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Lithium-ion cell

A lithium-ion battery and lithium metal film technology, which is applied to lithium batteries, secondary batteries, battery electrodes, etc., can solve the problem that the battery capacity cannot reach the expected value, achieve no leakage test defects, suppress internal short circuits, and have excellent cycle characteristics Effect

Active Publication Date: 2015-11-18
PANASONIC ENERGY CO LTD MORIGUCHI SHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The irreversible capacity of negative electrode active materials composed of metal materials alloyed with lithium and oxides of the above metals is larger than that of carbonaceous materials, so there is a problem that the battery capacity does not reach the expected value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0023] The lithium ion battery of Experimental Example 1 was fabricated as follows.

[0024] (production of positive electrode)

[0025] The lithium cobalt composite oxide (LiCoO 2 ) 100 parts by mass, 1.5 parts by mass of acetylene black, 1.5 parts by mass of polyvinylidene fluoride and an appropriate amount of N-methylpyrrolidone (NMP) were mixed together in a mixer to prepare a positive electrode mixture slurry.

[0026] This positive electrode mixture slurry is applied to both sides of a positive electrode current collector sheet made of Al foil with a thickness of 15 μm, dried, and cut into a battery case made of a predetermined laminate material after rolling. Corresponding size, thereby obtaining the positive electrode used in the lithium-ion battery of Experimental Example 1. The charge capacity of the positive electrode is 3.6mAh / cm 2 .

[0027] (production of negative electrode)

[0028] The average particle size (D 50 ) 10 parts by mass of SiO particles of 6 μ...

experiment example 2

[0038] The lithium ion battery of Experimental Example 2 has the same configuration as that of Experimental Example 1, except that the insulating tape 19 is not attached, and the separator formed with a lithium metal film is formed around one more turn.

experiment example 3

[0040] As the lithium ion battery of Experimental Example 3, except that the insulating tape 19 was not pasted on the positive electrode current collector, and the lithium metal film was removed from the end surface of the outermost periphery of the separator, the same structure as that of Experimental Example 1 was produced. constitute.

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Abstract

The purpose is to suppress leak test defects in which positive and negative electrodes short-circuit through lithium metal present in the vicinity of the end part of the separator, and improve the cycle characteristics and the initial charge / discharge efficiency of a lithium-ion cell. Provided is a lithium-ion cell provided with: a positive electrode plate including a positive electrode collector and a positive electrode active material layer formed on the surface of the positive electrode collector; a negative electrode plate including a negative electrode collector and a negative electrode active material formed on the surface of the negative electrode collector; a separator for separating the positive electrode plate and the negative electrode plate; and a non-aqueous electrolytic solution containing a non-aqueous solvent and an electrolytic salt; the separator having a polyolefin as a principal material and having a uniform lithium metal film formed on the portion on the negative-electrode-plate-side surface that does not face the negative electrode active material layer, the lithium metal film being electrically insulated from the positive electrode collector.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a separator for the lithium ion battery. Background technique [0002] For the high energy density and high output of lithium-ion batteries, metal materials alloyed with lithium such as silicon, germanium, tin, and zinc, or oxides of the above metals, etc., are being studied instead of carbonaceous materials such as graphite as negative electrode active materials. substance. [0003] The negative electrode active material composed of metal materials alloyed with lithium and oxides of the above metals, for example, if it is silicon, can intercalate lithium until the composition of Li 4.4 Si, therefore, has a larger theoretical capacity than graphite-based carbonaceous materials that can intercalate lithium up to LiC6. [0004] It should be noted that no matter which negative electrode active material is used, lithium from the positive electrode active material is absorbed into the negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/16H01M4/36H01M10/052H01M10/0566H01M50/417H01M50/431H01M50/449
CPCH01M10/0525H01M2/1646H01M2/1653H01M2/1686H01M10/0587Y02E60/122Y02T10/7011Y02E60/10H01M50/431H01M50/449Y02P70/50H01M50/417Y02T10/70
Inventor 平冈树
Owner PANASONIC ENERGY CO LTD MORIGUCHI SHI
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