Dynamic measurements of Li depth profiles in a Li-ion battery system under charging condition by means of ERD and RBS techniques

Bun Tsuchiya, Kenji Morita, Shinji Nagata, Takehisa Kato, Yasutoshi Iriyama, Hidetsugu Tsuchida, Takuya Majima

研究成果: Article査読

8 被引用数 (Scopus)

抄録

Depth profiles of Li in a Li-ion battery system of Au/LiCoO2/LATP/Pt (LATP:Li1+X+YAlYTi2-YGeXP3-XO12) have been in situ measured at several stages of charging by means of the elastic recoil detection (ERD) and Rutherford backscattering (RBS) techniques with 9 MeV O4+ ion beam. The thicknesses of LiCoO2 and Au are estimated from the RBS spectrum for the as-received specimen to be 190 and 27 nm, respectively. From the ERD spectrum, it is also found that there exists impurity hydrogen of ~5% in LiCoO2. Moreover, it is found from the ERD data analysis after the first charging of 0.48 × 1016 e/cm2 to Au electrode that the fractional concentration of Li in LiCoO2 at the interface with Au electrode steeply decreases to 0.8, recovers with depth toward the interface with LATP and attains at 1.3 above the original value. With increasing the amount of charge supplied, the slope in the Li composition from Au electrode to LATP increases gradually. The data on the charging is concluded to include the irradiation effects due to the incident O ions, since the data on a nonirradiated part of the specimen obtained after finish of the charging shows that Li is almost completely reduced from LiCoO2. The dynamics of Li composition in LiCoO2 as a function of charging supplied is discussed in connection with hydrogen impurity and irradiation effect of the incident O ions.

本文言語English
ページ(範囲)1187-1191
ページ数5
ジャーナルSurface and Interface Analysis
46
12-13
DOI
出版ステータスPublished - 2014 12月 1

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

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