Electrochemical evaluation of LiZn_xMn_2−xO₄ (x≤0.10) cathode material synthesized by solution combustion method

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• 作者：Wangqiong Xu^a ; ^b ; Qiling Li^a ; ^b ; Junming Guo^a ; ^b ; ^{guojunming@tsinghua.org.cn" class="auth_mail" title="E-mail the corresponding author} ; Hongli Bai^a ; ^b ; Chang-wei Su^a ; ^b ; Rongsheng Ruan^a ; ^b ; Jinhui Peng^a ; ^b
• 关键词：Solution combustion method ; Zn-doping ; LiMn2O4 ; Cathode material ; Li-ion batteries
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：5693-5698
• 全文大小：781 K

文摘

The spinel LiZn_xMn_2−xO₄ (x≤0.10) cathode materials have been synthesized by solution combustion method at 600 °C for 3 h. The structure and the morphology of LiZn_xMn_2−xO₄ were characterized by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. All the obtained samples were identified as the spinel structure of LiMn₂O₄, the lattice parameters of samples decreased and the particle size increased as the Zn content increased. The effects of Zn-doping on the electrochemical characteristics of LiMn₂O₄ were investigated by galvanostatic charge–discharge experiments, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Among them, LiZn_0.05Mn_1.95O₄ particles presented outstanding cycling stability with a capacity retention of 82.9% at a discharge rate of 1 C (1 C=148 mA h g⁻¹) after 500 cycles. Spinel LiZn_0.05Mn_1.95O₄ had reversible cycling performance, revealing that doping LiMn₂O₄ with Zn improves its electrochemical performance.