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Solid electrolyte separator, secondary battery, battery pack, and vehicle

A technology of solid electrolyte and solid electrolyte layer, which is applied in the direction of solid electrolyte, secondary battery, battery/battery traction, etc., can solve the problem of easy decline in lithium ion conductivity, and achieve the effect of excellent cycle life characteristics

Active Publication Date: 2019-03-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the lithium ion conductivity between the positive electrode and the negative electrode of the all-solid secondary battery tends to decrease, an electrolyte solution may be used depending on the structure of the battery.

Method used

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  • Solid electrolyte separator, secondary battery, battery pack, and vehicle
  • Solid electrolyte separator, secondary battery, battery pack, and vehicle
  • Solid electrolyte separator, secondary battery, battery pack, and vehicle

Examples

Experimental program
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no. 1 Embodiment approach

[0032] According to the first embodiment, a solid electrolyte separator is provided. The solid electrolyte separator is a sheet containing a solid electrolyte having lithium ion conductivity. The first lithium ion conductivity of the peripheral region along the in-plane direction of the sheet is lower than the second lithium ion conductivity of the central region along the in-plane direction of the sheet.

[0033] Conventionally, in order to prevent the positive electrode and the negative electrode from coming into contact, for example, a laminated electrode group is formed in which a separator is sandwiched between the positive electrode and the negative electrode. As the separator, for example, a synthetic resin nonwoven fabric containing a polymer material can be used, but such a separator generally has no or very low ion conductivity. Therefore, in order to transfer carriers such as lithium ions between the positive electrode and the negative electrode, for example, an el...

no. 2 Embodiment approach

[0084] According to the second embodiment, a secondary battery is provided. This secondary battery includes a first electrode as one of a positive electrode and a negative electrode, a second electrode as the other of the positive electrode and the negative electrode, and a solid electrolyte layer including the solid electrolyte separator of the first embodiment. This secondary battery includes, for example, a first electrode as a negative electrode, a second electrode as a positive electrode, and a solid electrolyte layer including the solid electrolyte separator of the first embodiment.

[0085] The secondary battery may contain one solid electrolyte layer or a plurality of solid electrolyte layers. There is, for example, one solid electrolyte layer between the positive electrode and the negative electrode.

[0086] A secondary battery according to an embodiment will be described with reference to the drawings.

[0087] Figure 4 It is a perspective view schematically sho...

no. 3 Embodiment approach

[0230] According to the third embodiment, a battery pack is provided. This battery pack includes the secondary battery of the second embodiment. This battery pack may include one secondary battery according to the second embodiment, or may include a battery module including a plurality of secondary batteries.

[0231] The battery pack of the embodiment may further include a protection circuit. The protection circuit has a function of controlling charge and discharge of the secondary battery. Alternatively, a circuit included in a device using a battery pack as a power source (for example, electronic equipment, a vehicle, etc.) may also be used as a protection circuit for the battery pack.

[0232] In addition, the battery pack according to the embodiment may further include an external terminal for conducting electricity. The external terminals for energization are used to output current from the secondary battery to the outside and / or input current to the secondary battery...

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Abstract

The invention relates to a solid electrolyte separator, a secondary battery, a battery pack and a vehicle, and particularly, the invention provides the solid electrolyte separator which can realize excellent cycle life characteristic, the secondary battery with the solid electrolyte separator, the battery pack with the secondary battery, and the vehicle with the battery pack. According to one embodiment, the solid electrolyte separator is provided. The solid electrolyte separator is a sheet containing a solid electrolyte having a lithium ion conductivity. A first lithium ion conductivity in aperipheral edge region along an in-plane direction of the sheet is lower than a second lithium ion conductivity in a central region along the in-plane direction of the sheet.

Description

technical field [0001] Embodiments of the present invention relate to a solid electrolyte separator, a secondary battery, a battery pack, and a vehicle. Background technique [0002] Non-aqueous electrolyte secondary batteries including a positive electrode and a negative electrode capable of occluding / releasing lithium ions are widely used in various fields such as electric vehicles, power storage, and information equipment as batteries with high energy density. Along with this, the demand from the market is increasing day by day, and active research is currently being carried out. [0003] In the application of non-aqueous electrolyte secondary batteries to power sources for electric vehicles, high energy density, that is, high discharge capacity per unit weight or unit volume is required. [0004] On the other hand, the larger the discharge capacity per unit weight or unit volume, the more problematic the safety is, and a secondary battery having further excellent safety...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/056H01M10/0562H01M10/0565B60L50/64
CPCH01M10/0525H01M10/056H01M10/0562H01M10/0565H01M2300/0065H01M2220/20H01M50/40H01M50/271B60L50/64H01M50/209H01M50/249H01M8/1246Y02E60/10Y02E60/50Y02T10/7072Y02T10/70Y02T90/14Y02P70/50H01M4/485H01M10/425H01M10/46B60L7/10H01M2004/027H01M2300/0091H01M2300/0082H01M2300/0071H02J7/14B60L53/00
Inventor 杉崎知子岸敬原田康宏高见则雄
Owner KK TOSHIBA