Citation: ZHENG Zhuo, YANG Xiu-Shan, HUA Wei-Bo, TANG Yan. Effective Enhancement of the Electrochemical Performance of Layered Li-Rich Cathode Li_1.5Ni_0.25Mn_0.75O_2.5 by a Facile Molten Salt Method for Lithium-Ion Batteries[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(6): 963-969. doi: 10.11862/CJIC.2017.114 shu

Effective Enhancement of the Electrochemical Performance of Layered Li-Rich Cathode Li_1.5Ni_0.25Mn_0.75O_2.5 by a Facile Molten Salt Method for Lithium-Ion Batteries

ZHENG Zhuo ¹ ,
YANG Xiu-Shan ² ,
HUA Wei-Bo ² ,
TANG Yan ^1,*,,

1.
Polymer Research Institute, Sichuan University, Chengdu 610065, China
2.
School of Chemical Engineering, Sichuan University, Chengdu 610065, China

Corresponding author: TANG Yan, ytang@scu.edu.cn
Received Date: 28 November 2016
Revised Date: 13 April 2017

Figures(7)

A Li-rich Mn-based Li_1.5Ni_0.25Mn_0.75O_2.5 cathode material with excellent electrochemical performance is prepared using a combination of hydroxide co-precipitation and molten salt method. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma-atomic emission spectrometer (ICP-AES), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests are employed to analyze the particle morphology, crystal structure, and electrochemical properties of the as-prepared material. XRD results indicate that this sample has a more ordered α-NaFeO₂ structure (space group R3m), and reduced Li⁺/Ni²⁺ cation mixing. Electrochemical results confirm that this sample has a dramatically decreased initial irreversible capacity loss, and excellent rate performance and cycling stability. Specifically, it delivers a small initial irreversible capacity loss of 50 mAh·g^-1 (the first coulombic efficiency is 84%) between 2.0 and 4.8 V at 0.1C. At 10C rate, it can still exhibit a high discharge capacity of 102 mAh·g^-1. After 100 cycles at 0.5C, the cathode also shows a discharge capacity of 205 mAh·g^-1 with capacity retention of 90%.
- molten salt method,
- hydroxide co-precipitation method,
- Li-rich cathode material,
- electrochemical performance,
- lithium-ion battery
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沈阳化工大学材料科学与工程学院沈阳 110142

Effective Enhancement of the Electrochemical Performance of Layered Li-Rich Cathode Li1.5Ni0.25Mn0.75O2.5 by a Facile Molten Salt Method for Lithium-Ion Batteries

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通讯作者: 陈斌, bchen63@163.com

Effective Enhancement of the Electrochemical Performance of Layered Li-Rich Cathode Li_1.5Ni_0.25Mn_0.75O_2.5 by a Facile Molten Salt Method for Lithium-Ion Batteries