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All-solid battery

A technology of all-solid battery and solid electrolyte layer, which is applied in the direction of solid electrolyte, battery, secondary battery, etc., can solve the problems of inability to obtain sufficient cycle characteristics, increase of internal resistance of all-solid lithium-ion secondary batteries, etc., and achieve cycle characteristics Excellent, crack suppression effect

Pending Publication Date: 2021-07-23
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the solid electrolyte layer cracks, the internal resistance of the all-solid lithium-ion secondary battery will increase, and there is a problem that sufficient cycle characteristics cannot be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (Production of positive electrode unit green sheet)

[0081] On the PET film substrate, the paste (Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 paste) and dried to form a solid electrolyte layer 50 in the form of a sheet. Next, the positive electrode active material layer 32 forming paste (Li 3 V 2 (PO 4 ) 3 paste), the paste for forming the positive electrode current collector layer 31 (copper (Cu) paste), and the paste for forming the positive electrode active material layer 32 were dried to form the positive electrode 30 . Then, the PET film was peeled off to fabricate a positive electrode unit green sheet in which the solid electrolyte layer 50 and the positive electrode 30 were laminated. Among them, the thickness of the solid electrolyte layer 50 is 30 μm, the thickness of the positive electrode current collector layer 31 is 5 μm, and the thickness of the positive electrode active material layer 32 is 5 μm.

[0082] (Production of Negative Electrode Unit Green Sheet) ...

Embodiment 2

[0090] In the manufacture of the laminated body, in addition to dividing the positive electrode unit green sheet and the negative electrode unit green sheet by the difference of the positive electrode 30 (Lc n+1 -Lc n ) The average value is 50μm, the difference between the negative electrode 40 (La n+1 -La n ) was stacked in such a way that the average value of 50 μm, the same operation as in Example 1 was performed to produce an all-solid battery.

Embodiment 3

[0092] In addition to dividing the positive electrode unit green sheet and the negative electrode unit green sheet by the difference of positive electrode 30 (Lc n+1 -Lc n ) The average value is 100μm, the difference between the negative electrode 40 (La n+1 -La n ) was stacked in such a way that the average value of 100 μm, the same operation as in Example 1 was performed to produce an all-solid battery.

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Abstract

Provided is an all-solid battery with excellent cycle characteristics, for which the occurrence of cracks in a solid electrolyte layer due to volume change of an electrode is suppressed, even if a region with high porosity is not formed on the solid electrolyte layer. The all-solid battery includes: a laminate (20) that includes a first side surface (21) with which a positive electrode (30) and a negative electrode (40) are laminated with a solid electrolyte layer (50) interposed, at which a positive electrode current collector layer (31) is exposed, and a second side surface (22) facing the first side surface (21), at which a negative electrode current collector layer (41) is exposed; a positive electrode external terminal (35) attached to the first side surface (21); and a negative electrode external terminal (45) attached to the second side surface (22). At least one difference is 10 [mu]m or greater among: the difference between a distance Lcn from a second side surface side end part of the positive electrode (30) of an nth layer to the second side surface (22) and a distance Lcn+1 from the second side surface side end part of the positive electrode (30) of an n+1st layer to the second side surface (22); and the difference between a distance Lan from a first side surface side end part of the negative electrode (40) of the nth layer to the first side surface (21) and a distance of Lan+1 from the first side surface side end part of the negative electrode (40) of the n+1st layer to the first side surface (21).

Description

technical field [0001] The present invention relates to an all-solid battery, for example, an all-solid lithium ion secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2018-224938 filed in Japan on November 30, 2018, the content of which is incorporated herein. Background technique [0003] Lithium ion secondary batteries have been widely used as power sources for portable small devices such as cellular phones, notebook personal computers (PCs), portable information terminals (PDAs), and the like. Lithium-ion secondary batteries used in such portable small devices are required to be miniaturized, thinned, and improved in reliability. [0004] As the lithium ion secondary battery, a lithium ion secondary battery using an organic electrolytic solution as an electrolyte and a lithium ion secondary battery using a solid electrolyte are known. An all-solid lithium-ion secondary battery in which positive and negative electrodes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0585H01M50/548H01M50/562
CPCH01M10/0562H01M10/0585Y02E60/10Y02P70/50H01M2220/30H01M50/533H01M50/54H01M50/548H01M50/534H01M50/562H01M4/525H01M10/0525H01M2004/027H01M2004/028H01M2300/0065
Inventor 矢野知宏
Owner TDK CORPARATION