High areal capacity battery electrodes enabled by segregated nanotube networks

Park, Sang-Hoon, King, Paul J, Tian, Ruiyuan, Boland, Conor S, Coelho, João, Zhang, Chuanfang (John), McBean, Patrick, McEvoy, Niall, Kremer, Matthias P, Daly, Dermot, Coleman, Jonathan N and Nicolosi, Valeria (2019) High areal capacity battery electrodes enabled by segregated nanotube networks. Nature Energy. ISSN 1520-8524

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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 (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).

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Subjects: Q Science > QB Astronomy
Depositing User: Alice Jackson
Date Deposited: 24 Jun 2019 15:31
Last Modified: 01 Jul 2019 11:46
URI: http://sro.sussex.ac.uk/id/eprint/84481

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