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Electrochemical cell

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve the problems of reduced ion conductivity, reduced charge and discharge capacity of electrochemical batteries, and degradation of cycle life characteristics, and achieves high reliability.

Active Publication Date: 2014-09-17
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, while the electron conductivity path is broken, the ionic conductivity is significantly reduced, so there is a problem that cycle life characteristics such as a decrease in the charge and discharge capacity of the electrochemical cell occur.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0098] The positive electrode 30 can be prepared by currently known preparation methods.

[0099] For example, as the preparation method of the positive electrode 30, a method of mixing the positive electrode active material with an optional positive electrode conductive aid and / or positive electrode binder to form a positive electrode mixture, and forming the positive electrode mixture into an arbitrary shape such as a film . For example, a slurry may be prepared by mixing an arbitrary solvent with a positive electrode mixture, coated on the positive electrode current collector 31 , dried, and then compression-molded to form a slurry.

[0100] In addition, the positive electrode current collector 31 is not particularly limited, and conventionally known positive electrode current collectors can be used. For example, an aluminum foil made of aluminum alloy or pure aluminum is mentioned. In addition, the aluminum foil is preferably subjected to treatment to increase the specif...

Embodiment 1

[0228] In Example 1, first, as an electrochemical cell, prepare as figure 1 (a)~(c) The laminate type nonaqueous electrolyte secondary battery shown.

[0229] In this example, if figure 1 As shown in (a), the outer package 2 is an aluminum laminated film in which a nylon layer (25 μm), an aluminum foil (40 μm), and a polypropylene layer (30 μm) are laminated in this order.

[0230] In addition, the negative electrode body 4 has a negative electrode 40 and a negative electrode current collector 41 . The negative electrode 40 is composed of a negative electrode active material of the present invention described below, a conductive additive, and a binder, and is formed on both surfaces of a negative electrode current collector 41 made of pure copper foil.

[0231] In addition, the positive electrode body 3 has a positive electrode 30 and a positive electrode current collector 31 . The positive electrode 30 is composed of a positive electrode active material, a conductive add...

Embodiment 6

[0270] In addition, in Example 6 (including Example 1) shown in Table 5, C and Ti were added to SiO as a precursor, and the treatment was performed by performing a stabilization process of granulation / sizing, and in addition A non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1 above, and cycle life characteristics were evaluated by the same method.

[0271] In addition, in Examples 7 to 21 shown in Tables 6 and 7, the preparation conditions of the negative electrode active material were changed according to the conditions of each active material number shown in Table 1, and then C, C, and C were added to the SiO as the precursor. Except that Ti was treated through a granulation / sizing stabilization step, a non-aqueous electrolyte secondary battery was prepared in the same manner as in Example 1 above, and cycle life characteristics were evaluated by the same method.

[0272] [Evaluation results]

[0273] Active material numbering 1-1~5-5...

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Abstract

The invention provides an electrochemical cell, which can avoid the cracks in the negative electrode because of the volume expansion or shrinking during the cell charge / discharge process and has the advantages of high reliability, high capacity, and extremely long circulation service life. The electrochemical cell is composed of a positive electrode (30), a negative electrode (40), electrolyte containing an electrolyte-supportive solvent and a non-aqueous solvent, and a partition plate (5). The active substance in the negative electrode (40) is composed of the following particles which comprises at least a Si element and can be reversibly inserted into or removed off alkaline metal ions or alkaline earth metal ions. The particles also comprises at least one component of a first added element M comprising at least one element of B and P, and a second added element R comprising at least one element of In, Sn, Ti, Al, Ge, C, and Zr, wherein the weight of M and R is in a range of 1 ppm to 20% of the total weight of the Si element.

Description

technical field [0001] The present invention relates to an electrochemical battery, in particular to an electrochemical battery such as a nonaqueous electrolyte secondary battery, an electric double layer capacitor, or an ion capacitor. Background technique [0002] An electrochemical cell such as a non-aqueous electrolyte secondary battery as an electrical storage device is equipped with a pair of polarized electrodes composed of a positive electrode and a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an impregnated Electrolyte containing supporting electrolyte and non-aqueous solvent in positive electrode, negative electrode and separator. Such electrochemical cells are used in various small electronic devices such as mobile phones, PDAs, and portable game machines. In particular, laminated, cylindrical, bottomed rectangular, and coin (button) electrochemical cells are often used. . [0003] In addition, SiO x ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCY02E60/13Y02E60/122H01G11/30H01M4/131H01M4/485H01M4/624H01M4/625H01M2004/021Y02E60/10
Inventor 玉地恒昭渡边俊二
Owner SEIKO INSTR INC
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