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Negative electrode for secondary battery, and secondary battery using same

A secondary battery and negative electrode technology, applied in the direction of secondary batteries, battery electrodes, batteries, etc., can solve the problems of shortened cycle life, battery damage, poor adhesion, etc., and achieve the effect of excellent performance balance

Inactive Publication Date: 2012-08-15
NIPPON STEEL CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this PVDF, there is a problem that the cycle life may be shortened due to poor adhesion to the active materials and the current collector.
In addition, when the battery temperature rises abnormally due to a short circuit, etc., PVDF decomposes to generate HF (hydrogen fluoride), and this HF reacts violently with Li (exothermic reaction), so the battery may be damaged or ruptured, and there is also a problem in terms of reliability.
[0018] In order to solve such a problem, in Patent Document 8, a polyimide resin is used as a binder, but in this Patent Document 8, it is not mentioned whether there is a lithium secondary battery suitable for inputting and outputting a large current. Input and output characteristics

Method used

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  • Negative electrode for secondary battery, and secondary battery using same
  • Negative electrode for secondary battery, and secondary battery using same
  • Negative electrode for secondary battery, and secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Lump coke (green coke) produced by using refined pitch obtained by removing quinoline-insoluble components from coal-based heavy oil and heat-treating at 500°C for 24 hours by the delayed coking method is carried out with a jet mill. Finely pulverized and sized to obtain green coke powder with an average particle diameter of 9.9 μm.

[0085] The lump-shaped green coke obtained as above is heat-treated at a temperature from 700° C. near the inlet to 1500° C. (the highest reaching temperature) near the outlet through a rotary kiln for more than 1 hour to obtain lump-shaped calcined coke. Finely pulverize and sizing, to obtain calcined coke powder with an average particle size of 9.5 μm.

[0086] To the total of 50 parts by mass of green coke powder and 50 parts by mass of calcined coke powder (100 parts by mass of coke powder) obtained as above, phosphoric acid ester (14 mass % active phosphorus solid resin: Sanko Corporation trade name HCA, chemical name : 9,10-dihydro-...

Embodiment 2～5

[0099] A negative electrode was obtained in the same manner as in Example 1 except that polyimide resins 2 to 5 having the compositions shown in Table 1 were used instead of the binder used in Example 1. About the obtained negative electrode, discharge capacity, output characteristic, and cycle characteristic were evaluated similarly to Example 1. The results are shown in Table 1. In addition, the meaning of the abbreviation written in Table 1 is as follows. For the polyimide resins 2 to 5, the precursors were respectively polymerized in the same manner as in Example 1, and imidized by heat treatment at the time of forming the active material layer.

[0100] BTDA: 3,3’,4,4’-Benzophenone tetracarboxylic dianhydride

[0101] BPDA: 3,3’,4,4’-Biphenyltetracarboxylic dianhydride

[0102] TPE-R: 1,3-bis(4-aminophenoxy)benzene

[0103] APB: 1,3-bis(3-aminophenoxy)benzene

[0104]

Embodiment 6

[0106] Lump coke (green coke) produced by using refined pitch obtained by removing quinoline-insoluble components from coal-based heavy oil and heat-treating at 500°C for 24 hours by the delayed coking method is micronized with a jet mill. Grinding and sizing were performed to obtain green coke powder with an average particle diameter of 9.9 μm.

[0107] The lump-shaped raw coke obtained as above was heat-treated at a temperature from 700° C. near the inlet to 1500° C. (the highest reaching temperature) near the outlet through a rotary kiln for more than 1 hour to obtain lump-shaped calcined coke. Finely pulverize and sizing, to obtain calcined coke powder with an average particle size of 9.5 μm.

[0108] To the total of 50 parts by mass of green coke powder and 50 parts by mass of calcined coke powder (100 parts by mass of coke powder) obtained as above, phosphoric acid ester (14 mass % active phosphorus solid resin: Sanko Corporation trade name HCA, chemical name : 9,10-dih...

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Abstract

Disclosed is a negative electrode for a secondary battery, which is capable of sufficiently improving input / output characteristics of a secondary battery such as cycle life, while having practical characteristics such as discharge capacity, initial efficiency, capacity retention rate and reliability (safety) that are required for use on vehicles such as an HEV. Specifically disclosed is a negative electrode for a secondary battery, which comprises an active material layer in which a negative electrode active material is integrated by a binder. The negative electrode material is obtained by firing a coke material which is obtained by blending one or more kinds of green coal or petroleum coke and one or more kinds of calcined coal or petroleum coke at a mass ratio of from 90:10 to 10:90, and to which a phosphorus compound or a phosphorus compound and a boron compound are added, while essentially containing the phosphorus compound, per 100 parts by mass of the green coke and calcined coke in total. The binder is composed of a polyimide resin.

Description

technical field [0001] The present invention relates to a negative electrode for a secondary battery and a secondary battery using the same. Background technique [0002] Lithium secondary batteries, one of the secondary batteries, have higher energy density than other secondary batteries, so they can be miniaturized and lightweight. Digital Assistant) and mobile electronic devices such as camcorders are widely used as power sources. This demand is expected to increase in the future. [0003] In addition, in order to cope with energy issues and environmental issues, in addition to electric vehicles and hybrid electric vehicles (HEV: Hybrid Electric Vehicle) that combine electric motors driven by nickel-metal hydride batteries and gasoline engines, the demand for batteries for power storage continues to increase. Further improvement of lithium secondary battery performance (especially cycle characteristics and output characteristics). [0004] In a lithium secondary batter...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/587H01M4/62
CPCH01M4/133H01M4/364H01M4/587H01M4/621H01M4/622H01M10/0525H01M10/4235Y02E60/10H01M2220/20Y02T10/70
Inventor 田中利昌小关和德及川真二池田大佐
Owner NIPPON STEEL CHEMICAL CO LTD
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