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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of battery performance degradation, spacer ion conductivity reduction, etc., and achieve resistance to external stress Excellent, improved detection sensitivity, improved internal pressure rise effect

Active Publication Date: 2014-06-18
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in a nonaqueous electrolyte secondary battery using a porous resin film made of polyolefin or the like as a separator, when stress is applied from the outside, the nonaqueous electrolyte is squeezed out from the separator, and as a result, the ion conductivity of the separator decreases. , battery performance may decrease (paragraph [0004] of Patent Document 2)

Method used

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Experimental program
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Embodiment 1～9、 comparative example 1～5）

[0108]

[0109] As the positive electrode active material, a ternary lithium composite oxide represented by the following formula was used.

[0110] LiMn 1 / 3 co 1 / 3 Ni 1 / 3 o 2 .

[0111]

[0112] Using N-methyl-2-pyrrolidone (manufactured by Wako Pure Chemical Industries, Ltd.) as a dispersant, the above-mentioned positive electrode active material and acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd. HS-100) as a conductive agent , PVDF (manufactured by KUREHA Co., Ltd. KF Polymer #1120) as a binder was mixed at a ratio of 90 / 6 / 4 (mass ratio) to obtain a slurry.

[0113] The above-mentioned slurry was coated on an aluminum foil serving as a current collector by a doctor blade coating method, dried at 150° C. for 30 minutes, and press-processed using a press to obtain a positive electrode. Positive pole mass per unit area 10mg / cm 2 , thickness 50 μm.

[0114]

[0115] Graphite was used as the negative electrode active material.

[0116] Using water as...

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Abstract

Provided is a nonaqueous electrolyte secondary battery which has excellent resistance to external stress and is capable of increasing the sensitivity of detecting an increase of the internal pressure at the time of overcharging without lowering battery performances such as battery capacity. This nonaqueous electrolyte secondary battery comprises: a positive electrode (21); a negative electrode (22); a porous heat-resistant layer (24) that is arranged between the positive electrode (21) and the negative electrode (22) and contains an insulating inorganic filler and a binder; a nonaqueous electrolyte to which an overcharge inhibitor that is decomposed and generates protons when overcharged is added; and a current blocking mechanism which interrupts the charging when the internal pressure of the battery reaches a predetermined value or higher during the charging. At least some of the insulating inorganic filler in the porous heat-resistant layer (24) is configured of a proton-conducting ceramic material.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] A conventional nonaqueous electrolyte secondary battery such as a lithium ion secondary battery is roughly composed of a positive electrode, a negative electrode, a separator for insulating them, and a nonaqueous electrolyte. As the separator, porous resin films such as polyolefin-based films are widely used. [0003] In non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries, as a safety measure during overcharging, there are cases in which a current blocking mechanism that blocks charging when the internal pressure of the battery reaches a predetermined value or more during charging (for example, [ 0094] paragraph). [0004] In Patent Document 1, in order to improve the detection sensitivity of an increase in internal pressure, an overcharge preventing agent that decomposes during overcharging to generate protons is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/16H01M2/34H01M4/13H01M10/0525H01M10/0567H01M50/443H01M50/451H01M50/574
CPCH01M10/058H01M4/13H01M10/0567H01M2/16H01M10/0525H01M2/345H01M2/34Y02T10/7011Y02E60/122H01M50/461H01M50/578H01M50/451H01M50/574H01M50/443H01M10/4235Y02E60/10H01M50/446Y02P70/50H01M50/434H01M10/0563H01M2200/20Y02T10/70
Inventor 高木优
Owner TOYOTA JIDOSHA KK
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