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All-solid-state lithium secondary battery and production method for all-solid-state lithium secondary battery

A lithium secondary battery and manufacturing method technology, applied in the direction of secondary battery, electrolyte storage battery manufacturing, lithium storage battery, etc., can solve problems such as the limitation of the use temperature range, achieve the effect of easy handling and high current

Pending Publication Date: 2022-02-08
DARE JAPAN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction of sulfide with water may generate hydrogen sulfide, so the temperature range of use is limited

Method used

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  • All-solid-state lithium secondary battery and production method for all-solid-state lithium secondary battery
  • All-solid-state lithium secondary battery and production method for all-solid-state lithium secondary battery
  • All-solid-state lithium secondary battery and production method for all-solid-state lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] To fabricate the battery body 1b, a laminate in which solid electrolyte-dispersed polymer layers are provided on both surfaces of the oxide solid electrolyte layer 11 is prepared. In this preparation, first, a porous oxide solid electrolyte particle bonding layer to which oxide solid electrolyte particles 11 a are bonded is produced. The oxide solid electrolyte particles are composed of LLZO.

[0106] Next, a coating liquid composed of a lithium ion conductive polymer material in which oxide solid electrolyte particles and a lithium salt are dispersed is coated on both surfaces of the oxide solid electrolyte particle binding layer. PEO was used as the lithium ion conductive polymer material, LiFSI was used as the lithium salt, and particles made of LLZO were used as the oxide solid electrolyte particles. Also, make the weight ratio of PEO to LiFSI 1:1. By this coating, at least the lithium ion conductive polymer material and the lithium salt enter between the oxide so...

Embodiment 2

[0114] A battery body 1 b was produced in the same manner as in Example 1 except that the weight ratio of PEO and LiFSI was 4:1. In general all-solid-state lithium secondary batteries other than the present invention, when PEO and LiFSI are used, the weight ratio is the same as that of this example. Impedance measurement was carried out in the same manner as in Example 1 for the battery body 1b. Figure 8 A Cole plot of this result is shown in . As a result, the resistance of the battery body of the reference example was approximately 2000Ω.

[0115] Even the resistance of Example 2 is a practically low resistance, but the result of the resistance of Example 1 is about 1 / 40 of the resistance of Example 2. Therefore, the lithium ion conductive polymer material 11b between the oxide solid electrolyte particles 11a of the oxide solid electrolyte layer 11, the positive electrode side solid electrolyte dispersed polymer layer 12, and the lithium ion conductive polymer material 13...

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Abstract

An all-solid-state lithium secondary battery (1) comprising: an oxide solid electrolyte layer (11) including oxide solid electrolyte particles (11a) having lithium ion conductivity; a positive electrode active material layer (13) arranged on one surface side of the oxide solid electrolyte layer (11); a negative electrode active material layer (16) arranged on the other surface side of the oxide solid electrolyte layer (11); and a solid electrolyte dispersion polymer layer arranged between the oxide solid electrolyte layer (11) and at least either the positive electrode active material layer (13) or the negative electrode active material layer (16) and having oxide solid electrolyte particles dispersed in a lithium ion conductive polymer material that has lithium ion conductivity. The positive electrode active material layer (13), the negative electrode active material layer (16), the solid electrolyte dispersion polymer layer, and the oxide solid electrolyte layer (11) are integrated.

Description

technical field [0001] The invention relates to an all-solid lithium secondary battery and a manufacturing method of the all-solid lithium secondary battery. Background technique [0002] In general, lithium-ion batteries using non-aqueous electrolyte solutions are popular. However, the lithium-ion battery has a temperature limit because the electrolyte is flammable, there is a risk of fire or the like, or an organic solvent is used. Therefore, an all-solid lithium secondary battery using a polymer electrolyte is being developed. However, polymer electrolytes have low ionic conductivity at low temperatures, and their operating temperature range is narrower than that of lithium-ion batteries using the aforementioned non-aqueous electrolyte solutions. Therefore, an all-solid lithium secondary battery using a sulfide-based solid electrolyte is being developed. However, the reaction of sulfide with water may generate hydrogen sulfide, so the temperature range of use is limite...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525H01M10/058
CPCH01M10/0562H01M10/0525H01M10/058H01M2300/0094H01M10/052H01M10/056H01M10/0585Y02E60/10Y02P70/50
Inventor 佐藤一朴甲相上田博幸
Owner DARE JAPAN INC