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Solid-state battery having overheat self-protection function

A solid-state battery and self-protection technology, which is applied in the direction of batteries, secondary batteries, solid electrolytes, etc., can solve the problems of overheating safety and problems of solid-state batteries, and achieve the effect of reducing the risk of thermal runaway

Inactive Publication Date: 2020-06-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the safety problem caused by overheating of solid-state batteries, and to provide a solid-state battery with overheating self-protection function

Method used

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  • Solid-state battery having overheat self-protection function

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specific Embodiment approach 1

[0019] A solid-state battery with an overheating self-protection function, comprising a positive electrode, a negative electrode, and a composite solid electrolyte 1 located between the positive electrode and the negative electrode. The composite solid electrolyte 1 includes a solid ion conductor material 2 and an insulating thermal expansion material 3 .

[0020] Further, the mass ratio of the insulating thermal expansion material 3 to the composite solid electrolyte 1 is 5%-50%.

[0021] Preferably, the mass ratio of the insulating thermal expansion material 3 to the composite solid electrolyte 1 is 20%-35%.

[0022] Preferably, the insulating heat-expandable material 3 includes at least one of heat-expandable resin, heat-expandable rubber composite material, heat-expandable plastic, and plexiglass.

[0023] Further, the solid ion conductor material 2 includes an organic solid electrolyte, an inorganic solid electrolyte or an organic-inorganic composite solid electrolyte.

...

Embodiment 1

[0029] A solid-state battery with an overheating self-protection function, comprising a positive electrode, a negative electrode, and a composite solid electrolyte 1 between the positive electrode and the negative electrode, the composite solid electrolyte 1 including a solid ion conductor material 2 and an insulating thermal expansion material 3; the insulating The thermal expansion material 3 accounts for 5% by mass of the composite solid electrolyte 1 . The insulating thermal expansion material 3 is thermal expansion resin.

[0030] Further, the solid ion conductor material 2 is a PEO-based organic solid electrolyte, and the PEO-based organic solid electrolyte includes a PEO matrix and lithium bistrifluoromethanesulfonimide.

Embodiment 2

[0032] A solid-state battery with an overheating self-protection function, including a positive electrode, a negative electrode, and a composite solid electrolyte 1 between the positive electrode and the negative electrode, the composite solid electrolyte 1 includes a solid ion conductor material 2 and an insulating thermal expansion material 3; the insulating heat The mass ratio of the expansion material 3 to the composite solid electrolyte 1 is 50%, and the insulating thermal expansion material 3 is organic glass.

[0033] Further, the solid ion conductor material 2 is a sulfide-based solid electrolyte Na 3 P.S. 4 .

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Abstract

A solid-state battery having an overheat self-protection function belongs to the field of batteries. The specific scheme is as follows: the solid-state battery having the overheat self-protection function comprises a positive electrode, a negative electrode and a composite solid-state electrolyte positioned between the positive electrode and the negative electrode, and the composite solid-state electrolyte comprises a solid-state ion conductor material and an insulating thermal expansion material. The solid-state battery mainly aims at the characteristic that the electrolyte of the solid-statebattery does not flow, and the characteristic that the volume of an insulated solid thermal expansion material is expanded under a high-temperature condition is utilized. When the battery is locallyoverheated, the thermal expansion material corresponding to the local area is subjected to volume expansion, so the ion conduction impedance inside the composite solid electrolyte increases sharply, the internal current of the battery drop sharply, continued heating is prevented, and the self-protection effect of the battery in the case of overheating is achieved; and when the temperature of the battery is reduced, the thermal expansion material is recovered to the initial state, and the ion path of the region is recovered.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a solid-state battery with an overheating self-protection function. Background technique [0002] At present, lithium-ion batteries, including power batteries, have relatively large safety hazards during use, such as fire, combustion, explosion and other events. Relatively speaking, the safety of solid-state batteries using solid-state electrolytes can be significantly improved. However, solid-state batteries still have the risk of thermal runaway. So far, there are relatively few preventive measures for thermal runaway of solid-state batteries. Contents of the invention [0003] The purpose of the present invention is to solve the safety problem caused by the overheating of the solid-state battery, and provide a solid-state battery with an overheating self-protection function. [0004] In order to achieve the above object, the technical scheme that the present invention takes is as f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M10/0525H01M10/054H01M10/0562H01M10/42
CPCH01M10/0525H01M10/054H01M10/0562H01M10/4235H01M2300/0068H01M2300/0088H01M2200/10H01M50/581Y02E60/10
Inventor 高云智晁广召付传凯刘松松吴李斌
Owner HARBIN INST OF TECH
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