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Lithium secondary battery

A lithium secondary battery and current collector technology, applied in secondary batteries, lithium storage batteries, batteries, etc., can solve problems such as battery short circuit, solid electrolyte membrane rupture, deterioration of battery characteristics, charge-discharge cycle characteristics, etc., to improve cycle characteristics Effect

Inactive Publication Date: 2014-12-24
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] On the other hand, in an all-solid-state battery, there is a problem that unless the bonding state at the interface between the electrode and the solid electrolyte membrane is good, the battery characteristics, especially the charge-discharge cycle characteristics will be significantly deteriorated due to poor contact
However, when an all-solid-state lithium-ion battery is prepared by using a three-dimensional networked aluminum porous body as a current collector for the positive electrode, a three-dimensional networked copper porous body as the current collector for the negative electrode, and a solid electrolyte membrane as the electrolyte, and to When the all-solid-state lithium-ion battery is under pressure, it is found that in the all-solid-state lithium-ion battery, there is a case where the solid electrolyte membrane is ruptured and the battery is short-circuited

Method used

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Examples

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Comparison scheme
Effect test

manufacture example 1

[0120]

[0121] (formation of conductive layer)

[0122] A polyurethane foam (porosity: 95%, thickness: 1 mm, number of pores per inch (pore diameter: 847 μm): 30 pores) was used as the resin base material. Form an aluminum film on the surface of polyurethane foam by sputtering so that the weight per unit area is 10 g / m 2 , thereby forming a conductive layer.

[0123] (Molten Salt Plating)

[0124] A urethane foam on which a conductive layer was formed was used as a workpiece. Fix the workpiece on the fixture with power supply function, then place the fixture in the glove box, which has been set as an argon atmosphere and low humidity environment (dew point: below -30°C), and then immerse the fixture at a temperature of 40°C molten salt plating bath (composition: 33 mol% 1-ethyl-3-methylimidazolium chloride (EMIC) and 67 mol% AlCl 3 )middle. Connect the fixture holding the workpiece to the cathode side of the rectifier. An aluminum plate (purity: 99.99%) as a counter e...

manufacture example 2

[0130]

[0131] "Aluminum porous body 2" was obtained by performing the same operation as in Production Example 1, except that the aluminum porous body before annealing was heat-treated at 200°C for 30 minutes instead of heat-treating the porous body at 345°C for 1.5 Hour. The hardness of the "aluminum porous body 2" was 1.12 GPa.

manufacture example 3

[0133]

[0134] (formation of conductive layer)

[0135] A polyurethane foam similar to that used in Production Example 1 was used as the resin base material. A copper film was formed on the surface of polyurethane foam by sputtering so that its weight per unit area was 10 g / m 2 , thereby forming a conductive layer.

[0136] (plating)

[0137] Next, the urethane foam on which the conductive layer was formed was immersed in a copper sulfate plating bath to perform electroplating, thereby obtaining a "copper-resin composite porous body 1" in which the copper-resin composite porous body 1 Copper plating is formed on the surface of the polyurethane foam (copper weight per unit area: 400g / m 2 ).

[0138] (removal of polyurethane foam)

[0139] The "copper-resin composite porous body 1" was heat-treated to burn it, thereby removing the polyurethane foam. Subsequently, the resulting product was heated in a reducing atmosphere to reduce it, thereby obtaining "copper porous bod...

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Abstract

Provided is a lithium secondary battery using three-dimensional, mesh-like porous bodies as collectors, and wherein internal resistance does not increase even after repeated charging and discharging. The lithium secondary battery, wherein the positive electrode and negative electrode use the three-dimensional, mesh-like porous bodies as collectors and are configured by at least an active substance being filled into the pores of the three-dimensional, mesh-like porous bodies, is characterized by the three-dimensional, mesh-like porous body for the positive electrode being a three-dimensional, mesh-like aluminum porous body having a hardness of no more than 1.2 GPa, and the three-dimensional, mesh-like porous body for the negative electrode being a three-dimensional, mesh-like copper porous body having a hardness of no more than 2.6 GPa.

Description

technical field [0001] The present invention relates to a lithium secondary battery having a lithium ion conductive solid electrolyte membrane. Background technique [0002] In recent years, batteries used as power sources for portable electronic devices such as mobile phones and smartphones, and electric vehicles and hybrid vehicles respectively using an engine as a power source have been expected to have higher energy density. Specifically, since lithium has a small atomic weight and high ionization energy, lithium ion secondary batteries have been actively studied in various fields as batteries capable of achieving high energy density. [0003] Current lithium ion secondary batteries use an organic electrolytic solution as the electrolytic solution. However, although the organic electrolyte solution exhibits high ion conductivity, the organic electrolyte solution is a flammable liquid. Therefore, when the organic electrolytic solution is used as the electrolytic solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/38H01M4/46H01M4/505H01M4/525H01M4/58H01M4/62H01M10/052H01M10/0562
CPCH01M4/485H01M4/505H01M4/525H01M4/661H01M4/74H01M4/745H01M4/80H01M10/0525H01M10/0562H01M4/38H01M4/382H01M10/052H01M2300/0068Y02E60/10H01M4/502H01M4/523H01M4/583H01M2220/20H01M2220/30
Inventor 西村淳一后藤和宏细江晃久吉田健太郎
Owner SUMITOMO ELECTRIC IND LTD
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