Cathode electroactive material, production method therefor...

Details Cathode electroactive material, production method therefor... Cathode electroactive material, production method therefor...

2005-05-10

2005-05-10

Kopec, Mark (Department: 1751)

Compositions

Electrically conductive or emissive compositions

Metal compound containing

C423S599000, C429S224000, C264S603000

Reexamination Certificate

active

06890456

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.

REFERENCES:
patent: 5807646 (1998-09-01), Iwata et al.
patent: 5911920 (1999-06-01), Hasezaki et al.
patent: 6267943 (2001-07-01), Manev et al.
patent: 6413673 (2002-07-01), Kasai et al.
patent: 6673491 (2004-01-01), Shirakawa et al.
patent: 20010014421 (2001-08-01), Shirakawa et al.
patent: 4-237970 (1992-01-01), None
patent: 4-14752 (1992-08-01), None
patent: 9-86933 (1997-03-01), None
patent: 10-162860 (1998-06-01), None
patent: 10-302767 (1998-11-01), None
patent: 10-321227 (1998-12-01), None
patent: 11-135119 (1999-05-01), None
patent: 11-176441 (1999-07-01), None
Sulzer Metco Particle Size Chart, 1-sheet, 2004.*
Y. Xia et al, “Studies on Li-Mn-O spinel 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.

Affiliated with

Also associated with

Rating

Cathode electroactive material, production method therefor... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cathode electroactive material, production method therefor..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cathode electroactive material, production method therefor... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3391658