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Method for charging/discharging positive electrode active material in a lithium secondary battery, charging/discharging system provided with lithium secondary battery and vehicle, electronic device, battery module, battery pack

一种正极活性物质、锂二次电池的技术，应用在二次电池充电/放电、二次电池、二次电池制造等方向，达到高容量、高充放电可逆性的效果

Inactive Publication Date: 2015-03-25
PANASONIC INTPROP MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, non-patent document 2 records that in the economic mode, the charging voltage is set lower and the charging rate reaches 80%, which will make the battery life 1.5 times

Method used

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  • Method for charging/discharging positive electrode active material in a lithium secondary battery, charging/discharging system provided with lithium secondary battery and vehicle, electronic device, battery module, battery pack
  • Method for charging/discharging positive electrode active material in a lithium secondary battery, charging/discharging system provided with lithium secondary battery and vehicle, electronic device, battery module, battery pack
  • Method for charging/discharging positive electrode active material in a lithium secondary battery, charging/discharging system provided with lithium secondary battery and vehicle, electronic device, battery module, battery pack

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Experimental program
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no. 1 Embodiment approach

[0056] Next, a first embodiment of the present invention will be described. This embodiment is a charging and discharging method for a positive electrode in a lithium secondary battery. The lithium secondary battery includes: a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material capable of absorbing and releasing lithium, and a battery arranged between the positive electrode and the negative electrode. between the separator, and the non-aqueous electrolyte.

[0057] The positive electrode active material in this embodiment is a nickel-based lithium-containing composite oxide capable of storing and releasing lithium. Examples of nickel-based lithium-containing composite oxides include LiNiO 2 As a base, a material in which part of Ni is replaced by another element selected from Mg, Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, and B.

[0058] In addition, in the present embodiment, the end-o...

Embodiment 1

[0102] The inventors of the present invention studied the relationship between the discharge termination potential of the positive electrode active material and the charge-discharge reversibility during charge-discharge, produced a single cell for evaluation, and conducted an evaluation test. Hereinafter, the method and results will be described.

[0103] (1-1) Production of positive electrode active materials A, B, and C

[0104] As the positive electrode active material, three kinds of nickel-based lithium-containing composite oxides with different compositions are produced, that is, the composition is based on LiNi 0.815 co 0.15 Al 0.035 o 2 The positive electrode active material A represented by LiNi 0.76 co 0.14 Al 0.10 o 2 The positive active material B represented by , and the composition is represented by LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Represented positive active material C.

[0105] The preparation method of the positive electrode active material A will be des...

no. 2 Embodiment approach

[0182] Next, a second embodiment of the present invention will be described with reference to the drawings. This embodiment is a charging and discharging method using a wound lithium secondary battery.

[0183] First, the structure of the lithium secondary battery in this embodiment will be described.

[0184] Figure 5 It is a schematic cross-sectional view of an example of the lithium secondary battery in this embodiment.

[0185] The lithium secondary battery includes a battery case 1 , an electrode group 4 housed in the battery case 1 , and insulating rings 8 arranged above and below the electrode group 4 . There is an opening above the battery case 1 , and the opening is sealed by a sealing plate 2 .

[0186] The electrode group 4 has a structure in which the positive electrode 5 and the negative electrode 6 are spirally wound multiple times with the separator 7 interposed therebetween. A positive electrode lead 5 a made of, for example, aluminum is drawn out from the...

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Abstract

In a charge / discharge method for a positive-electrode active material in a lithium secondary battery, the lithium secondary battery includes a positive electrode containing a positive-electrode active material capable of occluding and releasing lithium ions, a negative electrode containing a negative-electrode active material capable of occluding and releasing lithium ions, a separator located between the positive electrode and the negative electrode, and an electrolyte having a lithium ion conductivity; and the positive-electrode active material contains a nickel-type lithium-containing complex oxide. The positive electrode, which has been charged, is discharged until having a first potential VDp1 which is no less than 2.7 V and no more than 3.4 V on a lithium metal basis, and then the discharge is finished. Owing to this, the charge / discharge cycle life can be improved while the capacity of the lithium secondary battery is secured.

Description

technical field [0001] The present invention relates to a method for charging and discharging a lithium secondary battery comprising a nickel-based lithium-containing composite oxide as a positive electrode active material. Background technique [0002] Lithium secondary batteries have high capacity and high energy density, and are easy to achieve miniaturization and weight reduction, so they are widely used as portable batteries such as mobile phones, PDAs (Personal Digital Assistants: PDA), notebook computers, video cameras, and portable game consoles. Power supplies for small electronic devices. Portable small electronic devices need to be multi-functional, and on the other hand, it is necessary to overcome the complexity of battery replacement and improve the design of the device. Therefore, there is an increasing demand for a structure in which a lithium secondary battery is built into a device (lithium battery built-in type). In addition, lithium secondary batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44G01R31/36H01M10/052H01M10/48H02J7/00
CPCH02J7/0086H01M10/0445Y02E60/122H01M4/525H01M10/443Y02T10/7011H01M2010/4292H01M10/052H01M10/448H01M4/386H01M10/48Y02E60/10H02J7/007184Y02P70/50Y02T10/70
Inventor 武泽秀治岩本和也山本泰右宇贺治正弥平冈树
Owner PANASONIC INTPROP MANAGEMENT CO LTD
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