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Lithium ion secondary battery and solid electrolyte therefor

A solid electrolyte and secondary battery technology, which is applied in the manufacture of batteries with solid electrolytes, secondary batteries, and secondary batteries, etc., can solve the problems of difficult to achieve high output batteries, difficult to achieve close contact, and increased interface resistance. Ease of processing, reduced distance, and improved heat-resistant temperature

Inactive Publication Date: 2007-03-07
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an all-solid-state battery, its cathode, electrolyte, and anode are all made of solids, and therefore, intimate contact between these components is difficult to achieve, and as a result, interfacial resistance tends to increase
In this case, since the resistance to migration of lithium ions through the interface between the electrode and the electrolyte is so large, it is difficult to realize a battery with high output

Method used

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  • Lithium ion secondary battery and solid electrolyte therefor
  • Lithium ion secondary battery and solid electrolyte therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] (Preparation of lithium-ion conductive glass-ceramics)

[0089] Weigh raw material H 3 PO 4 , Al(PO 3 ) 3 , Li 2 CO 3 , SiO 2 and TiO 2 And mix well to make 35.0%P 2 o 5 , 7.5% Al 2 o 3 , 15.0% Li 2 O, 38.0%TiO 2 and 4.5% SiO 2 The composition of the oxide is expressed in mole percent on an oxide basis. The mixture was put into a platinum pot, heated and melted in an electric furnace at 1500° C. for 3 hours while stirring the molten glass. The molten glass is then poured into running water to produce glass flakes. The glass was heated at 950° C. for 12 hours to crystallize, whereby the target glass-ceramic was obtained. By powder X-ray diffraction, it was confirmed that the main crystal phase was Li 1+x+y Al x Ti 2-x Si y P 3-y o 12 (0≤x≤0.4, 0

Embodiment 2

[0105] (preparation of solid electrolytes containing many glass-ceramics)

[0106] The glass-ceramic powder obtained in Example 1 and LiBF loaded as a lithium salt 4 The copolymer of polyethylene oxide and polypropylene oxide is uniformly mixed in the ratio of 80:20 in the case of using a mixed solvent of NMP (N-methyl-2-pyrrolidone) and THF (tetrahydrofuran), and passed through a roller The coater coated the mixture on a PET film that had been subjected to mold release treatment and dried it, and then dried it at 120° C. under reduced pressure, and removed the solvent by evaporation to obtain a solid electrolyte sheet having a thickness of 30 μm. Another PET film which had been subjected to a release treatment was adhered to the solid electrolyte thus obtained. The composite electrolyte was then heated at 150 °C and squeezed through a roller press to remove the air bubbles retained in the solid electrolyte. Then, the PET film on both sides of the solid electrolyte was peele...

Embodiment 3

[0126] (preparation of solid electrolyte)

[0127]Weigh raw material H 3 PO 4 , Al(PO 3 ) 3 , Li 2 CO 3 , SiO 2 、TiO 2 and GeO 2 And mix well to make 37.0%P 2 o 5 , 8%Al 2 o 3 , 15.0% Li 2 O, 20.0%TiO 2 , 4% SiO 2 and 16% GeO 2 The composition of the oxide is expressed in mole percent on an oxide basis. The mixture was placed in a platinum pot, heated and melted in an electric furnace at 1400° C. for 3 hours while stirring the molten glass. Molten glass is poured into stainless steel molds to produce glass sheets. The glass was heated at 900° C. in an electric furnace, whereby a target glass-ceramic plate was obtained. By powder X-ray diffraction, it was confirmed that the main crystal phase was Li 1+x+y al x Ti 2-x Si y P 3-y o 12 (wherein 0≤x≤0.4, 0

[0128] This glass-ceramic was cut into Φ20 mm, and both surfaces thereof were polished to obtain a disk-shaped glass-ceramic (solid electrolyte) having a th...

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Abstract

A solid electrolyte for a lithium ion secondary battery has a laminate of at least two layers. The thickest layer of the laminate comprises lithium ion conductive crystalline, preferably lithium ion conductive glass-ceramics having a predominant layer of Li 1+x+y (Al, Ga) x (Ti, Ge) 2-x Si y P 3-y O 12 where 0 x 1, 0 y 1. In a preferred embodiment, thickness of an electrolyte layer comprising the lithium ion conductive glass-ceramics is 150 m or below and thickness of an electrolyte layer which does not contain lithium ion conductive glass-ceramics or contains only a small amount of lithium ion conductive glass-ceramics is 50 m or below.

Description

technical field [0001] The present invention relates to a solid electrolyte mainly suitable for lithium ion secondary batteries and a lithium ion secondary battery including the solid electrolyte. Background technique [0002] Such an electrolyte, in which a thin film with microporosity (called a separator) is impregnated with a non-aqueous electrolyte solution, is commonly used in lithium-ion secondary batteries in the past. Recently, more attention has been paid to lithium ion secondary batteries (polymer batteries) using polymer electrolytes made of polymers than the liquid-based electrolytes. [0003] Such polymer batteries use an electrolyte made in the form of a gel in which the polymer is impregnated with a liquid electrolyte. Since it keeps the liquid electrolyte in the polymer, it has the advantages of little possibility of leakage of liquid and thus improving the safety of the battery, and a greater degree of freedom in selecting the structure of the battery. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/36H01M10/40H01M6/18H01B1/00H01B1/06H01M4/02H01M4/13H01M10/05H01M10/052H01M10/056
CPCC03C10/0054H01M2300/0071H01M2300/0094H01M10/0525C03C10/0027H01B1/122C03C4/18H01M10/0562Y02E60/122Y02E60/10Y02P70/50
Inventor 印田靖
Owner OHARA
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