http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Solid Lithium ion Battery with Poly(ethylene glycol)-grafted Graphene Oxide Composite Electrolyte
궁찬영,심지민,백지훈,정다운,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Conventional liquid electrolyte based lithium-ion battery systems have safety issues like leak, explosion etc. In order to solve the above problems, a solid lithium-ion battery system is essential. This study shows a composite electrolyte for this reason. Solid-state composite electrolytes consist of a PEGMA and MA-POSS copolymer matrix with poly (ethylene glycol) graft graphene oxide filler. The filler 0.2 wt% had significantly higher ionic conductivity of the matrix electrolyte than the matrix without the filler. The Lewis acid-base interactions that create dissociation of lithium salts contained in the matrix can explain the superiority. In addition, the composite electrolyte electrolyte showed a fairly stable cycle performance compared to the matrix without the filler because the ion-conductive paths were made by implementing the filler.
Novel Polymer Binder Which Have Both Ionic and Electronic Conductivity for Lithium-ion Battery
궁찬영,김나경,정다운,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
polymeric binder having both ionic conductivity and electronic conductivity originated from PEG moiety and Thiophene moiety respectively was synthesized successfully. PEG moiety with low Tg value makes it possible to have the ionic conductivity of 3.7 × 10-5S/cm at 30oC and quite sufficient electronic conductivity of 8.7 × 10-8S/cm at room temperature. Moreover, thermal stability of the polymer was investigated by DSC, EIS analysis techniques. The cell test with cathode including the polymer binder showed high discharge capacity and stable cycle performance compared to the one with conventional PVdF binder. We expect the polymer binder having both ionic and electronic conductivity could be a good substituent of PVdF binder for all solid-state lithium-ion battery.
궁찬영,심지민,백지훈,정다운,이종찬 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
For safety problem, lithium-ion battery is now on transition to be all-solid-state, and then electrolytes should be substituted to solid state. In this research, composites of branched-graft copolymer(BgCP) which are based on PEGMA and MA-POSS (Matrix) with Poly(ethylene glycol) grafted graphene oxide(PGO) (filler material) were applied to solid electrolytes. Composite electrolyte with 0.2wt% of PGO showed one higher order of ionic conductivity than BgCP without PGO. It is caused by Lewis acid-base interaction, which induces much more lithium salt dissociation in the composite. Electrochemical properties of composite electrolytes were evaluated and composite electrolytes with 0.2 wt% PGO showed noteworthy cycle performance compared to BgCP. This is because the ion-conducting pathway formed by the filler implements a high ionic conductivity.
궁찬영,심지민,백지훈,정다운,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Conventional liquid electrolyte based lithium-ion battery system has safety problems e.g. leakage, explosion. To solve aforementioned problems, solid-state lithium-ion battery system is imperative. This research shows composite electrolyte for this reason. The solid-state composites electrolyte is composed of PEGMA and MA-POSS copolymer matrix with poly(ethylene glycol) grafted graphene oxide filler material. 0.2wt% of filler material made pretty higher ionic conductivity conductivity of the matrix electrolyte than the matrix without the filler material. Lewis acid-base interaction making lithium salts dissociation included in the matrix could explain the superiority. Also, the composite electrolyte showed quite stable cycle performance compared to the matrix without the filler since ion-conducting pathways were formed by implementing the filler.
궁찬영,정다운,이종찬 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Lithium sulfur battery has attracted tremendous attention of global energy industry because of its huge theoretical capacity and energy density. However, continuous capacity fading with charge and discharge process has inhibited its commercialization. Lithium sulfur battery’s poor cycle stability is caused of elution of lithium polysulfide which is reduced product of sulfur that is active material of lithium sulfur battery. Herein, polythiophene-polyethyleneglycol based cross-linked polymer coated carbon-sulfur composite were prepared for cathode of lithium sulfur battery. In one hand, cross-linked structure coating suppressed sulfur’s expansion during charging/discharging process so that reduced generation of lithium polysulfides. On the other hand, polythiophene and polyethyleneglycol introduced electronic ionic conductivity respectively so that minimized resistance of coating layer. From this strategy, coated carbon-sulfur composite showed enhanced electrochemical performances.