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7749661 
Journal Article 
COMPARATIVE-STUDY OF LICOO2, LINI1/2CO1/2O2 AND LINIO2 FOR 4-VOLT SECONDARY LITHIUM CELLS 
Ohzuku, T; Ueda, A; Nagayama, M; Iwakoshi, Y; Komori, H 
1993 
Yes 
Electrochimica Acta
ISSN: 0013-4686 
38 
9 
1159-1167 
English 
WOS:A1993LF21800002 
The preparation and characterization of LiNi1-xCoxO2 compounds (0 ≤ x ≤ 1) having a space group R3m, for 4 volt secondary lithium cells were investigated. By developing processing methods, homogeneous LiNi1-xCoxO2 samples were obtained and characterized by XRD, ir and magnetic susceptibility measurements. When increasing x in LiNi1-xCoxO2, the unit cell dimensions a and c in hexagonal setting, decreased almost linearly as a function of x. Magnetic susceptibility measurements indicated that LiNi1-xCoxO2 consists of low-spin states of Co3+ (t62g e0g) and Ni3+ (t62ge1g). All samples may be used as positive electrodes in nonaqueous lithium cells. Of these, LiCoO2 showed the highest working voltage and about 120 mAh g-1 of rechargeable capacity, and LiNi1 2Co1 2O2 showed the lowest working voltage and about 130 mAh g-1 of rechargeable capacity in the voltage range 2.5-4.2 V in 1 M LiClO4 propylene carbonate solution. LiNiO2 has more than 150 mAh g-1 of rechargeable capacity with working voltages above 3.5 V. Secondary lithium ion cells which consisted of LiNi1-xCoxO2 cathodes and natural graphite anodes, were also examined and the specific problems of establishing an innovative secondary lithium cell were discussed. © 1993. 
SECONDARY LITHIUM CELL; LAYERED MATERIAL; LITHIUM NICKELATE; LITHIATED GRAPHITE