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Alternative TitleEffect of ZnF2 Coating on Performance of LiNi0.5Mn1.5O4 Cathode Material for Lithium-ion Batteries
谢迪志1; 杨建文1; 陈权启1; 李延伟1; 张灵志1,2
Source Publication精细化工
Abstract采用溶胶-凝胶法制备了LiNi0.5Mn1.5O4正极材料,并利用Zn F2对其表面进行包覆改性。XRD、SEM和TEM测试表明,包覆处理不影响材料的晶体结构,2%(质量分数,以LiNi0.5Mn1.5O4质量计,下同)的Zn F2在LiNi0.5Mn1.5O4表面形成了约7 nm厚均匀包覆层。对未包覆的LiNi0.5Mn1.5O4和1%、2%、3%的Zn F2包覆后的LiNi0.5Mn1.5O4的电化学性能进行了考察,发现Zn F2包覆能够减弱电解液与LiNi0.5Mn1.5O4正极材料之间的相互作用,稳定电极表面,提高材料的电化学性能。其中,2%Zn F2包覆样品表现出最佳的循环性能和倍率性能,0.2C电流倍率下循环200圈后,其放电比容量维持在109.0 m A·h/g,保持率为79.7%;5 C电流倍率下循环500圈后,放电比容量维持在94.2 m A·h/g,保持率为85.6%。
Other AbstractLiNi0.5Mn1.5O4 cathode material was prepared by a sol-gel method,and subsequently coated with ZnF2 as a buffering layer. The obtained products were characterized by XRD,SEM and TEM. The results show that the treatment of ZnF2 coating does not change the structure of LiNi0.5Mn1.5O4. The LiNi0.5Mn1.5O4 coated with 2% ZnF_2( based on mass of LiNi0.5Mn1.5O4 results in the formation of a homogeneous ZnF2 layer of about 7 nm in thickness. The electrochemical performances of the pristine LiNi0.5Mn1.5O4 and LiNi0.5Mn1.5O4 with various amount of ZnF2( 1%,2%,and 3%) were investigated. It is found that coated ZnF2 can weaken the interaction between the electrolyte and LiNi0.5Mn1.5O4 and remarkably stabilize the electrode surface,thus improving the electrochemical performances of LiNi0.5Mn1.5O4. As a result,LiNi0.5Mn1.5O4 with an optimized coating of 2% ZnF2 exhibits the best electrochemical cycling stability and rate performance. The discharge capacity of the sample reaches up to109. 0 m A · h / g with 79. 7% capacity retention at 0. 2 C after 200 cycles. In addition,that is 94. 2m A·h / g and remains 85. 6% of its initial discharge capacity after 500 cycles at 5 C.
KeywordLiNi0.5Mn1.5O4 高电位正极材料 ZnF2 包覆 电化学性能 LiNi0.5Mn1.5O4 high potential cathode material ZnF2 coating electrochemical performance
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Document Type期刊论文
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GB/T 7714
谢迪志,杨建文,陈权启,等. ZnF2包覆对锂离子电池正极材料LiNi0.5Mn1.5O4性能的影响[J]. 精细化工,2017,34(3):279-284.
APA 谢迪志,杨建文,陈权启,李延伟,&张灵志.(2017).ZnF2包覆对锂离子电池正极材料LiNi0.5Mn1.5O4性能的影响.精细化工,34(3),279-284.
MLA 谢迪志,et al."ZnF2包覆对锂离子电池正极材料LiNi0.5Mn1.5O4性能的影响".精细化工 34.3(2017):279-284.
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