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Weak Acid Solutions

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...

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Construction and Testing of Coin Cells of Lithium Ion Batteries

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Study on Different Water-Based Binders for Li₄Ti₅O₁₂ Electrodes.

Christina Toigo¹, Catia Arbizzani¹, Karl-Heinz Pettinger²

¹Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum Universitá di Bologna, Via F. Selmi 2, 40126 Bologna, Italy.

Molecules (Basel, Switzerland)

|May 28, 2020

Summary

Lithium titanate (Li₄Ti₅O₁₂) electrodes using eco-friendly, water-soluble binders like sodium alginate or carboxymethyl cellulose demonstrate stable performance. This green processing avoids organic solvents, enhancing battery production and safety.

Keywords:

C-rate capability LTO anode environmentally friendly coating lithium ion battery lithium titanium oxide sodium alginate stability test water-based PVDF binder

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Area of Science:

Materials Science
Electrochemistry
Sustainable Chemistry

Background:

Development of advanced electrode materials is crucial for next-generation batteries.
Traditional battery manufacturing often relies on volatile organic compounds (VOCs).
Eco-friendly binders are sought to improve sustainability in battery production.

Purpose of the Study:

To investigate the performance of lithium titanate (Li₄Ti₅O₁₂) electrodes using various water-soluble binders.
To evaluate the electrochemical stability and rate capability of these eco-friendly electrodes.
To assess the feasibility of solvent-free processing for battery manufacturing.

Main Methods:

Coating of Li₄Ti₅O₁₂ active material with different water-soluble binders (sodium alginate, carboxymethyl cellulose, PVDF) onto aluminum foil.
Electrochemical testing in a half-cell configuration against lithium metal (Li).
Performance evaluation including cycle stability at 1 C over 100 cycles and rate capability tests.

Main Results:

Electrodes utilizing solely sodium alginate (SA) or a blend of PVDF/carboxymethyl cellulose (CMC) exhibited the most stable cycling performance.
These binders provided superior cycle stability over 100 cycles at 1 C compared to other formulations.
Electrodes with a PVDF/SA mixture showed significant capacity fading and reduced rate capability.

Conclusions:

Water-soluble binders, particularly SA and CMC, are effective alternatives for fabricating high-performance Li₄Ti₅O₁₂ electrodes.
Solvent-free processing using these binders offers a sustainable and potentially safer approach to battery manufacturing.
Further research into eco-friendly binders and processes is warranted for improved battery production and recycling.