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Constructing Nano-Interlayer Inhibiting Interfacial Degradation toward High-Voltage PEO-Based All-Solid-State Lithium
Pengfei Zhai1, Shuangquan Qu2, Niaz Ahmad1,3
1Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 7, 2024
Summary
This study addresses interfacial instability in solid-state polymer lithium metal batteries by coating high-voltage cathodes with a LiNb0.6Ti0.5O3 (LNTO) layer. This LNTO coating effectively mitigates side reactions and enhances battery longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Interfacial instability between solid polymer electrolytes (SPEs) and high-voltage cathodes limits all-solid-state polymer lithium metal battery (ASSPLB) performance.
- Gas generation from side reactions at the cathode-SPE interface causes contact loss, further degrading ASSPLBs.
Purpose of the Study:
- To investigate the role of interfacial side reactions and gas generation in ASSPLB degradation.
- To develop a protective coating for high-voltage cathodes to enhance ASSPLB stability and longevity.
Main Methods:
- Coating LiNi0.83Co0.07Mn0.1O2 (NCM83) cathodes with LiNb0.6Ti0.5O3 (LNTO) to create a modified cathode (CNCM83).
- Analyzing the impact of the LNTO coating on interfacial side reactions, SPE decomposition, cathode stability, and interfacial resistance.
- Evaluating the electrochemical performance and cycling stability of ASSPLBs utilizing the modified cathode.
Main Results:
- The LNTO coating effectively reduces SPE decomposition and prevents detrimental phase transitions and cracks in the NCM83 cathode.
- Gas generation and void formation at the cathode-SPE interface are significantly mitigated by the LNTO layer.
- The interfacial resistance growth rate decreased from 37.6 Ω h-0.5 to 2.4 Ω h-0.5 for the modified cathode.
- ASSPLBs with the CNCM83 cathode demonstrated excellent cyclability, retaining 75% capacity after 300 cycles at 4.2 V.
Conclusions:
- Coating high-voltage cathodes with LNTO is a promising strategy to suppress interfacial side reactions and gas generation in PEO-based ASSPLBs.
- The LNTO layer enhances the stability of the cathode-electrolyte interface, leading to improved battery longevity and high-voltage performance.
- This approach offers a viable solution for developing durable and high-energy-density all-solid-state polymer lithium metal batteries.
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