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Lithium-ion battery

A lithium-ion battery and lithium-ion technology, applied to secondary batteries, battery components, circuits, etc., can solve problems such as fire, poor OCV, and heat

Active Publication Date: 2017-05-10
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a short circuit causes OCV (Open Circuit Voltage) failure in which the output voltage drops, which in turn causes heat generation and ignition failure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a cross-sectional view showing the configuration of a cylindrical lithium ion battery as one embodiment of the present invention. figure 1 The cylindrical lithium ion battery illustrated in , includes positive electrode plates 1 and negative electrode plates 2 , and the positive electrode plates 1 and the negative electrode plates 2 are alternately stacked. Between the positive electrode plate 1 and the negative electrode plate 2 , a spacer 3 is disposed to prevent the positive electrode plate 1 from being in physical contact with the negative electrode plate 2 . The stacked positive electrode plate 1, negative electrode plate 2, and separator 3 are wound into a cylindrical shape, and are arranged in a case 6 having a positive electrode joint 4, a negative electrode joint 5, an electrolyte solution 7, etc. to form a cylindrical lithium battery. ion battery. The electrolytic solution 7 is composed of, for example, a solution in which a lithium salt is di...

Embodiment 1

[0048] In Embodiment 1, in the positive electrode active material 1a, iron, copper, zinc, tin, cobalt, nickel, and chromium with a diameter of φ20 μm or more and 30 μm or less are prepared as metal foreign substances mixed with 100 ppm of the mass of the positive electrode active material 1a, respectively. Lithium ion battery, it is used as embodiment 1. At this time, as the spacer 3 , a spacer in which the separation function layer 3 a is not arranged on the side wall 10 of the support layer 3 b is used.

[0049] That is, the spacer 3 in Example 1 is as image 3 As shown, the separation function layer 3a is only in contact with the negative electrode plate 2 on the first surface 8 of the spacer 3 that becomes the surface, and the support layer 3b is in contact with the positive electrode plate 1 only on the second surface 9 of the spacer 3 that becomes the surface. catch. Therefore, no separation function layer 3 a is formed at the positions of the support layer 3 b adjoini...

Embodiment 2

[0051] In Embodiment 1, in the positive electrode active material 1a, iron, copper, zinc, tin, cobalt, nickel, and chromium with a diameter of φ20 μm or more and 30 μm or less are mixed as metal foreign substances into 100 ppm of lithium with respect to the mass of the positive electrode active material 1a. An ion battery is used as Example 2. At this time, if Figure 4 As shown, as the spacer 3 , a spacer arranged so that the separation function layer 3 a is also in contact with the side wall 10 of the support layer 3 b is used. That is, the separation function layer 3a is formed at a position in contact with the negative electrode plate 2 and the side wall 10 of the supporting layer 3b.

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Abstract

The purpose of the invention is to ensure the battery performance and safety of the lithium ion batteries. A separator 3 includes a separation functional layer 3a and a support layer 3b. The separation functional layer 3a is configured as a denser layer with a smaller pore size and a lower porosity than the support layer 3b. Accordingly, movement of metal foreign objects from the positive electrode plate 1 side to the negative electrode plate 2 side, and precipitation of metal foreign objects on the negative electrode plate 2 side can be inhibited, thereby making it possible to ensure battery performance and safety.

Description

technical field [0001] The present invention relates to a lithium ion battery provided with a separator between a positive electrode and a negative electrode. Background technique [0002] A lithium ion battery is provided with a positive electrode containing a lithium transition metal oxide as an active material, a negative electrode containing carbon as an active material, an electrolytic solution containing an organic solvent in which a lithium salt is dissolved, and a separator arranged between the positive electrode and the negative electrode composition. [0003] Metal foreign matter such as iron, copper, zinc, tin, cobalt, nickel, and chromium may be mixed into the electrodes of lithium-ion batteries. The mixed metal foreign matter may be mixed into the battery in the state of solid or ion. Lithium-ion batteries may have lower output voltage, heat generation, or fire failure due to metal foreign matter mixed in. In particular, when metallic foreign matter is mixed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M2/16
CPCH01M10/0525H01M10/0587H01M50/449Y02E60/10Y02P70/50
Inventor 宍田佳谦伊达健二黑宫孝雄
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD