High Areal Capacity Battery Electrodes Enabled by Segregated Nanotube Networks (1).pdf (991.57 kB)
High areal capacity battery electrodes enabled by segregated nanotube networks
journal contribution
posted on 2023-06-07, 06:36 authored by Sang-Hoon Park, Paul J King, Ruiyuan Tian, Conor Boland, João Coelho, Chuanfang (John) Zhang, Patrick McBean, Niall McEvoy, Matthias P Kremer, Dermot Daly, Jonathan N Coleman, Valeria NicolosiIncreasing 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 (for example, 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?µm. Such composite electrodes display conductivities up to 1?×?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 1,600?Wh?l-1).
History
Publication status
- Published
File Version
- Accepted version
Journal
Nature EnergyISSN
2058-7546Publisher
Springer NatureExternal DOI
Issue
7Volume
4Page range
560-567Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Materials Physics Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-06-24First Open Access (FOA) Date
2019-12-17First Compliant Deposit (FCD) Date
2019-06-21Usage metrics
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