作者:Wang, CY (Wang, Chengyun)[1,2 ]; Yu, L (Yu, Le)[4,5 ]; Fan, WZ (Fan, Weizhen)[4,5 ]; Liu, R (Liu, Rui)[4,5 ]; Liu, JW (Liu, Jiangwen)[1,2 ]; Ouyang, LZ (Ouyang, Liuzhang)[1,2,3 ]; Yang, LC (Yang, Lichun)[1,2 ]; Zhu, M (Zhu, Min)[1,2 ]
查看 ResearcherID 和 ORCID卷:
页:
DOI:
出版年:JUL 30 2018
文献类型:Article
To meet the electrolyte requirements for high-voltage cathode materials, lithium difluorophosphate (LiDFP) is evaluated as a lithium salt additive for the conventional carbonate-based electrolyte system. The LiNi0.5Co0.2Mn0.3O2/graphite pouch cells containing 1 wt% LiDFP delivers a discharge capacity retention of 93.8% over 100 cycles operated at a cut-off voltage of 4.5 V, which is higher than the 43.2% of that without additive; and its average discharge capacity can reach around 118.9 mAh g(-1) at 5 C, while the reference cell only achieves 93.4 mAh g(-1). Herein, the electrochemical impedance spectroscopy results obtained from the two- and three-electrode pouch cells indicate that LiDFP can respectively suppress impedance growth of two electrodes during cycling. The spectroscopic analysis demonstrates that the cathode surface can be modified by the additive and a stable solid electrolyte interface (SEI) is also formed on the anode surface by the presence of LiDFP in the electrolyte. Additionally, the capacity retention for the LiNi0.5Co0.2Mn0.3O2/Si-C pouch cell is also noticeably enhanced from similar to 3.5% to 67.2% by adding 1 wt% LiDFP into the electrolyte over 200 cycles operated at 4.5 V. (C) 2018 Elsevier B.V. All rights reserved.
作者关键词:High voltage; Lithium difluorophosphate; Electrolyte additive; LiNi0.5Co0.2Mn0.3O2-based pouch cell
KeyWords Plus:ION BATTERIES; CYCLING PERFORMANCE; LINI1/3CO1/3MN1/3O2/GRAPHITE CELLS; ELECTROCHEMICAL PERFORMANCE; FLUORINATED ELECTROLYTES; CATHODE MATERIAL; IMPROVE; STABILITY; LINI0.5MN1.5O4; CHEMISTRY
通讯作者地址:Ouyang, LZ (通讯作者)
 | South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China. |
地址:
电子邮件地址:meouyang@scut.edu.cn
| 基金资助机构 | 授权号 |
|---|---|
| Foundation for Innovative Research Groups of the National Natural Science Foundation of China | NSFC51621001 51771075 |
| Science and Technology Projects of Guangzhou | 201604016131 |
| Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme |