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All-solid battery

A technology of all-solid batteries and solid electrolytes, applied in solid electrolytes, secondary batteries, battery electrodes, etc., can solve problems such as electrolyte leakage in secondary batteries, and achieve the effect of suppressing capacity reduction

Pending Publication Date: 2020-10-09
TAIYO YUDEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondary batteries using electrolyte have problems such as electrolyte leakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0055] figure 1 is a schematic cross-sectional view showing the basic structure of the all-solid-state battery 100 . like figure 1 As exemplified in , the all-solid battery 100 has a structure in which a phosphate-based solid electrolyte layer 30 is sandwiched between a first electrode 10 and a second electrode 20 . The first electrode 10 is formed on the first main surface of the solid electrolyte layer 30 and has a laminated structure of the first electrode layer 11 and the first current collector layer 12 , and the first electrode layer 11 is located on the side of the solid electrolyte layer 30 . The second electrode 20 is formed on the second main surface of the solid electrolyte layer 30 and has a laminated structure of the second electrode layer 21 and the second current collector layer 22 , and the second electrode layer 21 is located on the side of the solid electrolyte layer 30 .

[0056] When using the all solid state battery 100 as a secondary battery, one of the...

no. 2 Embodiment approach

[0082] image 3 It is a cross-sectional view showing a schematic structure of an all solid state battery 100b according to the second embodiment. like image 3 As shown, in the second embodiment, the dummy electrode 71a1 provided in the cover layer 70 between the cell reaction region 80 and the upper surface of the laminated sheet 60, and any of the first external electrode 40a and the second external electrode 40b Neither is connected. The dummy electrode 71b1 provided in the cover layer 70 between the cell reaction region 80 and the lower surface of the laminated sheet 60 is not connected to any of the first external electrode 40a and the second external electrode 40b. The rest of the structure is the same as that of the all solid state battery 100a of the first embodiment, and thus detailed description thereof will be omitted. Also in the all-solid battery 100b of the second embodiment, the dummy electrodes 71a1 and 71b1 are provided at the positions closest to the cover...

Embodiment 1

[0109] Will Co 3 o 4 , Li 2 CO 3 , ammonium dihydrogen phosphate, Al 2 o 3 、GeO 2 Mixing and producing Li containing a predetermined amount of Co by solid phase synthesis 1.3 Al 0.3 Ge 1.7 (PO 4 ) 3 As a solid electrolyte material powder. Use 5mmφ ZrO 2 The obtained powder was subjected to dry pulverization (using a planetary ball mill at a rotation speed of 400 rpm for 30 min) so that the D90 particle size was 10 μm or less. Then, wet pulverization (dispersion medium: ethanol-toluene mixed solvent) was performed using beads with a diameter of 1.5 mmφ until the D90 particle size was 3 μm and the D50 particle size was 0.5 μm to prepare a solid electrolyte slurry. A binder and a plasticizer were added to the obtained slurry to obtain a solid electrolyte coating slurry, and a green sheet having a thickness of 10 μm was produced with a doctor blade. In the same manner as above, LiCoPO containing a predetermined amount was synthesized by the solid-phase synthesis metho...

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Abstract

An all-solid battery which can suppress reduction in capacity is provided. The all-solid battery includes: a multilayer chip having a substantially rectangular parallelepiped shape and including solidelectrolyte layers and electrodes alternately stacked, the electrodes being alternately exposed to two edge faces facing each other, the solid electrolyte layers adopting a phosphate solid electrolyte as a main components; and a pair of outer electrodes arranged on the two edge faces, wherein a pair of cover layers are provided between two faces, which face in a stacking direction of the solid electrolyte layers and the electrodes, of four faces other than the two edge faces of the multilayer chip and a cell reaction region where two adjacent electrodes exposed to different edge faces face each other across the solid electrolyte layer, and an active material layer containing an electrode active material is provided between the cover layers and the cell reaction region, no cell reaction occurring between the active material layer and an outermost electrode in the cell reaction region, the solid electrolyte layer being located between the active material layer and the cell reaction region.

Description

technical field [0001] The present invention relates to all solid state batteries. Background technique [0002] In recent years, secondary batteries have been used in various fields. Secondary batteries using an electrolyte solution have problems such as leakage of the electrolyte solution. Therefore, the development of an all-solid-state battery having a solid electrolyte and other constituent elements also made of a solid has been progressed. [0003] In the field of such all-solid-state batteries, in order to achieve high energy density, a stacked-type all-solid-state battery has been proposed, which has a laminated body formed by combining a battery cell (also called single cell) in which two or more groups are stacked and integrated (for example, refer to Patent Documents 1 and 2). [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open No. 2007-80812 [0007] Patent Document 2: International Publication No. 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0583
CPCH01M10/0562H01M10/0583H01M2300/0068H01M4/62H01M4/5825H01M10/0525H01M10/0585Y02E60/10Y02P70/50H01M50/11H01M50/431H01M50/548H01M50/117
Inventor 伊藤大悟佐藤宇人富泽祥江川村知荣关口正史
Owner TAIYO YUDEN KK