Type

Journal Article

Authors

Jonathan Coleman

Subjects

Engineering

Topics
cm 1 networks charge transfer electrodes capacity energy storage state of the art lithium ion batteries

High Areal Capacity Battery Electrodes Enabled by Segregated Nanotube Networks (2019)

Abstract Increasing the energy storage capability of lithium-ion batteries necessitates maximization of their areal capacity. This requires thick electrodes performing at near-theoretical specific capacity. However, achievable electrode thicknesses are restricted by mechanical instabilities, with high-thickness performance limited by the attainable electrode conductivity. Here we show that forming a segregated network composite of carbon nanotubes with a range of lithium storage materials (e.g. silicon, graphite and metal oxide particles) suppresses mechanical instabilities by toughening the composite, allowing the fabrication of high-performance electrodes with thicknesses of up to 800 ?m. Such composite electrodes display conductivities up to 104 S m-1 and low charge-transfer resistances, allowing fast charge-delivery and enabling near-theoretical specific capacities, even for thick electrodes. The combination of high thickness and specific capacity leads to areal capacities of up to 45 and 30 mAh cm-2 for anodes and cathodes respectively. Combining optimized composite anodes and cathodes yields full-cells with state-of-the-art areal capacities (29 mAh cm-2) and specific/volumetric energies (480 Wh kg-1 and 1600 Wh L-1).
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Full list of authors on original publication

Jonathan Coleman

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Jonathan Coleman
Trinity College Dublin
Total Publications: 217