Nickel phosphate nanorod-enhanced polyethylene oxide-based composite polymer electrolytes for solid-state lithium batteries

• Published in: Journal of colloid and interface science Vol. 565; pp. 110 - 118
• Main Authors: Wu, Zhijun, Xie, Zhengkun, Yoshida, Akihiro, Wang, Jing, Yu, Tao, Wang, Zhongde, Hao, Xiaogang, Abudula, Abuliti, Guan, Guoqing
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.04.2020
• Subjects: anodes; composite polymers; crystal structure; dendrites; electrochemistry; electrolytes; High ionic conductivity; Interface stability; lithium; lithium batteries; nanorods; nickel; Nickel phosphate; phosphates; polyethylene; polyethylene glycol; Polymer electrolyte; Solid state battery; Polymer electrolyte; High ionic conductivity; Interface stability; Solid state battery; Nickel phosphate
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2020.01.005

[Display omitted] •PEO-LiTFSI-3%VSB-5 electrolyte exhibits high conductivity of 4.83 × 10−5 S·cm−1 at 30 °C.•PEO-LiTFSI-3%VSB-5 electrolyte shows better interface stability with lithium.•The batteries with PEO-LiTFSI-3%VSB-5 exhibit excellent electrochemical property.•VSB-5 can change the polymer arrangement and decrease the crystallinity. Solid-state electrolytes with high ionic conductivity, large electrochemical window, and excellent stability with lithium electrode are needed for high-energy solid-state lithium batteries. In this work, a novel polyethylene oxide (PEO)-Lithium bis(trifluoromethylsulphonyl)imide (LiTFSI)-nanocomposite-based polymer electrolyte was prepared by using nickel phosphate (VSB-5) nanorods as the filler. The ionic conductivity of the obtained PEO-LiTFSI-3%VSB-5 solid polymer electrolyte was found to be as high as 4.83 × 10−5 S·cm−1 at 30 °C and electrochemically stable up to about 4.13 V versus Li/Li+. The enhanced ionic conductivity was attributed to the reduced crystallinity of the PEO and the interaction between VSB and 5 and PEO-LiTFSI. In addition, the solid polymer electrolyte exhibited improved compatibility to the lithium metal anode with excellent suppression of lithium dendrites. The assembled LiFePO4/Li battery with the PEO-LiTFSI-3%VSB-5 solid polymer electrolyte showed better rate performance and higher cyclic stability than the PEO-LiTFSI electrolyte. It is demonstrated that this new solid polymer hybrid should be a promising electrolyte applied in solid state batteries with lithium metal electrode.