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Published on: November 10, 2014
Interphase Engineering for Stabilizing Ni-Rich Cathode in Lithium-Ion Batteries by a Nucleophilic Reaction-Based
Wei-Chen Zheng1, Zheng Huang1, Chen-Guang Shi1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, P. R. China.
Researchers improved lithium-ion battery performance using lithium isopropoxide (LIP) as an additive. This enhances the cathode-electrolyte interphase (CEI) for long-term cycling stability in nickel-rich NCM83 batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Nickel-rich cathode materials offer high energy density for next-generation lithium-ion batteries.
- Interphase failure on Ni-rich cathodes limits cycling performance and long-term applications.
Purpose of the Study:
- To enhance the interphase properties of Ni-rich cathodes for improved cycling stability.
- To investigate the use of lithium isopropoxide (LIP) as an additive to stabilize the cathode-electrolyte interphase (CEI).
Main Methods:
- Introduction of lithium isopropoxide (LIP) as a nucleophilic additive into commercial electrolytes.
- Electrochemical cycling of Li||LiNi0.83Co0.11Mn0.06O2 (NCM83) cells.
- Analysis of the cathode-electrolyte interphase (CEI) formation and stability.
Main Results:
- Li||NCM83 cells demonstrated remarkable cycling stability, retaining 83.3% capacity after 500 cycles.
- A robust CEI was constructed on the NCM83 surface via LIP-induced ring-opening polymerization of ethylene carbonate (EC).
- The CEI effectively suppressed gas evolution, phase transformation, and microcrack formation, maintaining Ni valence and coordination.
Conclusions:
- Lithium isopropoxide (LIP) is an effective additive for improving the long-term cycling stability of Ni-rich cathodes.
- The LIP-induced CEI enhances battery performance by stabilizing the cathode-electrolyte interface.
- This strategy offers a promising pathway for developing high-performance lithium-ion batteries.
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