A new three-volt spinel Li{sub 1+x}Mn{sub 1.5}Ni{sub 0.5}O{sub 4} for secondary lithium batteries
- Japan Storage Battery Co., Limited, Kyoto (Japan). Corporate R and D Center
The spinel LiMn{sub 1.5}Ni{sub 0.5}O{sub 4} has been prepared at low temperature using a new sol-gel process. X-ray diffraction analysis reveals that the obtained material presents a cubic spinel structure with a unit cell parameter lower than that of stoichiometric LiMn{sub 2}O{sub 4}. X-ray photoelectron spectroscopy confirms the divalent state of doped nickel in the material. Furthermore, LiMn{sub 1.5}Ni{sub 0.5}O{sub 4} compound can intercalate a second lithium both chemically and electrochemically, leading to the formation of a new Li{sub 2}Mn{sub 1.5}Ni{sub 0.5}O{sub 4} material with the same cubic spinel structure. This material presents only one plateau at around 3 V vs. Li/Li{sup +} with a large discharge capacity of 160 mAh/g and fairly good cyclability. This result is in contrast to the undoped Li{sub 2}Mn{sub 2}O{sub 4}, where two plateaus at 4 and 3 V are observed because of the occurrence of a structural transition caused by the Jahn-Teller effect. The structure and the electrochemical behavior of Li{sub 1-x}Mn{sub 1.5}Ni{sub 0.5}O{sub 4} are investigated and compared to those of LiMn{sub 1.5}Fe{sub 0.5}O{sub 4} material prepared by the same sol-gel process.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 256815
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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