Measuring Heat Dissipation and Entropic Potential in Battery Cathodes Made with Conjugated and Conventional Polymer
Sun Woong Baek1, Charlene Z Salamat2, Rodrigo Elizalde-Segovia3
1Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California 90095, United States.
ACS Applied Polymer Materials
|May 16, 2024
Summary
This study investigated conjugated polymer binders in lithium-ion batteries, finding they reduce heat generation compared to traditional binders. Electronic conductivity is key at low rates, while ionic conductivity matters more at higher rates.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Traditional poly(vinylidene fluoride) (PVDF) binders are common in lithium-ion batteries.
- Conjugated polymers offer potential as advanced binders due to their conductivity.
Purpose of the Study:
- To evaluate the impact of electronic and ionic conductivities of conjugated polymer binders on lithium-ion battery performance.
- To compare the behavior of novel poly(3,4-propylenedioxythiophene) binders with PVDF in LiNi0.8Co0.15Al0.05O2 (NCA) cathodes.
Main Methods:
- Operando isothermal calorimetry to measure heat generation.
- Entropic potential measurements during battery cycling.
- Synthesis and characterization of homopolymer and copolymer conjugated polymer binders.
Main Results:
- Conjugated polymer binders reduced Joule heating compared to PVDF.
- Binder doping signatures were observed below the LiNi0.8Co0.15Al0.05O2 (NCA) oxidation potential.
- Homopolymer showed lower heat dissipation at low rates (electronic conductivity dominance), while copolymer was better at high rates (ionic conductivity importance).
Conclusions:
- Conjugated polymer binders can enhance lithium-ion battery efficiency by managing heat.
- The relative importance of electronic versus ionic conductivity in binders depends on the cycling rate.
More Related Videos
Related Concept Videos
01:19Calorimetry
3.0K
When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
3.0K
03:02Constant Pressure Calorimetry
85.2K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
85.2K
01:30Electrogravimetric Analysis: Overview
220
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
To test the completeness of the...
220
01:21Voltammetry: Factors Affecting Measurements
155
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
155
03:02Standard Electrode Potentials
43.7K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.7K
02:41Constant Volume Calorimetry
27.1K
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
27.1K