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Lithium secondary battery

A lithium secondary battery and electrolyte technology, applied in secondary batteries, lithium batteries, battery electrodes, etc.

Pending Publication Date: 2021-11-19
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a large room for improvement in the capacity and charge-discharge efficiency of the powder-dispersed positive electrode.

Method used

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Examples

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Embodiment

[0083] The present invention will be further specifically described using the following examples. It should be noted that in the following example, LiCoO 2 Abbreviated as "LCO", the Li 4 Ti 5 o 12 Abbreviated as "LTO".

[0084] Example A1

[0085] (1) Production of LCO green sheet (positive electrode green sheet)

[0086] First, the Co weighed in such a way that the Li / Co molar ratio is 1.01 3 o 4 Powder (manufactured by Zhengdo Chemical Industry Co., Ltd.) and Li 2 CO 3 Powders (manufactured by Honjo Chemical Co., Ltd.) were mixed and held at 780° C. for 5 hours, and the resulting powder was pulverized by a pot mill so that the volume basis D50 was 0.4 μm to obtain a powder containing LCO plate-like particles. 100 parts by weight of the obtained LCO powder, 100 parts by weight of a dispersion medium (toluene:isopropanol=1:1), a binder (polyvinyl butyral: model BM-2, manufactured by Sekisui Chemical Co., Ltd.) 10 parts by weight, 4 parts by weight of plasticizer (D...

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Abstract

Provided is a lithium secondary battery of an integrally sintered body plate type where a positive electrode layer, a ceramic separator, and a negative electrode layer are mutually integrated, the lithium secondary battery, despite this configuration, still being capable of suppressing separation between layers of the integrated sintered plate caused by the exposure to a physical impact applied when the battery is assembled, and capable of suppressing capacity deterioration that can occur when the battery is stored in a charged state. This lithium secondary battery comprises: a positive electrode layer constituted of a lithium complex oxide sintered body; a negative electrode layer constituted of a titanium-containing sintered body; a ceramic separator interposed between the positive electrode layer and the negative electrode layer; an electrolyte impregnated at least into the ceramic separator; and a sealed space. In the sealed space, provided are the positive electrode layer, the negative electrode layer, the ceramic separator, and an exterior body accommodating the electrolyte. The positive electrode layer, the ceramic separator and the negative electrode layer together form one integrated sintered body plate, and the entirety of the integrated sintered body plate is coated with a metal oxide layer.

Description

technical field [0001] The present invention relates to lithium secondary batteries. Background technique [0002] Lithium secondary batteries are widely used in various devices requiring charging. In many existing lithium secondary batteries, a powder-dispersed positive electrode (so-called coated positive electrode) made by coating and drying a positive electrode mixture including a positive electrode active material, a conductive additive, a binder, etc. is used. cloth electrodes). [0003] Generally, a powder-dispersed positive electrode contains a relatively large amount (for example, about 10% by weight) of components (binders, conductive additives) that do not contribute to capacity, so the packing density of the lithium composite oxide that is the positive electrode active material will decrease. . Therefore, there is a large room for improvement in the capacity and charge-discharge efficiency of the powder-dispersed positive electrode. Therefore, attempts have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/485H01M4/525H01M10/052H01M10/0525H01M10/0585H01M50/434H01M50/409H01M50/491
CPCH01M10/052H01M4/525H01M4/485H01M10/0585H01M4/131Y02E60/10Y02P70/50H01M50/434H01M2004/021H01M4/366H01M4/628H01M50/109H01M50/409H01M50/491H01M50/46H01M4/58H01M10/0525H01M2004/029
Inventor 岩花美香子田岛正德由良幸信
Owner NGK INSULATORS LTD
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