Solubility of LiCoO{sub 2} in molten carbonates

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:349011

Higashino, Masae; Yanagida, Masahiro; Tanimoto, Kazumi; Kojima, Toshikatsu; Tamiya, Yukiko; Matsumoto, Hajime; Asai, Takashi; Miyazaki, Yoshinori ^[1]; Takigawa, Yasuo ^[2]

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1. Osaka National Research Inst., Ikeda, Osaka (Japan)
2. Osaka Electro-Communication Univ., Neyagawa, Osaka (Japan)

The molten carbonate fuel cell (MCFC) has been widely researched and developed from the viewpoints of the high efficiency for electric power generation and low impact for environment. NiO is used for the cathode of MCFC but the dissolution of NiO into the carbonate electrolyte melt followed by deposition as Ni metal brings about short circuit between cathode and anode. LiCoO{sub 2} is expected to be an alternative cathode material. The solubility is a key factor for the evaluation of the stability of cathode materials. The solubility of LiCoO{sub 2} was proportional to P{sub CO{sub 2}}{sup 3/2} and P{sub O{sub 2}}{sup {minus}1/4} in (Li{sub 0.52}Na{sub 0.48}){sub 2}CO{sub 3}. It obeys the acidic dissolution mechanism. This result was the same dependence as that in (Li{sub 0.62}K{sub 0.38}){sub 2}CO{sub 3}. The solubility of LiCoO{sub 2} in (Li{sub 0.52}Na{sub 0.48}){sub 2}CO{sub 3} was about a half of that in (Li{sub 0.62}K{sub 0.38}){sub 2}CO{sub 3}. The solubility of LiCoO{sub 2} decreased with Li content in Li-K carbonate system. Their solubility of LiCoO{sub 2} was lower than that of NiO even under the pressurized cathode condition of MCFC.

• OSTI ID: 349011
• Report Number(s): CONF-970701--
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CATHODES
COBALT OXIDES
LITHIUM CARBONATES
LITHIUM OXIDES
MOLTEN CARBONATE FUEL CELLS
NICKEL OXIDES
POTASSIUM CARBONATES
SODIUM CARBONATES
SOLUBILITY