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Electrode active material, electrode, and electricity-storage device

A technology for electrode active materials and power storage devices, which is applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of cycle characteristics decline, irreversible capacity increase, etc., and achieve the effect of low internal resistance and excellent cycle characteristics

Inactive Publication Date: 2015-12-23
MUSASHI ENERGY SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that if graphite particles are directly used as the negative electrode active material, an increase in irreversible capacity and a decrease in cycle characteristics, which are thought to be caused by a decomposition reaction of the electrolyte on the surface of the highly active particles, tend to occur.

Method used

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  • Electrode active material, electrode, and electricity-storage device
  • Electrode active material, electrode, and electricity-storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 7 mol of quinoline and 0.63 mol of hydrofluoric acid were charged into the autoclave, and 0.26 mol of boron trifluoride was supplied while stirring slowly. Next, polymerization reaction was carried out at 230° C. for 4 hours with stirring. After the reaction, the residual catalyst was filtered, and further, the residual catalyst, unreacted substances, and low-boiling point components were removed while nitrogen was blown in at 340° C. at 3 liters per minute overnight. The yield of the obtained pitch was 80%, and the softening point was 216°C. The asphalt is a high nitrogen-containing asphalt with a nitrogen content of 10%.

[0070] Artificial graphite (50% volume cumulative diameter D50 of 13 μm, d002 interplanar distance of 0.3356 nm by X-ray diffraction, specific surface area of ​​12 m 2 / g, the amount of basic functional groups 0.008mmol / g, hereinafter referred to as "artificial graphite A") 100 parts by mass, commercially available pitch with a softening point of ...

Embodiment 2 and 3

[0072] An electrode active material was produced in the same manner as in Example 1 except that the usage-amounts of pitch C and high nitrogen-containing pitch were changed as shown in Table 1. Table 1 shows the evaluation results of the obtained electrode active material.

Embodiment 4

[0074] In Example 1, an electrode active material was produced in the same manner as in Example 1 except that 5 parts by mass of commercially available acetylene black was further added during kneading with a kneader. Table 1 shows the evaluation results of the obtained electrode active material.

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Abstract

The present invention pertains to an electrode active material, an electrode, and an electricity-storage device. Said electrode active material contains a carbonaceous material and has at least 0.020 millimoles of basic functional groups per gram.

Description

technical field [0001] The present invention relates to an electrode active material, an electrode, and an electrical storage device. More specifically, it relates to an electrode active material that can be suitably used for an electrical storage device such as a lithium ion secondary battery or a lithium ion capacitor, and an electrode containing the electrode active material. An electrode, and an electrical storage device including the electrode as a negative electrode. Background technique [0002] In recent years, the miniaturization and weight reduction of electronic devices have been significantly improved, and along with this, there has been a further increase in the demand for smaller and lighter batteries used as power sources for driving the electronic devices. In order to meet such demands for downsizing and weight reduction, nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries have been developed as power storage devices. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32C01B31/04H01M4/36H01M4/587
CPCH01M4/364H01M10/0525H01G11/24H01G11/34H01G11/44H01G11/42H01M4/587H01G11/32Y02E60/10Y02E60/13H01M4/133H01M2004/027
Inventor 田中亮清水贵弘宇高友广
Owner MUSASHI ENERGY SOLUTIONS CO LTD
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