Preparation of lithium titanate nanoparticles assisted by an ion-exchange process and their electrochemical performance as anode materials for Li-ion batteries
作者:Hye-Jin Hong、Sung-Yun Lee、Sukcheol Kwon、Byung-Su Kim、Sukeun Yoon、In-Su Park
DOI:10.1016/j.jallcom.2021.161296
日期:2021.12
Spinel-structured lithium titanate (Li4Ti5O12, LTO) has received broad attention as a next-generation anode material for Li+-ion batteries because of its excellent safety and long cycle life. However, calcination at the high temperatures (>800 °C) is necessary to obtain spinel-phase LTO. This interferes the synthesis of LTO particles as nano-sized material which is advantageous for electrochemical performance. In
尖晶石结构的钛酸锂(Li 4的Ti 5 ø 12,LTO)已收到了广泛的关注,作为锂的下一代负极材料+ -离子电池,因为它的优异的安全性和循环寿命长的。然而,在高温(> 800 °C)下煅烧是获得尖晶石相 LTO 所必需的。这会干扰 LTO 颗粒作为纳米尺寸材料的合成,这有利于电化学性能。在这项研究中,尖晶石结构的 LTO 纳米颗粒是通过离子交换过程和温和的煅烧温度 (600 ℃) 合成的。首先,通过LiOH∙H 2 O/TiO 2 的煅烧制备Li 2 TiO 3(原子比Li/Ti=2)混合物在600℃。其次,层状Li 2 TiO 3的Li +离子与HCl溶液中的H +离子部分交换,导致合成H x Li 2- x TiO 3 (0 < x < 2)。我们研究了 H/Li 比对 Li 2 TiO 3离子交换过程的影响颗粒和煅烧温度对最终产品相组成的影响。最终产品中的相由离子交换反应和随后的煅