Nucleation-growth induced phase transformation during delithiation/lithiation of ‘ultra-small’ LiFePO₄ nanoparticles decorating carbon nanotubes

详细信息    查看全文

• 作者：Mahesh K. Satam ; Rampradesh Natarajan ; Sushobhan Kobi ; Manoj K. Jangid ; Yaadhav Krishnan ; Amartya Mukhopadhyay ; ^{amartya_mukhopadhyay@iitb.ac.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：LiFePO4 nanoparticles ; Carbon nanotubes ; Nanosize effects ; Voltage hysteresis ; First-order phase transformation
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：124
• 期：Complete
• 页码：1-5
• 全文大小：1175 K

文摘

‘Ultra-small’ LiFePO₄ nanoparticles (~ 5 nm) ‘decorating’ multi-walled carbon nanotubes (MWCNTs) have been developed, possibly for the first time, via engineered but facile sol-gel route. During delithiation/lithiation, nucleation-growth induced first-order phase transformation between LiFePO₄ and FePO₄ could be experimentally evidenced, albeit only in the presence of MWCNTs, even for these particle sizes, which are significantly finer compared to the predicted lower limit of ~ 20 nm for complete disappearance of the concerned miscibility gap. This first report on experimental evidences for occurrences of these (LiFePO₄ ↔ FePO₄) phase transformations at such (nano)particle sizes is expected to throw new insights into the still debated phenomenon.