Name: construction and testing of coin cells of lithium ion batteries
Uploaded: 2012-08-02T13:00:00
Description: Watch this Scientific Journal Video about Construction and Testing of Coin Cells of Lithium Ion Batteries at JoVE.com

We gratefully acknowledge the support from the Ceramics program in Division of Materials Research of the U.S. National Science Foundation, under the grant no. DMR-1006515 (program manager, Dr. Lynnette D. Madsen).

1. Preparation of a Working Electrode
<ol>
 <li>Prepare a mixture of ~6 wt. % polyvinylidene fluoride (PVDF) binder in N-methyl-2-pyrrolidone (NMP).</li>
 <li>Weigh 80 wt. % active material (LiCoO2 in this case) and 10 wt. % C black (acetylene, 99.9+ %) and then mix them in a vortex for 1 min.</li>
 <li>Add NMP-binder mixture such that the binder constitutes 10 wt. % of the total weight of the mixture.</li>
 <li>Transfer the above mixture into a small glass vial and mix in the vortex mixer at maximum rpm for...

<ol>
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In our experience, the most critical step in the preparation of the working electrode is making good slurries with consistency. As shown in Figure 4, excess NMP in the slurry can result in a cracked coating, while insufficient NMP can result in a porous coating. In the work presented here, CR2032 coin cell cases that are 20 mm in diameter are used. It should be noted that coin cell cases of different sizes can be used, where the electrode sizes should be varied accordingly. During cell assembly, the appr...

<table border="1">
 <tbody>
 <tr>
 <td>Name of the reagent</td>
 <td>Company</td>
 <td>Catalogue number</td>
 </tr>
 <tr>
 <td>Poly(vinylidene fluoride)</td>
 <td>Sigma-Aldrich</td>
 <td>182702</td>
 </tr>
 <tr>
 <td>1-Methyl-2-pyrrolidinone, 99.5%</td>
 <td>Alfa Aesar</td>
 <td>31903</td>
 </tr>
 <tr>
 <td>LiCoO2</td>
 <td>Alfa Aesar</td>
 <td>42090</td>
 </tr>
 <tr>
 <td>Carbon black, acetylene, 99.9+%</td>
 <td>Alfa Aesar</td>
 <td>39724</td>
 </tr>
 <tr>
 <td>LiPF6 in EC:DMC:DEC</td>
 <td>MTI Corporation</td>
 <td>EQ-Be-LiPF6</td>
 </tr>
 <tr>
 <td>Celgard separator</td>
 <td>Celgard</td>
 <td>C480</td>
 </tr>
 <tr>
 <td>Analog Vortex Mixer</td>
 <td>VWR </td>
 <td>58816-121</td>
 </tr>
 <tr>
 <td>Vacuum oven</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Vacuum pump</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Hydraulic press</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Coin cell case</td>
 <td>MTI Corporation</td>
 <td>EQ-CR2032-CASE-304</td>
 </tr>
 <tr>
 <td>Spring and spacer</td>
 <td>MTI Corporation</td>
 <td>EQ-CR20SprSpa-304</td>
 </tr>
 <tr>
 <td>Glovebox</td>
 <td>mBraun</td>
 <td>UNILAB</td>
 </tr>
 <tr>
 <td>Battery tester</td>
 <td>Arbin Instruments</td>
 <td>BT2143 </td>
 </tr>
 </tbody>
</table>

construction and testing of coin cells of lithium ion batteries

Rechargeable lithium ion batteries have wide applications in electronics, where customers always demand more capacity and longer lifetime. Lithium ion batteries have also been considered to be used in electric and hybrid vehicles1 or even electrical grid stabilization systems2. All these applications simulate a dramatic increase in the research and development of battery materials3-7, including new materials3,8, doping9, nanostructuring10-13, coatings or surface modifications14-17 and novel binders18. Consequently, an increasing number of physicists, chemists and materials scientists have recently ventured into this area. Coin cells are widely used in research laboratories to test new battery materials; even for the research and development that target large-scale and high-power applications, small coin cells are often used to test the capacities and rate capabilities of new materials in the initial stage. 
 In 2010, we started a National Science Foundation (NSF) sponsored research project to investigate the surface adsorption and disordering in battery materials (grant no. DMR-1006515). In the initial stage of this project, we have struggled to learn the techniques of assembling and testing coin cells, which cannot be achieved without numerous help of other researchers in other universities (through frequent calls, email exchanges and two site visits). Thus, we feel that it is beneficial to document, by both text and video, a protocol of assembling and testing a coin cell, which will help other new researchers in this field. This effort represents the "Broader Impact" activities of our NSF project, and it will also help to educate and inspire students.
In this video article, we document a protocol to assemble a CR2032 coin cell with a LiCoO2 working electrode, a Li counter electrode, and (the mostly commonly used) polyvinylidene fluoride (PVDF) binder. To ensure new learners to readily repeat the protocol, we keep the protocol as specific and explicit as we can. However, it is important to note that in specific research and development work, many parameters adopted here can be varied. First, one can make coin cells of different sizes and test the working electrode against a counter electrode other than Li. Second, the amounts of C black and binder added into the working electrodes are often varied to suit the particular purpose of research; for example, large amounts of C black or even inert powder were added to the working electrode to test the "intrinsic" performance of cathode materials14. Third, better binders (other than PVDF) have also developed and used18. Finally, other types of electrolytes (instead of LiPF6) can also be used; in fact, certain high-voltage electrode materials will require the uses of special electrolytes7.

Watch this Scientific Journal Video about Construction and Testing of Coin Cells of Lithium Ion Batteries at JoVE.com

Construction and Testing of Coin Cells of Lithium Ion Batteries

A protocol to construct and test coin cells of lithium ion batteries is described. The specific procedures of making a working electrode, preparing a counter electrode, assembling a cell inside a glovebox and testing the cell are presented.

Rechargeable lithium ion batteries have wide applications in electronics, where customers always demand more capacity and longer lifetime.  Lithium ion ...

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