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Positive electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery and battery module

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve the problems of slow lithium ion insertion/release speed, high charge transfer resistance, increased overvoltage, etc. To achieve the effect of improving the charging and discharging speed, improving the charging and discharging characteristics, and low resistance

Inactive Publication Date: 2013-08-14
ELIIY POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in existing positive electrode materials for non-aqueous electrolyte secondary batteries, since the surface of the olivine-type lithium composite compound particles is not sufficiently covered with a carbonaceous film, the intercalation / release speed of lithium ions of the olivine-type lithium composite compound is slow. Slow, i.e., high charge transfer resistance, which leads to a problem of increased overvoltage at the positive electrode

Method used

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  • Positive electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery and battery module
  • Positive electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery and battery module
  • Positive electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery and battery module

Examples

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Effect test

Embodiment 1

[0133] LiFePO with a carbonaceous film coverage of 100% and a primary particle size of 0.1 μm to 2 μm 4 The agglomerate of particles (manufactured by Sumitomo Osaka Cement) was used as the positive electrode active material, acetylene black was used as the conductive agent, and polyvinylidene fluoride (PVdF) was used as the binder, weighed by 100:5:7 (parts by mass), and Acetylene black and polyvinylidene fluoride (PVdF) were charged into N-methyl-2-pyrrolidone (NMP) in a kneader, and stirred / kneaded. Next, the above-mentioned LiFePO was put into the obtained mixture 4 The pellets were kneaded by a kneader at a rotation speed of 100 rpm for 90 minutes to prepare a slurry.

[0134] Next, the slurry was coated on an aluminum foil with a coater, dried, and then pressed with a roll press to form a positive electrode active material layer with a thickness of 100 μm on the aluminum foil, which was used as the positive electrode of Example 1.

[0135] Next, graphite is used as the ...

Embodiment 2

[0137] The positive electrode and the secondary battery of Example 2 were fabricated in accordance with Example 1 except that the kneader was kneaded at a rotation speed of 100 rpm for 150 minutes.

Embodiment 3

[0154] Use the following raw materials to make positive electrodes.

[0155] Positive electrode active material: LCP420, TU-4 (trade name: manufactured by Sumitomo Osaka Cement Co., Ltd.)

[0156] Material ratio of positive electrode active material layer (mass parts)

[0157] Positive electrode active material: acetylene black: PVdF=100:5:7

[0158] The above-mentioned positive electrode active material is that the surface of primary particles of olivine-type lithium iron phosphate is coated with a carbon coating at a coverage area ratio of almost 100%, and the primary particles of the carbon coating are bonded to each other to form olivine secondary particles. Agglomerates of stone-type lithium iron phosphate particles. When the thickness of the positive electrode active material layer formed by applying and drying the slurry is rolled to adjust the thickness, the secondary particles are disintegrated and scattered due to the rolling, and basically become primary granular ol...

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Abstract

The present invention provides a positive electrode for a non-aqueous electrolyte secondary battery in which the charge / discharge rate of a secondary battery is increased by increasing the discharge / discharge rate of the positive electrode as a result of increasing the rate of incorporation and release of lithium ions in olivine-type phosphorous complex compound particles, a non-aqueous electrolyte secondary battery provided with this positive electrode for a non-aqueous electrolyte secondary battery, and a battery module provided with this non-aqueous electrolyte secondary battery. The positive electrode for a non-aqueous electrolyte secondary battery of the present invention is a positive electrode for a non-aqueous electrolyte secondary battery containing olivine-type lithium complex compound particles having a carbonaceous film formed on the surface thereof as a positive electrode active material, in which the coverage factor of the carbonaceous film relative to the surface area of the olivine-type lithium complex compound particles is preferably 95% or more, and the packed density of the olivine-type lithium complex compound particles in this positive electrode for a non-aqueous electrolyte secondary battery is preferably 0.90 g / cm3 to 1.09 g / cm3.

Description

technical field [0001] The invention relates to a positive electrode for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery and a battery module. [0002] This application is based on and claims the priority of Patent Application No. 2010-282433 filed in Japan on December 17, 2010, and Patent Application No. 2010-282434 filed in Japan on December 17, 2010, the contents of which are cited in this. Background technique [0003] In recent years, nonaqueous electrolyte secondary batteries containing olivine-type lithium composite compound particles as positive electrode active materials have been proposed as highly anticipated miniaturized, lightweight, and high-capacity batteries, and have been put into practical use (for example, Refer to Patent Documents 1 and 2). [0004] This non-aqueous electrolyte secondary battery consists of a positive electrode using a lithium-containing phosphoric acid compound having an olivine structure, a negat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/136H01M10/0525H01M4/58H01M10/0566
CPCH01M4/5825H01M4/133Y02E60/122H01M4/583Y02T10/7011H01M10/052H01M2004/021H01M4/366H01M4/136H01M4/362Y02E60/10H01M4/36H01M10/05H01M4/13H01M4/587H01M10/42H01M50/20H01M2010/4292H01M4/131Y02T10/70
Inventor 原富太郎福永孝夫井口隆康北川高郎山本良贵
Owner ELIIY POWER
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