Semco university – All about the Lithium-Ion Batteries

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Dry goods Lithium button battery assembly and test – Semco University

dry-goods-lithium-button-battery-assembly-semco-university
Introduction

Some batteries are regulated as dangerous goods because they may pose hazards during transport. These hazards include: Leaks of corrosive liquid or other material that can injure people or harm the environment. In this article we will discuss about – Dry Goods Lithium Button Battery Assembly & Test.

1. Button Battery Preparation & Assembly

  1. Positive ingredient active material:  PVDF:  Conductive agent (acetylene black) = 8: 1: 1
  2. Negative active material: PVDF: conductive agent (acetylene black) = 7: 2: 1
  3. Solvent NMP is determined according to material conditions, empirical value
  4. Coating is s imply coated with a coating sample maker
  5. Dry naturally at 60 °C, vacuum dry at 1 10 °C (24 h). I f the water molecules are in the material lattice, the drying temperature is 60 – 70 °C 5 Put the positive and negative electrodes into the vacuum glove box for assembly

Note: 1.) Regardless of the positive electrode material or the negative electrode material, they are assembled as the positive electrode, and the lithium sheet is the negative electrode

2.) 2016 and 2025 lithium button battery assembly diagram is as follows

dry-goods-lithium-button-battery-assembly-sequence-semco-university
Schematic Diagram of the Assembly Sequence of the Button Battery

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2. Cyclic Voltammetry (CV method) Test Steps for Button Cells

  1. Using a three- electrode system, the working electrode (green) is connected to the positive electrode, and the reference electrode (white) and the counter electrode (red) are connected to the negative electrode
  2. Open the electrochemical workstation, click Control— Open circuit potential OCV, and record the open circuit potential.
  3. Then select Cyclic Voltammetry CV.
  4. Parameter setting: The Initial potential I unit is OCV potential, the high potential High is 5 V, the low potential Low is 1. 5 V, the final potential Final is 5 V, the sensitivity is 1e – 6, and the scanning speed scan rate is 0.1mV/s.
  5. Click Run

3. Button Battery AC Impedance Test Steps

  1. Using a three-electrode system, the working electrode (green) is connected to the positive electrode, and the reference electrode (white) and the counter electrode (red) are connected to the negative electrode,
  2. Open the electrochemical workstation, click Control— Open Circuit Potential, and record the open circuit potential,
  3. Then, select the AC impedance EIS.
  4. Parameter setting: The Initial potential is OCV potential, the high frequency is 1 e- 5 Hz, the low frequency is 1 e- 1 Hz, and the amplitude Amplitude< 10 m V.
  5.  Click Run.

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Note: 1.) EIS test should be carried out before and after the Lithium charge cycle,

2.) Data analysis uses Z view professional software for fitting and analysis of Li+ transition in different phases,

3.) The fitting circuit diagrams of different EIS diagrams are as follows

eis-fitting-circuit-semco-university
EIS fitting Circuit
eis-fitting-circuit-semco-university
EIS fitting Circuit

4. Button Battery Charge and Discharge Test Steps

  1. Turn on the charging and discharging instrument and set the step: 0. 2 C,
  2. The tested capacity is the positive and negative capacity.

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Cell BMS Pack Failure Analysis,
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Basic Knowledge of Lithium-ion Battery Commercialization,
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