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Electrochemical cell

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve the problems of negative electrode mechanical damage, charge and discharge efficiency reduction, etc., and achieve the effects of preventing foreign matter concentration, high reliability, excellent charge and discharge efficiency and cycle life characteristics

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

For example, in the negative electrode material, when easily soluble foreign matter is mixed in the electrode, it may react with the negative electrode material, resulting in a decrease in charge and discharge efficiency. There is a risk of mechanical damage to the negative electrode

Method used

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  • Electrochemical cell
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Examples

Experimental program
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Effect test

preparation example Construction

[0094] The positive electrode 30 can be prepared by currently known preparation methods.

[0095] For example, as the preparation method of the positive electrode 30, it can be enumerated that the positive electrode active material is mixed with the positive electrode conductive aid and / or the positive electrode binder as needed to form a positive electrode mixture, and the positive electrode mixture is press-molded into an arbitrary shape such as a film. Methods. For example, the positive electrode 30 can be formed by mixing an arbitrary solvent with a positive electrode mixture to prepare a slurry, coating it on a current collector, and performing compression molding after drying.

[0096] The positive electrode current collector 31 is not particularly limited, and conventionally known positive electrode current collectors can be used. For example, as the positive electrode current collector 31 , an aluminum foil made of aluminum alloy or pure aluminum may be mentioned.

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Embodiment 1

[0150] In Example 1, first, as an electrochemical cell, prepare as figure 1 (a)~(c) The laminate type nonaqueous electrolyte secondary battery shown. It should be noted that, in this embodiment, SiO is used as the negative electrode active material to prepare a non-aqueous electrolyte secondary battery.

[0151] First, SiO powder as the negative electrode active material, graphite as the conductive agent, and polyvinylidene fluoride as the binder were mixed (45:40:15 by mass ratio), and then dispersed in N-methyl -Preparation of negative electrode mixture slurry in 2-pyrrolidone.

[0152] Next, the negative electrode mixture slurry is evenly coated on both sides of a copper foil with a thickness of 20 μm, and after drying, it is compressed and molded with a roll press to prepare a negative electrode sheet (a negative electrode sheet in which a negative electrode is laminated on a negative electrode current collector. body). The thickness of the negative electrode sheet wa...

Embodiment 2~5

[0163] [Reference example 1~9]

[0164] In Examples 2 to 5 and Reference Examples 1 to 9, for the preparation conditions of the battery in Example 1, the coating thickness of the negative electrode mixture slurry was changed, SiO as the negative electrode active material, graphite as the conductive agent, Changes in the storage state (storage container, storage place, storage period) of polyvinylidene fluoride as a binder or their mixture, or changes in the environment where the mixing is performed, prepare negative electrodes.

[0165] Next, the same measurement as above was performed using transmission X-ray analysis and fluorescent X-ray analysis, thereby confirming negative electrodes having various numbers of foreign substances.

[0166] Then, using these negative electrodes, batteries were assembled in the same manner as in Example 1 above, and the capacity retention rate was measured by the same method.

[0167] Including Example 1, the thickness, number of foreign mat...

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Abstract

The invention provides an electrochemical cell. The additive in the negative electrode can be easily and reliably differentiated or identified / quantified from impurities, thus the amount of impurities in the negative electrode can be reduced, and large-sized impurities can be prevented from entering the negative electrode, so the electrochemical cell has the advantages of high reliability, high charge / discharge efficiency, and extremely long circulation service life. The electrochemical cell has a positive electrode (30), a negative electrode (40), electrolyte containing electrolyte-supportive solvents and non-aqueous solvents, and a partition plate (5). The active material in the negative electrode (40) is composed of at least one component of SiOx (0<x<2), Si, and C, the thickness of the negative electrode (40) is less than 20 [mu]m, the number of particles with an average size phi of 20 [mu]m or more is less than 40 on each 100 cm2 of electrode area in the negative electrode (40) when the negative electrode (40) is observed on a plane under transmission X rays.

Description

technical field [0001] The present invention relates to an electrochemical battery, in particular to an electrochemical battery such as a non-aqueous electrolyte secondary battery, a chip-type 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, laminate type or coin (button) type electrochemical cells are often used. [0003] In addition, SiO x , Si, and C are widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/583H01M4/131H01M4/133H01M4/134H01M4/62H01G11/30H01G11/32
CPCY02E60/13Y02E60/122H01G11/30H01G11/32H01M4/131H01M4/133H01M4/134H01M4/386H01M4/48H01M4/583H01M4/625H01M2004/021Y02E60/10Y02P70/50
Inventor 菅野佳实渡边俊二
Owner SEIKO INSTR INC
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