A conductive and ordered macroporous structure design of titanium oxide-based catalytic cathode for lithium-sulfur batteries

2021 ◽  
Author(s):  
Fan Liu ◽  
Yani Guan ◽  
Xiaohang Du ◽  
Guihua Liu ◽  
Daolai Sun ◽  
...  
Keyword(s):  
Active Site ◽  
Structure Design ◽  
Doped Tio2 ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Ordered Macroporous ◽  
Kinetics Of ◽  
Areal Capacity ◽  
Lithium Sulfur ◽  
High Sulfur Loading

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.

Nitrogen doped porous carbon fiber/vertical graphene as efficient polysulfide conversion catalyst for high performance lithium sulfur batteries

2021 ◽  
Author(s):  
junsheng lin ◽  
Yangcheng Mo ◽  
Shiwen Li ◽  
Jie Yu
Keyword(s):  
High Performance ◽  
Practical Application ◽  
Nitrogen Doped ◽  
High Sulfur Content ◽  
Slow Kinetics ◽  
Lithium Sulfur Batteries ◽  
Conversion Catalyst ◽  
Kinetics Of ◽  
Lithium Sulfur ◽  
High Sulfur Loading

Under high sulfur loading, high sulfur content and low electrolyte/sulfur ratio (E/S), the practical application of lithium sulfur (Li–S) batteries is seriously limited by the negative and slow kinetics of...

Rational integration of spatial confinement and polysulfide conversion catalysts for high sulfur loading lithium–sulfur batteries

2020 ◽  
Vol 5 (4) ◽  
pp. 720-729 ◽  
Author(s):  
Qingfei Zhang ◽  
Zhensong Qiao ◽  
Xinrui Cao ◽  
Baihua Qu ◽  
Jin Yuan ◽  
...  
Keyword(s):  
Electron Transport ◽  
Reaction Kinetics ◽  
Spatial Confinement ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Lithium Sulfur ◽  
High Sulfur Loading

A Co/N–PCNF@S cathode, formed via spatial confinement with a polar catalyst in a freestanding sulfur host, facilitates infiltration of electrolyte and electron transport, fixes LIPSs through strong chemisorption and catalyzes the reaction kinetics.

scholarly journals Three-Dimensionally Ordered Macroporous ZnO Framework as Dual-Functional Sulfur Host for High-Efficiency Lithium–Sulfur Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2267
Author(s):  
Haisheng Han ◽  
Tong Wang ◽  
Yongguang Zhang ◽  
Arailym Nurpeissova ◽  
Zhumabay Bakenov
Keyword(s):  
High Efficiency ◽  
High Capacity ◽  
Active Surface ◽  
Active Surface Area ◽  
Shuttle Effect ◽  
Dual Functional ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Ordered Macroporous ◽  
Lithium Sulfur

A three-dimensionally ordered macroporous ZnO (3DOM ZnO) framework was synthesized by a template method to serve as a sulfur host for lithium–sulfur batteries. The unique 3DOM structure along with an increased active surface area promotes faster and better electrolyte penetration accelerating ion/mass transfer. Moreover, ZnO as a polar metal oxide has a strong adsorption capacity for polysulfides, which makes the 3DOM ZnO framework an ideal immobilization agent and catalyst to inhibit the polysulfides shuttle effect and promote the redox reactions kinetics. As a result of the stated advantages, the S/3DOM ZnO composite delivered a high initial capacity of 1110 mAh g−1 and maintained a capacity of 991 mAh g−1 after 100 cycles at 0.2 C as a cathode in a lithium–sulfur battery. Even at a high C-rate of 3 C, the S/3DOM ZnO composite still provided a high capacity of 651 mAh g−1, as well as a high areal capacity (4.47 mAh cm−2) under high loading (5 mg cm−2).

scholarly journals Free-standing and binder-free highly N-doped carbon/sulfur cathodes with tailorable loading for high-areal-capacity lithium–sulfur batteries

2015 ◽  
Vol 3 (41) ◽  
pp. 20482-20486 ◽  
Author(s):  
A. Schneider ◽  
C. Suchomski ◽  
H. Sommer ◽  
J. Janek ◽  
T. Brezesinski
Keyword(s):  
High Loading ◽  
Carbon Paper ◽  
Free Standing ◽  
Lithium Sulfur Batteries ◽  
Binder Free ◽  
Sulfur Host ◽  
Sulfur Cathodes ◽  
Areal Capacity ◽  
Lithium Sulfur

A practical high-loading Li–S battery is realized by using free-standing and highly conductive N-doped carbon paper as sulfur host.

scholarly journals Electroconductive Additives for High-Rate Capability of High-Areal-Capacity Lithium–Sulfur Batteries Using Metal-Foam Current Collector

2019 ◽  
Author(s):  
Hiroki Nara ◽  
Tokihiko Yokoshima ◽  
Hitoshi Mikuriya ◽  
Shingo Tsuda ◽  
Tetsuya Osaka
Keyword(s):  
Energy Density ◽  
Aluminum Foam ◽  
Metal Foam ◽  
Rate Capability ◽  
Current Collector ◽  
High Rate ◽  
Lithium Sulfur Batteries ◽  
Areal Capacity ◽  
Lithium Sulfur ◽  
High Sulfur Loading

Various types of electroconductive additives were evaluated for high C-rate capability in an attempt to extend practical application of high-areal-capacity lithium–sulfur batteries that employ an aluminum-foam current collector. Carbon nanofibers (CNFs) were found to be the most effective additive, with the ability to attain a high-sulfur-loading of 40 mg cm−2. A CNF-containing cell exhibited gravimetric capacities of 1094 and 758 mAh gsulfur−1 (46.8 and 32.4 mAh cm−2) at 0.05 and 0.1 C-rate, respectively, in an ether-based electrolyte. Because a CNF-containing slurry exhibits low viscosity even at a high solid ratio, it could be filled into the aluminum foam. Additionally, a lithium–sulfur battery with high-sulfur-loading had an energy density of ~120 Wh kg−1, a value that was calculated from the weight of the components of the cathode, anode, current collectors, electrolyte, and separator. Assuming that the amount of electrolyte decreases and that the energy density of cells accumulate, a theoretical energy density of 522 Wh kg−1 was estimated. Moreover, it was found that even if a high-areal-capacity was achieved, the discharge capacity converged at a high C-rate, unless there was an improvement in ion diffusion in the bulk electrolyte. This is considered a limitation of sulfur cathodes with high-sulfur-loading.

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.

Multifunctional vanadium nitride@N-doped carbon composites for kinetically enhanced lithium–sulfur batteries

2018 ◽  
Vol 42 (7) ◽  
pp. 5109-5116 ◽  
Author(s):  
Lin Zhu ◽  
Chuanchuan Li ◽  
Wenjiao Ren ◽  
Mingyang Qin ◽  
Liqiang Xu
Keyword(s):  
Carbon Composite ◽  
Vanadium Nitride ◽  
Carbon Composites ◽  
Electrochemical Performances ◽  
Redox Kinetics ◽  
Lithium Sulfur Batteries ◽  
Sulfur Host ◽  
Kinetics Of ◽  
Lithium Sulfur

VN@N-doped carbon composite was fabricated as sulfur host to enhance the redox kinetics of Li–S batteries, which displayed remarkable electrochemical performances.

scholarly journals Highly flexible, freestanding tandem sulfur cathodes for foldable Li–S batteries with a high areal capacity

2017 ◽  
Vol 4 (2) ◽  
pp. 249-258 ◽  
Author(s):  
Chi-Hao Chang ◽  
Sheng-Heng Chung ◽  
Arumugam Manthiram
Keyword(s):  
Lithium Sulfur Batteries ◽  
Sulfur Cathodes ◽  
Areal Capacity ◽  
Lithium Sulfur ◽  
High Sulfur Loading

Highly flexible tandem cathodes with a high sulfur loading achieve foldable lithium–sulfur batteries with a high areal capacity.

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