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Ion scavenger for lithium ion secondary cell, liquid electrolyte, separator, and lithium ion secondary cell

An ion scavenger, secondary battery technology, applied in secondary batteries, lithium storage batteries, battery electrodes, etc., can solve the problems of battery characteristics (capacity reduction, etc., to achieve the effects of excellent safety, short circuit suppression, and excellent cycle characteristics)

Active Publication Date: 2018-01-26
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 the constituent material of the positive electrode and precipitated to the negative electrode, which may lower the characteristics (capacity) of the battery.

Method used

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  • Ion scavenger for lithium ion secondary cell, liquid electrolyte, separator, and lithium ion secondary cell
  • Ion scavenger for lithium ion secondary cell, liquid electrolyte, separator, and lithium ion secondary cell
  • Ion scavenger for lithium ion secondary cell, liquid electrolyte, separator, and lithium ion secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0158] Hereinafter, the present invention will be specifically described based on examples. However, the present invention is not limited to the following examples.

[0159] 1. Evaluation method of ion trapping agent

[0160] (1) Moisture content rate

[0161] After the ion scavenger was vacuum dried at 150°C for 20 hours, the water content was measured by Karl Fischer method.

[0162] (2) pH measurement

[0163] Using the glass electrode type hydrogen ion concentration indicator "D-51" (model name) manufactured by Horiba Manufacturing Co., Ltd., the pH of the liquid after the ion trapping agent was added in the following (3) was measured. The measurement is performed at a measurement temperature of 25°C based on JIS Z 8802 "pH Measurement Method".

[0164] (3) Metal ion trapping ability of ion trapping agent in aqueous solution containing metal ions

[0165] ICP emission spectrometry was used to evaluate the metal ion capturing ability. The specific evaluation method is as follows.

[...

Synthetic example 1

[0173] After 0.272 mol of zirconium oxychloride octahydrate was dissolved in 850 mL of deionized water, 0.788 mol of oxalic acid dihydrate was added and dissolved. Next, while stirring the aqueous solution, 0.57 mol of phosphoric acid was added. And while stirring this mixed liquid, it refluxed at 103 degreeC for 8 hours. After cooling, the obtained precipitate was thoroughly washed with water and dried at 150°C to obtain a powder containing zirconium phosphate. As a result of analyzing the obtained zirconium phosphate, it was confirmed to be α-zirconium phosphate (H type) (hereinafter referred to as "α-zirconium phosphate (Z1)").

[0174] After boiling and dissolving the above-mentioned α-zirconium phosphate (Z1) with hydrofluoric acid-added nitric acid, the following composition formula was obtained by ICP emission spectrometry.

[0175] ZrH 2.03 (PO 4 ) 2.01 ·0.05H 2 O

[0176] In addition, the median particle diameter of α-zirconium phosphate (Z1) was measured using a laser di...

Embodiment 1

[0178] While stirring 1000 mL of a 0.1N-LiOH aqueous solution, 100 g of α-zirconium phosphate (Z1) obtained in Synthesis Example 1 was added thereto, and the mixed solution was stirred for 8 hours. After that, the precipitate was washed with water and vacuum-dried at 150°C for 20 hours to produce ZrLi 0.3 H 1.73 (PO 4 ) 2.01 ·0.06H 2 O lithium ion substituted α-zirconium phosphate. The moisture content is 0.4%. This lithium ion-substituted α-zirconium phosphate is a product obtained by replacing 1 meq / g of the total cation exchange capacity with lithium ions, and is referred to as "1meq-Li substituted α-zirconium phosphate (A1-1)" below.

[0179] Next, the 1meq-Li substituted α-zirconium phosphate (A1-1) was used as an ion scavenger, and the above-mentioned evaluations (3) and (4) were performed. The results are shown in Table 1.

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Abstract

The present invention provides an ion scavenger for a lithium ion secondary cell with which it is possible to extend the service life of a lithium ion secondary cell, substantially without affecting aliquid electrolyte due to being imparted with a neutral liquid, the ion scavenger highly selectively scavenging impure metal ions generated from the structural components of the lithium ion secondarycell and minimizing short-circuiting caused by such impurities, and having a high adsorption capacity per unit mass. This ion scavenger for a lithium ion secondary cell contains at least one phosphate selected from (A) alpha-zirconium phosphate having a specific composition in which ion-exchange groups within a prescribed range are substituted by lithium ions, (B) alpha-titanium phosphate havinga specific composition in which ion-exchange groups within a prescribed range are substituted by lithium ions, and (C) aluminum dihydrogen tripolyphosphate having a specific composition in which ion-exchange groups within a prescribed range are substituted by lithium ions.

Description

Technical field [0001] The present invention relates to an ion scavenger, an electrolyte, and a separator suitable as constituent elements of a lithium ion secondary battery, and a lithium ion secondary battery including them. Background technique [0002] Compared with other secondary batteries such as nickel-metal hydride batteries and lead storage batteries, lithium ion secondary batteries are lighter in weight and have high input and output characteristics. Therefore, they are used as high input and output power supplies for electric vehicles, hybrid electric vehicles, etc. attention. [0003] However, if impurities (for example, magnetic impurities such as iron, nickel, manganese, copper, or their ions) are present in the components constituting the lithium ion secondary battery, lithium metal is deposited on the negative electrode during charge and discharge. In addition, lithium dendrites precipitated on the negative electrode break through the separator and reach the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01G11/20H01G11/52H01M2/16H01M4/62H01M10/052H01M50/434H01M50/443
CPCH01G11/20H01G11/52H01M10/0567C01B25/36C01B25/372H01M10/0525H01M10/4235Y02T10/70Y02E60/10H01M50/434H01M50/443H01M4/62H01M10/0563H01M50/431H01M2200/00H01M4/628
Inventor 大野康晴安藤聪子
Owner TOAGOSEI CO LTD
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