TY - JOUR
T1 - Recent investigations on thin films and single particles of transition metal oxides for lithium batteries
AU - Uchida, I.
AU - Mohamedi, M.
AU - Dokko, K.
AU - Nishizawa, M.
AU - Itoh, T.
AU - Umeda, M.
N1 - Funding Information:
This work was partly supported by Grant-in-Aids for Scientific Research on Priority Area for “Electrochemistry of Ordered Interfaces” from the Ministry of Education Science, Sports and Culture, Japan and by the Lithium Battery Energy Storage Technology Research Association (LIBES), Japan.
PY - 2001/7
Y1 - 2001/7
N2 - Various aspects in the lithium battery field have been explored in our group: (i) uniform and dense thin films of LiMn2O4 up to 0.5 μm thickness have been synthesized by electrostatic spray deposition (ESD). The electrochemical properties of these films were investigated by cyclic voltammetry and impedance spectroscopy under a variety of experimental conditions. (ii) The kinetic and transport properties of lithium insertion/extraction of numerous sphere-shaped single particles have been also evaluated by transient techniques as well as by ac-impedance spectroscopy. (iii) Electrochemical quartz crystal microbalance (EQCM) technique was employed to study the low capacity fading of LiMn2O4 at elevated temperatures in LiPF6 containing solutions. It has been confirmed that this phenomenon is due to the manganese dissolution promoted by acidic species (HF) originated from the reaction of LiPF6 with water. (iv) Alternative materials were sought to replace the actual LiCoO2 or LiMn2O4. Among them: Li1.1Mn1.9O4, LiNi0.85Co0.15O2 and Li1.10Mn1.852Cr0.048O4. Interestingly, Li1.10Mn1.852Cr0.048O4 exhibited no significant capacity fading even in the 1M LiPF6/PC-EC (1:1) solution at 50°C upon 50 cycles of charge/discharge.
AB - Various aspects in the lithium battery field have been explored in our group: (i) uniform and dense thin films of LiMn2O4 up to 0.5 μm thickness have been synthesized by electrostatic spray deposition (ESD). The electrochemical properties of these films were investigated by cyclic voltammetry and impedance spectroscopy under a variety of experimental conditions. (ii) The kinetic and transport properties of lithium insertion/extraction of numerous sphere-shaped single particles have been also evaluated by transient techniques as well as by ac-impedance spectroscopy. (iii) Electrochemical quartz crystal microbalance (EQCM) technique was employed to study the low capacity fading of LiMn2O4 at elevated temperatures in LiPF6 containing solutions. It has been confirmed that this phenomenon is due to the manganese dissolution promoted by acidic species (HF) originated from the reaction of LiPF6 with water. (iv) Alternative materials were sought to replace the actual LiCoO2 or LiMn2O4. Among them: Li1.1Mn1.9O4, LiNi0.85Co0.15O2 and Li1.10Mn1.852Cr0.048O4. Interestingly, Li1.10Mn1.852Cr0.048O4 exhibited no significant capacity fading even in the 1M LiPF6/PC-EC (1:1) solution at 50°C upon 50 cycles of charge/discharge.
KW - Lithium battery
KW - Microelectrodes
KW - Stability
KW - Thin films
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U2 - 10.1016/S0378-7753(01)00724-8
DO - 10.1016/S0378-7753(01)00724-8
M3 - Conference article
AN - SCOPUS:0035396851
SN - 0378-7753
VL - 97-98
SP - 518
EP - 524
JO - Journal of Power Sources
JF - Journal of Power Sources
T2 - 10th International Meeting on Lithium Batteries
Y2 - 28 May 2001 through 2 June 2001
ER -
