TY - JOUR
T1 - Microvoltammetry for cathode materials at elevated temperatures
T2 - The 1999 International Symposium on Rechargeable
AU - Dokko, Kaoru
AU - Horikoshi, Soichi
AU - Itoh, Takashi
AU - Nishizawa, Matsuhiko
AU - Mohamedi, Mohamed
AU - Uchida, Isamu
N1 - Funding Information:
The present work was supported by Grant-in-Aid for Scientific Research (B) (No. 10555297) from The Ministry of Education, Science and Culture, Japan.
PY - 2000/9
Y1 - 2000/9
N2 - The electrochemical stability of single particles of cathode materials (LiMn2O4, Li1.10Cr0.048Mn1.852O4, LiCoO2 and LiNi0.85Co0.15O2) was investigated by means of a microelectrode technique at 25 °C and 50 °C. The cycle stability was evaluated by multi-cyclic voltammetry. LiMn2O4 showed good cycle stability in LiClO4/propylene carbonate (PC)+ethylene carbonate (EC) and LiBF4/PC+EC solutions even at 50 °C. On the contrary, in LiPF6/PC+EC, significant capacity fading during charge-discharge was observed at 50 °C. The cycle stability of LiMn2O4 in the latter solution was improved by partial substitution of Mn by Cr and Li. Regarding LiCoO2, its cycle life in LiClO4/PC+EC at 50 °C was unsatisfactory when the potential was scanned between 3.60 and 4.30 V. On the other hand, LiCoO2 retained 90% of its capacity when the potential scan was limited to 4.00 V. LiNi0.85Co0.15O2 showed similar trend at 50 °C.
AB - The electrochemical stability of single particles of cathode materials (LiMn2O4, Li1.10Cr0.048Mn1.852O4, LiCoO2 and LiNi0.85Co0.15O2) was investigated by means of a microelectrode technique at 25 °C and 50 °C. The cycle stability was evaluated by multi-cyclic voltammetry. LiMn2O4 showed good cycle stability in LiClO4/propylene carbonate (PC)+ethylene carbonate (EC) and LiBF4/PC+EC solutions even at 50 °C. On the contrary, in LiPF6/PC+EC, significant capacity fading during charge-discharge was observed at 50 °C. The cycle stability of LiMn2O4 in the latter solution was improved by partial substitution of Mn by Cr and Li. Regarding LiCoO2, its cycle life in LiClO4/PC+EC at 50 °C was unsatisfactory when the potential was scanned between 3.60 and 4.30 V. On the other hand, LiCoO2 retained 90% of its capacity when the potential scan was limited to 4.00 V. LiNi0.85Co0.15O2 showed similar trend at 50 °C.
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U2 - 10.1016/S0378-7753(00)00456-0
DO - 10.1016/S0378-7753(00)00456-0
M3 - Conference article
AN - SCOPUS:0033692305
SN - 0378-7753
VL - 90
SP - 109
EP - 115
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 1
Y2 - 14 November 1999 through 16 November 1999
ER -
