LiTi₂(PO₄)₃@carbon/graphene hybrid as superior anode materials for aqueous lithium ion batteries

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• 作者：Zhi Zhou^a ; ^{zhouzhi@hunau.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wei Luo^a ; Hao Huang^a ; Shengxiong Huang^a ; Yongji Xia^a ; Nan Zhou^a ; ^{ilnangua@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Zhangxing He^b
• 关键词：Aqueous lithium ion batteries ; Anode ; Hybrid ; LiTi2(PO4)3 ; Graphene
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：99-105
• 全文大小：1492 K

文摘

In this paper, LiTi₂(PO₄)₃@carbon/graphene (LCG) hybrid was prepared and investigated as anode for aqueous lithium ion batteries (ALIBs). The as-prepared hybrid was characterized by XRD, SEM, TEM and TGA. The electrochemical performances of nano-structured materials as anode were evaluated by cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge tests. The cell using LCG as anode exhibits excellent cycling performance both at relatively low and high rates. The capacity retention of LCG can remain 87.6% at 0.2 C after 200 cycles and 77.2% at 5 C after 1000 cycles compared with LiTi₂(PO₄)₃@carbon (0.2 C: 71.8%, 5 C: 58.1%). Moreover, LCG reveals superior rate capability with 80.8 mA h g⁻¹, 62.1 mA h g⁻¹ at 10 C and 20 C, respectively. The outstanding electrochemical performance of LCG comes from the improved electrical conductivity and the forming of efficient conductive network. The results demonstrate that the graphene-modified LiTi₂(PO₄)₃@carbon is a promising anode for ALIBs.