| US 7,455,933 B2 | ||
| Nonaqueous electrolyte secondary battery | ||
| Nao Shimura, Kawasaki (Japan); Koshin Tanaka, Tokyo (Japan); Masahiro Sekino, Kawasaki (Japan); Asako Satoh, Yokohama (Japan); Shusuke Inada, Takasaki (Japan); Akira Yajima, Tokyo (Japan); and Masayuki Oguchi, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on May 04, 2005, as Appl. No. 11/121,111. | ||
| Application 11/121111 is a continuation of application No. PCT/JP03/14154, filed on Nov. 06, 2003. | ||
| Claims priority of application No. 2002-322893 (JP), filed on Nov. 06, 2002. | ||
| Prior Publication US 2005/0221180 A1, Oct. 06, 2005 | ||
| Int. Cl. H01M 4/58 (2006.01); H01M 4/00 (2006.01) | ||
| U.S. Cl. 429—231.95 [429/223; 429/218.1] | 20 Claims |
| 1. A nonaqueous electrolyte secondary battery comprising a negative electrode, a nonaqueous electrolyte, and a positive electrode
containing an active material containing lithium composite oxide particles; wherein
the lithium composite oxide particles have a composition containing element M including Ni and/or Co, include secondary particles,
and exhibit a peak intensity ratio that satisfies the following formula (1),
a content of the lithium composite oxide particles in the active material is at least 50 wt %;
the active material satisfies the following formula (2), and has a particle distribution wherein a particle diameter at a
volumetric cumulative frequency of 90% (D90) falls within the range of 10 to 25 μm; and
the nonaqueous electrolyte contains a sultone compound including a ring having at least one double bond;
2.4≤(I003/I104)<5 (1)
0.95≤(YLi/YM)≤1.02 (2)
wherein I003 is a peak intensity (cps) at (003) plane in powder X-ray diffraction of the lithium composite oxide particles; I104 is a peak intensity (cps) at (104) plane in said powder X-ray diffraction; YLi is the number of moles of lithium in the active material; and YM is the number of moles of the element M in the active material.
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