author(s):  
Yanrong Li ◽  
Lixia Yuan ◽  
Zhen Li ◽  
Yizi Qi ◽  
Chao Wu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Conductive Polymer ◽  
Significant Enhancement ◽  
Sulfur Cathode ◽  
Capacity Retention ◽  
Lithium Sulfur Battery ◽  
Sulfur Battery ◽  
Sulfur Electrode ◽  
Lithium Sulfur

A pristine sulfur electrode with simple PEDOT:PSS coating achieves significant enhancement in both sulfur utilization and capacity retention.

Oxidized multiwall carbon nanotube modified separator for high performance lithium–sulfur batteries with high sulfur loading

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89972-89978 ◽  
Author(s):  
Xing Cheng ◽  
Weikun Wang ◽  
Anbang Wang ◽  
Keguo Yuan ◽  
Zhaoqing Jin ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Performance ◽  
High Performance ◽  
Multiwall Carbon Nanotube ◽  
Lithium Sulfur Batteries ◽  
Sulfur Battery ◽  
Multiwall Carbon ◽  
Lithium Sulfur ◽  
High Sulfur Loading ◽  
Modified Separator

An oxidized multiwall carbon nanotube (o-MWCNT) coating (0.4 mg cm−2) for improving the electrochemical performance of lithium–sulfur battery with sulfur loading of 5.0 mg cm−2 ​has been presented.

scholarly journals Preparation and Electrochemical Performance of V2O5 @N-CNT/S Composite Cathode Materials

2021 ◽  
Vol 8 ◽  
Author(s):  
Cheng Liu ◽  
Meng Xiang ◽  
Haiyang Zhang ◽  
Shuaiqiang Feng ◽  
Jianrong Xiao ◽  
...  
Keyword(s):  
Composite Material ◽  
Electrochemical Performance ◽  
Active Sites ◽  
Composite Cathode ◽  
High Energy ◽  
Positive Electrode ◽  
High Energy Density ◽  
Lithium Sulfur Battery ◽  
Sulfur Battery ◽  
Lithium Sulfur

Lithium–sulfur battery hasreceived widespread attention because of its high energy density, low cost, environmental friendliness, and nontoxicity. However, the insulating properties of elemental sulfur, huge volume changes, and dissolution of polysulfides in electrolytes that result in the shuttle effect, low sulfur utilization, and low rate performance seriously hinder the commercialization of lithium–sulfur batteries. In this work, a composite material of nitrogen-doped multiwalled carbon nanotubes and V2O5 was designed and fabricated to serve as the positive electrode of lithium–sulfur battery via the hydrothermal method. The positive electrode of the V2O5@N-CNTs composite material could reach an initial discharge specific capacity of 1,453 mAh g−1at a rate of 0.1C. Moreover, the composite material could maintain a discharge ratio of 538 mAh g−1 at a rate of 0.5C even after 200 charge and discharge cycles. After 400 cycles, the composite had a specific discharge capacity of 439 mAh g−1 at a rate of 1.0C. The excellent electrochemical performance of the V2O5@N-CNT/S composite cathode material was due to the fact that V2O5 contains oxygen ions and has a strong polarized surface. Furthermore, nitrogen doping changed the hybrid structure of carbon atoms and provided additional active sites, thereby improving the conductivity of the material itself and effectively inhibiting the dissolution and diffusion of polysulfides.

The facile synthesis and enhanced lithium–sulfur battery performance of an amorphous cobalt boride (Co2B)@graphene composite cathode

2018 ◽  
Vol 6 (47) ◽  
pp. 24045-24049 ◽  
Author(s):  
Bin Guan ◽  
LiShuang Fan ◽  
Xian Wu ◽  
Pengxiang Wang ◽  
Yue Qiu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Specific Capacity ◽  
Composite Cathode ◽  
Cycling Performance ◽  
Facile Synthesis ◽  
Graphene Composite ◽  
Cobalt Boride ◽  
Sulfur Host ◽  
Sulfur Battery ◽  
Lithium Sulfur

The facile synthesis of (Co2B)@graphene as a novel sulfur host, which provides good specific capacity and cycling performance, endowed by the unique “synergistic effect” of Co and B.

Safer lithium–sulfur battery based on nonflammable electrolyte with sulfur composite cathode

2018 ◽  
Vol 54 (33) ◽  
pp. 4132-4135 ◽  
Author(s):  
Huijun Yang ◽  
Qinyu Li ◽  
Cheng Guo ◽  
Ahmad Naveed ◽  
Jun Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Composite Cathode ◽  
Triethyl Phosphate ◽  
Lithium Sulfur Battery ◽  
Sulfur Battery ◽  
Lithium Sulfur ◽  
Nonflammable Electrolyte

Nonflammable solvent triethyl phosphate (TEP) is firstly used as co-solvent in Li–S batteries to satisfy the demand for safety and electrochemical performance.

scholarly journals A Novel Hierarchically Porous Polypyrrole Sphere Modified Separator for Lithium-Sulfur Batteries

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1344 ◽  
Author(s):  
Baoe Li ◽  
Zhenghao Sun ◽  
Yan Zhao ◽  
Zhumabay Bakenov
Keyword(s):  
High Capacity ◽  
Reversible Capacity ◽  
Sulfur Cathode ◽  
Hierarchically Porous ◽  
Shuttle Effect ◽  
Excellent Electrochemical Performance ◽  
Lithium Sulfur Batteries ◽  
Sulfur Battery ◽  
Lithium Sulfur ◽  
Modified Separator

The commercialization of Lithium-sulfur batteries was limited by the polysulfide shuttle effect, and modifying the routine separator was an effective method to solve this problem. In this work, a novel hierarchically porous polypyrrole sphere (PPS) was successfully prepared by using silica as hard-templates. As-prepared PPS was slurry-coated on the separator, which could reduce the polarization phenomenon of the sulfur cathode, and efficiently immobilize polysulfides. As expected, high sulfur utilization was achieved by suppressing the shuttle effect. When tested in the lithium-sulfur battery, it exhibited a high capacity of 855 mAh·g−1 after 100 cycles at 0.2 C, and delivered a reversible capacity of 507 mAh·g−1 at 3 C, showing excellent electrochemical performance.

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