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A Self-Healing and nonflammable Cross-Linked Network Polymer Electrolyte with the Combination of Hydrogen Bonds and Dynamic Disulfide Bonds for Lithium Metal Batteries

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Energy & Environmental Materials 2023年第4期6卷 106-113页

作者： Kai Chen Yuxue Sun Xiaorong Zhang Jun Liu Haiming Xie Department of Chemistry National&Local United Engineering Laboratory for Power BatteryNortheast Normal UniversityChangchun 130024China

The self-healing solid polymer electrolytes(SHSPEs)can spontaneously eliminate mechanical damages or micro-cracks generated during the assembly or operation of lithium-ion batteries(LIBs),significantly improving cycling performance and extending service life of LIBs.Here,we report a novel cross-linked network SHSPE(PDDP)containing hydrogen bonds and dynamic disulfide bonds with excellent self-healing properties and nonflammability.The combination of hydrogen bonding between urea groups and the metathesis reaction of dynamic disulfide bonds endows PDDP with rapid self-healing capacity at 28°C without external stimulation.Furthermore,the addition of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(EMIMTFSI)improves the ionic conductivity(1.13×10^(−4)S cm^(−1)at 28°C)and non-flammability of PDDP.The assembled Li/PDDP/LiFePO_(4)cell exhibits excellent cycling performance with a discharge capacity of 137 mA h g^(−1)after 300 cycles at 0.2 C.More importantly,the self-healed PDDP can recover almost the same ionic conductivity and cycling performance as the original PDDP.

关键词： cross-linked network dynamic disulfide bonds lithium-ion batteries nonflammable self-healing solid polymer electrolytes

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Advanced nonflammable Localized High-Concentration Electrolyte For High Energy Density Lithium Battery

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Energy & Environmental Materials 2022年第4期5卷 1294-1302页

作者： Mengmin Jia Chi Zhang Yawei Guo Linshan Peng Xiaoyan Zhang Weiwei Qian Lan Zhang Suojiang Zhang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringBeijing Key Laboratory of Ionic Liquids Clean ProcessChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China Langfang Institute of Process Engineering Chinese Academy of SciencesHebei 065001China

The key to realize long-life high energy density lithium batteries is to exploit functional electrolytes capable of stabilizing both high voltage cathode and lithium anode.The emergence of localized high-concentration electrolytes(LHCEs)shows great promise for ameliorating the above-mentioned interfacial issues.In this work,a lithium difluoro(oxalate)borate(LiDFOB)based nonflammable dual-anion LHCE is designed and prepared.Dissolving in the mixture of trimethyl phosphate(TMP)/1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether(D_(2)),the continuously consumption of LiDFOB is suppressed by simply introducing lithium nitrate(LiNO_(3)).Meantime,as most of the TMP molecular are coordinated with Li^(+),the electrolyte does not show incompatibility issue between neither metal lithium nor graphite anode.Therefore,it demonstrates excellent capability in stabilizing the interface of Ni-rich cathode and regulating lithium deposition morphology.The Li||LiNi_(0.87)Co_(0.08)Mn_(0.05)O_(2)(NCM87)batteries exhibit high capacity retention of more than 90%after 200 cycles even under the high cutoff voltage of 4.5 V,1 C rate.This study offers a prospective method to develop safe electrolytes suitable for high voltage applications,thus providing higher energy densities.

关键词： dual-anion lithium metal battery localized high-concentration electrolyte nonflammable phosphate

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Safe and Stable Lithium Metal Batteries Enabled by an Amide-Based Electrolyte

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Nano-Micro Letters 2022年第3期14卷 120-133页

作者： Wanbao Wu Yiyang Bo Deping Li Yihong Liang Jichuan Zhang Miaomiao Cao Ruitian Guo Zhenye Zhu Lijie Ci Mingyu Li Jiaheng Zhang Sauvage Laboratory for Smart Materials Harbin Institute of Technology(Shenzhen)Shenzhen 518055People’s Republic of China Research Centre of Printed Flexible Electronics School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055People’s Republic of China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055People’s Republic of China Department of Chemistry University of IdahoMoscowID 83844‑2343USA

The formation of lithium dendrites and the safety hazards arising from flammable liquid electrolytes have seriously hindered the development of high-energy-density lithium metal batteries.Herein,an emerging amide-based electrolyte is proposed,containing LiTFSI and butyrolactam in different molar ratios.1,1,2,2-Tetrafluoroethyl-2,2,3,3-tetrafluoropropylether and fluoroethylene carbonate are introduced into the amide-based electrolyte as counter solvent and additives.The well-designed amide-based electrolyte possesses nonflammability,high ionic conductivity,high thermal stability and electrochemical stability(>4.7 V).Besides,an inorganic/organic-rich solid electrolyte interphase with an abundance of LiF,Li3N and Li-N-C is in situ formed,leading to spherical lithium deposition.The formation mechanism and solvation chemistry of amide-based electrolyte are further inves-tigated by molecular dynamics simulations and density functional theory.When applied in Li metal batteries with LiFePO4 and LiMn2O4 cathode,the amide-based electrolyte can enable stable cycling performance at room temperature and 60℃.This study provides a new insight into the development of amide-based electrolytes for lithium metal batteries.

关键词： Amide-based electrolyte nonflammable Inorganic/organic-rich solid electrolyte interphase Dendrite-free Lithium metal batteries

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High-Energy-Density Foldable Battery Enabled by Zigzag-Like Design

High-Energy-Density Foldable Battery Enabled by Zigzag-Like ...

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中国力学大会（CCTAM2019）

作者： Xiangbiao Liao Changmin Shi Tianyang Wang Boyu Qie Youlong Chen Pengfei Yang Qian Cheng Haowei Zhai Meijie Chen Xue Wang Xi Chen Yuan Yang Yonghong Zhang Family Center for Advanced Materials for Energy and Environment Department of Earth and Environmental Engineering Columbia University Program of Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University School of Aerospace Xi’an Jiaotong University School of Energy Science and Engineering Harbin Institute of Technology School of Astronautics Harbin Institute of Technology

Flexible batteries, seamlessly compatible with flexible and wearable electronics, attract a great deal of research attention. Current designs of flexible batteries struggle to meet one of the most extreme yet common d... 详细信息

关键词： energy density flexible foldable lithium ion batteries nonflammable

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