Baohe Yuan, Zheng An, Heng Qi, Jianming Chen, Qi Xu
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引用次数: 0
摘要
随着锂离子电池的发展，高容量和高循环稳定性一直是人们追求的两大目标。最近的研究表明，ZrV2O7 由于导电率低和循环稳定性差，在储能方面表现不佳。事实证明，元素掺杂是提高电化学性能的有效策略。本文采用简单的固相烧结法和快速微波烧结法制备了 Zr0.1Fe0.9V1.1Mo0.9O7（ZFVMO）和 Zr0.1Fe0.9V1.1Mo0.9O7@C（ZFVMO@C）材料。利用 Fe3+/Mo6+、Fe3+/Mo6+ 对 ZrV2O7 中的 Zr4+/V5+进行双离子异价置换，使其具有接近零的热膨胀特性和优异的导电性能。在电化学测试中，ZFVMO 和 ZFVMO@C 的首次放电容量分别为 2261 mA h g-1 和 727 mA h g-1，电池最终在 475 次和 500 次循环中保持稳定。与 ZrV2O7 相比，ZFVMO 的电化学性能有了很大提高。
With the development of lithium-ion batteries, high capacity and high cycle stability have been the two main goals being pursued. Recent studies have shown that ZrV2O7 does not perform well in energy storage due to its low electrical conductivity and poor cycling stability. Elemental doping has proven to be an effective strategy for improving electrochemical performance. In this paper, we prepared Zr0.1Fe0.9V1.1Mo0.9O7(ZFVMO) and Zr0.1Fe0.9V1.1Mo0.9O7@C (ZFVMO@C) materials using a simple solid-phase sintering method and a fast microwave sintering method. Double ionic heterovalent substitution of Zr4+/V5+ in ZrV2O7 using Fe3+/Mo6+, Fe3+/Mo6+ gives it near-zero thermal expansion characteristics and excellent conductive properties. In electrochemical tests, the first discharge capacities of ZFVMO and ZFVMO@C are 2261 mA h g−1 and 727 mA h g−1 respectively, and the batteries were finally stabilized for 475 and 500 cycles. Compared to ZrV2O7, the electrochemical properties of ZFVMO are greatly improved.
期刊介绍：
The Journal of Electrochemical Energy Conversion and Storage focuses on processes, components, devices and systems that store and convert electrical and chemical energy. This journal publishes peer-reviewed archival scholarly articles, research papers, technical briefs, review articles, perspective articles, and special volumes. Specific areas of interest include electrochemical engineering, electrocatalysis, novel materials, analysis and design of components, devices, and systems, balance of plant, novel numerical and analytical simulations, advanced materials characterization, innovative material synthesis and manufacturing methods, thermal management, reliability, durability, and damage tolerance.
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