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Positive electrode for lithium ion secondary battery, positive electrode sheet for lithium ion secondary battery, and manufacturing method thereof

A secondary battery, lithium ion technology, used in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of increased insulating material costs, increased thickness of battery cells, cracks, etc., and achieves the effect of reducing manufacturing costs.

Pending Publication Date: 2021-12-03
ENVISION AESC JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are problems such as an increase in the thickness of the battery cell due to an increase in the thickness of the active material wrapping part, an increase in the cost of insulating materials, and a risk of cracks during drying.

Method used

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  • Positive electrode for lithium ion secondary battery, positive electrode sheet for lithium ion secondary battery, and manufacturing method thereof
  • Positive electrode for lithium ion secondary battery, positive electrode sheet for lithium ion secondary battery, and manufacturing method thereof
  • Positive electrode for lithium ion secondary battery, positive electrode sheet for lithium ion secondary battery, and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0080] The electrode according to this embodiment is a positive electrode for a lithium ion secondary battery. figure 1 It is a partial sectional view of the electrode sheet 10 for explaining the structure of the positive electrode electrode for lithium ion secondary batteries of this embodiment. Positive electrodes for lithium-ion secondary batteries from figure 2 The electrode sheet 10 is cut out and produced. figure 1 For viewing from the direction of arrow I figure 2 The cross-sectional view at the line I-I of the electrode sheet 10.

[0081] The positive electrode for the lithium ion secondary battery of the present embodiment has a current collector (hereinafter also referred to as metal foil 9 ), and a first composite material containing at least a positive electrode active material provided on at least one surface of the current collector (metal foil 9 ). The material layer 11 and the second composite material layer 12 partially covered by the first composite mate...

Embodiment 1

[0215] Figure 9 (a1)~ Figure 9 (a3) is a figure which shows the flow of the manufacturing method of the electrode sheet 10 of Example 1 of this invention.

[0216] Such as Figure 9 Shown in (a1), in embodiment 1, as image 3 , Figure 6 As explained in , firstly, the second composite material layer 12 is coated on at least one surface of the metal foil 9 through step A1 or step A2. Therefore, the position of the die coater 22 of the coating device of the second composite material layer 12 can be set at a height h1 close to the upper surface of the metal foil 9 . which can be lower than Figure 9 The position of the die coater 22 of the coating device of the comparative example of (b2), that is, the height h2.

[0217] In this way, the die coater 22 can be arranged close to the metal foil 9, so as Figure 9 As shown in (a2), thin film coating of the second composite material layer 12 can be performed.

[0218] and, if Figure 9 As shown in (a3), the first composite ...

Embodiment 2

[0224] Figure 10 (a) and Figure 10 (b) is a diagram schematically showing a cross-sectional view of a lithium ion secondary battery of Example 2 fabricated using the positive electrode of the present invention.

[0225] Figure 10 The battery 150 of Example 2 shown in (a) uses the positive electrode 121 of the present invention having the second composite material layer 12 containing a conductive substance. Such as Figure 10 As shown in (a), under the situation that metal foreign matter 32 is mixed in the second composite material layer 12 in the step, metal foreign matter 32 is oxidized as the metal ion (M ＋ ) dissolved in the electrolyte. If it reaches the negative side, then as Figure 10 As shown in (b), metal ions undergo a reduction reaction on the surface of the negative electrode at a reduction potential to form metal (M) and precipitate.

[0226] However, even if the deposited metal grows and breaks through the isolation film 120, when it reaches the second c...

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Abstract

Provided is a positive electrode for a lithium ion secondary battery, the positive electrode comprising: a metal foil (9) (current collector); a first mix layer (11) provided on one surface of the metal foil (9) and containing a positive electrode active material; and a second mix layer (12) partially covered with the first mix layer (11) and composed of particles different from the active material as a main component, wherein the second mix layer (12) is provided at one end (11a) of the first mix layer (11) of the boundary between a region in which the first mix layer (11) is formed and a region in which the first mix layer (11) is not formed; one end (12a) of the second mix layer (12) is disposed between one surface of the metal foil (9) and the lower surface of the first mix layer (11) in the region in which the first mix layer (11) is formed, the other end (12b) is disposed in the region in which the first mix layer (11) is not formed, and the first mix layer (11) and the second mix layer (12) contain a conductive material dispersed therein.

Description

technical field [0001] The present invention relates to a positive electrode for a lithium ion secondary battery, a positive electrode sheet for a lithium ion secondary battery, and a method for producing the same. Background technique [0002] In recent years, attention has been paid to electric vehicles and hybrid vehicles in consideration of environmental issues, and technical demands for higher energy density and higher capacity of secondary batteries serving as driving sources have further increased. [0003] Such an electrode for a secondary battery is produced from an electrode sheet obtained by applying a slurry containing an active material to a belt-shaped metal foil such as aluminum or copper and drying it. The coating method of the active material can be roughly classified into an intermittent coating method and a continuous coating method. [0004] As a structure for suppressing electrical contact between the positive electrode foil exposed portion and the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCY02E60/10H01M4/0404H01M4/131H01M4/1391H01M4/625H01M4/75H01M2004/028H01M4/621H01M2004/021H01M4/62H01M10/0585Y02P70/50H01M10/0525
Inventor 佐藤萌子斋藤猛白石章一郎
Owner ENVISION AESC JAPAN LTD
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