Preparation and cation mixing phenomena of LiCo$O_2$and $LiCo_{1-x}$$Ni_x$$O_2$ solid solutions

LiCo$O_2$$LiCo_{1-x}$$Ni_x$$O_2$고용체의 제조 및 양이온 혼합 현상

  • Published : 1999.12.01

Abstract

$LiCoO_2$and $LiCo_{1-x}$$Ni_x$$O_2$ solid solutions were fabricated by the solid state reaction process. The structural cation mixing phenomena were investigated using XRD, SEM, particle size analysis and $^7$Li NMR,The synthesized LiCoO$_2$ and $LiCo_{1-x}Ni_XO_2$ microcrystallines showed the hexagonal layered structures. Mean particle sizes were increased with the increase of the amount of nickel in the solid solutions. The cation mixing effects were increased as increasing the fraction of nickel(x), x = 0.3, 0.5, 0.7. the peak frequency of $^7$Li NMR was shifted to the higher frequency and the line width increased as increasing the amount of nickel in the solid solutions.

$LiCoO_2$와 고용체 화합물인 $LiCo_{1-x}Ni_XO_2$을 고상반응법을 이용하여 제조하여 XRD, SEM, 입도분석, $^7$Li NMR을 통하여 그 구조적 cation mixing 현상을 조사하였다. 고상반응법으로 합성한 $LiCoO_2$$LiCo_{1-x}$$Ni_x$$O_2$의 미세결정상은 hexagonal layered structure를 보여주었고 전반적인 입도는 니켈의 함량에 따라 증가되었다. 고용체에 있어서 Ni의 함량 분율(x)이 x=0.3, 0.5, 0.7로 Ni의 양이 증가함에 따라 cation mixing 효과가 증가되었다. $^7$Li NMR의 peak frequency는 Ni의 함량이 증가함에 따라 high frequency로 shift되었고 line width는 Ni의 함량에 따라 넓어지는 양상을 보여주었다.

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References

  1. Solid State ionics v.84 R. Koksbang;J. barker;H. Shi;M.Y. saidi
  2. J. Appl. Electrochem. v.27 D. G. Fauteux;A. Massucco;J. Shi;C. Lampe-Oennerud
  3. J. Solid State Chem. v.94 P. Barboux;J.M. tarascon;F.K. Shokoohi
  4. J. Power Source v.72 Jiang Fan;P.S. Fedkiw
  5. J. Mat. Sci. Lett. v.32 I.H. Oh;S.A. Hong;Y.K. Sun
  6. Solid State Ionics v.62 E. Rossen;J.N. reimers;J.R. Dahn
  7. J. Mat. Sci. v.18 E. Antolini;L. Giorigi;M. Carewska
  8. J. Electrochem. Soc. v.144 H. Arai;S. Okada;Y. Sakurai;J. Yamaki
  9. Solid State Ionics v.66 E. Zhecheva;R. Stoyanova
  10. Electrochimica Acta v.38 T. Ohzuku;A. Ueda;M. Nagayama;Y. Iwakoshi;H. Komori
  11. J. Electrochem. Soc. v.140 R.J. Gummow;M.M. Thackeray
  12. J. Electrochem. Soc. v.141 A. Ueda;T. Ohzuku
  13. Solid State Ionics v.89 Y.M. Choi;S.I. Pyun;S.I. Moon
  14. Solid State Ionics v.44 J.R. Dahn;U. von Sacken;C.A. Michal
  15. Mat. res. Bull. v.25 J. Morales;C. Perez-Vicente;J.L. Tirado