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Structured electrodes for improved performance of lithium-ion batteries
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Cheng, Chuan (2021) Structured electrodes for improved performance of lithium-ion batteries. In: 2021 MRS Fall Meeting & Exhibition, Boston, Virtual, 6-8 Dec 2021
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Abstract
Electrode structures of commercial lithium-ion cells are isotropic at the macro-scale, comprising a homogenous mixture of constituents including active materials, carbon conductive additives, polymetric binders, and randomly distributed inter-connected porosity. Due to restricted ion mobility in the tortuous pore channels and anisotropic electric-field distribution when in operation, the Li-ion concentration and activation overpotential are inevitably inhomogenous through the electrode thickness, especially at fast charge-discharge rates when the concentration and overpotential gradients become steeper. As a result, the electrochemically active material is inhomogeneously utilized and the reaction rate is spatially varying, which have detrimental effects on battery performance and lifetime, local capacity degradation, overheating and stress concentration. This is an electrode-scale problem, regardless of the specific electrode materials.
We design, manufacture and assess the performance of carefully controlled heterogeneous, graded electrode structures with the aim of promoting greater uniformity in overpotential distribution, and reaction rates across the electrode thickness. We investigate the arising polarization, and impedance behavior, as well as side reactions such as SEI formation. We demonstrate that micro-scale composition-graded electrodes provide enhanced capacity retention at fast charge-discharge rates to mitigate the long-lasting challenge of energy-power trade-off of lithium-ion batteries, and reduce battery degradation rate in both half-cell and full-cell lithium-ion batteries.
Item Type: | Conference Item (Speech) | ||||||
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Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology T Technology > TS Manufactures |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Official Date: | 17 September 2021 | ||||||
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Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Conference Paper Type: | Speech | ||||||
Title of Event: | 2021 MRS Fall Meeting & Exhibition | ||||||
Type of Event: | Conference | ||||||
Location of Event: | Boston, Virtual | ||||||
Date(s) of Event: | 6-8 Dec 2021 | ||||||
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