首页|Zn含量对岩盐型高熵氧化物储锂性能的影响

Zn含量对岩盐型高熵氧化物储锂性能的影响

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用溶液燃烧法制备不同Zn含量的岩盐型高熵氧化物(Co0.22Cu0.22Mg0.22Ni0.22Zn0.12)O、(Co0.2Cu0.2Mg0.2-Ni0.2Zn0.2)O和(Co0.18Cu0.18Mg0.18Ni0.18Zn0.28)O,研究了Zn离子浓度对其电化学性能的影响.结果表明:随着Zn含量的提高这类电极材料的电化学性能随之提高.(Co0.18Cu0.18Mg0.18Ni0.18Zn0.28)O电极具有优异的电化学性能,其原因是较高的晶格畸变和氧空位浓度使其本征电导率和锂离子扩散系数略微提高.电流密度为200mA·g-1时这种材料的初始放电比容量(777.06 mAh·g-1)和循环稳定性(循环150圈后容量保持率接近100％)最高,电流密度为3000 mA·g-1时比容量为140.2 mAh·g1时其倍率性能优异,即使电流密度为1000 mA·g-1其循环150圈(比容量198.1 mAh·g-1)也表现出最高的循环稳定性.(Co0.18Cu0.18Mg0.18Ni0.18Zn0.28)O电极优异的电化学性能和循环稳定性,可归因于Zn元素在氧化还原反应中完全转化,含量较高的Zn提供了更多的容量,适当的氧空位浓度和晶格畸变程度为锂离子传输提供了更多的通道.
Effect of Zn Content on Lithium Storage Properties of Rock Salt Type High Entropy Oxides
Rock salt-type high entropy oxide(Co0.2Cu02Mg0.2Ni0.2Zn0.2)O as anode material for lithium-ion battery has attracted widespread attention due to its unique synergistic effect of multiple elements.Zn and part of Co elements provide the main source of electrode capacities,while MgO stabilizes the crystal structure,Ni,Cu,and the reduced residual Co may form a 3-dimensional network to enhance the conduc-tivities of the oxide.In this study,a series of rock salt-type high entropy oxides(Co0,22Cu0 22Mg0 22Ni0.22Zn0.12)O,(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O and(Co0.18Cu0.18Mg0.18Ni0.18Zn0.28)O with different Zn contents were prepared by solution combustion method,while the effect of Zn ion concentration on the electrochemical performance of rock salt-type HEOs was also assessed.The results suggest that with the increasing Zn content,the elec-trochemical performance of the electrode material was enhanced.Although the(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O electrode exhibits a higher lattice distortion and oxygen vacancy concentration,resulting in a slightly high-er intrinsic conductivity and lithium ion diffusion coefficient,however,the(Co0.18Cu0.18Mg0.18Ni0.18Zn0.28)O electrode showed the most excellent electrochemical performance with the highest initial discharge spe-cific capacity(777.06 mAh·g-1)and cycling stability(capacity retention rate nearly 100％after 150 cycles)at 200 mA·g-1,as well as excellent rate performance(specific capacity of 140.2 mAh·g-1 at 3000 mA·g-1),and it even shows the best cycling stability after 150 cycles at a high current density of 1000 mAh·g-1(specific capacity of 198.1 mAh·g-1).The excellent electrochemical performance of the(Co0.18Cu0.18Mg0.18-Ni0.18Zn0.28)O electrode may be attributed to the complete conversion of Zn element during the redox reac-tion.The higher Zn content is beneficial to increase capacities,while the appropriate oxygen vacancy con-centration and lattice distortion may provide more channels for Li ion migration,thus resulting in higher cy-cle stability of the electrode.

inorganic non-metallic materialslithium-ion batterydifferent Zn contentsrocksalt type high-entropy oxidelattice distortionsynergistic effect

陈诗洁、鲍梦凡、林娜、杨海琴、冒爱琴

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安徽工业大学材料科学与工程学院先进陶瓷研究中心 马鞍山 243032

先进金属材料绿色制备与表面技术教育部重点实验室 马鞍山 243032

无机非金属材料 锂离子电池 不同Zn含量 岩盐型高熵氧化物 晶格畸变 协同作用

先进金属材料绿色制备与表面技术教育部重点实验室主任基金安徽省高校自然科学研究重点项目

GFST2022ZR082023AH051104

2024

10.11901/1005.3093.2023.567

材料研究学报
国家自然科学基金委员会 中国材料研究学会

材料研究学报

CSTPCD北大核心
影响因子：0.605
ISSN：1005-3093
年,卷(期)：2024.38(7)
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