Na⁺ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling Public Deposited

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http://ir.library.oregonstate.edu/concern/articles/fj2363897

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  • Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling
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  • Sodium-ion batteries are emerging as a highly promising technology for large-scale energy storage applications. However, it remains a significant challenge to develop an anode with superior long-term cycling stability and high-rate capability. Here we demonstrate that the Na⁺ intercalation pseudocapacitance in TiO₂/graphene nanocomposites enables high-rate capability and long cycle life in a sodium-ion battery. This hybrid electrode exhibits a specific capacity of above 90mAh g⁻¹ at 12,000mAg⁻¹ (≈36 C). The capacity is highly reversible for more than 4,000 cycles, the longest demonstrated cyclability to date. First-principle calculations demonstrate that the intimate integration of graphene with TiO₂ reduces the diffusion energy barrier, thus enhancing the Na⁺ intercalation pseudocapacitive process. The Na-ion intercalation pseudocapacitance enabled by tailor-deigned nanostructures represents a promising strategy for developing electrode materials with high power density and long cycle life.
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  • Chen, C., Wen, Y., Hu, X., Ji, X., Yan, M., Mai, L., ... & Huang, Y. (2015). Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling. Nature communications, 6:6929. doi:10.1038/ncomms7929
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-06-10T15:13:26Z (GMT) No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitance.pdf: 4527722 bytes, checksum: 713b8895bf35256711947e8ac063a647 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitanceSupplementaryInformation.pdf: 2396495 bytes, checksum: eafd40835060c42ca9c549e4569aa906 (MD5)
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-06-10T15:12:59Z No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitance.pdf: 4527722 bytes, checksum: 713b8895bf35256711947e8ac063a647 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitanceSupplementaryInformation.pdf: 2396495 bytes, checksum: eafd40835060c42ca9c549e4569aa906 (MD5)
  • description.provenance : Made available in DSpace on 2015-06-10T15:13:26Z (GMT). No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitance.pdf: 4527722 bytes, checksum: 713b8895bf35256711947e8ac063a647 (MD5) JiXiuleiChemistrySodiumIntercalationPseudocapacitanceSupplementaryInformation.pdf: 2396495 bytes, checksum: eafd40835060c42ca9c549e4569aa906 (MD5) Previous issue date: 2015-04

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