The Ultrasonic Treatment Characteristics of LiV$_3$O$_8$ by New Synthesis

새로운 합성법에 의한 LiV$_3$O$_8$ 의 초음파처리 특성

  • 박수길 (충북대학교 공업화학과) ;
  • 김종진 (충북대학교 공업화학과) ;
  • 손원근 (충남대학교 고분자공학과) ;
  • 김상욱 (서울시립대학교 화학공학과) ;
  • 류부형 (동국대학교 안전공학과) ;
  • 이주성 (한양대학교 공업화학과)
  • Published : 1998.06.01

Abstract

The layered trivanadate, LiV$_3$O$_{8}$ has been investigated as a cathode material for secondary lithium batteries. Early in its development the preparation method of LiV$_3$O$_{8}$ strongly influenced its electrochemical properties, such as discharge capacity, rate capability and cycling efficiency. In the present experiment, a new synthesis route has been applied to obtain LiV$_3$O$_{8}$ . Instead of the conventional high temperature technique leading to the crystalline form, a solution technique producing the amorphous form has been used. This material, after dehydration, shows an electrochemical performance exeeding that of the crystalline one. The rationale for this behavior mainly lies in microscopic factors, i.e., in the possibility for the unit cell of amorphous LiV$_3$O$_{8}$ to insert up to 9 Li$^{+}$, instead of six for crystalline LiV$_3$O$_{8}$ . The ultrasonically treated products in water were characterized by XRD, TGA, DSC, and SEM. These measurements showed that the ultrasonic treatment process of crystalline LiV$_3$O$_{8}$ causes a decrease in crystallinity and considerable increases in specific surface area and interlayer spacing.g.

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