Single-ion polymer electrolyte and preparation method thereof and lithium-ion secondary battery

A secondary battery and polymer technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of low conductivity, achieve the effect of improving conductivity, high charge transmission capacity, and improving electrical performance

Active Publication Date: 2016-07-20
杭州聚力氢能科技有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The present invention aims to provide a single-ion polymer electrolyte, its preparation method and lithium ion secondary battery, to solve the problem of low conductivity of the single-ion polymer electrolyte in the prior art

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  • Single-ion polymer electrolyte and preparation method thereof and lithium-ion secondary battery
  • Single-ion polymer electrolyte and preparation method thereof and lithium-ion secondary battery
  • Single-ion polymer electrolyte and preparation method thereof and lithium-ion secondary battery

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preparation example Construction

[0071] In addition, the present invention also provides a method for preparing a single-ion polymer electrolyte, which includes the following steps: combining a π-conjugated compound containing multiple hydroxyl groups with sp 3 The small-molecule lithium salt of hybridized boron undergoes condensation polymerization to form a single-ion polymer electrolyte.

[0072] Here "contains sp 3 Small molecule lithium salt of hybrid boron", "sp 3 Hybridized boron" is sp 3 Boron atoms formed by hybridization. "Small molecule lithium salt" is a relative concept, usually referring to lithium salts with molecular weight less than 500. The "π-conjugated compound containing a plurality of hydroxyl groups" herein means a π-conjugated compound containing two or more hydroxyl groups. And "π-conjugated compounds" refer to compounds containing delocalized large π-bonds, such as p-xylylenedimethanol and the like.

[0073] In the above method provided by the present invention, as long as the π...

Embodiment 1

[0104] (1) Preparation of single-ion polymer electrolyte by polycondensation of 2,5-dihydroxyterephthalic acid and lithium tetramethoxyboron

[0105] 2,5-Dihydroxyterephthalic acid was reacted with an excess of hexamethyldisilazane in anhydrous 1,2-dichloroethane. The reaction solution obtained by the reaction was distilled off the solvent under reduced pressure to obtain an intermediate (silylated product).

[0106] Dissolve 1.217g (2.5mmol) of the above silylated product, 0.3547g (2.5mmol) lithium tetrasilylmethoxyborate in 20mL of anhydrous tetrahydrofuran, react at 45°C for three days, and filter the reaction solution to obtain a white precipitation. Washed several times with anhydrous tetrahydrofuran, dried under vacuum at 60°C for 48 hours to obtain a single-ion polymer electrolyte, named PLBDB. Boron spectrum nuclear magnetic detection shows that the boron in this polymer is sp3 hybridization, and the peak position is 3.83 (BF 3 ·Et 2 O as a reference). GPC test it...

Embodiment 2

[0116] (1) Preparation of single-ion polymer electrolyte by polycondensation of terephthalmic dimethanol and lithium borohydride

[0117] Dissolve 1.382g (10mmol) of terephthalic acid and 0.1089g (5mmol) of lithium borohydride in 20mL of anhydrous tetrahydrofuran. After reacting at 45°C for three days, the reaction solution was filtered to obtain a white precipitate. After washing several times with anhydrous tetrahydrofuran and drying in vacuum at 60°C for 48 hours, a single-ion polymer electrolyte was obtained, which was named PLBPB. Boron NMR detection shows that the boron in the polymer is sp3 hybridization, and the peak position is 3.09 (BF 3 ·Et 2 O as a reference). GPC test its weight average molecular weight is 11768, number average molecular weight is 11500. Its decomposition temperature is 400°C in thermogravimetric test.

[0118] (2) Using the above-mentioned single-ion polymer electrolyte as a raw material to prepare the electrolyte membrane of the battery

[...

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Abstract

The invention discloses a single-ion polymer electrolyte and a preparation method thereof and a lithium-ion secondary battery. The single-ion polymer electrolyte is a pi-conjugated polymer lithium salt containing sp3 hybrid boron anions on a main chain of a molecular chain. In the single-ion polymer electrolyte, the sp3 hybrid boron anions are immobilized on the main chain of the molecular chain of a polymer; and electromigration is inhibited, so that the sp3 hybrid boron anions can be prevented from moving to a cathode of the lithium-ion secondary battery to cause concentration polarization in the discharging process; and the performance of the battery is improved. More importantly, negative charges on the sp3 hybrid boron anions are delocalized, so that the acting force between the sp3 hybrid boron anions and lithium ions with positive charges is relatively weak; and the lithium ions are relatively easily solvated to be ionized. Improvement of the conductivity of the single-ion polymer electrolyte is facilitated; the charge transport capacity in the battery is relatively high when the single-ion polymer electrolyte is applied to the lithium-ion secondary battery; and the electrical properties of the lithium-ion secondary battery are finally improved.

Description

technical field [0001] The invention relates to the field of manufacturing lithium-ion secondary batteries, in particular to a single-ion polymer electrolyte, a preparation method thereof and a lithium-ion secondary battery. Background technique [0002] A liquid organic electrolyte solution is used in conventional lithium-ion secondary batteries. Lithium salts, such as lithium hexafluorophosphate (LiPF 6 , lithiumhexafluorophosphate), lithium perchlorate (LiClO 4 , lithiumperchlorate), lithium bis(trifluoromethylsulfonyl)imide (LiTFSI, lithiumbis(trifluoroemthylsulfonyl)imide), lithium bis(fluorosulfonyl)imide (LiFSI, lithiumdi(fluorosulfonyl)imide) or lithium dioxalate borate ( LiBOB, lithiumbis (oxalate) borate) dissolved in an organic solvent, the organic solvent is propylene carbonate (PC, propylenecarbonate), ethylene carbonate (EC, ethylenecarbonate), diethyl carbonate (DEC, diethylcarbonate), EMC (methyl ethylene carbonate) Ester, ethylmethylcarbonate), dimethyl c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525
CPCY02E60/10
Inventor 程寒松曾丹黎孙玉宝赖远初李改李万清
Owner 杭州聚力氢能科技有限公司
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