Lithium ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, battery electrodes, battery pack components, etc., can solve problems such as insufficient and reduced output power

Inactive Publication Date: 2012-12-19
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, in the conventional utilization technology of vinylene carbonate shown in Non-Patent Document 1, when the amount of addition is increased, the following problems arise: although the deterioration during high-charge high-temperature storage can be suppressed, it is not sufficient, and at room temperature output power reduction

Method used

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Examples

Experimental program
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Embodiment 1

[0104] (Production of coated negative electrode active material)

[0105] Disperse 10 parts by weight of amorphous carbon, that is, pseudo anisotropic carbon as a negative electrode active material, in 90 parts by weight of an acetonitrile solution containing 1 wt% of polyethylene carbonate (PEC) (number average molecular weight: 50,000). The resulting dispersion was left in an organic draft for 6 hours. Then, the negative electrode active material was precipitated in the dispersion, and 70 parts by weight of the supernatant was removed. Then, the remaining precipitate was dried in an atmosphere of 80° C. for 12 hours to obtain a negative electrode active material with almost no aggregation. The existence of the PEC coated on the negative electrode active material can be confirmed by observing the characteristic stretching vibration of the functional group contained in the PEC by measuring the diffuse reflectance infrared absorption spectrum. In this example, especially the ...

Embodiment 2

[0123] (Production of coated negative electrode active material)

[0124] Disperse 10 parts by weight of amorphous carbon, that is, pseudo anisotropic carbon as a negative electrode active material, in 90 parts by weight of an acetonitrile solution containing 1 wt% of polyethylene carbonate (PEC) (number average molecular weight: 50,000). The resulting dispersion was placed in an organic ventilator for 6 hours. Then, the negative electrode active material was precipitated in the dispersion, and 70 parts by weight of the supernatant was removed. Then, the remaining precipitate was dried in an atmosphere of 80° C. for 12 hours to obtain a PEC-coated negative electrode active material with almost no aggregation. Furthermore, the PEC-coated negative electrode active material was dispersed in dicarbonate containing 5 wt% of vinylene carbonate (VC) and 0.1 wt% of 2,2'-azobisisobutyronitrile (AIBN) as a radical polymerization initiator. in methyl ester solution. The resulting disp...

Embodiment 3

[0126] (Production of coated negative electrode active material)

[0127] With respect to 100 parts by weight of amorphous carbon, that is, pseudo anisotropic carbon as the negative electrode active material, an amount equivalent to 1 part by weight of vinyltriethoxysilane was previously dispersed in pure water so as to have a concentration of 10% by weight. The resulting solution was fully mixed, and then vacuum-dried at 150° C. for 2 hours to obtain a silane-treated negative electrode active material. Next, 10 parts by weight of the silane-treated negative electrode active material was dispersed in 90 parts by weight of an acetonitrile solution having a polyethylene carbonate (PEC) content of 1 wt%. The resulting dispersion was placed in an organic ventilator for 6 hours. Then, the negative electrode active material was precipitated in the dispersion, and 70 parts by weight of the supernatant was removed. Then, the remaining precipitate was dried in an atmosphere of 80° C....

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Abstract

A lithium ion battery includes: a positive electrode capable of occluding and emitting lithium ions; a negative electrode that is capable of occluding and emitting lithium ions; a separator disposed between the positive electrode and the negative electrode; and an electrolytic solution. The negative electrode of the lithium ion battery is coated with a lithium ion conductive polymer. The lithium ion battery maintains high-temperature storage characteristics at temperatures of 50 DEG C. or more and output characteristics at room temperature of the lithium ion battery are improved.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. Background technique [0002] From the standpoint of environmental protection and energy saving, a hybrid vehicle using both an engine and a motor as a power source is being developed and commercialized. In addition, for the future, the development of a fuel cell hybrid vehicle using a fuel cell instead of an engine is also being actively carried out. [0003] As an energy source for this hybrid vehicle, a secondary battery that can be repeatedly charged and discharged is an essential technology. Among them, a lithium ion secondary battery is a battery characterized by a high operating voltage and a high energy density that can easily obtain a high output, and will become increasingly important as a power source of a hybrid vehicle in the future. [0004] One of the problems of a lithium ion secondary battery as a power source for a hybrid vehicle is to suppress an increase in resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M4/505Y02E60/122H01M4/366H01M4/622H01M10/0525Y02T10/7011H01M4/13Y02E60/10Y02T10/70
Inventor 奥村壮文森岛慎福地久仁夫山内惠理奈
Owner HITACHI LTD
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