纳米结构的LiNi_(0.5)Mn_(1.5)O_(4-δ)正极材料中倍率性能与形貌的依赖关系

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英文篇名：Morphology-dependent Rate Performance in Nanostructured High Voltage LiNi_(0.5)Mn_(1.5)O_(4-δ) Cathode Materials 作者：赵霞 ; 李玉 英文作者：Zhao Xia;Li Yu;Tianjin Lishen Battery Joint-Stock Co.LTD.; 关键词：LiNi_(0.5)Mn_(1.5)O_4 ; 形貌 ; 倍率性能 英文关键词：LiNi_(0.5)Mn_(1.5)O_4;;Morphology;;Rate performance 中文刊名：电源世界 英文刊名：The World of Power Supply 机构：天津力神电池股份有限公司; 出版日期：2019-04-15 出版单位：电源世界 年：2019 期：02 语种：中文; 页：39-42 页数：4 ISSN：1561-0349 分类号：TB383.1;TM912

摘要

本文通过氨水调节的碳酸盐共沉淀法合成了纳米结构的Fd-3m空间群的LiNi_(0.5)Mn_(1.5)O_(4-δ)样品,烧结时间分别是10h, 15h和30h。实验结果表明烧结时间为10h的样品一次颗粒尺寸最小,有最好的倍率性能。该样品在0.1 C循环5周后比容量可以达到146mAh g~(-1),在0.5 C循环2周后,比容量可以保持135.3mAhg~(-1)。结合容量电压微分曲线,我们进一步发现烧结时间为10h的样品电极极化程度最小。除此之外,电化学阻抗谱也证实了烧结时间为10h的样品的电荷转移电阻最小,表明该LiNi_(0.5)Mn_(1.5)O_(4-δ)电极在充放电过程中有更好的锂离子脱嵌动力学。
        A series of nano-structured LiNi_(0.5)Mn_(1.5)O_4 samples with Fd-3 m space group were synthesized by using ammonia-mediated carbonate precipitation method as a function of calcination time(10 h, 15 h and 30 h). The experimental results demonstrate that the LiNi_(0.5)Mn_(1.5)O_4 cathode synthesized for 10 h with smallest primary particle size present the best rate performance. This sample delivers a capacity of 146 mAh g-1 after 5 cycles at 0.1 C, retaining 135.3 mAh g-1 after 2 cycles at 0.5 C. Combined with differential curves, the morphology with smallest primary particle size is favorable for reducing the electrode polarization. In addition, the LiNi_(0.5)Mn_(1.5)O_4 electrode calcined for 10 h shows lowest charge-transfer resistance among all samples, suggesting that the LiNi_(0.5)Mn_(1.5)O_4 electrodes have fastest lithium insertion/extraction kinetics during charging-discharging.

引文

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