Cathodic materials for lithium-ion batteries based on spinels Li
x
Mn2−y
Me
y
O4: Synthesis, phase composition, and structure of Li
x
Mn2−y
Cr
y
O4 at x = 1.0−1.2 and y = 0−0.5 |
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Authors: | E I Kachibaya R A Imnadze T V Paikidze R A Akhvlediani |
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Institution: | (1) Agladze Institute of Inorganic Chemistry and Electrochemistry, National Academy of Sciences of Georgia, GAS, ul. Jikiya 7, Tbilisi, 380086, Georgia |
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Abstract: | Extralithiated chromium-doped finely divided lithium-manganese spinels are synthesized as a result of a two-step solid-phase process with use made of the fusion-saturation method. The spinels are intended for application as cathodic materials in lithium-ion batteries. The phase composition and structural characteristics of samples of cathodic materials of the type Li x Mn2?y Cr y O4 are studied. The samples with x = 1.0?1.2 and y = 0?0.5 are characterized by phase purity and cubic syngony with parameter a = 0.817?0.823 nm and a disperseness equal to 1–2 nm. The maximum content of chromium and lithium in Li x Mn2?y Cr y O4 that does not lead to violation of cubic syngony is determined. Lithium excess in the cathodic material that does not exceed 0.2 formula units may be used for compensating the irreversible capacity. Replacing some manganese atoms by chromium may facilitate retention of the structures’s integrity in the course of cycling. |
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Keywords: | lithium-ion battery cathodic material two-step solid-phase method of synthesis doping spinel compound of the type Li x Mn2− y Cr y O4 |
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