Synthesis and Characterization of Li-Graphite intercalation Compounds

리튬-흑연 층간 화합물의 합성 및 특성

  • Oh, Won-Chun (Department of Chemistry, Dankook University) ;
  • Kim, Myung-Kun (Department of Chemistry, Dankook University) ;
  • Ko, Young-Shin (Institute of Carbon Chemistry, Seoul National University of Education)
  • 오원춘 (단국대학교 자연과학대학 화학과) ;
  • 김명건 (단국대학교 자연과학대학 화학과) ;
  • 고영신 (서울교육대학교 탄소화학연구소)
  • Received : 1994.07.25
  • Published : 1994.09.25


Li-GICs as a high performance energy storager were synthesized as a function of the Li content by the admixture and add-pressure method. The characteristics of these prepared compounds have been determined from the studies by X-ray diffraction, UV-VIS spectrometry and CHN analysis. It follows from the results of X-ray diffraction that the lower-stage intercalation compounds are formed as the Li contents increase, however the mixed stages in these compounds are also observed. In the case of the $Li_{40wt%}$, the compound with the structure of stage 1 has been predominently, but the structure of only stage 1 is not obtained. The $d_{001}$ value of stage 1 was determined to be ca. $3.70{\AA}$. An analysis of spectrometric data shows that each of the compounds gives distingushible energy state spectra. It is seen from the spectra that the positions of $R_{min}$ values, with increase in the Li contents, are shifted in the region of higher energy state. Such a result can be attributed to the formation of stable stages. The results of CHN analysis allow us to find the mixing state related to chemical compositions of the intercalated compounds and the superiority to admixture and add-pressure method. From the results determined, it reveals that $Li_{10wt%}$-GIC and $Li_{20wt%}$-GIC can be utilized for an anode of rechargable battery.