Synergy between partially exfoliated carbon nanotubes-sulfur cathode and nitrogen rich dual function interlayer for high performance lithium sulfur battery

Garapati, Meenakshi Seshadhri; S., Ajay Piriya V.; Ramaprabhu, Sundara

doi:10.1016/j.carbon.2019.03.007

Cited by 29 publications

(15 citation statements)

References 46 publications

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“…Besides, the voltage polarization value (▵ E ) is measured between the linear regions of the charge‐discharge curve. A smaller value of ▵ E implies better ion transportation [55] . The Δ E value for S@CNTs/HNC‐800 electrode is found to be markedly smaller than S@HNC‐800 electrode, which signifies the presence of a faster lithium ions transport and substantially reduced electrochemical polarization in S@CNTs/HNC‐800 electrode, as compared with the control electrode S@HNC‐800 [56,57] .…”

Section: Resultsmentioning

confidence: 86%

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

et al. 2020

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Effectively confining lithium polysulfides inside porous material matrix with a high electrical conductivity represents a judicious way to extend lifespan and enhance rate performance of lithium‐sulfur (Li‐S) batteries. Herein, nitrogen‐doped hollow carbon polyhedrons with a thin CNTs conductive surface layer (CNTs/HNC) were prepared by directly pyrolyzing the CNTs coated ZIF‐8 polyhedrons crystallite precursors, and subsequently served as sulfur hosts in Li‐S batteries. The resulted product CNTs/HNC‐800 comprises a nitrogen content of 4.94 at.% as well as a high electrical conductivity of 8.43×10−1 S cm−1, which help to effectively adsorb/confine lithium polysulfides and substantially improve the rate capacity of Li‐S batteries. With a sulfur loading of 1.60 mg cm−2, the S@CNTs/HNC based cathode shows a discharge capacity of 870.7 mAh g−1 at 1.0 C, and can maintain 76.4 % of its initial capacity after 500 charge‐discharge cycles, corresponding to a capacity fade rate of only 0.047 % per cycle. While with a higher sulfur loading of 2.46 mg cm−2, a discharge capacity of 649.7 mAh g−1 can be achieved at 0.5 C, along with a capacity fade rate of merely 0.044 % per cycle during 200 cycles. When sulfur loading is further increased to 5.39 mg cm−2, it can also maintain a considerable initial discharge capacity of 812 mAh g−1 at 0.1 C. This work enriches the ways to prepare complicate nano structured sulfur hosts for long‐life and high‐rate Li‐S batteries.

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Section: Resultsmentioning

confidence: 86%

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

et al. 2020

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“…The length of the diffusion is minimum around 2.36 V due to the formation of higher-order LPS. 40 , 41 …”

Section: Resultsmentioning

confidence: 99%

Synergy between Interconnected Porous Carbon-Sulfur Cathode and Metallic MgB₂ Interlayer as a Lithium Polysulfide Immobilizer for High-Performance Lithium-Sulfur Batteries

Garapati

2020

ACS Omega

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Lithium-sulfur (Li-S) batteries are the potential candidates for developing high-energy-density electric vehicles. However, poor electrical conductivity of sulfur/discharged products, low active material utilization, shuttle mechanism, and poor cycle life remain the major challenges for the development of Li-S batteries. Herein, we report the nitrogen-doped highly porous carbon (NC) with interconnected pores as the sulfur host (NC-S), which is synthesized by a facile one-step process without using any template and activation agents. The highly interconnected porous structure of NC can accommodate a high amount of sulfur loading and provide space for sulfur volume expansion during redox reactions. Besides, to mitigate the lithium polysulfide dissolution and shuttle mechanism, metallic and polar magnesium diboride (MgB 2 ) is used as an interlayer. Consequently, the NC-S/MgB 2 cathode delivers higher specific capacity, rate capability, and excellent cyclic stability than the NC-S cathode and bulk sulfur cathode with MgB 2 interlayer. The lithium polysulfide (LPS) adsorption test shows that MgB 2 has strong chemisorption toward lithium polysulfides, which can inhibit the dissolution of LPS into the electrolyte and minimizes the shuttle effect. The dynamic electrochemical impedance spectroscopy analysis investigates the electrochemical reaction kinetics of the NC-S/MgB 2 cathode during the charging and discharging processes. Overall, this work demonstrates that the synergy between the nitrogen-doped porous carbon-sulfur host and polar metallic MgB 2 improves the performance of the Li-S battery, which is beneficial for the development of high-energy-density batteries for the future.

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“…For example, to deal with the shuttling effect in sulfur cathode, many studies have focused on developing various porous carbon‐based sulfur host materials that offers physical/chemical trapping interaction for lithium polysulfides (LiPS). [ 10–15 ] An emerging strategy is to develop sulfur hosts with electrocatalytic features, which aims to accelerate the LiPS conversion kinetics to suppress the polysulfide shuttling behaviors. [ 16–28 ] For the Li dendrites problem, many strategies have also been proposed, including modifying liquid electrolytes to stabilize the Li/electrolyte interface, [ 29 ] developing solid electrolyte interphase (SEI) or designing a Li plating that favors uniform Li growth.…”

Section: Introductionmentioning

confidence: 99%

All‐Purpose Electrode Design of Flexible Conductive Scaffold toward High‐Performance Li–S Batteries

Zhang

et al. 2020

Adv Funct Materials

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The main obstacles that hinder the development of efficient lithium sulfur (Li-S) batteries are the polysulfide shuttling effect in sulfur cathode and the uncontrollable growth of dendritic Li in the anode. An all-purpose flexible electrode that can be used both in sulfur cathode and Li metal anode is reported, and its application in wearable and portable storage electronic devices is demonstrated. The flexible electrode consists of a bimetallic CoNi nanoparticle-embedded porous conductive scaffold with multiple Co/Ni-N active sites (CoNi@PNCFs). Both experimental and theoretical analysis show that, when used as the cathode, the CoNi and Co/Ni-N active sites implanted on the porous CoNi@PNCFs significantly promote chemical immobilization toward soluble lithium polysulfides and their rapid conversion into insoluble Li 2 S, and therefore effectively mitigates the polysulfide shuttling effect. Additionally, a 3D matrix constructed with porous carbonous skeleton and multiple active centers successfully induces homogenous Li growth, realizing a dendrite-free Li metal anode. A Li-S battery assembled with S/CoNi@PNCFs cathode and Li/CoNi@PNCFs anode exhibits a high reversible specific capacity of 785 mAh g −1 and long cycle performance at 5 C (capacity fading rate of 0.016% over 1500 cycles).

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Synergy between partially exfoliated carbon nanotubes-sulfur cathode and nitrogen rich dual function interlayer for high performance lithium sulfur battery

Cited by 29 publications

References 46 publications

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Synergy between Interconnected Porous Carbon-Sulfur Cathode and Metallic MgB₂ Interlayer as a Lithium Polysulfide Immobilizer for High-Performance Lithium-Sulfur Batteries

All‐Purpose Electrode Design of Flexible Conductive Scaffold toward High‐Performance Li–S Batteries

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Synergy between partially exfoliated carbon nanotubes-sulfur cathode and nitrogen rich dual function interlayer for high performance lithium sulfur battery

Cited by 29 publications

References 46 publications

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Synergy between Interconnected Porous Carbon-Sulfur Cathode and Metallic MgB2 Interlayer as a Lithium Polysulfide Immobilizer for High-Performance Lithium-Sulfur Batteries

All‐Purpose Electrode Design of Flexible Conductive Scaffold toward High‐Performance Li–S Batteries

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Synergy between Interconnected Porous Carbon-Sulfur Cathode and Metallic MgB₂ Interlayer as a Lithium Polysulfide Immobilizer for High-Performance Lithium-Sulfur Batteries