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A lithium battery performance testing system

A test system and battery tester technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low dissolved oxygen in the electrolyte and high cost, and achieve the effect of simple structure, low cost, and accelerated reaction

Active Publication Date: 2017-08-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of methods to complete the Li-O 2 The performance test of the battery: one is to use a traditional coin battery, punch a hole in the positive battery case to connect to O 2 , but lithium dendrites and electrolyte volatilization in traditional lithium batteries are two major factors that plague this method; the other is Swagelok batteries and their modified batteries, but this method faces problems such as the amount of dissolved oxygen in the electrolyte due to material and space issues. low cost, high cost

Method used

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  • A lithium battery performance testing system
  • A lithium battery performance testing system
  • A lithium battery performance testing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1.1 Provide electrolytic cell figure 1 In the shown electrolytic cell, the electrolytic cell includes a cell body, an air inlet pipe communicating with the cell body, a rubber plug for closing the cell body, a capillary, and a positive electrode and a negative electrode, both of which are fixed on the rubber plug. Among them, the height of the cell body is 4.0 cm, the inner diameter is 2.0 cm, the air inlet at the upper end of the air inlet pipe is 1.0 cm higher than the cell body, the distance between the positive and negative electrodes is 1 cm, and the electrolyte is 3 ml.

[0059] The negative electrode is a lithium sheet.

[0060] The positive electrode was prepared as follows: nickel foam was punched into 1cm 2 A circular current collector welded to stainless steel wire; super-P carbon, MnO 2 , PTFE was mixed according to the mass ratio of 6:2:2, diluted with NMP, and ultrasonicated for 10 minutes; the welded nickel foam current collector was dipped into the pas...

Embodiment 2

[0071] 2.1 Provide an electrolytic cell, assemble the electrolytic cell according to the method of Example 1, the capillary is inverted L-shaped, its vertical part is located between the positive electrode and the negative electrode, the capillary is 1.0 cm high, the bottom is close to the bottom of the cell body, and the inner diameter is 0.1 cm. A photo of the electrolytic cell body is shown in Figure 10 shown.

[0072] 2.2 Assemble a lithium battery performance testing system according to the method steps in Example 1, and transfer the electrolytic cell provided in 2.1 to a glove box.

[0073] After ventilating for 20 minutes, the test was carried out at a current density of 80mA / g, and the voltage-specific capacitance curve was obtained, as shown in Figure 11 As shown, curve 1 is the specific capacitance curve of the first charge and discharge, curve 2 is the specific capacitance curve of the second charge and discharge, curve 3 is the specific capacitance curve of the ...

Embodiment 3

[0075]3.1 Provide an electrolytic cell, assemble the electrolytic cell according to the method of Example 1, the capillary is inverted L-shaped, its vertical part is located between the positive electrode and the negative electrode, the capillary is 1.0 cm high, the bottom is close to the bottom of the cell body, and the inner diameter is 0.1 cm. photos such as Figure 12 shown.

[0076] 3.2 Assemble a lithium battery performance testing system according to the method steps in Example 1, and transfer the electrolytic cell provided in 3.1 to a glove box.

[0077] After ventilating for 20 minutes, the test was carried out at a current density of 100mA / g, and the voltage-specific capacitance curve was obtained, as shown in Figure 13 As shown, curve 1 is the specific capacitance curve of the first charge and discharge, curve 2 is the specific capacitance curve of the second charge and discharge, curve 3 is the specific capacitance curve of the third charge and discharge, and cur...

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Abstract

The invention provides a lithium battery performance testing system, comprising a battery tester and an electrolytic cell connected to the battery tester, the electrolytic cell includes a cell body, an air intake pipe communicated with the cell body, and a rubber plug for closing the cell body , and the positive and negative electrodes are fixed on the rubber plug. Compared with the prior art, first of all, the electrolytic cell provided by the present invention is sealed by a rubber plug, which is beneficial to limit the volatilization of the electrolyte, thereby avoiding the decrease in battery performance due to the low dissolved oxygen and the decrease in ion transmission capacity; secondly, through the intake pipe Control O2 to continuously enter the electrolyte in the form of bubbles, so as to provide enough oxygen, electrolyte, and electrode three-phase interface to promote the occurrence of the reaction; thirdly, the active distance between the positive electrode and the negative electrode avoids short circuit of the battery caused by lithium dendrites and other problems; finally, the electrolytic cell provided by the invention has simple structure and low cost.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium battery performance testing system. Background technique [0002] As a representative of modern high-performance batteries, the energy density of lithium-ion batteries has increased by 10-15% in the past 20 years, such as C-LiCoO 2 The energy density of lithium batteries is 420Wh / kg, but due to the limitations of positive and negative electrode materials, the specific energy of lithium batteries is gradually approaching the theoretical limit. Li-O 2 The theoretical energy density of the battery is 5 to 10 times that of the new generation of energy storage system, because its cathode support material (mainly porous carbon) is very light and O 2 It can be freely obtained from the air without being stored in the battery, which can greatly reduce the weight of lithium batteries and reduce operating costs. [0003] Lithium-Oxygen (Li-O 2 ) battery is a lithium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 王宏宇吕蕾蕾齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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