Enhanced Cycling and Structure Stability of an Electron Transfer- Accelerating Polymer Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate)-Covered Mn-Based Layered Cathode with Ga3+Doping for a Li-Ion Battery

被引:6
作者
Chen, Feng [1 ]
Dai, Weilong [1 ]
Zhu, Xinqi [1 ]
Yao, Congcong [1 ]
Qian, Junchao [1 ]
Chen, Zhigang [1 ]
Liu, Cheng-bao [1 ]
机构
[1] Suzhou Univ Sci & Technol, Sch Mat Sci & Engn, Jiangsu Key Lab Environm Funct Mat, Suzhou 215009, Peoples R China
基金
国家重点研发计划;
关键词
DIFFERENT CONDUCTIVE POLYMERS; ELECTROCHEMICAL PERFORMANCE; SURFACE MODIFICATION; CAPACITY; NI; LI1.2MN0.54NI0.13CO0.13O2; PEDOTPSS; IMPROVE; VOLTAGE;
D O I
10.1021/acs.langmuir.2c03462
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mn-based cathode material Li1.20Mn0.52Ni0.20Co0.08O2 was proposed and ameliorated by surface-coating poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and doping Ga3+. X-ray diffraction and high-resolution transmission electron microscopy studies revealed that part of Ga3+ replacing the Ni site could reduce the Li+/Ni2+ mixing by forming a well-ordered layered structure and a homogeneous coating layer of PEDOT:PSS is covered on the surface of Li1.20Mn0.52Ni0.19Co0.08Ga0.01O2. The results of the electrochemical studies demonstrated the higher initial charging- discharging Coulombic efficiency, and outstanding rate capabilities and cyclic performance were obtained for the PEDOT:PSScovered and Ga3+-doped samples. Especially, 2 wt % PEDOT:PSScoated Li1.20Mn0.52Ni0.19Co0.08Ga0.01O2 delivered 38.3 mAh g-1, which is larger than the pristine cathode at a 5C high rate. Meanwhile, it could retain 189.6 mAh g-1 (90.3% of its initial discharge capacity at 45 degrees C) after 300 cycles with a 1C rate, while the pristine cathode only delivered 149.7 mAh g-1 with 80.7% cycling retention left. The results strongly suggested that such PEDOT:PSS-coated and Ga3+-doped Mn-based layered structure materials demonstrated high potential as a cathode candidate especially for high-energy applications.
引用
收藏
页码:4662 / 4675
页数:14
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