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A High Capacity Gas Diffusion Electrode for Li-O2 Batteries.
Jenkins, Max; Dewar, Daniel; Lagnoni, Marco; Yang, Sixie; Rees, Gregory J; Bertei, Antonio; Johnson, Lee R; Gao, Xiangwen; Bruce, Peter G.
Afiliación
  • Jenkins M; Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
  • Dewar D; Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
  • Lagnoni M; Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
  • Yang S; Department of Civil and Industrial Engineering, University of Pisa, Pisa, 56122, Italy.
  • Rees GJ; Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
  • Bertei A; Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
  • Johnson LR; Department of Civil and Industrial Engineering, University of Pisa, Pisa, 56122, Italy.
  • Gao X; Nottingham Applied Materials and Interfaces Group, School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, UK.
  • Bruce PG; Future Battery Research Centre, Global institute of Future Technology, Shanghai Jiao Tong University, Shanghai, 200240, China.
Adv Mater ; : e2405715, 2024 Aug 05.
Article en En | MEDLINE | ID: mdl-39101286
ABSTRACT
The very high theoretical specific energy of the lithium-air (Li-O2) battery (3500 Wh kg-1) compared with other batteries makes it potentially attractive, especially for the electrification of flight. While progress has been made in realizing the Li-air battery, several challenges remain. One such challenge is achieving a high capacity to store charge at the positive electrode at practical current densities, without which Li-air batteries will not outperform lithium-ion. The capacity is limited by the mass transport of O2 throughout the porous carbon positive electrode. Here it is shown that by replacing the binder in the electrode by a polymer with the intrinsic ability to transport O2, it is possible to reach capacities as high as 31 mAh cm-2 at 1 mA cm-2 in a 300 µm thick electrode. This corresponds to a positive electrode energy density of 2650 Wh L-1 and specific energy of 1716 Wh kg-1, exceeding significantly Li-ion batteries and previously reported Li-O2 cells. Due to the enhanced oxygen diffusion imparted by the gas diffusion polymer, Li2O2 (the product of O2 reduction on discharge) fills a greater volume fraction of the electrode and is more homogeneously distributed.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Reino Unido Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Reino Unido Pais de publicación: Alemania