Structure and Electrochemical Behavior of Lithium-Manganese Spinels Doped with Chromium and Nickel |
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Authors: | Kulova T L Karseeva E I Skundin A M Kachibaya E I Imnadze R A Paikidze T V |
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Institution: | (1) Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia;(2) Agladze Institute of Inorganic Chemistry and Electrochemistry of Academy of Sciences of Georgia, GAS, ul. Jikiya 7, Tbilisi, 380086, Georgia |
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Abstract: | A series of compounds with the general formula LiMn2 - x - y
Cr
x
Ni
y
O4, where x + y = 0.05, 0.5, or 1.0, is synthesized. It is shown that all these compounds are pure-phase spinels with parameter aequal to 0.8193-0.8236 nm. Doping a stoichiometric lithium-manganese spinel simultaneously with chromium and nickel makes the spinel structure stable. The initial specific capacity of a spinel depends on its doping degree. Doping LiMn2O4 with chromium and nickel simultaneously at an Mn : Cr : Ni ratio of 195 : 3 : 2 raises the spinel's specific capacity and reduces the cycling degradation. The change in the discharge capacity of LiMn1.95Cr0.03Ni0.02O4 electrodes cycled at 20, 0, and -14°C is determined. |
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Keywords: | lithium-ion batteries lithium-manganese spinels discharge capacity cycling |
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