Creation of a Coin-Cell Battery

By

Jared Hanley

Mentor: Dr. Quinton L. Williams

Mid-Term Aim

Learn the basics of C++ Programming

Extract data columns from large text files and perform algebraic computations with them.

Become familiar with the materials science of batteries.

Develop a recipe for the anode of Coin-Cell using three ingredients.

Long-Term Objective

Modify LiFePO₄ to create a cathode with enhanced conductivity features.

Understand the electrochemistry behind the Coin-Cell battery.

Obtain hands-on experience in the assembly of the battery from initial materials.

Complete a fully-functional, efficient battery.

Coin-Cell Batteries are used in many small scale applications.

They provide optimal voltage for small electronics.

Compact enough for portable devices such as watches, hearing aids, calculators, laser pointers, etc.

How does a Battery Work?

Inside the Coin-Cell (CR2032)

Goal:

Maximize the battery’s voltage through the potentials in the materials.

Anode: PVDF, NMP, Super C45 on Copper

Cathode: Addition of LiFePO₄

Pieces to the Puzzle

Common Lab Equipment

Ingredients we are using:

Anode Consist of:

PVDF – Polyvinylidene fluoride

NMP – N-Methyl-2-pyrrolidone Carbon Black – Super C45

Raman Spectrum on Carbon Black

D- Band

G- Band

Carbon Signature

Experimental Weight Percentages

95% Super C45 5.0% PVDF PVDF (5,000 cps)

Carnage of Anode Slurries

Cathode

Active Ingredient LiFePO₄

Advantages:

Thermal Stability

Long-Life Span

Great Cyclability

Low Toxicity

Carbon Coating on the LiFePO₄

Increases electrochemical performance

Increases ionic conduction

Helps transport electrons quicker during charge and discharge.

Initial Results of Raman Spectrum

Actual Raman Spectra (457.5 μm)

Bai, Y. et al., “Raman study of pure, C-coated and Co-doped LiFePO4”, J. Raman Spectrosc., (31 March 2011): 835. Print.

Experimental Weight Percentages

94.5% LiFePO₄3.5% PVDF2.0% C45

Thank You for being such a great audience!