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Charging method for nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, etc., can solve the problems of large charging capacity, low usable capacity, uneconomical batteries, etc.

Inactive Publication Date: 2006-04-05
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a battery whose initial charging and discharging efficiency is low is unfavorably equivalent to an uneconomical battery whose charging capacity is large and the usable capacity is low

Method used

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  • Charging method for nonaqueous electrolyte secondary battery
  • Charging method for nonaqueous electrolyte secondary battery
  • Charging method for nonaqueous electrolyte secondary battery

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Embodiment Construction

[0024] Now, the charging method provided by the present invention will be described in detail with reference to the accompanying drawings.

[0025] The charging method according to the present invention is based on a basic concept of performing an initial charging process through a charging step having two or more stages. Specifically, a first charging step is performed in which a stable and thin coating layer is formed on the surface of the anode, and then a second charging step is performed in which a charging process is performed to bring the anode potential Below the potential in the first charging step, for example, a charging process is carried out until the battery is fully charged.

[0026] Here, the first charging step is important and the conditions of the first charging step are determined to form a good covering layer.

[0027] In the present invention, one or more non-aqueous solvents with a reduction potential higher than that of the main solvent are added to th...

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Abstract

An initial charging operation is carried out by a charging step composed of two-stages or more to improve an initial charging and discharging efficiency, reduce the charge of wasteful materials and improve a high capacity and a high cyclic characteristic without deteriorating various kinds of battery properties. In order to realize the improvements, a nonaqueous solvent which is decomposed under a potential higher than the reduction and decomposition potential of a main solvent is included in electrolyte. This charging method is a method for achieving the addition effect of such a nonaqueous solvent as much as possible. As a specific means, the electrolyte to which vinylene carbonate is added is employed and a constant-current and constant-voltage charge under about 3.2 V is carried out for 1 to 2 hours before a battery is completely charged. Thus, a good coat can be formed on the surface of an anode while suppressing the quantity of electricity required for forming the coat.

Description

technical field [0001] The present invention relates to a charging method for charging a nonaqueous electrolyte secondary battery (for example, a so-called lithium ion secondary battery), and more particularly to a novel charging method by which high performance of the nonaqueous electrolyte secondary battery can be fully obtained. Background technique [0002] Recently, batteries have taken an important place as power sources for portable electronic devices. In order to realize a miniaturized and light-weight device, it is necessary to reduce the weight of the battery, and thus, such a battery needs to make full use of the space used in the device. [0003] Lithium batteries with their high energy density and output density are better suited to meet these needs. [0004] Lithium secondary batteries having the above-mentioned high performance are further required to have higher performance to meet the needs of developing devices with high performance. [0005] At that time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/38H01M10/40H01M4/13H01M4/58H01M4/587H01M6/16H01M10/05H01M10/0525H01M10/0565H01M10/0567H01M10/0569H01M10/058
CPCH01M10/0525H01M10/0569Y02E60/122H01M10/446H01M10/44H01M2300/0037Y02E60/12H01M6/168Y02E60/10Y02P70/50
Inventor 渋谷真志生原富太郎铃木佑辅北昭宪
Owner MURATA MFG CO LTD
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