Cathode electroactive material, production method therefor...

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

Reexamination Certificate

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Details

C429S224000, C429S231950, C252S518100, C252S518100

Reexamination Certificate

active

07090822

ABSTRACT:
A cathode electroactive material for use in lithium ion secondary cells, process for producing the material, and lithium ion secondary cells using the cathode electroactive material, wherein the electroactive material predominantly comprises an Li—Mn composite oxide particles with the spinel structure and particles of the electroactive material have an average porosity of 15% or less, the porosity being calculated by employing the following equation:in-line-formulae description="In-line Formulae" end="lead"?Porosity (%)=(A/B)×100in-line-formulae description="In-line Formulae" end="tail"?(wherein A represents a total cross-section area of pores included in a cross-section of one secondary particle, and B represents the cross-section area of one secondary particle), a tapping density of 1.9 g/ml or more, a size of crystallites of 400 Å–960 Å, a lattice constant of 8.240 Å or less. The cathode electroactive material of the present invention is formed of particles which are dense and spherical and exhibit excellent packing characteristics to an electrode, and exhibit high initial capacity and capacity retention percentage at high temperature.

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Y. Xia et al, “Studies on Li-Mn-O spinal system (obtained from melt-impregnation method) as a cathode for 4 V lithium batteries Part V. Enhancement of the elevated temperature performance of Li/LiMn2O4cells”, Journal of Power Sources, vol. 24 (1998), pp. 24-28.
Sulzer Metco Particle Size Chart, 1-Sheet, 2004.

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