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Lithium polyoxometallate composite diaphragm for lithium battery

A technology of lithium polyoxometalate and composite diaphragm, which is applied to battery components, circuits, electrical components, etc., can solve the problems of inability to realize lithium ion combination and the influence of ion-conducting characteristics, and achieve good pore size and ion transmission rate , reduce the internal resistance of the battery, and improve the effect of the rate characteristic

Active Publication Date: 2014-09-17
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separator material mentioned above can only block electrons, and cannot combine with lithium ions in the electrolyte, and its ion-conducting properties will inevitably be affected.

Method used

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  • Lithium polyoxometallate composite diaphragm for lithium battery
  • Lithium polyoxometallate composite diaphragm for lithium battery
  • Lithium polyoxometallate composite diaphragm for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method is:

[0030] 1. Lithium polyoxometalate-SiO 2 Preparation of composite carrier

[0031] SiO 2 Powder in Li 3 PMo 12 O 40 After being immersed in anhydrous methanol solution for 12 hours, it is filtered out, baked at 100℃-120℃ for 2-3 hours, and baked at 500℃ for 3 hours to obtain Li 3 PMo 12 O 40 -SiO 2 Composite carrier powder.

[0032] 2. Preparation of composite diaphragm

[0033] Stir the PVDF-HFP (polyvinylidene fluoride) copolymer in acetone to obtain a viscous solution. According to PVDF-HFP copolymer and Li 3 PMo 12 O 40 -SiO 2 The composite carrier powder is added with Li in a mass ratio of 10:2 3 PMo 12 O 40 -SiO 2 The composite carrier powder is stirred again, then anhydrous ethanol is added to stir, and finally extruded, stretched, and dried into a film with a thickness of 10-40um.

[0034] The composite diaphragm of this embodiment is used in a battery for testing, and the battery used is:

[0035] Positive electrode: active material lithium ...

Embodiment 2

[0051] The preparation method is:

[0052] 1. Lithium polyoxometalate-SiO 2 Preparation of composite carrier

[0053] SiO 2 The powder was soaked in hydrochloric acid for 3 hours, washed with deionized water, and baked at 300°C for 10 hours. Lithium Phosphotungstate Li 3 PW 12 O 40 Dry at 90°C for 1 hour. SiO 2 Powder in Li 3 PW 12 O 40 Soaked in anhydrous methanol solution for 6 hours and then filtered out, baked at 60°C for 10 hours, and baked at 300°C for 10 hours to obtain Li 3 PW 12 O 40 -SiO 2 Composite carrier powder.

[0054] 2. Preparation of composite diaphragm

[0055] Stir the PVDF-HFP copolymer in acetone at a constant temperature of 50°C for 1 hour to obtain a viscous solution. According to PVDF-HFP copolymer and Li 3 PW 12 O 40 -SiO 2 The composite carrier powder is added with Li in a mass ratio of 10:3 3 PW 12 O 40 -SiO 2 The composite carrier powder was stirred for another 4 hours, anhydrous ethanol was added dropwise and stirred for 30 minutes, and then extrude...

Embodiment 3

[0058] The preparation method is:

[0059] 1. Lithium polyoxometalate-SiO 2 Preparation of composite carrier

[0060] SiO 2 The powder was soaked in hydrochloric acid for 3 hours, washed with deionized water, and baked at 600°C for 2 hours. Lithium Silicotungstate Li 4 SiW 12 O 40 Dry at 40°C for 10 hours. SiO 2 Powder in Li 4 SiW 12 O 40 After being immersed in anhydrous methanol solution for 24 hours, filtered out, baked at 200°C for 1 hour, and baked at 600°C for 2 hours to obtain Li 4 SiW 12 O 40 -SiO 2 Composite carrier powder.

[0061] 2. Preparation of composite diaphragm

[0062] Stir the PVDF-HFP copolymer in acetone at a constant temperature of 50°C for 1 hour to obtain a viscous solution. According to PVDF-HFP copolymer and Li 4 SiW 12 O 40 -SiO 2 The composite carrier powder is added with Li in a mass ratio of 10:5 4 SiW 12 O 40 -SiO 2 The composite carrier powder was stirred for another 24 hours, anhydrous ethanol was added dropwise and stirred for 2 minutes, and t...

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Abstract

The invention discloses a lithium polyoxometallate composite diaphragm for a lithium battery and a preparation method of the diaphragm. The composite diaphragm comprises a PVDF-HFP copolymer, SiO2 and lithium polyoxometallate, wherein the lithium polyoxometallate has a three-dimensional skeleton structure, and lithium ions are combined with anions of lithium polyoxometallate; in the battery charging / discharging process, the lithium ions of the lithium polyoxometallate can be continuously exchanged with the lithium ions in electrolyte, the combination of the diaphragm material with the lithium ions in the electrolyte is realized, the internal resistance of the battery is reduced, and the rate characteristic of the battery is improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a composite diaphragm for lithium batteries and a preparation method thereof, and more specifically, the invention relates to SiO 2 A composite diaphragm with a carrier supporting lithium polyoxometalate salt and a preparation method thereof. Background technique [0002] Lithium batteries are widely used in the market due to their high energy density and long cycle life. As an important part of lithium batteries, the diaphragm plays a vital role. The diaphragm material itself is an insulator, which separates the positive and negative plates in the battery to prevent internal short circuits. At the same time, the micropores penetrate the electrolyte to ensure ion conduction to form a current loop. In actual production, the commonly used diaphragm materials for lithium batteries are polyethylene film (PE), polypropylene film (PP) or three-layer composite film ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/446H01M50/491H01M50/497
CPCH01M50/403H01M50/446Y02E60/10
Inventor 廖小东谢皎王瑨蒋正伟
Owner DONGFANG ELECTRIC CORP LTD
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