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All-solid-state battery

An all-solid battery, solid electrolyte layer technology, used in lithium batteries, battery electrodes, secondary batteries, etc., can solve problems such as electrolyte exhaustion and battery leakage, and achieve the effect of suppressing cracks.

Pending Publication Date: 2022-05-27
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Batteries using electrolyte have problems such as leakage and depletion of electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] The all-solid-state battery of Example 1 was fabricated in the following steps.

[0109] (production of active substances)

[0110] Lithium vanadium phosphate produced by the following method was used as an active material. Will Li 2 CO 3 , V 2 O 5 and NH 4 H 2 PO 4 As a starting material, wet mixing was performed with a ball mill for 16 hours, and the powder obtained after dehydration and drying was calcined at 850° C. for 2 hours in a nitrogen-hydrogen mixed gas. After wet-grinding the calcined product with a ball mill, it is dehydrated and dried to obtain an active material. Using an X-ray diffractometer, it was confirmed that the powder obtained by this preparation has the same properties as Li. 3 V 2 (PO 4 ) 3 the same crystal structure.

[0111] (Production of paste for active material layer)

[0112] The active material layer paste was prepared by adding 15 parts of ethyl cellulose as a binder to 95.4 parts of the obtained active material powder, 0....

Embodiment 2～6

[0141] It differs from Example 1 in that the length of the long axis and the length of the short axis of the carbon material were changed under the condition that the aspect ratio was substantially constant. The major axis length, minor axis length, and aspect ratio of the carbon material are adjusted by the shape of the carbon material added to the green sheets of the positive electrode active material layer and the negative electrode active material layer. In Examples 2 to 6, the same measurements as in Example 1 were performed.

Embodiment 7～12

[0143] The long-axis length and the short-axis length of the carbon material were changed, and were different from Example 1 in this point. The major axis length, minor axis length, and aspect ratio of the carbon material are adjusted by the shape of the carbon material added to the paste of the positive electrode active material layer and the negative electrode active material layer. In Examples 7 to 12, the same measurement as in Example 1 was performed.

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Abstract

This all-solid-state battery is provided with: a positive electrode layer having a positive electrode current collector and a positive electrode active material layer in contact with the positive electrode current collector; a negative electrode layer; and a solid electrolyte layer between the positive electrode layer and the negative electrode layer. The negative electrode layer has a negative electrode current collector and a negative electrode active material layer in contact with the negative electrode current collector, at least one of the positive electrode active material layer and the negative electrode active material layer has a plurality of voids and a plurality of carbon materials therein, and at least 8% of the plurality of voids are in contact with any one of the plurality of carbon materials.

Description

technical field [0001] The present invention relates to an all-solid-state battery. [0002] This application claims priority to Japanese Patent Application No. 2019-192584 filed in Japan on October 23, 2019, and the content is incorporated herein by reference. Background technique [0003] In recent years, batteries have been used for various purposes. Batteries are also used in portable batteries, for example, and improvements in size and weight, thinning, and reliability are sought. Batteries using electrolyte have problems such as leakage and exhaustion of electrolyte. Therefore, all-solid-state batteries using solid electrolytes have attracted much attention. [0004] The all-solid-state battery has a positive electrode layer, a negative electrode layer, and a solid electrolyte layer. When an all-solid-state battery is charged and discharged, the positive electrode or the negative electrode expands and contracts. Deformation due to expansion and contraction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0562H01M10/0585H01M10/0525
CPCH01M10/0562H01M4/13H01M4/625H01M10/0585H01M10/0525Y02P70/50Y02E60/10H01M4/133H01M2004/027H01M2004/028H01M2300/0068
Inventor 田中祯一塚田岳夫
Owner TDK CORPARATION