Method for charging and discharging lithium secondary battery, and system for charging and discharging lithium secondary battery

A lithium secondary battery, charging and discharging technology, applied in the field of charging and discharging systems, can solve the problem of inability to achieve high-capacity cycle life, etc., and achieve the effects of preventing the deterioration of the negative electrode and suppressing the reduction of the battery capacity

Inactive Publication Date: 2013-09-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of lithium absorbed and released by the positive electrode active material is reduced, although a certain effect of improving reversibility can be obtained, high capacity and long-term cycle life cannot be improved.

Method used

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  • Method for charging and discharging lithium secondary battery, and system for charging and discharging lithium secondary battery
  • Method for charging and discharging lithium secondary battery, and system for charging and discharging lithium secondary battery
  • Method for charging and discharging lithium secondary battery, and system for charging and discharging lithium secondary battery

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no. 1 Embodiment approach ）

[0115] Hereinafter, a first embodiment of the present invention will be described. This embodiment is a lithium secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material capable of storing and releasing lithium, a separator arranged between the positive electrode and the negative electrode, and an electrolyte having lithium ion conductivity. charging and discharging method.

[0116] The positive electrode active material in this embodiment is a lithium-containing transition metal oxide capable of storing and releasing lithium. For example, a composite metal oxide of at least one transition metal selected from cobalt, manganese, nickel, chromium, iron, and vanadium and lithium may be used.

[0117] As the lithium-containing transition metal oxide, a nickel-based lithium-containing composite oxide that is a composite metal oxide of nickel and lithium is preferably used. ...

Embodiment 1

[0197] Lithium secondary batteries in which a nickel-based lithium-containing composite oxide was used as a positive electrode active material and graphite was used as a negative electrode active material were evaluated. Describe its methods and results.

[0198] (1-1) Production of positive electrode active materials A, B, and C

[0199] As the positive electrode active material, three kinds of nickel-based lithium-containing composite oxides with different compositions were carried out: with LiNi 0.815 co 0.15 Al 0.035 o 2 The positive electrode active material A of the composition represented by LiNi 0.76 co 0.14 Al 0.10 o 2 The positive electrode active material B with the composition represented by LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Production of positive electrode active material C with the indicated composition.

[0200] The method for producing the positive electrode active material A will be described below.

[0201] First, an aqueous solution containing nickel s...

Embodiment 2

[0272] (production of positive electrode)

[0273] In the examples, the same positive electrode as that using the positive electrode active material A or the positive electrode active material C in Example 1 was produced.

[0274] In the positive electrode using the positive electrode active material A, the thickness of the positive electrode, that is, the total thickness of the current collector and the positive electrode active material layer is 72 μm, and the positive electrode capacity per unit area is 3.86 mAh / cm 2 . Furthermore, the capacity of the positive electrode is to use lithium metal as the negative electrode, and the charging current value: 0.1mA / cm 2 , Termination voltage: 4.25V, discharge current value: 0.1mA / cm 2 , Termination voltage: the capacity of the case of constant current charge and discharge under the condition of 3.0V.

[0275] In the positive electrode using the positive electrode active material C, the thickness of the positive electrode, that i...

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Abstract

A method for charging and discharging a lithium secondary battery which comprises a positive electrode having a positive electrode active material that is capable of absorbing and desorbing lithium ions, a negative electrode having a negative electrode active material that is capable of absorbing and desorbing lithium ions, a separator that is arranged between the positive electrode and the negative electrode, and a lithium ion-conducting electrolyte. The positive electrode active material contains a lithium-containing transition metal oxide, and the reversible capacity of the negative electrode is larger than the usable capacity of the positive electrode. In this method, a first charge and discharge, wherein the charged positive electrode is discharged to a first potential VDp1 which is lower than 2.7 V based on lithium metal and at which the discharge is terminated, is performed.

Description

technical field [0001] The invention relates to a charging and discharging method and a charging and discharging system for a lithium secondary battery. Background technique [0002] Lithium secondary batteries have high capacity and high energy density, and are easy to miniaturize and lighten, so they are used as portable batteries such as mobile phones, portable information terminals (Personal Digital Assistants: PDA), notebook personal computers, video cameras, and portable game machines. Power supplies for small electronic devices are widely used. In the future, there will be further demands for multi-function and long-time driving of portable small electronic devices. [0003] In order to achieve a further increase in the capacity of lithium secondary batteries, the development of active material materials is being advanced. As the positive electrode active material, for example, a lithium-containing transition metal oxide is used. As lithium-containing transition me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M4/525H01M10/052
CPCH01M4/386H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/44H01M10/446H01M10/448H01M2010/4292Y02E60/10Y02T10/70
Inventor 武泽秀治
Owner PANASONIC CORP
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