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Lithium secondary battery

A lithium secondary battery and electrode technology, applied in secondary batteries, lithium storage batteries, battery electrodes, etc., can solve problems such as heat concentration and deterioration, and achieve the effects of improving weight energy density, inhibiting deterioration, and stabilizing development goals

Inactive Publication Date: 2020-09-22
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium secondary batteries have a structure in which positive electrodes and negative electrodes are alternately stacked with separators interposed therebetween, so there is a problem that heat tends to concentrate in the center of the electrode assembly and deterioration tends to be accelerated.

Method used

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no. 1 approach ＞

[0031] figure 1 is a schematic cross-sectional view of lithium secondary battery 1 according to the first embodiment of the present invention.

[0032] Such as figure 1 As shown, the lithium secondary battery 1 of the first embodiment includes an electrode assembly C, an exterior body 40 that houses the electrode assembly C in a hermetically sealed state, and a pair of terminal electrodes 41 and 42 drawn out from the exterior body 40 . In addition, although not shown, a non-aqueous electrolytic solution is sealed together with the electrode assembly C in the exterior body 40 .

[0033] The electrode assembly C has a structure in which positive electrodes 10 and negative electrodes 20 are alternately stacked with a separator 30 interposed therebetween. figure 1 In the illustrated example, three positive electrodes 10 and three negative electrodes 20 are laminated, but the number of positive electrodes 10 and negative electrodes 20 is not limited to this. Also, it is not nece...

no. 2 approach ＞

[0064] image 3 is a schematic cross-sectional view of a lithium secondary battery 2 according to a second embodiment of the present invention.

[0065] Such as image 3As shown, the difference between the lithium secondary battery 2 of the second embodiment and the lithium secondary battery 1 of the first embodiment is that the heat release layers 51 and 52 of the former are in contact with the electrode assembly C and the exterior body 40 structure. The rest of the structure of the lithium secondary battery 2 of the second embodiment is the same as that of the lithium secondary battery 1 of the first embodiment, and therefore, the same reference numerals are assigned to the same elements, and overlapping descriptions are omitted.

[0066] As exemplified in this embodiment, in the present invention, the heat dissipation layer may be in contact with the electrode assembly and the exterior body. Accordingly, the heat inside the electrode assembly is efficiently dissipated to...

no. 3 approach ＞

[0068] Figure 4 is a schematic cross-sectional view of a lithium secondary battery 3 according to a third embodiment of the present invention.

[0069] Such as Figure 4 As shown, the lithium secondary battery 3 of the third embodiment is different from the lithium secondary battery 2 of the second embodiment in that the former has an adhesive layer 61 between the heat release layers 51 and 52 and the exterior body 40 , 62. Other configurations of the lithium secondary battery 3 of the third embodiment are the same as those of the lithium secondary battery 2 of the second embodiment, and therefore, the same reference numerals are assigned to the same elements, and overlapping descriptions are omitted.

[0070] As exemplified in this embodiment, in the present invention, another layer such as an adhesive layer may be provided between the heat release layer and the electrode assembly.

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Abstract

The problem to be solved by the present invention is to suppress degradation of an electrode assembly due to heat in a lithium secondary battery in which the gravimetric energy density is greatly improved compared to a conventional lithium secondary battery. This lithium secondary battery (1) is provided with: an electrode assembly (C) having a structure in which positive electrodes (10) and negative electrodes (20) are alternately stacked with separators (30) interposed therebetween, and having a gravimetric energy density of 250 Wh / Kg or more; and heat dissipation layers (51, 52) provided onthe surface of the electrode assembly (C). Compared with a common lithium secondary battery, the heat generation of the central part of the electrode assembly (C) is very large. However, since the lithium secondary battery (1) is provided with heat rejection layers (51, 52) on the surface of the electrode assembly (C), the thermal gradient between the center portion of the electrode assembly (C)and the heat rejection layers (51, 52) is increased, and heat concentrated in the center portion of the electrode assembly (C) can be efficiently dissipated to the outside. The present invention is useful for stably supplying energy, i.e., achieving sustainable development goals.

Description

technical field [0001] The present invention relates to a lithium secondary battery, in particular to a lithium secondary battery with increased gravimetric energy density by using silicon (Si), tin (Sn), lithium (Li) or their oxides as negative electrode active materials. Background technique [0002] In recent years, lithium secondary batteries have been put into practical use as secondary batteries exhibiting high output and high energy density. The energy density, cycle characteristics, input and output characteristics, and storage characteristics of lithium secondary batteries are superior to those of existing secondary batteries. universal. [0003] As described in Patent Document 1, in common lithium secondary batteries, graphite is used as a negative electrode active material. The theoretical capacity of graphite is 372mAh / g. In recent years, in order to further increase the energy density compared with ordinary lithium secondary batteries that use graphite as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0585H01M10/613H01M10/654H01M10/655
CPCH01M10/0585H01M10/052H01M10/613H01M10/654H01M10/655H01M10/6551H01M10/0525Y02E60/10H01M50/24Y02P70/50H01M2004/027H01M2004/028H01M4/134H01M50/46
Inventor 平川悟高木靖博井上亨
Owner TDK CORPARATION
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