전기화학회지 (Journal of the Korean Electrochemical Society)

  • 제16권3호
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  • Pages.162-168
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  • 2013
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  • 1229-1935(pISSN)
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  • 2288-9000(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
권호 표지
DOI QR코드

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고전압 구동 Li2MnO3-LiMO2(M=Ni, Co, Mn)/graphite 시스템에서의 전지 수명 및 고온 방치 특성 향상에 효과적인 플루오로 화합물계 전해액에 대한 연구

Improved Cycle Life and Storage Performance in High-Voltage Operated Li2MnO3-LiMO2(M=Ni, Co, Mn)/Graphite Cell System by Fluorine Compounds as Main Electrolyte Solvent

  • 유정이 ((주)삼성 SDI 중앙 연구소) ;
  • 신우철 ((주)삼성 SDI 중앙 연구소) ;
  • 이병곤 ((주)삼성 SDI 중앙 연구소)
  • 투고 : 2013.07.26
  • 심사 : 2013.08.12
  • 발행 : 2013.08.31
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초록

$Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn) 나노 복합체는 높은 이론 용량을 가지고 있어 전기 자동차용 2차 전지 활물질 재료로 많은 연구가 진행되고 있다. 하지만 $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn)로부터 250 mAh/g 이상의 용량을 구현하기 위해서는 4.4 V 이상의 구동전압이 필요하며, 이러한 높은 구동 전압은 전지의 수명 및 고온 방치 특성의 저해 요소로 작용하고 있다. 본 연구에서는 이러한 문제점을 개선하기 위해서 FEC (Fluoroethylene carbonate), 플루오로알킬 에테르, $LiPF_6$가 주성분인 신규 전해액(F-based EL)을 설계하였다. F-based EL은 1.3 M $LiPF_6$ EC/EMC/DMC (3/4/3, v/v/v) (STD) 대비 안정한 SEI를 형성하며, 산화 안정성이 뛰어나 $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn)/graphite 셀의 수명 및 방치 중 가스 저감에 효과가 있음을 확인할 수 있었다.

$Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn) nano-composite is a promising cathode material for xEV application due to its high theoretic capacity. However high voltage operating system of $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn) has worked as a hurdle in its application because of the inherent demerits, such as cycle life degradation and gas evolution. In order to enhance cell performance of $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn)/graphite cell, we examined electrolyte mainly composed of FEC, fluroalkyl ether and $LiPF_6$ (F-based EL). F-based EL showed much better discharging retention ratio than 1.3 M $LiPF_6$ EC/EMC/DMC (3/4/3, v/v/v) (STD). Furthermore gas evolution, especially CO and $CO_2$ during $60^{\circ}C$ storage for 30 days was dramatically reduced owing to thermal stable SEI formation effect of F-based EL.

키워드

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피인용 문헌

  1. Substituted Dioxaphosphinane as an Electrolyte Additive for High Voltage Lithium-Ion Cells with Overlithiated Layered Oxide vol.161, pp.4, 2014, https://doi.org/10.1149/2.100404jes