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Improved electrochemical performance of 5 V spinel LiNi 0.5Mn 1.5O 4 by La 2O 3 surface coating for Li-ion batteries

机译:La 2 O 3 <1>改善5 V尖晶石LiNi 0.5 Mn 1.5 O 4 的电化学性能/ sub>锂离子电池的表面涂层

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LiNi_(0.5)Mn_(1.5)O_(4)coated with 1.5 wt.% La_(2)O_(3)was prepared and investigated as cathode materials for lithium ion batteries. The samples was characterized by XRD, SEM and EDX. After the 1.5 wt.% La_(2)O_(3)coating, the lattice structure of LiNi_(0.5)Mn_(1.5)O_(4)is not destroyed and a La_(2)O_(3)coating layer has formed on the surface of LiNi_(0.5)Mn_(1.5)O_(4)particles. The 1.5 wt.% La_(2)O_(3)-coated LiNi_(0.5)Mn_(1.5)O_(4)exhibits a higher rate capacity, with discharge capacity between 3.5 and 5 V of 131.9, 127.1, 126.5, 120.7, 114.1 and 101.5 mAh g~(-1)at rates of 0.2, 0.5, 1, 2, 3 and 5 C (1 C = 140 mAh g~(-1)), respectively. The results indicate that the La_(2)O_(3)coating could reduce the electrode polarization and enhance the rate capacities.
机译:制备了涂覆有1.5重量%La_(2)O_(3)的LiNi_(0.5)Mn_(1.5)O_(4),并研究了其为锂离子电池的正极材料。通过XRD,SEM和EDX对样品进行表征。在1.5重量%的La_(2)O_(3)涂层之后,LiNi_(0.5)Mn_(1.5)O_(4)的晶格结构没有被破坏,并且在其上形成了La_(2)O_(3)涂层。 LiNi_(0.5)Mn_(1.5)O_(4)颗粒的表面。 1.5 wt。%La_(2)O_(3)涂层的LiNi_(0.5)Mn_(1.5)O_(4)具有更高的倍率容量,放电容量在3.5至5 V之间为131.9、127.1、126.5、120.7,分别以0.2、0.5、1、2、3和5 C(1 C = 140 mAh g〜(-1))的速率分别达到114.1和101.5 mAh g〜(-1)。结果表明,La_(2)O_(3)涂层可以减少电极极化并提高倍率容量。

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