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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in the direction of secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of diaphragm failure, short circuit, etc., and achieve the effect of solving oxidation and deterioration

Inactive Publication Date: 2018-03-27
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the diaphragm cannot maintain its function and causes a further short circuit

Method used

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  • Lithium-ion secondary battery
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0114] The preparation of positive and negative electrodes will be briefly explained. First, if Image 6 As shown, an active material layer 211 is coated on an elongated metal foil 201 .

[0115] Then, if Figure 7 As shown, an insulating layer 215 is coated to cover the active material layer 211 . It should be noted, Image 6 coating process and Figure 7 The coating process can be carried out simultaneously.

[0116] After that, in the slitting process, the metal foil 201 is cut in the longitudinal direction along the lines L1 and L2, and cut into metal foils 201A, 201B, and 201C.

[0117] Next, if Figure 8 As shown, a punching process is performed on metal foils 201A- 201C to obtain electrodes 30 . The electrode 30 has a substantially square shape as a whole, and has a protruding portion 31a on a part of its outer periphery. The protruding portion 31a is a portion for electrical connection and is formed substantially without an active material layer or an insulatin...

Embodiment 1

[0131] The manufacture of the battery of this example will be described.

[0132] (positive electrode)

[0133] Weigh the lithium-nickel composite oxide (LiNi 0.80 mn 0.15 co 0.05 o 2 ), carbon black as a conductive auxiliary material, and polyvinylidene fluoride as a binder. These were kneaded using N-methylpyrrolidone to prepare positive electrode slurry. The prepared positive electrode slurry was applied on an aluminum foil having a thickness of 20 μm as a current collector, dried and further pressed to obtain a positive electrode.

[0134] Next, alumina (average particle diameter: 1.0 μm) and polyvinylidene fluoride as a binder were weighed in a weight ratio of 90:10. These were kneaded using N-methylpyrrolidone to prepare a slurry for an insulating layer. The slurry was coated on the positive electrode with a gravure coater, dried and further pressed to obtain an insulating layer. When the cross section was observed with an electron microscope, the thickness of th...

Embodiment 2

[0152] The insulating particles used for the insulating layer were silicon dioxide (average particle diameter: 1.0 μm). Except for this, batteries were produced and evaluated under the same conditions as in Example 1. The results are shown in Table 1.

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Abstract

Provided is a lithium-ion secondary battery in which positive terminals 30 and negative terminals 40 are alternately laminated with a separator 25 interposed therebetween. Each separator 25 is a single layer that does not melt or soften at at least 200 DEG C and that has a heat shrinkage rate of 3% or less. An insulation layer 70 is formed on the surfaces of each positive terminal 30, and the surfaces are those that face the separators 25.

Description

technical field [0001] The present invention relates to a secondary battery, in particular to a lithium-ion secondary battery with high safety and high energy density, in which the internal short circuit caused by oxidation and deterioration of a high heat-resistant diaphragm caused by a high-potential positive electrode can be solved etc. to cause a problem that may impair the safety of the lithium battery. Background technique [0002] Lithium ion secondary batteries are characterized by their small size and large capacity. Accordingly, lithium ion secondary batteries have been widely used as power sources for electronic devices such as mobile phones and notebook computers, and have helped improve the convenience of portable IT equipment. In recent years, the focus has shifted to use in large-scale applications such as power sources for driving motorcycles or cars and storage batteries for smart grids. Demand for lithium ion secondary batteries has increased and lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/13H01M10/052H01M10/0585H01M50/414H01M50/423
CPCH01M4/13H01M10/0585H01M4/62H01M10/0463H01M10/4235H01M10/0525Y02E60/10H01M50/44Y02P70/50H01M50/414H01M50/423H01M50/4295H01M4/485H01M4/505H01M4/525H01M4/583H01M4/623H01M2004/027H01M2004/028
Inventor 井上和彦吉田登志村健一
Owner NEC CORP