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Testing device and testing method for wettability of lithium-ion battery separator

A lithium-ion battery and testing device technology, which is applied to measurement devices, secondary batteries, battery pack components, etc., can solve the problems of high camera accuracy, high cost, and increased battery resistance, and achieves a simple structure of the testing device and high testing efficiency. Simple method, convenient operation effect

Inactive Publication Date: 2018-06-29
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wettability of the separator directly affects the affinity between the separator and the electrolyte, affects the contact area between the separator and the electrolyte, and thus affects the conductivity of lithium ions; poor wettability of the separator will increase the resistance of the battery and affect the cycle performance of the battery and charge and discharge efficiency
[0003] At present, the test of the wettability of the diaphragm mainly includes visual inspection and contact angle measurement with a contact angle meter; the visual inspection method is to use a micro-syringe to absorb the electrolyte, drop it on the diaphragm to be tested, and start timing until the electrolyte completely infiltrates the diaphragm. After that, stop the timing, and judge the wettability of the separator according to the time difference of the soaking time. There is no test standard for the visual method, and it is impossible to quantitatively test the wettability of the separator to the electrolyte; and the method of measuring the contact angle with the contact angle meter, that is, after waiting The electrolyte is dripped on the diaphragm, and the distance and height of the two ends of the drop are measured. According to a certain calculation method, the wettability of the electrolyte to the diaphragm is quantitatively calculated, or the wettability is calculated by capturing the dynamic image of the liquid drop spreading on the surface of the diaphragm. Speed, requires high camera accuracy, high cost, and requires complex formula calculations, no reference standard

Method used

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  • Testing device and testing method for wettability of lithium-ion battery separator

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The shape of the central hollow of the clamping piece is rectangular, 100 mm long and 63.5 mm wide. The diaphragm sample (PP diaphragm) to be tested is fixed on the clamping piece, and the clamping piece 20 is clamped on the top wall 11 of the electrolyte container 10 and between the bottom wall 12; inject 500ml, 1mol / L LiPF6 (solvent is V(EC:DMC)=1:1) solution into the first storage tank, inject 500ml, V(EC: DMC) into the first storage tank DMC)=1:1 mixed solvent; turn on the magnetic stirrer, set the rotating speed to 200r / min, and set the temperature to 25°C; start the timer, record the conductivity of the initial solution in the second storage tank as 0 μs / cm, and then, Record the value of the conductivity every ten minutes for 1.5 hours, and draw the relationship curve of the conductivity with time.

[0038] The test results show that: at 1.5h, the conductivity is 3900μs / cm, and the lithium ion concentration in the second storage tank is measured every half hour by...

Embodiment 2

[0040] The shape of the central hollow of the clamping piece is rectangular, 100 mm long and 63.5 mm wide. The diaphragm sample (PE diaphragm) to be tested is fixed on the clamping piece, and the clamping piece 20 is clamped on the top wall 11 of the electrolyte container 10 and between the bottom wall 12; inject 500ml, 1mol / L LiPF6 (solvent is V(EC:DMC)=1:1) solution into the first storage tank, inject 500ml, V(EC: DMC) into the first storage tank DMC)=1:1 mixed solvent; turn on the magnetic stirrer, set the rotating speed to 200r / min, and set the temperature to 25°C; start the timer, record the conductivity of the initial solution in the second storage tank as 0 μs / cm, and then, Record the value of the conductivity every ten minutes for 1.5 hours, and draw the relationship curve of the conductivity with time.

[0041] The test results show that: at 1.5h, the conductivity is 50100μs / cm, and the lithium ion concentration in the second storage tank is measured every half hour b...

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Abstract

The invention provides a testing device for the wettability of a lithium-ion battery separator. The testing device comprises an electrolyte receiver, a clamping part, a current conducting electrode and a conductivity meter, wherein the electrolyte receiver has an accommodating space and comprises a top wall and a bottom wall; the clamping part is clamped between the top wall and the bottom wall; the clamping part is accommodated in the accommodating space and is used for clamping a to-be-detected separator; the accommodating space is segmented by the clamping part and the separator into a first accommodating groove and a second accommodating groove; the first accommodating groove is used for accommodating lithium salt and a solvent; the second accommodating groove is used for accommodatingthe solvent; one end of the current conducting electrode is accommodated in the second accommodating groove and is immersed into the solvent; the other end of the current conducting electrode is connected with the conductivity meter. The invention also provides a testing method for the wettability of the lithium-ion battery separator. According to the testing device and the testing method for thewettability of the lithium-ion battery separator, provided by the invention, the testing device is simple in structure and convenient to operate; the testing method is simple and high in precision.

Description

【Technical field】 [0001] The invention relates to the technical field of battery manufacturing, in particular to a test device and a test method for the wettability of a lithium-ion battery diaphragm. 【Background technique】 [0002] A lithium-ion battery is mainly composed of a positive electrode, a negative electrode, a separator and an electrolyte. The separator is the core key material of a lithium-ion battery. The performance of the separator determines the interface structure and internal resistance of the lithium-ion battery, which directly affects the capacity, cycle performance and safety performance of the lithium-ion battery. The wettability of the separator directly affects the affinity between the separator and the electrolyte, affects the contact area between the separator and the electrolyte, and thus affects the conductivity of lithium ions; poor wettability of the separator will increase the resistance of the battery and affect the cycle performance of the ba...

Claims

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Application Information

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IPC IPC(8): G01N13/00H01M10/0525H01M2/14H01M50/403
CPCH01M10/0525G01N13/00H01M50/40Y02E60/10
Inventor 何路路王林林春明田雷雷饶睦敏李金林
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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