Non-aqueous electrolyte battery and negative electrode used therein

A non-aqueous electrolyte and battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as heat accumulation, uneven battery reaction, and difficulty in ensuring battery safety or reliability.

Inactive Publication Date: 2009-02-11
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Here, from the side of the above-mentioned high capacity, there will be problems such as uneven reaction inside the battery due to the high filling rate and internal accumulation of heat. , high current charging and discharging heat and other issues, the common problem in the development of the above two aspects is that it is currently difficult to ensure the safety or reliability of the battery

Method used

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  • Non-aqueous electrolyte battery and negative electrode used therein
  • Non-aqueous electrolyte battery and negative electrode used therein
  • Non-aqueous electrolyte battery and negative electrode used therein

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0062] 〔Preparation of non-aqueous electrolyte solution〕

[0063] In a mixed solvent in which ethylene carbonate (EC) and diethyl carbonate (DEC) are mixed at a ratio of 3:7 by volume, LiPF 6 Prepared by dissolving at a ratio of 1.0 mol / L.

[0064] 〔Battery assembly〕

[0065] Install the lead terminals on the positive and negative electrodes respectively, insert the spacer made of polyethylene, coil it in a spiral shape and apply pressure to manufacture the flattened electrode body, and place it in the storage space of the aluminum laminate film as the battery outer package The electrode body is arranged inside, and after the non-aqueous electrolyte solution is injected into the space, the aluminum laminated films are welded and sealed to each other to manufacture a battery. The design capacity of this battery is 650mAh, and its design capacity is based on the charge termination voltage of 4.2V.

[0066] [Measurement of degree of etherification of CMC]

[0067] The degree ...

Embodiment 1

[0087] As Example 1, the negative electrode and battery shown in the above-mentioned best mode were used.

[0088] The thus produced negative electrode and battery are hereinafter referred to as negative electrode a1 of the present invention and battery A1 of the present invention, respectively.

Embodiment 2

[0090] In the manufacture of the negative electrode active material layer, except that the ratio of artificial graphite: CMC: SBR is controlled to be artificial graphite: CMC: SBR=98.3:0.7:1.0, the negative electrode is manufactured in the same way as in Example 1 above.

[0091] The negative electrode thus produced is hereinafter referred to as the negative electrode a2 of the present invention.

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Abstract

The invention provides a non-aqueous electrolyte battery and a negative electrode used in this battery in which the electron conductivity between the negative electrode active material and the negative electrode current collector is ensured by preventing the adhesion strength of the negative electrode current collector and the negative electrode active material from decreasing even if a porous layer is formed on the surface of the negative electrode. In a negative electrode for a non-aqueous electrolyte battery, in which a negative electrode active material layer (2) containing a negative electrode active material and a water-based binder for the negative electrode active material layer is formed on the surface of a negative electrode current collector (1), a porous layer (3) containing inorganic particles and a non-water based binder for the porous layer is formed on the surface of the negative electrode active material layer (2). The binder for the negative electrode active material layer contains carboxymethyl cellulose (CMC) whose degree of etherification is 0.5 or greater and 0.75 or less.

Description

technical field [0001] The present invention relates to improvement of non-aqueous electrolyte batteries such as lithium ion batteries and polymer batteries, and negative electrodes used in the batteries, and particularly relates to battery structures capable of improving the adhesive strength of the negative electrodes and exhibiting high reliability. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs are rapidly developing, and batteries that serve as driving power sources are required to have higher capacities. Lithium-ion batteries, which are charged and discharged by moving lithium ions between the positive and negative electrodes along with charging and discharging, have high energy density and high capacity, and are therefore widely used as driving power sources for mobile information terminals such as those described above. [0003] However, the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62H01M10/40H01M4/13
CPCH01M4/13H01M4/621H01M10/0525H01M2004/027H01M10/4235Y02T10/7011Y02E60/122Y02E60/10H01M4/02H01M4/48H01M4/62H01M10/052
Inventor 田中昌彰南博之井町直希小笠原毅
Owner SANYO ELECTRIC CO LTD
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