• Title/Summary/Keyword: Polymer electrolyte

Search Result 998, Processing Time 0.027 seconds

Optimization Study on Polymerization of Crosslink-type Gel Polymer Electrolyte for Lithium-ion Polymer Battery (리튬이온폴리머전지용 가교형 겔폴리머전해질의 중합조건 최적화 연구)

  • Kim, Hyun-Soo;Moon, Seong-In;Kim, Sang-Pil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.18 no.1
    • /
    • pp.68-74
    • /
    • 2005
  • In this work, polymerization conditions of the gel polymer electrolyte (GPE) were studied to obtain better electrochemical performances in a lithium-ion polymer battery. When the polymerization temperature and time of the GPE were 70$^{\circ}C$ and 70 min, respectively, the lithium polymer battery showed excellent a rate capability and cycleability. The TMPETA (trimethylolpropane ethoxylate triacrylate)/TEGDMA (triethylene glycol dimethacrylate)-based cells prepared under optimized polymerization conditions showed excellent rate capability and low-temperature performances: The discharge capacity of cells at 2 Crate showed 92.1 % against 0.2C rate. The cell at -20 $^{\circ}C$ also delivered 82.4 % of the discharge capacity at room temperature.

Polymer Electrolyte Membranes for Flexible Electrochromic Device (플렉시블 전기변색 소자를 위한 고분자 전해질 멤브레인)

  • Lee, Ji-Hyeon;Kang, Moon-Sung
    • Membrane Journal
    • /
    • v.30 no.5
    • /
    • pp.333-341
    • /
    • 2020
  • In this study, the optimum design conditions of a polymer electrolyte membrane for application to a flexible electrochromic device (ECD) were tried to be derived. Polyvinyl butyral (PVB) with excellent adhesive property and transparency was selected as the base polymer for the preparation of the electrolyte membrane, and adipate-based polymer was used as the plasticizer. As a result, it was confirmed that the most influential factors on the ECD performance were the ionic conductivity and permeability of the electrolyte membrane. In addition, it was found that the factor has a close relationship with the dissociation property of the lithium salt. Overall, the optimal ECD performance was achieved when LiTFSI salt having a large anion size among various lithium salts was dissolved in a content of about 25 wt.%.

Electrochemical Performance of High-Voltage LiMn0.8Fe0.2PO4 Cathode with Polyacrylonitrile (PAN)-Based Gel Polymer Electrolyte

  • Kwon, O. Hyeon;Kim, Jae-Kwang
    • Korean Chemical Engineering Research
    • /
    • v.57 no.4
    • /
    • pp.547-552
    • /
    • 2019
  • Electrochemical properties of $LiMn_{0.8}Fe_{0.2}PO_4$ cathode were investigated with gel polymer electrolyte (GPE). To access fast and efficient transport of ions and electrons during the charge/discharge process, a pure and well-crystallized $LiMn_{0.8}Fe_{0.2}PO_4$ cathode material was directly synthesized via spray-pyrolysis method. For high operation voltage, polyacrylonitrile (PAN)-based gel polymer electrolyte was then prepared by electrospinning process. The gel polymer electrolyte showed high ionic conductivity of $2.9{\times}10^{-3}S\;cm^{-1}$ at $25^{\circ}C$ and good electrochemical stability. $Li/GEP/LiMn_{0.8}Fe_{0.2}PO_4$ cell delivered a discharge capacity of $159mAh\;g^{-1}$ at 0.1 C rate that was close to the theoretical value ($170mAh\;g^{-1}$). The cell allows stable cycle performance (99.3% capacity retention) with discharge capacity of $133.5mAh\;g^{-1}$ for over 300 cycles at 1 C rate and exhibits high rate-capability. PAN-based gel polymer is a suitable electrolyte for application in $LiMn_{0.8}Fe_{0.2}PO_4/Li$ batteries with perspective in high energy density and safety.

A Study on the Change of Mechanical Property According to the Aging of Polymer Electrolyte Membrane (고분자전해질막의 노후화에 따른 기계적 특성 변화에 관한 연구)

  • KIM, SEUNGHWAN;EO, JUNWOO;SEO, YOUNGJIN;HWANG, CHULMIN;JUNG, YOUNGGUAN
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.33 no.2
    • /
    • pp.176-182
    • /
    • 2022
  • Since the various characteristics of the polymer electrolyte membrane are not clearly identified, it is difficult to predict and design applications for various conditions. In this study, as a previous study on the aging of the polymer electrolyte membrane, a study was conducted on the change of mechanical properties according to the aging of the polymer electrolyte membrane. Through the tensile test of Nafion 117, the mechanical properties change due to aging was confirmed. As a result of the tensile test, it was confirmed that the aged Nafion 117 had reduced tensile strength. Through DSC measurement, aged Nafion confirmed that the glass transition temperature and enthalpy change were low, which is thought to be the effect of molecular motion and transition due to the lapse of time. The effect is thought to cause a difference in the amount of change in enthalpy, resulting in a difference in mechanical properties during tension.

An ionic liquid incorporated gel polymer electrolyte for double layer capacitors

  • Perera, Kumudu S.;Prasadini, K.W.;Vidanapathirana, Kamal P.
    • Advances in Energy Research
    • /
    • v.7 no.1
    • /
    • pp.21-34
    • /
    • 2020
  • Energy storage devices have received a keen interest throughout the world due to high power consumption. A large number of research activities are being conducted on electrochemical double layer capacitors (EDLCs) because of their high power density and higher energy density. In the present study, an EDLC was fabricated using natural graphite based electrodes and ionic liquid (IL) based gel polymer electrolyte (GPE). The IL based GPE was prepared using the IL, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (1E3MITF) with the polymer poly(vinyl chloride) (PVC) and the salt magnesium trifluoromethanesulfonate (Mg(CF3SO3)2 - MgTF). GPE was characterized by electrochemical impedance spectroscopy (EIS), DC polarization test, linear sweep voltammetry (LSV) test and cyclic voltammetry (CV) test. The maximum room temperature conductivity of the sample was 1.64 × 10-4 Scm-1. The electrolyte was purely an ionic conductor and the anionic contribution was prominent. Fabricated EDLC was characterized by EIS, CV and galvanostatic charge discharge (GCD) tests. CV test of the EDLC exhibits a single electrode specific capacitance of 1.44 Fg-1 initially and GCD test gives 0.83 Fg-1 as initial single electrode specific discharge capacitance. Moreover, a good stability was observed for prolonged cycling and the device can be used for applications with further modifications.

Semi-interpenetrated Polymer Network of Sulfonated Poly(Styrene-Divinylbenzene-Acrylonitrile) based on PVC Film for Polymer Electrolyte Membranes

  • Yun, Sung-Hyun;Woo, Jung-Je;Seo, Seok-Jun;Park, Jung-Woo;Oh, Se-Hun;Moon, Seung-Hyeon
    • Korean Membrane Journal
    • /
    • v.11 no.1
    • /
    • pp.8-14
    • /
    • 2009
  • The sulfonated poly(styrene-divinylbenzene-acrylonitrile) (ST-DVB-AN) composite polymer electrolyte membrane based on the original PVC film was successfully synthesized to improve oxidative stability using semi-interpenetrated polymer network (semi-IPN). Weight gain ratio after copolymerization was enhanced by the DVB and AN contents, and the sulfonated membranes were characterized in terms of proton conductivity (k), ion exchange capacity (IEC), and water uptake ($W_U$). The effect of DVB content and AN addition were thoroughly investigated by comparing the resulted properties including oxidative stability. The obtained ST-DVB-AN composited semi-IPN membranes showed relatively high proton conductivity and IEC compared with Nafion117, and greatly improved oxidative stability of the synthesized membrane was obtained. This study demonstrated that a semi-interpenetrated sulfonated ST-DVB-AN composited membrane reinforced by PVC polymer network is a promising candidate as an inexpensive polymer electrolyte membrane for fuel cell applications.

A Study on Advanced Lithium-Ion Battery with Polyurethane-Based Gel Polymer Electrolyte (Polyurethane기 겔폴리머전해질을 이용한 Advanced Lithium-Ion Battery에 관한 연구)

  • 김현수;문성인;윤문수;김상필
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2002.07a
    • /
    • pp.252-254
    • /
    • 2002
  • In this study, polyurethane acrylate macromer was synthesized and it was used in a gel polymer electrolyte, and then its electrochemical performances were evaluated. LiCoO$_2$/GPE/MCF cells were also prepared and their performances depending on discharge currents and temperatures were evaluated. ionic conductivity of the gel polymer electrolyte with PUA at room temperature and -20$^{\circ}C$ was ca. 4.5 x 10$\^$-3/ S/cm and 1.7${\times}$10$\^$-3/ S/cm, respectively. GPE was stable electrochemically up to 4.5 V vs. Li/Li$\^$+/. LiCoO$_2$/GPE/MCF cell showed a good high-rate and a low-temperature performance.

  • PDF

Novel P(VDF-TrFE) Polymer Electrolytes: Their Use in High-Efficiency, All-Solid-State Electrochemical Capacitors Using ZnO Nanowires

  • Park, Young Jun;Bae, Joonho
    • Journal of Electrochemical Science and Technology
    • /
    • v.9 no.2
    • /
    • pp.126-132
    • /
    • 2018
  • For the first time, an innovative approach using P(VDF-TrFE) as a polymer electrolyte for high efficiency, all-solid-state supercapacitors is presented. The polymer electrolyte was successfully achieved by dissolving P(VDF-TrFE) copolymers in dimethylformamide (DMF). Thermal analysis and infrared spectroscopy revealed excellent thermal stability up to $400^{\circ}C$ and copolymer's interaction with DMF. Electrochemical capacitors fabricated using P(VDF-TrFE) in DMF and ZnO NWs demonstrated high capacitive performance. Furthermore, the gel electrolyte-based supercapacitors demonstrated excellent mechanical durability up to a bend angle of $120^{\circ}$. Novel P(VDF-TrFE) electrolytes could be a promising approach for applications in flexible, fabric-based, and high-efficiency energy devices.

Fabrication of Hydrocarbon Polymer Electrolyte Composite Membrane Incorporated with Pt Nanopartle for PEMFC and Its Characteristics (Pt 나노 입자가 도입된 연료전지용 탄화수소계 고분자 전해질 복합막의 제조 및 특성)

  • LEE, HONGKI
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.28 no.3
    • /
    • pp.246-251
    • /
    • 2017
  • To fabricate a hydrocarbon polymer electrolyte composite membrane incorporated with Pt nanoparticle, the polymer electrolyte membrane made of a sulfonated-fluorinated hydrophilic-hydrophobic block copolymer (SFBC) and sulfonated poly (ether ether ketone) (SPEEK) blend in the wight ratio of 1 : 1 was synthesized, and a simple drying process was used in order to incorporate Pt nanoparticle into the SFBC/SPEEK film by reducing platinum (II) bis (acetylacetonate), Pt $(acac)_2$. The distribution of the Pt nanoparticles was observed by transmission electron microscopy (TEM), and mechanical and thermal properties were tested by universal testing machine (UTM) and thermogravimetry analyzer (TGA). Cation conductivity, ion exchange capacity (IEC) and I-V characteristics were estimated.

A Study on Urethane-Based Gel Polymer Electrolyte for Lithium ion Battery (리튬이온전지용 Urethane기 겔폴리머전해질에 관한 연구)

  • 김현수;김성일;최관영;문성인;김상필
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.15 no.12
    • /
    • pp.1033-1038
    • /
    • 2002
  • In this study, urethane acrylate macromer was synthesized and it was used in a gel polymer electrolyte (GPE), and then its electrochemical performances were evaluated. LiCoO$_2$/GPE/graphite cells were Prepared and their performances depending on discharge currents and temperatures were evaluated. The precursor consisting of urethane acrylate (UA), hexanediol dimethacrylate (HDDA) and benzoyl peroxide (BPO) had a low viscosity relatively ionic conductivity of the gel polymer electrolyte with UA at room temperature and -20$\^{C}$ was ca. 4.5 $\times$ 10$\^$-3/S$.$cm$\^$-1/ and 1.7 x 10$\^$-3/ S$.$cm$\^$-1/, respectively GPR was stable electrochemically up to potential of 4.i V vs. Li/Li$\^$+/. LiCoO$_2$/GPE/graphite cells showed good a high-rate and a low-temperature performance.