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Positive electrode active material for nonaqueous secondary battery

A positive active material, non-aqueous secondary battery technology, applied in secondary batteries, battery electrodes, battery pack components, etc., can solve problems such as low cycle characteristics, and achieve excellent performance, low environmental load, and sufficient charge-discharge capacity. Effect

Inactive Publication Date: 2012-07-18
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, another problem is that 1,4-benzoquinone compounds are easily dissolved in the electrolyte solution during charge and discharge, causing low cycle characteristics

Method used

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  • Positive electrode active material for nonaqueous secondary battery
  • Positive electrode active material for nonaqueous secondary battery
  • Positive electrode active material for nonaqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use 2,5-dimethoxy-1,4-benzoquinone (Tokyo Chemical Industry Co., Ltd.) as the positive electrode active material, use acetylene black as the conductive additive, and use PTFE as the binder, with a ratio of 4:5:1 A 90 μm thick sheet was prepared by mixing the active material, conductive additive and binder in a weight ratio of . The sheet was bonded to an aluminum mesh (thickness: 110 μm) while being compressed, thereby manufacturing a positive electrode. Using this as a positive electrode material, lithium foil as a negative electrode material, lithium perchlorate / γ-butyrolactone (1.0 mol / L) as an electrolyte, and a glass filter as a separator, a test coin-type battery was fabricated.

[0041] The battery was subjected to a charge-discharge test in a 30° C. atmosphere at a current density of 10 mA / g or 20 mA / g in a potential range of 1.5 to 3.4 V (vs. Li). figure 1 The initial discharge curve (current density: 10 mA / g) is shown. from figure 1 As is evident in , the d...

Embodiment 2

[0045] 2,5-Difluoro-3,6-dimethoxy-1,4-benzoquinone was synthesized according to the method described in P.P. Sah, S.A. Peoples, Arzneimittelforschung, 1961, 11, pp. 27-33. Using this as a positive electrode active material, using acetylene black as a conductive additive and PTFE as a binder, the active material, the conductive additive, and the binder were mixed in a weight ratio of 4:5:1 to prepare a sheet. The sheet was bonded to an aluminum mesh while being compressed, thereby manufacturing a positive electrode. Using it as the positive electrode material, using lithium foil as the negative electrode material, using lithium bis(pentafluoroethanesulfonyl)imide / γ-butyrolactone (3.0mol / L) as the electrolyte solution, and using glass filter membrane as the separator, manufacturing A coin-type battery was used for the test.

[0046] The battery was subjected to a charge-discharge test at a current density of 20 mA / g in a potential range of 1.5 to 3.8 V (vs. Li). image 3 The i...

Embodiment 3

[0048] According to Keegstra, E.M.D.; van der Mieden, V.; Zwikker, J.W.; Jenneskens, L.W.; Schouten, A.; Kooijman, H.; Veldman, N.; 2,5-dipropoxy-1,4-benzoquinone was synthesized by the method described on page 1105. Using this as a positive electrode active material and ion-conductive glass as a separator, a double-chamber test sealed battery was manufactured. Figure 4 A battery is shown schematically.

[0049] exist Figure 4 In the experimental battery shown in , the current collector for the positive electrode was an aluminum plate, the current collector for the negative electrode was a stainless steel plate, and the negative electrode material was lithium foil. The electrolytic solution on the negative electrode side is lithium perchlorate / γ-butyrolactone (1.0 mol / L). The electrolyte was kept in a glass filter and placed between the negative electrode (lithium foil) and ion-conducting glass. On the other hand, the electrolytic solution on the positive electrode side ...

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Abstract

Disclosed are: a positive electrode active material for a nonaqueous solvent secondary battery, which contains, as an active ingredient, a 1,4-benzoquinone compound that has a lower alkoxy group as a substituent; and a nonaqueous secondary battery which comprises the active material as a constituent. Consequently, a positive electrode active material for a nonaqueous secondary battery, which has high energy density and excellent cycle characteristics, can be obtained using a positive electrode active material that is composed of an organic compound that places a little burden on the environment.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous secondary battery such as a lithium ion secondary battery, and also to a nonaqueous secondary battery using the active material. Background technique [0002] Lithium ion secondary batteries are used as power sources for various devices. In particular, batteries with higher energy density are required for use in power sources of hybrid vehicles and the like. A positive electrode active material generally used for a lithium ion secondary battery mainly uses a compound containing a heavy metal such as lithium cobalt oxide. However, an active material including a material with a low environmental load is desirable in terms of impact on the environment. [0003] Some heavy metal-free organic compounds have been proposed as positive electrode active materials for lithium ion secondary batteries. In particular, 1,4-benzoquinone compounds are known to undergo a two-elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M2/16H01M10/0562
CPCY02E60/122H01M4/625H01M4/623H01M4/60H01M10/0525Y02T10/7011H01M4/606Y02E60/10Y02T10/70
Inventor 八尾胜妹尾博安田和明
Owner NAT INST OF ADVANCED IND SCI & TECH
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