Effects of post-calcination and mechanical pulverization on the electrochemical properties of nano-sized Li₄Ti₅O₁₂ for hybrid capacitors

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• 作者：Byung-Gwan Lee^a ; ^b ; Hyo-Jin Ahn^b ; ^{hjahn@seoultech.ac.kr} ; Jung-Rag Yoon^a ; ^{yoonjungrag@samwha.com}
• 关键词：Li4Ti5O12 ; Lithium titanate ; Post-calcination ; Mechanical pulverization
• 刊名：Current Applied Physics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：17
• 期：2
• 页码：121-125
• 全文大小：1832 K
• 卷排序：17

文摘

In this study, nano-sized particles were successfully prepared by a solid-state reaction with the help of high-energy milling using fine ZrO2 beads. We propose the following three-step process: (1) synthesis of sub-micron sized Li4Ti5O12 by solid-state reaction, (2) pulverization by high energy milling, and (3) crystallinity improvement by post-calcination. Our synthesis approaches using high- energy milling and post-calcination allowed the formation of 100 nm grade Li4Ti5O12 featuring a higher crystallinity than the pristine one prepared by a conventional solid-state reaction at 900 °C. The cyclability of Li4Ti5O12 exhibits capacity retention of 99.9% after 1,500 cycles. The excellent rate capability and cycling performance are mainly attributed to the small particle size and high crystallinity of Li4Ti5O12 prepared by post-calcination.