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Assessment of battery performance: Compared to what?

Test facility for evaluation of battery performance and longevity at Argonne National Laboratory. Credit: Argonne National Laboratory Researchers often have to ask themselves, compared to what? How do we compare the results we produce in the laboratory with those obtained by others? How do we compare theoretical calculations with experimental data? Answering such questions is especially important for researchers and developers of lithium ion batteries. Inventory four decades ago, lithium-ion batteries now run most portable electronics such as laptops and power tools. They are also being developed to meet the requirements for high energy storage for electric vehicles and electricity grids. New designs with different compositions of electrode and electrolyte &#821 1; the two key component components – are constantly on the net. Assessing whether an innovation in electrode or electrolyte material really is an improvement requires comparing it with other test results. However, there is no "standard for all sizes" for battery testing. Methods for testing batteries can vary widely. Argonne battery researcher Ira Bloom notes, "Industrial engineers and researchers from state and academic laboratories often develop their own procedures to characterize lithium ion batteries based on battery technology. Comparison of all technological innovations is extremely complicated." Energy (DOE) Argonne National Laboratory, University of Warwick, OVO Energy, Hawaii National Energy Institute and Jaguar Land Rover have reviewed the literature on the various methods used worldwide to characterize performance of lithium ion batteries to provide insight into best practices. Battery researchers typically use three parameters to define electrochemical performance: capacity,…

Test facility for evaluation of battery performance and longevity at Argonne National Laboratory. Credit: Argonne National Laboratory

Researchers often have to ask themselves, compared to what? How do we compare the results we produce in the laboratory with those obtained by others? How do we compare theoretical calculations with experimental data?

Answering such questions is especially important for researchers and developers of lithium ion batteries. Inventory four decades ago, lithium-ion batteries now run most portable electronics such as laptops and power tools. They are also being developed to meet the requirements for high energy storage for electric vehicles and electricity grids. New designs with different compositions of electrode and electrolyte &#821

1; the two key component components – are constantly on the net.

Assessing whether an innovation in electrode or electrolyte material really is an improvement requires comparing it with other test results. However, there is no “standard for all sizes” for battery testing. Methods for testing batteries can vary widely.

Argonne battery researcher Ira Bloom notes, “Industrial engineers and researchers from state and academic laboratories often develop their own procedures to characterize lithium ion batteries based on battery technology. Comparison of all technological innovations is extremely complicated.” Energy (DOE) Argonne National Laboratory, University of Warwick, OVO Energy, Hawaii National Energy Institute and Jaguar Land Rover have reviewed the literature on the various methods used worldwide to characterize performance of lithium ion batteries to provide insight into best practices.

Battery researchers typically use three parameters to define electrochemical performance: capacity, open voltage and resistance. The capacity is a measure of the total charge stored in a battery. The voltage voltage is the voltage available from a battery without current flow. It represents the maximum voltage of the battery. The resistance is to what extent the component material prevents the flow of electric current, resulting in a voltage drop.

The problem is that researchers can measure these parameters depending on the battery application under different test conditions (temperature, speed of discharge, charging mode etc.) and thus achieve another battery life. Battery power can, for example, be measured with either a direct current or alternating current.

“It’s complicated,” observes Anup Barai, a major researcher and senior researcher at the University of Warwick. “A test’s suitability depends on what the investigator is studying. Our review provides guidance on the most appropriate test method for a given situation.” For that purpose, the team has developed an easy-to-use table comparing eight test methods, including the necessary master equipment, the information generated, and the advantages and disadvantages of each.

“Our hope,” adds Bloom, “is that our results can lead to more reliable comparable methods of testing lithium ion batteries adapted to different applications.”

The study entitled “A comparison of methods for non-invasive characterization of commercial Li-ion cells, “recently appeared in the online version of the journal Progress in Energy and Combustion Science .


Data driven modeling and estimation of lithium ion batteries


More information:
Anup Barai et al., A comparison of methods for non-invasive characterization of commercial Li-ion cells, Progress in Energy and Combustion Science (2019). DOI: 10,1016 / jpecs.2019.01.001

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Argonne National Laboratory

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Evaluation of battery performance: Compared to what? (2019, May 9)
May 9, 2019
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