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Implanting a preferential solid electrolyte interphase layer over anode electrode of lithium ion batteries for highly enhanced li^+ diffusion properties

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Journal of Energy Chemistry 2020年第9期29卷 285-292,I0009页

作者： Ye Kyu Kim Yoongon Kim Jaejin Bae Hyunwoo Ahn Yuseong Noh Hyunsu Han Won Bae Kim Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Nam-gu 37673PohangSouth Korea

The lithium-ion batteries are recognized as the most promising energy storage system,but it still does not meet the power requirements of electric vehicle batteries owing to low volumetric energy density with the traditional graphite electrode system.In this study,we report the development of a novel electrode system fabricated by implantation of a solid electrolyte interphase(SEI)layer on the graphite surface.The SEI-implanted graphite electrode is made using a lithium bis(trifluoromethanesulfonyl)imide(liTFSI)-based electrolyte and cycled with a lithium tetrafluoroborate liBF4-based electrolyte.This new electrode system shows significantly enhanced electrochemical properties owing to the rapid and efficient diffusion of li ions through the SEI layer between the electrolyte and electrode.This graphite electrode with its pre-formed SEI layer achieves a reversible capacity of 357 mAh g^-1 at 0.5 C after 50 cycles,which is significantly higher than that of commercial lithium-ion battery systems constructed with liPF6(312mAh g^-1).The resulting unique electrode system could present a new avenue in SEI research for highperformance lithium-ion batteries.

关键词： SEI layer Graphite Implanting li ion diffusion liTFSI liBF4 Artificial Mobility

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Suitable lithium polysulfides diffusion and adsorption on CNTs@TiO_(2)-bronze nanosheets surface for high-performance lithium-sulfur batteries

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Nano Research 2022年第2期15卷 933-941页

作者： Mengmeng Zhen Keliang Jiang Sheng-Qi Guo Boxiong Shen Huiling liu Tianjin Key Laboratory of Clean Energy and Pollution Control School of Energy and Environmental EngineeringHebei University oj TechnologyTianjin 300401China Tianjin Key Laboratory of Advanced Functional Porous Materials and Center for Electron Microscopy Institute for New Energy Materials&Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300071China

The shuttle effect of lithium polysulfides(UPSs)in lithium-sulfur batteries(LSBs)has been hampered their commercialization.Metal oxides as separator modifications can suppress the shuttle effect.Since there is no direct electron transport between metal oxides and UPSs,absorbed UPSs should be diffused from the surface of metal oxides to the carbon matrix to go through redox reactions.If diffusivity of UPSs from metal oxides surface to carbon substrate is poor,it would hinder the redox reactions of liPSs.Nevertheless,researchers tend to focus on the adsorption and overlook the diffusion of UPSs.Herein,same morphology and different crystal phase of TiO_(2) nanosheets grown on carbon nanotubes(CNTs@TiO_(2)-bronze and CNTs@TiO_(2)-anatase)have been designed via a simple approach.Compared with CNTs and CNTs@TiO_(2)-anatase composites,the battery with CNTs@TiO_(2)-bronze modified separator delivers higher specific capacities and stronger cycling stability,especially at high current rates(~472 mAh·g^(-1) at 2.0 C after 1,000 cycles).Adsorption tests,density functional theory calculations and electrochemical performance evaluations indicate that suitable diffusion and adsorption for liPSs on the CNTs@TiO_(2)-B surface can effectively capture liPSs and promote the redox reaction,leading to the superior cycling performances.

关键词： lithium polysulfides li ion diffusion adsorption TiO_(2)-bronze surface long-term cycling performances

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