Uniform Coverage of High-loading Sulfur on Cross-linked Carbon Nanofiber for High Reaction Kinetics in the Li-S Batteries with Low Electrolyte/Sulfur Ratio

2022 ◽  
Author(s):  
Wenhao Wu ◽  
Xiying Li ◽  
Liangliang Liu ◽  
Xuebing Zhu ◽  
Zhijie Guo ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Carbon Nanofiber ◽  
High Loading ◽  
Low Carbon ◽  
Shuttle Effect ◽  
Uniform Coverage ◽  
High Reaction ◽  
Host Materials

The aggregation of high loading sulfur on host materials at low carbon/sulfur (C/S) ratio results in the limited S↔Li2S reaction kinetics and shuttle effect of polysulfide, which is the bottleneck...

scholarly journals Understanding Sulfur Redox Mechanisms in Different Electrolytes for Room-Temperature Na–S Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Hanwen Liu ◽  
Wei-Hong Lai ◽  
Qiuran Yang ◽  
Yaojie Lei ◽  
Can Wu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Surface ◽  
Reversible Capacity ◽  
High Loading ◽  
Side Reactions ◽  
Liquid Sulfur ◽  
Shuttle Effect ◽  
Loading Ratio ◽  
Solid Liquid ◽  
Sulfur Cathodes

Abstract This work reports influence of two different electrolytes, carbonate ester and ether electrolytes, on the sulfur redox reactions in room-temperature Na–S batteries. Two sulfur cathodes with different S loading ratio and status are investigated. A sulfur-rich composite with most sulfur dispersed on the surface of a carbon host can realize a high loading ratio (72% S). In contrast, a confined sulfur sample can encapsulate S into the pores of the carbon host with a low loading ratio (44% S). In carbonate ester electrolyte, only the sulfur trapped in porous structures is active via ‘solid–solid’ behavior during cycling. The S cathode with high surface sulfur shows poor reversible capacity because of the severe side reactions between the surface polysulfides and the carbonate ester solvents. To improve the capacity of the sulfur-rich cathode, ether electrolyte with NaNO3 additive is explored to realize a ‘solid–liquid’ sulfur redox process and confine the shuttle effect of the dissolved polysulfides. As a result, the sulfur-rich cathode achieved high reversible capacity (483 mAh g−1), corresponding to a specific energy of 362 Wh kg−1 after 200 cycles, shedding light on the use of ether electrolyte for high-loading sulfur cathode.

scholarly journals Hierarchical Porous, N-Containing Carbon Supports for High Loading Sulfur Cathodes

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 408
Author(s):  
Jae-Woo Park ◽  
Hyun Jin Hwang ◽  
Hui-Ju Kang ◽  
Gazi A. K. M. Rafiqul Bari ◽  
Tae-Gyu Lee ◽  
...  
Keyword(s):  
High Energy ◽  
High Energy Density ◽  
High Loading ◽  
Carbon Supports ◽  
Structure Directing Agent ◽  
Shuttle Effect ◽  
Main Challenge ◽  
Hierarchical Porous ◽  
Hollow Carbon ◽  
A Minor

The lithium-polysulfide (LiPS) dissolution from the cathode to the organic electrolyte is the main challenge for high-energy-density lithium-sulfur batteries (LSBs). Herein, we present a multi-functional porous carbon, melamine cyanurate (MCA)-glucose-derived carbon (MGC), with superior porosity, electrical conductivity, and polysulfide affinity as an efficient sulfur support to mitigate the shuttle effect. MGC is prepared via a reactive templating approach, wherein the organic MCA crystals are utilized as the pore-/micro-structure-directing agent and nitrogen source. The homogeneous coating of spherical MCA crystal particles with glucose followed by carbonization at 600 °C leads to the formation of hierarchical porous hollow carbon spheres with abundant pyridinic N-functional groups without losing their microstructural ordering. Moreover, MGC enables facile penetration and intensive anchoring of LiPS, especially under high loading sulfur conditions. Consequently, the MGC cathode exhibited a high areal capacity of 5.79 mAh cm−2 at 1 mA cm−2 and high loading sulfur of 6.0 mg cm−2 with a minor capacity decay rate of 0.18% per cycle for 100 cycles.

Fast Polysulfides Catalytic Conversion and Self-Repairing Ability for High Loading Lithium-Sulfur Batteries using a Permselective Coating Layer Modified Separator

Nanoscale ◽  
2021 ◽  
Author(s):  
Fanglei Zeng ◽  
Fang Wang ◽  
Ning Li ◽  
Ke Meng Song ◽  
Shi-Ye Chang ◽  
...  
Keyword(s):  
Energy Density ◽  
Coating Layer ◽  
High Energy ◽  
High Energy Density ◽  
High Loading ◽  
Battery System ◽  
Shuttle Effect ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur ◽  
Modified Separator

Li-S battery is considered as one of the most promising battery system because of its large theoretical capacity and high energy density. However, the “shuttle effect” of soluble polysulfides and...

Al centre-powered graphitic nanozyme with high catalytic efficiency for pH-independent chemodynamic therapy of cancer

2020 ◽  
Vol 56 (46) ◽  
pp. 6285-6288 ◽  
Author(s):  
Jun Li ◽  
Ke Yi ◽  
Yanli Lei ◽  
Zhihe Qing ◽  
Zhen Zou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cancer Therapy ◽  
Reaction Kinetics ◽  
Catalytic Efficiency ◽  
High Reaction

In this work, an Al centre-powered graphitic nanozyme (Fe/Al-GNE) was developed for chemodynamic cancer therapy, which afforded pH-independent catalytic activity and high reaction kinetics.

Promoting polysulfide conversion by catalytic separator with LiNiPO4 and rGO hybrids for high performance Li–S batteries

2020 ◽  
Vol 8 (38) ◽  
pp. 20111-20121
Author(s):  
Yinze Zuo ◽  
Yuejin Zhu ◽  
Qi Wang ◽  
Kezhong Lv ◽  
Weiming Su ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reaction Kinetics ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Coating Layer ◽  
Nano Particles ◽  
Functional Coating ◽  
Shuttle Effect ◽  
Reduced Graphene ◽  
Novel Strategy

A novel strategy for suppressing the “shuttle effect” of LiPSs and facilitating reaction kinetics is achieved using the reduced graphene oxide (rGO) with incorporated polar LiNiPO4 (LNPO) nano-particles as functional coating layer for separator.

Simultaneously Enhancing Redox Kinetics and Inhibiting the Polysulfides Shuttle Effect by MOF-derived CoSe Hollow Sphere Structures for Advanced Li-S Batteries

Nanoscale ◽  
2021 ◽  
Author(s):  
Shunyou Hu ◽  
Yuanyuan Hu ◽  
X. L. Liu ◽  
Jiaheng Zhang
Keyword(s):  
Reaction Kinetics ◽  
Hollow Sphere ◽  
Redox Reaction ◽  
Active Components ◽  
Shuttle Effect ◽  
Redox Kinetics ◽  
Lithium Sulfur

Lithium-sulfur (Li-S) batteries generally suffer from a serious “shuttle effect” during the charging/discharging process, resulting in the loss of active components and sluggish redox reaction kinetics that hinder the cycle...

Electrochemical properties of oxygenated cup-stacked carbon nanofiber-modified electrodes

2014 ◽  
Vol 16 (24) ◽  
pp. 12209-12213 ◽  
Author(s):  
Seongjae Ko ◽  
Tetsu Tatsuma ◽  
Akiyoshi Sakoda ◽  
Yasuyuki Sakai ◽  
Kikuo Komori
Keyword(s):  
Electrochemical Properties ◽  
Reaction Kinetics ◽  
Carbon Nanofiber ◽  
Electrochemical Reaction ◽  
Modified Electrodes ◽  
Atomic Ratio ◽  
Kinetics Of

The electrochemical reaction kinetics of Fe2+/3+ and [Fe(CN)6]3−/4− is tunable by controlling the oxygen/carbon atomic ratio at the CSCNF surface.

scholarly journals 3-D Edge-Oriented Electrocatalytic NiCo2S4 Nanoflakes on Vertical Graphene for Li-S Batteries

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wenyue Li ◽  
Shiqi Li ◽  
Ayrton A. Bernussi ◽  
Zhaoyang Fan
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Carbon Nanofiber ◽  
Coulombic Efficiency ◽  
Small Mass ◽  
Performance Measurements ◽  
Free Standing ◽  
Shuttle Effect ◽  
Catalytic Function ◽  
Polysulfide Shuttle

Polysulfide shuttle effect, causing extremely low Coulombic efficiency and cycling stability, is one of the toughest challenges hindering the development of practical lithium sulfur batteries (LSBs). Introducing catalytic nanostructures to stabilize the otherwise soluble polysulfides and promote their conversion to solids has been proved to be an effective strategy in attacking this problem, but the heavy mass of catalysts often results in a low specific energy of the whole electrode. Herein, by designing and synthesizing a free-standing edge-oriented NiCo2S4/vertical graphene functionalized carbon nanofiber (NCS/EOG/CNF) thin film as a catalytic overlayer incorporated in the sulfur cathode, the polysulfide shuttle effect is largely alleviated, revealed by the enhanced electrochemical performance measurements and the catalytic function demonstration. Different from other reports, the NiCo2S4 nanosheets synthesized here have a 3-D edge-oriented structure with fully exposed edges and easily accessible in-plane surfaces, thus providing a high density of active sites even with a small mass. The EOG/CNF scaffold further renders the high conductivity in the catalytic structure. Combined, this novel structure, with high sulfur loading and high sulfur fraction, leads to high-performance sulfur cathodes toward a practical LSB technology.

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