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secondary battery

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

Active Publication Date: 2019-06-07
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
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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

An object of the present invention is to provide a secondary battery having a small difference between a discharge voltage and a charge voltage, high energy efficiency, and a long charge and discharge life. In order to achieve the above object, the secondary battery of the present invention is a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, characterized in that at least one (11) of the above positive electrode and the above negative electrode contains a metal ion-containing fluoride At least one of metal oxide, metal sulfide, metal nitride and metal phosphide as the active material (12), the electrolyte solution (13) includes an anion acceptor, the above anion acceptor and the electrode active material (12) The contained anions form salts or complexes, whereby the electrode active material (12) can be dissolved in the electrolyte solution (13).

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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Patent Type & Authority Patents(China)
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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