Lithium secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., to achieve high capacity, good charge-discharge cycle characteristics, and excellent load characteristics

Active Publication Date: 2006-10-18
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for batteries using lithium cobalt oxide,

Method used

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Examples

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Embodiment 1

[0077]

[0078] As the active material, lithium cobaltate LiCoO with an average particle size of 13 μm was used as a lithium cobaltate-based compound (A) at a mass ratio of (B) / (A) of 0.25. 2 and LiNi having an average particle diameter of 12 μm as the lithium nickel cobaltate compound (B) 0.81 co 0.16 al 0.03 o 2 The resulting mixture. A positive electrode mixture composition containing 98 parts by mass of the active material mixture, 1 part by mass of acetylene black as an electron conduction aid, 1 part by mass of polyvinylidene fluoride as a binder, and NMP as a solvent was prepared. The composition containing the positive electrode mixture was prepared by dissolving polyvinylidene fluoride in NMP in advance, adding the above-mentioned active material mixture and acetylene black to the solution, further adding NMP while stirring, and adjusting the viscosity while fully dispersing. On both sides of an aluminum foil with a thickness of 15 μm, the composition containing...

Embodiment 2

[0090] When preparing the positive electrode mixture composition, the content ratio (B) / (A) (mass ratio) of the lithium cobaltate-based compound (A) and the lithium-nickel-cobaltate-based compound (B) was changed to 0.05, and in addition, A lithium ion secondary battery was produced in the same manner as in Example 1.

Embodiment 3

[0092] When preparing the positive electrode mixture composition, the content ratio (B) / (A) (mass ratio) of lithium cobaltate-based compound (A) and lithium-nickel-cobaltate-based compound (B) was changed to 0.67, in addition, A lithium ion secondary battery was produced in the same manner as in Example 1.

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Abstract

The present invention provides a lithium ion secondary battery having high capacity, high working voltage, and excellent load characteristics and excellent charge/discharge cycle characteristics when charges up at a high voltage. The lithium ion secondary battery has a positive electrode containing as an active material LipCoqMa(1-q)O2(A) and a compound (B) represented by general formula, LixNiyCozMb(1-y-z)O2, in a mass ratio of (B)/(A)=0.04 to 0.8, having a positive mix layer having a density of 3.7 g/cm<SP>3</SP>, wherein,0.5<=p<=1.2, 0<q<=1, 0.5<=x<=1.2, y+z<1, Y>0, z>0, Ma, Mb is at least one element selected from Al, Mn, Fe, Mg, Si, Ti, Zn, Mo, V, Sr, Sn, Sb, W, Ta, Nb, Ge, and Ba.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, more specifically to a lithium ion secondary battery with high capacity, high voltage and excellent load characteristics. Background technique [0002] Lithium-ion secondary batteries have a high voltage and high energy density, and demand for driving power sources of portable devices and the like tends to increase. At present, lithium cobalt oxide with large capacity and good reversibility is mainly used as the positive electrode active material of this lithium ion secondary battery. [0003] The current lithium ion secondary battery is required to have a higher capacity along with the improvement of the devices to which it is applied. However, for batteries using lithium cobalt oxide, the battery capacity is basically close to the limit. Therefore, with regard to improving the capacity of lithium ion secondary battery, it is being studied to replace lithium cobalt oxide recently, and...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/131H01M4/36H01M4/505H01M4/525H01M4/62H01M10/05H01M10/052H01M10/0566H01M10/0567
CPCY02E60/10
Inventor 舆石真弓东彪松本和伸
Owner MAXELL HLDG LTD
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