High-Rate and Long-Term Cycle Stability of Li-S Batteries Enabled by Li2S/TiO2-Impregnated Hollow Carbon Nanofiber Cathodes

Xinran Wang; Xuanxuan Bi; Shaona Wang; Yi Zhang; Hao Du; Jun Lu

doi:10.1021/acsami.8b03201

High-Rate and Long-Term Cycle Stability of Li-S Batteries Enabled by Li₂S/TiO₂-Impregnated Hollow Carbon Nanofiber Cathodes

Xinran Wang, Xuanxuan Bi, Shaona Wang, Yi Zhang, Hao Du^*, Jun Lu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, Li₂S, as the cathode material, coupled with electrospun TiO₂-impregnated hollow carbon nanofibers (TiO₂-HCFs), which serve as the conductive agent and protective barrier for Li₂S in Li-S batteries. TiO₂-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The Li₂S/TiO₂-HCF composite delivers a discharge capacity of 851 mA h gLi₂S^-1 at 0.1C and the bilayer TiO₂-HCFs/Li₂S/TiO₂-HCF composite delivers a high specific capacity of 400 mA h gLi₂S^-1 at 5C.

Original language	English
Pages (from-to)	16552-16560
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	19
DOIs	https://doi.org/10.1021/acsami.8b03201
Publication status	Published - 16 May 2018
Externally published	Yes

Keywords

carbon nanofiber
high-rate lithium-sulfur batteries
lithium sulfide
lithium sulfide batteries
titanium oxide

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsami.8b03201

Cite this

@article{109b5fb85aed40928fabd865d65027bc,

title = "High-Rate and Long-Term Cycle Stability of Li-S Batteries Enabled by Li2S/TiO2-Impregnated Hollow Carbon Nanofiber Cathodes",

abstract = "The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, Li2S, as the cathode material, coupled with electrospun TiO2-impregnated hollow carbon nanofibers (TiO2-HCFs), which serve as the conductive agent and protective barrier for Li2S in Li-S batteries. TiO2-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The Li2S/TiO2-HCF composite delivers a discharge capacity of 851 mA h gLi2S-1 at 0.1C and the bilayer TiO2-HCFs/Li2S/TiO2-HCF composite delivers a high specific capacity of 400 mA h gLi2S-1 at 5C.",

keywords = "carbon nanofiber, high-rate lithium-sulfur batteries, lithium sulfide, lithium sulfide batteries, titanium oxide",

author = "Xinran Wang and Xuanxuan Bi and Shaona Wang and Yi Zhang and Hao Du and Jun Lu",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = may,

day = "16",

doi = "10.1021/acsami.8b03201",

language = "English",

volume = "10",

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journal = "ACS Applied Materials and Interfaces",

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T1 - High-Rate and Long-Term Cycle Stability of Li-S Batteries Enabled by Li2S/TiO2-Impregnated Hollow Carbon Nanofiber Cathodes

AU - Wang, Xinran

AU - Bi, Xuanxuan

AU - Wang, Shaona

AU - Zhang, Yi

AU - Du, Hao

AU - Lu, Jun

PY - 2018/5/16

Y1 - 2018/5/16

N2 - The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, Li2S, as the cathode material, coupled with electrospun TiO2-impregnated hollow carbon nanofibers (TiO2-HCFs), which serve as the conductive agent and protective barrier for Li2S in Li-S batteries. TiO2-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The Li2S/TiO2-HCF composite delivers a discharge capacity of 851 mA h gLi2S-1 at 0.1C and the bilayer TiO2-HCFs/Li2S/TiO2-HCF composite delivers a high specific capacity of 400 mA h gLi2S-1 at 5C.

AB - The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, Li2S, as the cathode material, coupled with electrospun TiO2-impregnated hollow carbon nanofibers (TiO2-HCFs), which serve as the conductive agent and protective barrier for Li2S in Li-S batteries. TiO2-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The Li2S/TiO2-HCF composite delivers a discharge capacity of 851 mA h gLi2S-1 at 0.1C and the bilayer TiO2-HCFs/Li2S/TiO2-HCF composite delivers a high specific capacity of 400 mA h gLi2S-1 at 5C.

KW - carbon nanofiber

KW - high-rate lithium-sulfur batteries

KW - lithium sulfide

KW - lithium sulfide batteries

KW - titanium oxide

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