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Secondary battery

A secondary battery and electrolyte technology, which is applied to secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of short charge and discharge life and poor energy efficiency, and achieve the effect of long charge and discharge life and good energy efficiency

Active Publication Date: 2016-08-10
KYOTO UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, such a battery system has the following problems: the energy efficiency is extremely poor due to a very large difference between the voltage during discharge and the voltage during charge, and the charge and discharge life is also short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0099] In the cell configuration shown in Table 1 below, except for the type and amount of the anion acceptor added to the electrolytic solution, six identical lithium batteries were produced as Examples 1 to 6, respectively. The composition of the electrolytic solution is as described in Table 2 below. In addition, in the following Table 1, "coin-shaped cell size 2032 type" represents the coin-shaped cell (lithium battery) with a diameter of 20 mm and a height of 3.2 mm. "SUS316" represents one of the JIS standards of stainless steel. Other abbreviations described in the following Tables 1 and 2 are as described in the columns of the following Table 1.

[0100] [Table 1]

[0101]

[0102] AB: Acetylene black

[0103] PVDF: polyvinylidene fluoride

[0104] EC: ethylene carbonate

[0105] DMC: Dimethyl Carbonate

[0106] [Table 2]

[0107]

[0108] It should be noted that the anion acceptor used in this example and the fluoride ion F are shown in the following Tabl...

Embodiment 7

[0143] A lithium secondary battery was produced as described below. Assembly was carried out in a glove box replaced with argon in the same manner as in Examples 1 to 6.

[0144] Coin unit: diameter 20mm, thickness 3.2mm

[0145] Positive plate: FeF 270wt% (about 0.055g), acetylene black (carbon) 25wt%, PTFE (polytetrafluoroethylene), trade name "Teflon (registered trademark)" 5wt%, diameter 13mm, thickness about 0.5mm

[0146] Negative electrode: Li metal sheet, diameter 13mm, thickness 0.2mm

[0147] Electrolyte: 1M LiPF 6 EC / DMC (volume ratio 1:1, density about 1.3g / cm 3 ) by adding 0.2M of TPFPB

[0148] Separator: Polypropylene microporous membrane

[0149] FeF in coin cell 2 Molar ratio to TPFPB: about 1:0.14

[0150] [Charge and discharge characteristics (lifetime provision)]

[0151] In the battery of Example 7, charging and discharging were repeated five times under the following conditions.

[0152] Charge and discharge conditions: 1.0V-4.5V

[0153] Charg...

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Abstract

The purpose of the present invention is to provide a secondary battery which has a small difference between the voltage during discharging and the voltage during charging, thereby having good energy efficiency, and which has a long charging / discharging life. In order to achieve the above-described purpose, a secondary battery of the present invention, which comprises a positive electrode, a negative electrode and an electrolyte solution, is characterized in that: at least one electrode (11), namely the positive electrode and / or the negative electrode contains, as an active material (12), at least one substance that is selected from the group consisting of metal ion-containing fluorides, metal oxides, metal sulfides, metal nitrides and metal phosphides; an electrolyte solution (13) contains an anion receptor; and the electrode active material (12) is able to be dissolved in the electrolyte solution (13) by having the anion receptor form a salt or a complex together with anions contained in the electrode active material (12).

Description

technical field [0001] The present invention relates to secondary batteries. Background technique [0002] As a feature of a battery using a metal fluoride as an active material, for example, it is possible to use a conversion reaction. As such a battery, there is known, for example, a lithium ion battery in which the cation in the electrolytic solution is Li + . A lithium ion battery using a conversion reaction can obtain, for example, a capacity two to three times that of a lithium ion battery using a normal insertion reaction (for example, Non-Patent Document 1). [0003] prior art literature [0004] non-patent literature [0005] Non-Patent Document 1: Linsen Li, Fei Meng, and Song Jin, "High-Capacity Lithium-Ion Battery Conversion Cathodes Based on Iron Fluoride Nanowires and Insights into the Conversion Mechanism", Nano Lett., 2012, 12(11), pp 6030 -6037 Contents of the invention [0006] The problem to be solved by the invention [0007] However, such a batt...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052H01M10/0569
CPCH01M10/052H01M10/0567H01M10/0569H01M10/054H01M4/5805H01M4/5815H01M10/0568H01M2300/0025H01M4/582Y02E60/10Y02T10/70H01M10/0525
Inventor 小久见善八平井敏郎山木准一堀野秀幸冈崎健一小山幸典
Owner KYOTO UNIV
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