化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (9) : 134-137.

科学研究

非化学计量Ni掺杂的LiNi_xV₃O₈水系锂离子电池负极材料研究

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Study on non-stoichiometric Ni-doped LiNi_xV₃O₈ as cathode material for aqueous lithium battery

Zhu Jing^1,2, Di Zhengling^1,2, Yang Mengen^1,2, Liu Yongguang^1,2, Wang Ling^1,2, Dai Lei^1,2

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Received
2018-03-19
Issue Date	Revised Date
2019-10-10	2018-03-19

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摘要

采用溶胶-凝胶法制备出非化学计量镍(Ni)掺杂的钒酸镍锂(LiNi_xV₃O₈)材料,并组装成扣式钒酸镍锂/锰酸锂(LiNi_xV₃O₈/LiMn₂O₄)电池。对制成的材料进行X射线衍射(XRD)分析表明,在Ni掺杂量低于5%(摩尔百分数)条件下,材料主相为层状结构钒酸锂(LiV₃O₈);超过5%,材料会形成钒酸亚镍(NiV₃O₈)相。场发射扫描电子显微镜(FESEM)分析可知,材料为长度700～800nm,宽度400～500nm的薄片状颗粒。从循环伏安谱图中可见两对准可逆的氧化还原峰,分别对应电池充电和放电曲线上的两个充放电平台。适量的Ni掺杂可提高LiNi_xV₃O₈/LiMn₂O₄电池的比容量和循环性能,减缓循环过程的阻抗增长。在Ni掺杂量5%条件下电池性能最佳,其首次放电比容量为93.1mAh/g,50次循环后比容量仍保持70.2mAh/g。

Abstract

Non-stoichiometric Ni-doped lithium nickel vanadate (LiNi_xV₃O₈) materials were prepared by sol-gel method.The materials were prepared into round electrode slices which were assembled into lithium nickel vanadate/lithium manganate (LiNi_xV₃O₈/LiMn₂O₄) button batteries.The X-ray diffraction (XRD) pattern confirmed that the sample with Ni-doping amount less than 5% (molar percentage) showed layered structure like lithium vanadate (LiV₃O₈).The second phase formed as nickel vanadium (NiV₃O₈) when doping amount was more than 5%.Field emission scanning electron microscopy (FESEM) analysis was carried out,which made it clear that the morphology of the material was flake-like particles.The length of the particle was 700～800nm and the width was 400～500nm.According to the cyclic voltammogram,there were two pairs of reversible redox peaks corresponding to the two platforms in each charge and discharge curves of button battery.The specific capacity and cycle performance of LiNi_xV₃O₈/LiMn₂O₄ batteries were improved by appropriate Ni-doped in LiV₃O₈ material.The increase of impedance was also slow down during the charge and discharge cycles.Sample with 5% Ni-doping performed highest specific capacity of 93.1mAh/g at the first discharge cycle,and 70.2mAh/g after 50 cycles.

关键词

水系锂离子电池 / 钒酸锂(LiV₃O₈) / 非化学计量掺杂 / Ni掺杂 / 电化学性能

Key words

aqueous lithium ion battery / lithium vanadate (LiV₃O₈) / non-stoichiometric doping / Ni-doping / electrochemical performance

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非化学计量Ni掺杂的LiNi_xV₃O₈水系锂离子电池负极材料研究[J]. 化工新型材料, 2019, 47(9): 134-137 DOI:

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