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Secondary battery, composite electrolyte, battery pack, and vehicle

A composite electrolyte and secondary battery technology, which is applied in the fields of secondary batteries, composite electrolytes, battery packs, and vehicles, and can solve the problems of reduced battery cycle life performance, increased interface impedance between electrodes and solid electrolytes, and obstacles to the practical use of secondary batteries, etc. problem, to achieve the effect of good charge and discharge cycle life and low temperature performance

Active Publication Date: 2017-08-18
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the interface resistance between the electrode and the solid electrolyte is large, there is a problem that the discharge performance and the low-temperature performance are greatly reduced.
In addition, during the charge-discharge cycle, since the bonding strength between the electrode and the solid electrolyte decreases, the interface impedance between the electrode and the solid electrolyte increases, and the cycle life performance of the battery decreases.
These problems hinder the practical use of secondary batteries using solid electrolytes

Method used

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  • Secondary battery, composite electrolyte, battery pack, and vehicle
  • Secondary battery, composite electrolyte, battery pack, and vehicle
  • Secondary battery, composite electrolyte, battery pack, and vehicle

Examples

Experimental program
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no. 1 Embodiment approach

[0020] According to the first embodiment, a composite electrolyte containing lithium-containing oxide particles and an electrolyte composition is provided. Utilization of lithium-containing oxide particlesN 2 The specific surface area obtained by the BET adsorption method is 10m 2 / g or more and 500m 2 / g or less. The ratio of the lithium-containing oxide particles in the composite electrolyte is not less than 90% by weight and not more than 98% by weight. The electrolyte composition contains lithium ions, an organic solvent and a polymer.

[0021] The present inventor has studied and understood that the use of N 2 The specific surface area obtained by the BET adsorption method is 10-500m 2 / g of the lithium-containing oxide particles and the composite electrolyte of the electrolyte composition, the lithium ion conductivity of the lithium-containing oxide particles is improved. The reason for this is presumed to be as described below. The lithium-containing oxide partic...

no. 2 Embodiment approach

[0047] According to the second embodiment, there is provided a secondary battery including a layer containing a positive electrode active material, a layer containing a negative electrode active material, and a composite electrolyte. The composite electrolyte exists between the positive electrode active material layer and the negative electrode active material layer. As the composite electrolyte, the composite electrolyte of the first embodiment was used.

[0048] The secondary battery of the embodiment includes a non-aqueous electrolyte secondary battery and a bipolar secondary battery. In addition, the secondary battery of the embodiment can be applied to secondary batteries in various forms such as square, cylindrical, flat, thin, and coin-shaped. A secondary battery having a bipolar structure is preferred. Thereby, there is an advantage that a single cell having a voltage equivalent to that of a battery pack in which a plurality of unit cells are connected in series can ...

no. 3 Embodiment approach

[0114] The battery pack of the third embodiment may include one or more secondary batteries (cells) of the second embodiment. A plurality of non-aqueous electrolyte batteries can also be electrically connected in series, in parallel, or a combination of series and parallel to form a battery pack. The battery pack of the third embodiment may include a plurality of battery packs.

[0115] The battery pack of the third embodiment may further include a protection circuit. The protection circuit has a function of controlling charge and discharge of the nonaqueous electrolyte battery. Alternatively, a circuit included in a device using a battery pack as a power source (for example, an electronic device, an automobile, etc.) may be used as a protection circuit for the battery pack.

[0116] In addition, the battery pack according to the third embodiment may further have external terminals for conducting electricity. The external terminal for energization is used to output current ...

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Abstract

According to one embodiment, a composite electrolyte includes lithium-containing oxide particles and an electrolytic composition. A content of the lithium-containing oxide particles in the composite electrolyte falls within a range of from 90% by weight to 98% by weight. A specific surface area of the lithium-containing oxide particles falls within a range of 10 m 2 / g to 500 m 2 / g and is measured by a BET adsorption method using N2. The electrolytic composition includes lithium ions, an organic solvent and a polymer. The invention also provides a secondary battery, a battery pack, and a vehicle.

Description

technical field [0001] Embodiments relate to secondary batteries, composite electrolytes, battery packs, and vehicles. Background technique [0002] Nonaqueous electrolyte batteries containing lithium metal, lithium alloys, lithium compounds, or carbon materials in their negative electrodes are expected as high energy density batteries. Therefore, the battery is being actively researched and developed. So far, with LiCoO as the active material 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 or LiMn 2 o 4 A lithium-ion battery with a positive electrode and a negative electrode containing a carbon material that intercalates / deintercalates lithium is widely used. In addition, research on metal oxides or alloys to replace carbon species in negative electrodes has been ongoing. [0003] Especially when mounted on vehicles such as automobiles, chemical and electrochemical stability, strength, and corrosion resistance are required for the constituent materials of the negative electrode in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566
CPCH01M10/0566H01M2300/0025H01M2300/0088H01M2220/20H01M4/405H01M4/48H01M4/5815H01M4/583H01M10/0525H01M10/0562H01M10/0565H01M10/0567H01M10/056H01M2300/0091Y02E60/10Y02P70/50Y02T10/70
Inventor 高见则雄吉间一臣原田康宏
Owner KK TOSHIBA