Optimized structure stability and electrochemical performance of LiNi0.8Co0.15Al0.05O2 by sputtering nanoscale ZnO film
Optimized structure stability and electrochemical performance of LiNi0.8Co0.15Al0.05O2 by sputtering nanoscale ZnO film
复制标题
DOI：
10.1016/j.jpowsour.2016.01.079
复制
发表时间：
2016-03
影响因子：
9.2
通讯作者：
Y. Lai;Ming Xu;Zhian Zhang;Chunhui Gao;Peng Wang;Ziyang Yu
中科院分区：
文献类型：
--
作者：
Y. Lai;Ming Xu;Zhian Zhang;Chunhui Gao;Peng Wang;Ziyang Yu
LiNi0.8Co0.15Al0.05O2（NCA）是电动汽车锂离子电池（LIB）最有前途的正极材料之一，特斯拉已成功采用该材料。然而，阳离子在电解质中的溶解仍然是主要挑战之一（褪色能力和循环能力差等）。呈现在原始的NCA中。在此，通过磁控溅射（MS）在NCA电极表面直接溅射均匀的纳米ZnO膜。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对ZnO薄膜进行了表征。结果清楚地表明，ZnO薄膜完全且均匀地覆盖在NCA电极上。在1.0C下进行90次循环后，优化的MS-2 min涂层NCA电极的放电容量为169 mAh g− 1，远高于原始NCA电极的127 mAh g −1。此外，在3.0C下的放电容量也达到166 mAh g− 1，而原始电极的放电容量为125 mAh g− 1。电化学性能的改善可以归因于MS ZnO膜的优越性，其降低了电荷转移电阻并保护NCA电极免受阳离子溶解。
LiNi0.8Co0.15Al0.05O2(NCA) is one of the most promising cathode material for lithium-ion batteries (LIBs) in electric vehicles, which is successfully adopted in Tesla. However, the dissolution of the cation into the electrolyte is still a one of the major challenges (fading capacity and poor cyclability,etc.) presented in pristine NCA. Herein, a homogeneous nanoscale ZnO film is directly sputtered on the surface of NCA electrode via the magnetron sputtering (MS). This ZnO film is evidenced by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results clearly demonstrate that ZnO film is fully and uniformly covered on the NCA electrodes. After 90 cycles at 1.0C, the optimized MS-2min coated NCA electrode delivers much higher discharge capacity with 169 mAh g−1than that of the pristine NCA electrode with 127 mAh g−1. In addition, the discharge capacity also reaches 166 mAh g−1at 3.0C, as compared to that of 125 mAh g−1for the pristine electrode. The improved electrochemical performance can be ascribed to the superiority of the MS ZnO film that reduce charge transfer resistance and protect the NCA electrode from cation dissolution.