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Power storage element

A technology of electric storage components and active materials, applied in the direction of electrical components, circuits, negative electrodes, etc., which can solve the problems of not necessarily having sufficient output power

Active Publication Date: 2018-07-17
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, although the battery described in Patent Document 1 can have sufficient energy density, it may not necessarily have sufficient output power.

Method used

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Examples

Experimental program
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Embodiment 1

[0103] (1) Production of positive electrode

[0104] As a solvent, N-methyl-2-pyrrolidone (NMP), a conductive additive (acetylene black), a binder (PVdF) and an active material (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) particles were mixed and kneaded to prepare a mixture for positive electrodes. The compounding quantities of a conductive aid, a binder, and an active material are 5 mass %, 5 mass %, and 90 mass %, respectively. The mixed agent for the positive electrode prepared is 8mg / cm with the coating amount (weight per unit area) after drying 2 The method is respectively coated on the metal foil. After drying, roll pressing is performed. Then, vacuum drying is performed to remove moisture and the like. The thickness of the pressed active material layer (one layer) was 30 μm. The density of the active material layer is 2.5g / cm 3 .

[0105] (2) Production of negative electrode

[0106] As the active material, two types of particulate graphite and particulate amorphous carbon...

Embodiment 2～10

[0124] A lithium ion secondary battery was produced in the same manner as in Example 1 except that the battery was changed so as to have the configuration shown in Table 1.

[0125] In addition, in the example which further used amorphous carbon (non-graphitizable carbon) (see below) as an active material, the mass ratio of the graphite with a small particle diameter and the graphite with a large particle diameter was 2:7.

[0126] · Amorphous carbon (non-graphitizable carbon): manufactured by Kureha Battery Materials

[0127] Product name "Carbotron P(F)"

[0128] Average particle size 22μm, particles with holes inside, Vickers hardness 200

[0129] ・Average particle size of high-hardness active material (non-graphitizable carbon)

[0130] Except for separating the non-graphitizable carbon from the active material, the particle diameter was measured in the same manner as the above-mentioned measurement of the particle diameter frequency distribution of graphite. Then, the ...

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Abstract

A power storage element is provided which has sufficient energy density and sufficient output. This power storage element is provided with a negative electrode that has an active material layer containing an active material. The active material layer contains particulate graphite as the active material, and the particle diameter frequency distribution of the graphite has a first peak, and a secondpeak appearing at a greater particle diameter than that of the first peak. The particle diameter at the first peak is 10 [mu]m or less, and the particle diameter at the second peak is greater than 10[mu]m. The active material layer further contains a particulate high hardness active material which has a higher hardness than that of the graphite.

Description

technical field [0001] The present invention relates to electric storage elements such as lithium ion secondary batteries. Background technique [0002] Conventionally, there is known a lithium ion secondary battery including a negative electrode having an active material layer containing an active material. [0003] As such a battery, a battery in which the active material layer contains a composite carbon material (A) and a carbon material (B) as an active material is known. Carbonaceous or graphite coated (for example, Patent Document 1). In the battery described in Patent Document 1, the pressure-treated carbon material (a) is spheroidized natural graphite, and the carbon material (B) is selected from natural graphite (C), artificial graphite (D), and One or more of coated graphite (E) and amorphous carbon (F) in which the pressure-treated raw carbon material is coated with a carbonaceous substance or a graphite substance. [0004] In the battery described in Patent D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01G11/24H01G11/42H01M4/36
CPCH01G11/24H01G11/42H01G11/32H01G11/38H01M4/133H01M4/1393H01M4/364H01M4/625H01M10/0525H01M4/587Y02E60/10Y02E60/13H01G11/10H01G11/46H01G11/52H01G11/86H01M4/623H01M2004/021H01M2004/027
Inventor 佐佐木丈加古智典伊藤祥太下川亮介
Owner GS YUASA INT LTD
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