镁掺杂高镍三元正极材料LiNi0.90Co0.05Mn0.05O2的合成与性能

O646.5; 采用高温固相法合成了一系列不同含量Mg掺杂的LiNi0.90Co0.05Mn0.05O2正极材料,并通过X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱等表征手段对其物相结构、颗粒形貌及电化学性能进行了研究.结果表明,掺杂Mg元素虽然会降低材料的可逆容量,但是可扩大材料晶胞体积,抑制不可逆相变,改善电极与电解液的界面稳定性,可有效提升材料的循环稳定性.其中,3％摩尔分数掺杂量的LiNi0.90Co0.05Mn0.05O2正极材料结构稳定,容量损失较少,综合性能表现较好,在0.1 C、2.8-4.3 V电压范围内,首周充放电比容量达到了 197.3mA.h/g,100...

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Published in应用化学 Vol. 41; no. 4; pp. 568 - 576
Main Authors 陈胜, 胡祖飞, 曹洪美, 赵振华, 张宇栋
Format Journal Article
LanguageChinese
Published 湖南久日新材料有限公司,怀化 418200%江苏科技大学能源与动力学院,镇江 212100%江苏科技大学材料科学与工程学院,镇江 212100 01.04.2024
Subjects
Lithium-ion batteries
Electrochemical performance
正极材料
锂离子电池
元素掺杂
电化学性能
Element doping
Cathode materials
Online AccessGet full text
ISSN1000-0518
DOI10.19894/j.issn.1000-0518.230291

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Abstract O646.5; 采用高温固相法合成了一系列不同含量Mg掺杂的LiNi0.90Co0.05Mn0.05O2正极材料,并通过X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱等表征手段对其物相结构、颗粒形貌及电化学性能进行了研究.结果表明,掺杂Mg元素虽然会降低材料的可逆容量,但是可扩大材料晶胞体积,抑制不可逆相变,改善电极与电解液的界面稳定性,可有效提升材料的循环稳定性.其中,3％摩尔分数掺杂量的LiNi0.90Co0.05Mn0.05O2正极材料结构稳定,容量损失较少,综合性能表现较好,在0.1 C、2.8-4.3 V电压范围内,首周充放电比容量达到了 197.3mA.h/g,100周的循环保持率达到了93.6％,且5 C下放电比容量为161.1 mA·h/g.
AbstractList O646.5; 采用高温固相法合成了一系列不同含量Mg掺杂的LiNi0.90Co0.05Mn0.05O2正极材料,并通过X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱等表征手段对其物相结构、颗粒形貌及电化学性能进行了研究.结果表明,掺杂Mg元素虽然会降低材料的可逆容量,但是可扩大材料晶胞体积,抑制不可逆相变,改善电极与电解液的界面稳定性,可有效提升材料的循环稳定性.其中,3％摩尔分数掺杂量的LiNi0.90Co0.05Mn0.05O2正极材料结构稳定,容量损失较少,综合性能表现较好,在0.1 C、2.8-4.3 V电压范围内,首周充放电比容量达到了 197.3mA.h/g,100周的循环保持率达到了93.6％,且5 C下放电比容量为161.1 mA·h/g.
Abstract_FL A series of Mg-doped LiNi0.90Co0.05Mn0.05O2 cathode materials are synthesized via a high-temperature solid-phase method.The phase structure,particle morphology,and electrochemical properties of the doped LiNi0.90Co0.05Mn0.05O2 cathode materials are investigated using the X-ray diffraction,scanning electron microscope,transmission electron microscope,and X-ray photoelectron spectroscopy.The test results demonstrate that while Mg doping reduces the reversible capacity of the cathode,it expands the lattice volume,inhibits irreversible phase transitions,improves electrode-electrolyte interface stability,and effectively enhances cycle stability.Among the samples,the LiNi0.90Co0.05Mn0.05O2 cathode material with 3％Mg molar doping amount exhibits a stable structure with less capacity loss and superior overall performance.The discharge specific capacity of the sample at the first cycle reaches 197.3 mA·h/g at 0.1 C in the voltage range of 2.8～4.3 V.Furthermore,it achieves a remarkable cycle retention rate of 93.6％after 100 cycles and maintains a high discharge specific capacity at 5 C(161.1 mA·h/g).
Author 胡祖飞
赵振华
张宇栋
曹洪美
陈胜
AuthorAffiliation 湖南久日新材料有限公司,怀化 418200%江苏科技大学能源与动力学院,镇江 212100%江苏科技大学材料科学与工程学院,镇江 212100
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Author_FL CHEN Sheng
ZHANG Yu-Dong
ZHAO Zhen-Hua
CAO Hong-Mei
HU Zu-Fei
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DocumentTitle_FL Synthesis and Properties of Mg-Doped Ni-Rich Ternary Cathode Material LiNi0.90Co0.05Mn0.05O2
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Keywords Lithium-ion batteries
Electrochemical performance
正极材料
锂离子电池
元素掺杂
电化学性能
Element doping
Cathode materials
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