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Lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve technical difficulties and other problems, and achieve the effects of reducing manufacturing costs, miniaturization costs, and reducing costs

Active Publication Date: 2012-12-26
NAMICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the case of the all-solid small battery described in Patent Document 1, which is produced by a series of sintering, it is technically very difficult to provide markings for identifying the positive and negative electrodes on the surface of the battery itself.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0166] The present invention will be described in detail below using examples. However, the present invention is not limited to these Examples. In addition, a part means a weight part unless otherwise indicated.

[0167] (making active substances)

[0168] The active material used Li produced by 2 MnO 3 .

[0169] With Li 2 CO 3 and MnCO 3 Weigh the starting materials so that their substance content ratio is 2:1. These materials were wet-mixed for 16 hours with a ball mill using water as a solvent, and then dehydrated and dried. The obtained powder was pre-fired at 800°C in air for 2 hours. Coarsely pulverize the calcined piece, wet-mix with water as a solvent with a ball mill for 16 hours, and then dehydrate and dry to obtain active material powder. The average particle diameter of this powder was 0.40 μm. Using an X-ray diffraction device, it was confirmed that the powder component produced was Li 2 MnO 3 .

[0170] (making active material slurry)

[0171] 15 ...

Embodiment 2）

[0189] An all-solid secondary battery was produced by the same manufacturing process as in Example 1, except that only the active material mixed current collector slurry was coated on the inorganic solid electrolyte sheet and dried to form an active material unit. The thickness of the active material mixed current collecting electrode of the produced battery was 7 μm.

[0190] A series of sintered batteries have an appearance size of 3.7mm×3.2mm×0.35mm.

[0191] (Evaluation of battery characteristics)

[0192] Lead wires were attached to each terminal electrode, and charge and discharge tests were repeated. The measurement conditions are as follows. That is, the current at both charge and discharge was set to 0.1 μA. In addition, the cut-off voltages at the time of charging and at the time of discharging were 4.0V and 0.5V, respectively. The results are shown in Figure 7 . From the results, it was confirmed that the produced nonpolar lithium ion secondary battery of the...

Embodiment 3）

[0196]The inventors of the present application found that the active material material that can be used as an active material of a nonpolar battery is not limited to use in an all-solid-state secondary battery, but can also be used in a wet secondary battery, and it can be seen that it shows excellent battery characteristics. The manufacturing method, evaluation method and evaluation results of the wet battery will be described below.

[0197] The active material, ketjen black and polyvinylidene fluoride were mixed in a weight ratio of 70:25:5. Further, N-methylpyrrolidone was added to the mixture to obtain active substance slurry. Thereafter, the active material slurry was uniformly coated on the stainless steel foil with a doctor blade, and then allowed to dry. Stainless steel sheets coated with active substances are used punch punching. The sheet (hereinafter referred to as "disk electrode") was degassed and dried under vacuum at 120°C for 24 hours, and its weight was ...

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Abstract

In conventional lithium ion secondary batteries widely used as power supplies for portable electronic apparatuses, it is becoming extremely difficult to display the polarities of terminal electrodes as the sizes of the batteries are further reduced. Since different kinds of materials are respectively used as active materials configuring the positive electrode and the negative electrode in the conventional lithium ion secondary batteries, there has been a possibility of generating problems of malfunctioning and heating failure of the electronic apparatuses when the batteries are mounted with wrong electrode polarities. Disclosed is a nonpolar secondary battery which is manufactured by developing the battery that functions as a secondary battery using an active material, even if the same material is used as the active material, with which the positive electrode and the negative electrode are configured. Since the terminal electrodes are not differentiated, there is no need to be careful about the mounting direction, and a mounting step is simplified. Furthermore, steps of manufacturing the battery is simplified, since there is no need to separately manufacture a positive electrode layer and a negative electrode layer.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery in which electrode layers are alternately laminated with solid or liquid electrolyte regions interposed therebetween. Background technique [0002] In recent years, the rapid development of electronic engineering technology has realized the miniaturization, lightness, thinning and multi-function of portable electronic devices. Accordingly, there are strong demands for reduction in size, weight, thickness, and reliability of batteries used as power sources for electronic devices. In order to meet such demands, there has been proposed a multilayer lithium ion secondary battery in which a plurality of positive electrode layers and a plurality of negative electrode layers are alternately laminated with a solid electrolyte layer interposed therebetween. A multilayer lithium-ion secondary battery is assembled by stacking battery cells with a thickness of several tens of μm. Therefore, reducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M4/505H01M10/0525H01M10/0562H01M10/0566
CPCH01M4/505H01M10/0585Y02E60/122H01M10/0525H01M4/0471H01M10/0566H01M10/0562Y02E60/10Y02P70/50
Inventor 佐藤洋笹川浩加藤理惠子高桥哲藤田隆幸
Owner NAMICS CORPORATION
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