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Lithium secondary cell and method for manufacturing lithium secondary cell

A lithium secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, lithium storage batteries, etc., can solve the problems of lithium secondary battery capacity, output reduction, etc.

Inactive Publication Date: 2019-01-04
HITACHI HIGH-TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is known that the capacity and output of lithium secondary batteries decrease with repeated charging and discharging.

Method used

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  • Lithium secondary cell and method for manufacturing lithium secondary cell

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Embodiment

[0097] Hereinafter, although an Example is shown and this invention is demonstrated concretely, the technical scope of this invention is not limited to this.

[0098] As an example of the present invention, a lithium secondary battery in which the amount of the boroxine compound added to the electrolytic solution was specified based on the amount of the positive electrode active material was produced, and the amount of the boroxine compound added to the electrolyte was specified based on the amount of the positive electrode active material. The lithium secondary battery with the amount of the phosphoric acid compound was used, and the cycle characteristics of the lithium secondary battery were evaluated.

[0099]

[0100] The negative electrode of the lithium secondary battery is made using natural graphite as the negative electrode active material. The average particle size of the natural graphite used is 20μm, and the specific surface area is 5.0m 2 / g, the interplanar di...

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Abstract

The present invention provides a high capacity lithium secondary cell in which the decrease in capacity associated with the charge and discharge cycle is small, and a method for manufacturing the lithium secondary cell. This lithium secondary cell is characterized in being provided with a positive electrode containing a lithium-transition metal composite oxide for which lithium ions can be reversibly stored and released, a negative electrode, and a non-aqueous electrolyte; the non-aqueous electrolyte containing a boroxine compound represented by the general formula (RO)3(BO)3 (where each R independently represents a C2-6 organic group); and the value of the ratio of the number of moles of the boroxine compound and the number of moles of the transition metal atoms in the lithium-transitionmetal composite oxide being 5.7 * 10<-3> or less. This method for manufacturing a lithium secondary cell is characterized in that the boroxine compound is added to the non-aqueous electrolyte so thatthe ratio value of the mol number of the boroxine compound and the mol number of the transition metal atoms in the lithium-transition metal composite oxide is 5.7 * 10<-3> or less.

Description

technical field [0001] The present invention relates to a lithium secondary battery and a method for manufacturing the lithium secondary battery. Background technique [0002] Lithium secondary batteries are used in mobile communication power supplies such as mobile phones and portable personal computers, power supplies for household electrical equipment, power storage devices, uninterruptible power supply devices, etc. Practical applications in the field are widely underway. It is known that the capacity, output, and the like of lithium secondary batteries decrease with repeated charging and discharging. Therefore, there is a demand for a lithium secondary battery that exhibits little deterioration in battery performance over time and has excellent cycle characteristics. [0003] Conventionally, a technique of adding a boroxine compound having a boroxine ring to an electrolyte (electrolyte solution) has been proposed as a technique for suppressing the time-dependent deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/36H01M4/505H01M10/052
CPCH01M10/0567H01M4/485H01M10/0525H01M10/0569Y02E60/10Y02P70/50H01M4/505H01M10/052H01M4/36H01M10/4235
Inventor 春名博史高桥心
Owner HITACHI HIGH-TECH CORP
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