Scalable Synthesis Nano-Perovskite K(Mn0.95Ni0.05)F3 Cathode by Homogeneous Precipitation Method for Potassium-Ion Batteries

Shuya Wang; Bin Cui; Quanchao Zhuang; Yueli Shi; Hong Zheng

doi:10.1186/s11671-019-3056-1

Scalable Synthesis Nano-Perovskite K(Mn_0.95Ni_0.05)F₃ Cathode by Homogeneous Precipitation Method for Potassium-Ion Batteries

Nanoscale Res Lett. 2019 Jul 16;14(1):238. doi: 10.1186/s11671-019-3056-1.

Authors

Shuya Wang^{1

2}, Bin Cui³, Quanchao Zhuang⁴, Yueli Shi⁵, Hong Zheng⁶

Affiliations

¹ Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, Shanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry and Materials Science, Northwest University, Xi'an, 710127, China.
² Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China.
³ Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, Shanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry and Materials Science, Northwest University, Xi'an, 710127, China. cuibin@nwu.edu.cn.
⁴ Li-ion Batteries Lab, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, China. zhuangquanchao@126.com.
⁵ Li-ion Batteries Lab, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
⁶ Department of Chemistry, Chongqing Normal University, Chongqing, 401331, China.

Abstract

Potassium-ion batteries (KIBs) are favored by researchers because of the unique advantages. In this work, KIB cathode material nano-perovskite K(Mn_0.95Ni_0.05)F₃ with concentration gradient was synthesized by EDTA-assisted homogeneous precipitation method for the first time and characterized. The solid solution material was deposited on the multi-walled carbon nanotubes (MWCNTs) to form K(Mn_0.95Ni_0.05)F₃/MWCNT nanocomposites to improve the electron conductivity of the electrode material so as to obtain the excellent electrochemical performance. As expected, the charge and discharge capacities of K(Mn_0.95Ni_0.05)F₃/MWCNTs after the 60th cycle can still reach 106.8 and 98.5 mAh g^-1 over the voltage range 4.2-1.2 V vs. K/K⁺ at the current density of 35 mA g^-1, respectively. Electrochemical performance studies showed that solid solution K(Mn_0.95Ni_0.05)F₃ had the potential applications as the cathode material for KIBs. Electrochemical impedance spectroscopy (EIS) was used to study the transport and reaction processes of ions at the solid-liquid interface. The main factors affecting electrochemical performance could be analyzed from the Nyquist plot of the EIS test.

Keywords: Concentration-gradient structure; Electrochemistry; Homogeneous precipitation; Nanoparticles; Potassium-ion batteries.

Abstract

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