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Lithium ion secondary battery and method for manufacturing same

A secondary battery, lithium ion technology, used in secondary batteries, lithium storage batteries, batteries, etc., can solve the problem of low conductivity, and achieve the effect of excellent storage characteristics and cycle characteristics

Inactive Publication Date: 2019-04-26
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these materials have low electrical conductivity, so a structure in which the surface of the particles is coated with a conductor such as carbon has been proposed (Patent Documents 1 and 2)

Method used

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  • Lithium ion secondary battery and method for manufacturing same
  • Lithium ion secondary battery and method for manufacturing same
  • Lithium ion secondary battery and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164]

[0165] Li as a Li-containing compound 2 CO 3 , CO as a Co-containing compound 3 o 4 , Mg(OH) as a magnesium-containing compound 2 , ZrO as a zirconium-containing compound 2 , and Al(OH) as an Al-containing compound 3 After adding into a mortar and mixing at an appropriate mixing ratio, solidified into a granular form, fired at 950°C for 24 hours in an atmospheric atmosphere (atmospheric pressure) using a muffle furnace, and synthesized an ICP (inductively coupled plasma , Inductive Coupled Plasma) method obtained composition formula is LiCo 0.9795 Mg 0.011 Zr 0.0005 Al 0.009 o 2 lithium cobaltate (A1).

[0166] Next, the pH value was set to 10, and 10 g of the aforementioned lithium cobaltate (A1) was added to 200 g of a lithium hydroxide aqueous solution at a temperature of 70° C., stirred to disperse, and then Al(NO 3 ) 3 9H 2 O: 0.0154g and ammonia water used to suppress pH fluctuations to generate Al(OH) 3 Co-precipitates are attached to the surfac...

Embodiment 2

[0188] The composite Si-2 (average particle size 5 μm, specific surface area 7.9m 2 / g, the amount of carbon material in the complex is 8 mass %) use as negative electrode active material, the volume ratio of the mixed solvent used in the non-aqueous electrolytic solution is made as propylene carbonate: diethyl carbonate=30:70, except Other than that, it carried out similarly to Example 1, and produced the lithium ion secondary battery.

Embodiment 3

[0190] Graphite A (graphite obtained by coating the surface of mother particles made of natural graphite with amorphous carbon using pitch as a carbon source, with an average particle size of 10 μm): 30% by mass and the aforementioned Si-1: 70% by mass, and The V-type mixer was mixed for 12 hours to obtain the negative electrode active material. Hereinafter, a lithium ion secondary battery was produced in the same manner as in Example 1, except that the aforementioned negative electrode active material was used and the lithium foil 33 having a mass of 14 mg per sheet was used.

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Abstract

The present invention provides a lithium ion secondary battery having excellent storability and charge / discharge cycle characteristics; and a method for manufacturing the same. The present invention pertains to a lithium ion secondary battery having: an electrode assembly in which a positive electrode and a negative electrode are stacked or wound with a separator therebetween; and a non-aqueous electrolyte solution, the lithium ion secondary battery being characterized in that: negative electrode active materials in the negative electrode include Si-containing material S; the content of material S is at least 5 mass% when the total amount of the negative electrode active materials contained in the negative electrode is 100 mass%; the non-aqueous electrolyte solution includes a solvent containing propylene carbonate and chain carbonate; the volume content of the propylene carbonate in the solvent is 10-50 vol%; the positive electrode has, on at least one surface of a positive electrodecurrent collector, a positive electrode cladding layer containing, as a positive electrode active material, a metal oxide consisting of Li and metal M, which is a metal other than Li; and the upper limit of charging voltage is at least 4.35 V.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery with high capacity and excellent charge-discharge cycle characteristics and a method for manufacturing the same. Background technique [0002] Lithium-ion secondary batteries, one of electrochemical elements, are considered to be used in power storage systems for portable devices, automobiles, electric tools, electric wheelchairs, household use, and business use due to their high energy density. Especially for portable devices, they are widely used as power sources for mobile phones, smartphones, tablet PCs, and the like. [0003] However, lithium ion secondary batteries have been required to increase their capacity and improve various battery characteristics along with the expansion of their applicable devices. In particular, since it is a secondary battery, it is strongly required to improve the charge-discharge cycle characteristics. [0004] In general, carbon materials such as grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M2/16H01M4/36H01M4/38H01M4/48H01M4/525H01M10/0569H01M10/0587H01M10/0585H01M50/414H01M50/417H01M50/451H01M50/491
CPCH01M4/525H01M10/0569H01M4/366H01M4/505H01M4/483H01M10/0525Y02E60/10Y02P70/50H01M50/446H01M50/417H01M50/451H01M50/491H01M50/414H01M4/0459H01M4/131H01M4/1391H01M4/62H01M10/052H01M10/0585H01M10/0587H01M10/446H01M2300/0037H01M4/134H01M10/448H01M50/449H01M2220/30
Inventor 阿部浩史吉川进关谷智仁
Owner MAXELL HLDG LTD