Related Experiment Video
Updated: May 21, 2025
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
Dynamic doping and interphase stabilization for cobalt-free and high-voltage Lithium metal batteries
Ziqing Yao1, Tianji Fu1, Tao Pan1
1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China.
Nature Communications
|March 22, 2025
Summary
Ferrocene hexafluorophosphate enhances lithium-ion battery stability by doping electrodes with iron and forming protective interphases. This additive improves cycling and rate performance for cobalt-free spinel LNMO and other high-voltage cathodes.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Cobalt-free spinel LiNi0.5Mn1.5O4 (LNMO) offers high energy density but suffers from poor cycling stability due to manganese dissolution, electrolyte decomposition, and lithium dendrite growth.
- High-voltage operation exacerbates these issues, limiting the practical application of advanced lithium-ion battery chemistries.
Purpose of the Study:
- To enhance the cycling stability and rate performance of LNMO cathodes and other high-voltage positive electrodes.
- To investigate the use of ferrocene hexafluorophosphate as an electrolyte additive for stabilizing electrode interfaces.
- To achieve high-energy-density lithium-ion batteries through improved electrode and electrolyte stability.
Main Methods:
- Utilizing ferrocene hexafluorophosphate as an electrolyte additive in Li||LNMO and other high-voltage battery systems.
- Analyzing the dynamic doping of Fe3+ into LNMO positive electrodes during cycling.
- Characterizing the formation of protective electrode-electrolyte interphases (SEI and CEI) using electrochemical and material analysis techniques.
Main Results:
- Ferrocene hexafluorophosphate additive successfully doped LNMO with Fe3+, enhancing cycling stability.
- Formation of thin, dense inorganic positive electrode electrolyte interphase (CEI) and F, P-rich solid electrolyte interphase (SEI) effectively stabilized electrode interfaces.
- Li||LNMO batteries demonstrated improved cycling stability and rate performance up to a 4.9V charge cutoff, with pouch cells maintaining performance over 160 cycles.
- The additive proved effective for various high-voltage cathodes (LNMO, NCM, LCO), enabling a 470 Wh/kg Li metal pouch cell.
Conclusions:
- Ferrocene hexafluorophosphate is a versatile electrolyte additive for stabilizing high-voltage lithium-ion battery electrodes.
- The dynamic doping and interphase formation mechanisms significantly improve battery cycle life and performance.
- This approach paves the way for realizing high-energy-density and stable lithium-ion batteries for practical applications.
