A method for assemble a blocking cell to improve that interface contact of the blocking cell

An assembly method and battery assembly technology, which are used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, climate sustainability, etc., can solve problems such as poor interfacial contact of blocked batteries, polymer decomposition, and inaccurate calculation of electrical conductivity, and achieve improved performance. Interface contact, good fit, the effect of avoiding interface contact

Active Publication Date: 2018-12-11
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high rigidity of polycarbonate-based polymers, this leads to poor interfacial contact of blocked cells when testing ionic conductivity, resulting in high interfacial impedance, which makes it impossible to test the impedance spectrum of blocked cells.
Generally, polymers can soften when heated to improve the wettability of the interface; but the thermal stability of polycarbonate polymers is average, and they will lose weight when they are above 120 °C
If the method of increasing the temperature to soften the polymer to improve the interface contact of the blocked battery is likely to cause the decomposition of the polymer or other side reactions, which will seriously affect the correct characterization of the bulk conductivity of the polycarbonate polymer, and the heating softening will also cause Can cause the polymer film to deform and shrink in the thickness direction, leading to inaccurate conductivity calculations

Method used

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  • A method for assemble a blocking cell to improve that interface contact of the blocking cell
  • A method for assemble a blocking cell to improve that interface contact of the blocking cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A blocking battery assembly method for improving the interface contact of the blocking battery, comprising the following steps:

[0025] (1) Cut the PPC-based (polypropylene carbonate) polymer electrolyte membrane supported by a cellulose membrane with a total thickness of 200 μm into a disc with a diameter of 19 mm, and drop-coat it on the positive side of the polymer electrolyte membrane with DMF. Make both sides wet (the coating amount is 0.02mL / cm 2 );

[0026] (2) Two stainless steel sheets with a thickness of 0.8 mm and a diameter of 16 mm are attached to the two surfaces of the polymer electrolyte membrane (disc) to form a blocked battery precursor;

[0027] (3) Air-dry the blocked battery precursor at 60°C for 24 hours, then move it into a vacuum box and dry it at 120°C for 24 hours, and finally package it with shrapnel and 2025 battery case (the installation diagram is shown in figure 1 shown), to obtain the final blocked cell.

[0028] In the glove box, a b...

Embodiment 2

[0032] A blocking battery assembly method for improving the interface contact of the blocking battery, comprising the following steps:

[0033] (1) Cut the PEC (polypropylene carbonate)-based polymer electrolyte membrane with a total thickness of 80um into discs with a diameter of 18mm, and drip-coat the front and back sides of the polymer electrolyte membrane with tetrahydrofuran to make both surfaces wet (coating amount is 0.01mL / cm 2 );

[0034] (2) Two gold sheets with a thickness of 0.5 mm and a diameter of 12 mm are attached to the surface of the polymer electrolyte membrane (disc) to form a blocked battery precursor;

[0035] (3) Dry the blocked battery precursor at 60°C for 30 hours, then move it into a vacuum box and dry it at 120°C for 24 hours, and finally package it with a 2032 battery case to obtain the final blocked battery.

Embodiment 3

[0039] A blocking battery assembly method for improving the interface contact of the blocking battery, comprising the following steps:

[0040] (1) Cut the PVC-based (poly(vinylene carbonate)) polymer electrolyte membrane supported by glass fibers with a total thickness of 120 μm into discs with a diameter of 14 mm, and coat the polymer electrolyte membrane with dimethyl sulfoxide The front and back sides of the front and back, so that both surfaces are wet (the coating amount is 0.04mL / cm 2 );

[0041] (2) Two stainless steel sheets with a thickness of 1.5 mm and a diameter of 12 mm are attached to the surface of the polymer electrolyte membrane (disc) to form a blocked battery precursor;

[0042] (3) Air-dry the blocked battery precursor at 40°C for 48 hours, then move it into a vacuum box and dry at 90°C for 24 hours, and finally package it with a 2025 battery case to obtain the final blocked battery.

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Abstract

The invention discloses a blocking battery assembly method for improving the contact property of the blocking battery interface, which comprises the following steps: (1) treating the front and back sides of a polymer electrolyte membrane with a polar solvent; (2) placing two stainless steel sheets or gold sheets on two sides of the polymer electrolyte membrane treated in the step (1) to form a blocking battery precursor; 3) fully dry that blocking battery precursor and encapsulate the blocking battery by a mold to obtain a blocking battery. The blocking battery assembly method provided by theinvention can improve the contact property of the blocking battery interface, In order to avoid the contradiction that the traditional polymer can not improve the contact property of the interface byhot melting due to the poor thermal stability, the polymer film and blocking electrode can be bonded well when the polymer film is not heated at high temperature, and the non-destructive characterization of the room temperature ionic conductivity of the polycarbonate-based solid electrolyte can be realized.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a blocking battery assembly method for improving the interface contact of the blocking battery. Background technique [0002] Polycarbonate-based polymer solid electrolytes have high room temperature ionic conductivity and excellent electrochemical performance, and have great application prospects in all-solid-state battery technology. In the field of solid electrolyte characterization, the use of blocking cells to test the ionic conductivity of solid electrolytes is the most basic and important test and characterization technique. However, due to the high rigidity of polycarbonate-based polymers, the interfacial contact of the blocked battery is poor when testing the ionic conductivity, resulting in high interface impedance, which makes it impossible to test the impedance spectrum of the blocked battery. Generally, polymers can soften when heated to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 何特特涂飞跃鞠博伟王艳华覃事彪景茂祥杨华陈浩华松沈湘黔
Owner CHANGSHA RES INST OF MINING & METALLURGY
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