High Tunability and Performance of Cylindrical Hybrid Supercapacitors with Binary H₂Ti₁₂O₂₅-Li₄Ti₅O₁₂ Anodes

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• 作者：Jin Hyeon Kim^a ; Jung-Rag Yoon^c ; Seung-Hwan Lee^b ; ^{shlee83@umd.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hybrid supercapacitor ; Binary anodes ; H2Ti12O25 ; Li4Ti5O12 ; Synergistic effect
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：220
• 期：Complete
• 页码：231-236
• 全文大小：2413 K

文摘

We fabricated asymmetric hybrid supercapacitors using binary materials composed of various ratios of H₂Ti₁₂O₂₅ and Li₄Ti₅O₁₂ as anodes and activated carbon as cathodes to investigate the tenability of their electrochemical performances. The binary materials have two advantageous properties: not only outstanding cyclability derived from Li₄Ti₅O₁₂, but also excellent rate ability derived from H₂Ti₁₂O₂₅. Because of these characteristics, hybrid supercapacitors with an 8:2 ratio of Li₄Ti₅O₁₂/H₂Ti₁₂O₂₅ as the anodes show promising electrochemical performance by complementary synergistic effects of H₂Ti₁₂O₂₅ and Li₄Ti₅O₁₂. Thus, we believe that hybrid supercapacitors containing Li₄Ti₅O₁₂/H₂Ti₁₂O₂₅ (8/2) could be used for high-grade energy storage devices that require longevity and ultrahigh electrochemical performance.