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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of large volume expansion and contraction, battery tank expansion, and negative electrode capacity increase, so as to improve charge and discharge Effects of Cyclic Properties

Active Publication Date: 2021-10-22
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] It can be seen that the above-mentioned SiO is also known x The volume expansion and contraction accompanying the charge-discharge reaction is large, so the silicon particles are crushed in each charge-discharge cycle of the battery, and the Si precipitated on the surface of the negative electrode reacts with the non-aqueous electrolyte solvent to cause an irreversible increase in the capacity of the negative electrode. This reaction generates gas in the battery, causing problems such as expansion of the battery can

Method used

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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a cross-sectional view illustrating the configuration of a lithium ion secondary battery.

[0029] Such as figure 1 As shown, the lithium ion secondary battery 10 of the present invention is composed of, for example, an electrode body including a positive electrode plate 11, a negative electrode plate 12, and a separator 13; a non-aqueous electrolytic solution 14; and a case 15 for accommodating them.

[0030] In the lithium ion secondary battery 10 of the present invention, the above-mentioned positive electrode plate 11, separator 13, non-aqueous electrolyte solution 14, and case 15 are not particularly limited, and for example, materials described below can be used.

[0031] The positive electrode plate 11 includes a positive electrode current collector and a positive electrode mixture layer provided on at least one surface of the positive electrode cur...

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Abstract

The present invention provides a lithium ion secondary battery having excellent charge-discharge cycle characteristics. At least a part of the negative electrode active material 3 a , which is a constituent material of the negative electrode mixture layer 2 , has a flat surface 8 on its surface, thereby improving charge-discharge cycle characteristics.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery comprising a negative electrode plate and a positive electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode mixture layer. Background technique [0002] In recent years, lithium-ion secondary batteries have been practically used as power sources for driving mobile electronic devices such as mobile phones, notebook personal computers, and mobile phones as secondary batteries with high operating voltage and high energy density. In addition, lithium-ion secondary batteries have achieved rapid growth, and as a battery system leading small secondary batteries, the production volume has continued to increase. [0003] Recently, the demand for lithium-ion secondary batteries has increased not only in these small consumer applications but also in automotive batteries, and the development of lithium-ion secondary batteries with high e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525H01M4/133H01M4/134
CPCH01M4/133H01M4/134H01M4/364H01M4/386H01M4/587H01M10/0525H01M4/13Y02E60/10
Inventor 高桥美枝黑宫孝雄
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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