Synthesis and electrochemical properties of layer-structured 0.5Li(Ni{sub 0.5}Mn{sub 0.5})O{sub 2}{emdash}0.5Li(Li{sub 1/3}Mn{sub2/3})O{sub 2} solid mixture.
A 1:1 mixture of electrochemically active Li(Ni{sub 0.5}Mn{sub 0.5})O{sub 2} and electrochemically inactive Li(Li{sub 1/3}Mn{sub 2/3})O{sub 2}, i.e. Li(Li{sub 0.17}Ni{sub 0.25}Mn{sub 0.58})O{sub 2}, has been synthesized by a sol-gel method. The mixture was calcined at 900 {sup o}C in air for 24 h and cooled at three different rates: quenched into liquid nitrogen, 2 {sup o}C/min, and 0.5 {sup o}C/min. It was found that the crystallographic structure and electrochemical properties of Li(Li{sub 0.17}Ni{sub 0.25}Mn{sub 0.58})O{sub 2} highly depend on the cooling rate. The sample quenched into liquid nitrogen exhibited a long irreversible plateau at ca. 4.5 V during the first charge, and the discharge capacity gradually increased from 170 to 210 mAh/g after 40 cycles. The samples cooled at slower rates exhibited more monoclinic character and cubic spinel phase was observed; they showed no plateaus at 4.5 V during the first charge and the discharge capacities also gradually increased from 80 and 55 mAh/g to 130 and 85 mAh/g for 2 and 0.5 {sup o}C/min-cooled samples, respectively.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 961328
- Report Number(s):
- ANL/CMT/JA-46644; JPSODZ; TRN: US201011%%601
- Journal Information:
- J. Power Sources, Vol. 124, Issue 2 ; Nov. 24, 2003; Conference: e; null; null; ISSN 0378-7753
- Country of Publication:
- United States
- Language:
- ENGLISH
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