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Ion trapping agent, lithium ion battery separator, and lithium ion secondary battery

A technology of ion scavenger and secondary battery, which is applied in the field of ion scavenger, can solve the problems of battery characteristics (capacity reduction, etc.), and achieve the effect of suppressing the reduction of battery capacity and suppressing the deterioration over time

Active Publication Date: 2020-07-17
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, metals such as manganese are eluted from the lithium-containing metal oxide that is a constituent material of the positive electrode and precipitated on the negative electrode, which may reduce the characteristics (capacity, etc.) of the battery.

Method used

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  • Ion trapping agent, lithium ion battery separator, and lithium ion secondary battery
  • Ion trapping agent, lithium ion battery separator, and lithium ion secondary battery
  • Ion trapping agent, lithium ion battery separator, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0139] Hereinafter, the disclosure of this specification will be specifically described based on examples. However, this embodiment is not limited to the following examples at all. In addition, in the following examples, % is mass %.

[0140]

[0141] (1) Moisture content

[0142] After vacuum-drying the ion trapping agent at 150°C for 20 hours, according to JIS K0113 "General Rules for Potential Difference, Current, Electricity, and Karl Fischer Titration Methods", use a Karl Fischer moisture meter MKC-710 manufactured by Kyoto Denshi Kogyo Co., Ltd., gas Chemical device ADP-611, using the Karl Fischer method to determine the moisture content.

[0143] (2) Metal ion capture capacity in the electrolyte

[0144] Assuming application to a lithium-ion secondary battery, evaluate the metal ion capture capacity in a model electrolyte solution. The specific evaluation method is as follows.

[0145] [Measurement of cobalt ion capture capacity]

[0146] For the test solution, ...

manufacture example 1

[0164] Synthesis of α-Zirconium Phosphate

[0165] After dissolving 0.272 mol of zirconium oxychloride octahydrate (manufactured by Wako Pure Chemical Industries, Ltd.) in 850 ml of deionized water, 0.788 mol of oxalic acid dihydrate (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved. While stirring the solution, 0.57 mol of phosphoric acid was added. It was stirred for 8 hours and refluxed. After cooling, the obtained precipitate was fully washed with water, and then dried at 150°C to obtain zirconium phosphate. As a result of analyzing this zirconium phosphate, it was confirmed that it contained 6.64 mmol of H per 1 g + The ions, that is, the theoretical exchange capacity of the ion exchange group is 6.64meq / g alpha zirconium (1) Zr (HPO 4 ) 2 ·H 2 O.

[0166] In addition, when the median diameter of zirconium phosphate α was measured (laser diffraction particle size distribution meter "LA-950" (model name) manufactured by Horiba, Ltd.), it was 0.9 μm...

manufacture example 2

[0168] Synthesis of Calcined Li Substituted Alpha Zirconium Phosphate (1)

[0169] 70 g of the alpha zirconium phosphate (1) obtained in Production Example 1 was added to 7000 ml of a 0.1N (mol / L) LiOH aqueous solution while stirring. After stirring this further for 8 hours, the filter was filtered and washed with water until the electric conductivity of the filtrate became 500 μS / cm or less. After washing with water, vacuum-drying at 150° C. for 20 hours, and further firing at 400° C. for 4 hours gave fired Li-substituted zirconium phosphate (1). The median particle size is 0.9 μm. The calcined Li-substituted α-zirconium phosphate (1) is ZrO with an introduction amount of Li ions of 6.78meq / g. 2 ·P 2 o 5 · Li 2 O. In addition, the lithium atoms in this composition and the phosphate group PO 4 The mass ratio (Li / PO 4 ) is 0.073. (Example 1)

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Abstract

Provided are: an ion trapping agent which is a layered phosphoric acid compound that does not have water of crystallization and that supports lithium ions in an amount that is beyond the theoretical exchange capacity of a layered phosphoric acid compound including protons as an ion-exchange group; and a lithium ion secondary battery or a lithium ion battery separator containing said ion trapping agent.

Description

technical field [0001] The present invention relates to an ion scavenger, a separator for a lithium ion battery, and a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries are lighter in weight and have higher input-output characteristics than other secondary batteries such as nickel-metal hydride batteries and lead-acid batteries. focus on. [0003] However, when there are impurities (such as magnetic impurities such as Fe, Ni, Mg, Cu, or their ions) in the constituent materials of the battery, lithium constituting the positive electrode may be deposited on the negative electrode during charging and discharging. For example, lithium dendrites (dendrite) deposited on the negative electrode break through the separator and reach the positive electrode, which may cause a short circuit. [0004] In addition, lithium-ion secondary batteries may be used at a temperature of 40° C. to 80° C. in a car in summer. In this case, metals such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28C01B25/45H01M2/16H01M4/62H01M10/0525H01M10/0566H01M10/0567H01M50/409H01M50/443
CPCH01M10/0525B01J20/02B01J20/28C01B25/45H01M50/409H01M4/5825H01M50/443Y02E60/10H01M4/62H01M10/0567H01M50/431H01M50/449H01M50/489H01M50/417
Inventor 大野康晴
Owner TOAGOSEI CO LTD
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