A high-performance polymer composite electrolyte embedded with ionic liquid for all solid lithium based batteries operating at ambient temperature

You, Duck-Jae,Yin, Zhenxing,Ahn, Yong-keon,Cho, Sanghun,Kim, Hyunjin,Shin, Dalwoo,Yoo, Jeeyoung,Kim, Youn Sang Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-

<P><B>Abstract</B></P> <P>A novel polymer composite electrolyte for lithium-based battery operating at room temperature was introduced. The proposed polymer composite electrolyte consisted of electrolyte using a 3-D cross-linked polymer matrix, which is synthesized with polyethylene glycol (PEG) and 3-glycidoxypropyltrimethoxysilane (GPTMS), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) as a Li-ion transport medium. The proposed polymer composite electrolyte shows a high ionic conductivity of 35×10<SUP>−2</SUP> mScm<SUP>−1</SUP> and high decomposition temperature of 250°C with a 3-D cross-linked polymer matrix. The EMITFSI mass ratio is 1:0.7 at room temperature. In addition, when polymer composite electrolyte is applied to the solid battery consisting of Li metal as an anode and LiFePO<SUB>4</SUB> as a cathode, it can be operated at room temperature with a high specific capacity of 75.8mAh/g at 0.1C rate. Furthermore, the battery with a structure of Li/polymer composite electrolyte/LiFePO<SUB>4</SUB> also has excellent capacity retention.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polymer composite electrolytes were composed with the 3-D cross-linked polymer matrix and EMITFSI. </LI> <LI> The suggested polymer composite electrolyte was thermally stable up to 250°C. </LI> <LI> Ionic conductivity was strongly increased by addition of EMITFSI to polymer composite electrolyte. </LI> <LI> Polymer composite electrolyte achieved a high ionic conductivity of 35×10<SUP>−2</SUP> mScm<SUP>−1</SUP> at room temperature. </LI> <LI> The discharge specific capacity of Li/polymer composite electrolyte/LiFePO<SUB>4</SUB> battery was increased to 75.8mAh/g at room temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P> <P>Polymer composite electrolyte embedding ionic liquid to fabricate the high-performance all-solid-state Li-battery operating at room temperature. The proposed electrolyte shows a high ionic conductivity 35×10<SUP>−2</SUP> mScm<SUP>−1</SUP>. When polymer composite electrolyte is applied to the battery, it can be operated at room temperature.</P>

고분자 전해질 막 연료전지 응용을 위한 고성능 과불소화계 전해질 막 개발 연구 동향

최찬희,황선수,김기현,Choi, Chanhee,Hwang, Seansoo,Kim, Kihyun 한국막학회 2022 멤브레인 Vol.32 No.5

An eco-friendly energy conversion device without the emission of pollutants has gained much attention due to the rapid use of fossil fuels inducing carbon dioxide emissions ever since the first industrial revolution in the 18th century. Polymer electrolyte membrane fuel cells (PEMFCs) that can produce water during the reaction without the emission of carbon dioxide are promising devices for automotive and residential applications. As a key component of PEMFCs, polymer electrolyte membranes (PEMs) need to have high proton conductivity and physicochemical stability during the operation. Currently, perfluorinated sulfonic acid-based PEMs (PFSA-PEMs) have been commercialized and utilized in PEMFC systems. Although the PFSA-PEMs are found to meet these criteria, there is an ongoing need to improve these further, to be useful in practical PEMFC operation. In addition, the well-known drawbacks of PFSA-PEMs including low glass transition temperature and high gas crossover need to be improved. Therefore, this review focused on recent trends in the development of high-performance PFSA-PEMs in three different ways. First, control of the side chain of PFSA copolymers can effectively improve the proton conductivity and thermal stability by increasing the ion exchange capacity and polymer crystallinity. Second, the development of composite-type PFSA-PEMs is an effective way to improve proton conductivity and physical stability by incorporating organic/inorganic additives. Finally, the incorporation of porous substrates is also a promising way to develop a thin pore-filling membrane showing low membrane resistance and outstanding durability.

Enhancing the Ionic Transport of PEO-Based Composite Polymer Electrolyte by Addition of TiO2 Nanofiller for Quasi-Solid State Dye-Sensitized Solar Cells

Tran Thanh Trang,이도경,김재홍 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6

For the application to quasi-solid state dye-sensitized solar cells (QS-DSSCs), we have prepared composite polymer electrolytes with a poly(ethylene oxide) (PEO)-TiO2-LiI-I2 system. Effects of the concentration of TiO2 nanofiller on the electrochemical properties of the PEO-based composite polymer electrolytes have been investigated. The experimental results show that the presence of TiO2 in the PEO-based electrolyte changes the phase of the polymer. Also, the addition of TiO2 noticeably increases the ionic conductivity of the PEO-based electrolytes. At optimized TiO2 concentration of 15 wt%, the composite polymer electrolyte exhibited a maximum value of ionic conductivity, and leads to remarkable enhancement of the photovoltaic performance of the QS-DSSC. This indicates that the incorporation of TiO2 to the PEO-based electrolytes gives rise to the reduction of the crystallinity of the polymer and the enhancement of the mobility of the I - /I3 - redox couple, resulting in the increases of the conductivity and the current density of QS-DSSC.

A high-performance polymer composite electrolyte embedded with ionic liquid for all solid lithium based batteries operating at ambient temperature

유덕재,Zhenxing Yin,안용건,조상훈,김현진,신달우,유지영,김연상 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-

A novel polymer composite electrolyte for lithium-based battery operating at room temperature wasintroduced. The proposed polymer composite electrolyte consisted of electrolyte using a 3-D cross-linkedpolymer matrix, which is synthesized with polyethylene glycol (PEG) and 3-glycidoxypropyltrimethox-ysilane (GPTMS), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) as a Liiontransport medium. The proposed polymer composite electrolyte shows a high ionic conductivity of3510 2mS cm 1 and high decomposition temperature of 250 C with a 3-D cross-linked polymermatrix. The EMITFSI mass ratio is 1:0.7 at room temperature. In addition, when polymer compositeelectrolyte is applied to the solid battery consisting of Li metal as an anode and LiFePO4 as a cathode, it canbe operated at room temperature with a high specific capacity of 75.8 mAh/g at 0.1C rate. Furthermore,the battery with a structure of Li/polymer composite electrolyte/LiFePO4 also has excellent capacityretention.

Cycling Characteristics of Lithium Powder Polymer Batteries Assembled with Composite Gel Polymer Electrolytes and Lithium Powder Anode

Lee, Yoon‐,Sung,Lee, Jae Ha,Choi, Ji‐,Ae,Yoon, Woo Young,Kim, Dong‐,Won WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.8

<P><B>Abstract</B></P><P>Novel composite gel polymer electrolytes exhibiting high ionic conductivity and good mechanical stability are prepared, and their electrochemical properties are characterized. As lithium ion sources of a single ion conductor, the core‐shell structured SiO<SUB>2</SUB>(Li<SUP>+</SUP>) nanoparticles with uniform spherical shape are synthesized and used as functional fillers in the composite gel polymer electrolytes. By using the composite gel polymer electrolytes, the lithium powder polymer batteries composed of a lithium powder anode and a layered lithium vanadate (LiV<SUB>3</SUB>O<SUB>8</SUB>) cathode are assembled and their cycling performance is evaluated. The resulting lithium powder polymer batteries deliver a high discharge capacity of 264 mAh g<SUP>−1</SUP> at room temperature and exhibit good capacity retention even at high current rates. The morphological analysis of the lithium powder anode reveals that the dendrite growth during cycling can be effectively suppressed by using the composite gel polymer electrolytes.</P>

A Flame-Retardant Composite Polymer Electrolyte for Lithium-Ion Polymer Batteries

Kim, Seokwoo,Han, Taeyeong,Jeong, Jiseon,Lee, Hoogil,Ryou, Myung-Hyun,Lee, Yong Min Elsevier 2017 ELECTROCHIMICA ACTA Vol.241 No.-

<P><B>Abstract</B></P> <P>A new composite polymer electrolyte (CPE) containing a flame-retardant material, Mg(OH)<SUB>2</SUB>, is fabricated via a two-step process: porous poly(vinylidene-co-hexafluoropropylene) films composited with different Mg(OH)<SUB>2</SUB> contents are first prepared via casting and extraction steps, and they are then impregnated with a liquid electrolyte. As the Mg(OH)<SUB>2</SUB> content in the CPEs increases, their flame-retardant properties are greatly improved compared to those of the bare polymer electrolyte. Moreover, the better wettability of Mg(OH)<SUB>2</SUB> toward a liquid electrolyte leads to higher ionic conductivities of CPEs, thereby resulting in a better rate capability in LiCoO<SUB>2</SUB>/graphite lithium-ion polymer batteries (LiPBs). However, the Mg(OH)<SUB>2</SUB> content must be limited to less than 40wt% to maintain the mechanical properties of the corresponding CPEs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A flame-retardant gel polymer electrolyte composited with Mg(OH)<SUB>2</SUB> is fabricated. </LI> <LI> Thermal and mechanical properties of porous composite polymer films are analyzed. </LI> <LI> As the Mg(OH)<SUB>2</SUB> content increases, better electrochemical properties are achieved. </LI> <LI> Mg(OH)<SUB>2</SUB> content should be limited to ensure the mechanical property for cell assembly. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

실리카/PEO 핵-껍질형 이온전도체의 합성과 특성

김성배,김정수 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.2

요약: 말단 아미노 그룹을 함유한 폴리(에틸렌 옥시드)[PEO]와 표면에 옥시란 그룹을 가지도록 개질된 실리카 입자와의 결합반응을 통하여 실리카 핵과 PEO 껍질로 구성된 복합입자를 합성하였다. 복합입자의 형성은 FT-IR과 TGA에 의하여 확인하였으며 PEO, 리튬염, 가소제와 혼합되어 복합고분자전해질을 제조하였다. 복합고분자전해질에 있어서 제조된 복합입자의 첨가는 PEO의 결정성을 감소시켜 약간의 리튬이온전도성을 증가시키는 효과를 나타내었다. Polymer composite particles composed of silica core and poly(ethylene oxide)[PEO] shell were prepared by the coupling reaction of silica particles modified by oxiran groups with amino-terminaled PEO. The formation of composite particles was proved by FT-IR and TGA. They were mixed with PEO, lithium salt. and plasticizer to produce a composite polymer electrolyte. The addition of composite polymer particles resulted in a decrease in the crystallinity of PEO and a slight increase in the lithium ion conductivity. Keywords : polymer composite electrolyte, PEO, sllica, ion conductivity

Approaches to Improvement in the Stability of Polymer Electrolyte Membranes

신동원,( Abdul Kodir ),( Juniko Nur Pratama ),신성희,배병찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Polymer electrolyte membrane fuel cell (PEMFC) is an eco-friend energy device. It has high energy efficiency and wide power ranges. Polymer electrolyte membrane (PEM) is one of key components in PEMFC. Electrochemical performance of PEM has been improved, whereas long-term durability of PEM needs to be further improved. There are two kinds of stability issues in PEM. One is chemical stability and the other is mechanical stability. In this study, we investigated the effect of radical scavengers on the chemical stability of PEM, while the mechanical stability of PEM was improved by fabricating reinforced composite membrane. Radical scavengers improved chemical stability of both perfluorosulfonic acid polymers and hydrocarbon-based polymers. In addition, reinforced composite membranes had better mechanical properties than dense membranes.

고분자 전해질 막 연료전지 응용을 위한 탄화수소계 고분자 전해질 막의 물성 향상에 관한 연구동향

김기현,황인혁,최다빈 한국막학회 2022 멤브레인 Vol.32 No.6

고분자 전해질 막 연료전지(polymer electrolyte membrane fuel cell, PEMFC)의 핵심 구성요소 중 하나인 고분자전해질 막(polymer electrolyte membrane, PEM)은 수소이온을 애노드(anode)에서 캐소드(cathode)로 이동시키는 전해질의 역할 및 연료의 투과를 막는 분리막으로서의 역할을 수행하며 PEMFC의 성능 및 효율을 결정짓는 핵심 소재이다. 현재 나피온(Nafion®)으로 대표되는 과불소화계 전해질 막이 높은 수소이온 전도도 및 화학적 안정성으로 인해 상용화 되었지만, 높은 생산비용과 구동 시 환경오염 물질이 배출된다는 문제점을 갖고 있다. 이를 대체할 PEM 소재로써 고분자의 구조 조절 및 개질과정이 용이한 다양한 종류의 탄화수소계 고분자가 제시되고 있지만, 실제 PEMFC에 적용되기 위해서는 성능 및 내구 특성을 개선해야 하는 과제가 남아있다. 이에 본 총설은 탄화수소계 PEM의 성능 및 내구 특성을 향상시키기 위해 1) 가교 구조를 도입한 가교 막 개발, 2) 무기 첨가제 도입을 통한 유⋅무기 복합 막 개발 및 3) 다공성 지지체를 활용한 강화 복합 막을개발하는 연구에 대해 살펴보고자 한다.

폴리에틸렌 이민과 혼합된 PEO 복합체 전해질의 이온 전도도에 미치는 실리카 필러 첨가 효과

김주현 ( Ju Hyun Kim ),김광만 ( Kwang Man Kim ),이영기 ( Young Gi Lee ),정용주 ( Yong Ju Jung ),김석 ( Seok Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4

In this study, poly(ethyleneoxide) and poly(ethylene imine) polymer blends containing fumed silica fillers were studied in order to enhance the ion conductivity and interfacial properties. Lithium perchlorate (LiCIO4) as a salt, and silica(SiO2) as the inorganic filler were introduced into the polymer composite electrolyte composites and the composites were examined to evaluate their ionic conductivity for a possibility test of electrolyte application. As the diameter of semicircle in an impedance test became smaller, ionic conductivity of composite electrolytes had been enhanced by addition of 20 wt% silica filler. However, the conductivity was not greatly changed over 20 wt% content because the silica was sufficiently saturated in the polymer electrolytes. Diffraction peaks of PEO became weaker with the addition of inorganic fillers using XRD analysis. It showed that a crystallinity was proportionally reduced by increasing filler contents. The morphology of composite electrolyte films has been investigated by SEM. The heterogeneous morphology which silica was evenly dispersed by the strong adhesion of PEI was shown at higher contents of silica.