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Simultaneous Interphase Optimizations on the Large-Area Anode and Cathode of High-Energy-Density Lithium-Ion Pouch
Xu-Feng Zang1, Zhendong Li2, Yishan Fang3
1College of Science, Huzhou University, Huzhou, Zhejiang 313000, China.
ACS Applied Materials & Interfaces
|September 21, 2020
Summary
A new electrolyte additive strategy enhances lithium-ion battery performance by optimizing solid electrolyte interphase layers. This improves energy density, cycling stability, and performance across wide temperature ranges for commercial applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Commercial lithium-ion batteries require high energy density, wide operating temperatures, and long-term cycling stability.
- Achieving these requirements simultaneously presents significant challenges for current battery technologies.
Purpose of the Study:
- To develop a multiple additives strategy for simultaneously optimizing anode and cathode solid electrolyte interphase layers.
- To enhance the performance of artificial graphite (AGr)/LiNi0.5Co0.2Mn0.3O2 (NCM523) pouch cells.
Main Methods:
- A 2 Ah AGr/NCM523 pouch cell was fabricated using a novel mixture of electrolyte additives.
- The strategy focused on forming optimized surface layers on both the anode and cathode.
Main Results:
- The additive strategy resulted in a highly sulfurized anode layer and a uniform, thin cathode passivation layer.
- The modified pouch cells demonstrated high storage stability at 60 °C and improved low-temperature discharge capacity (-10 to -20 °C).
- Stable cycling performance was achieved with 85.5% capacity retention after 500 cycles, outperforming unmodified cells.
Conclusions:
- Simultaneous optimization of anode and cathode interphase layers is critical for constructing stable, high-energy-density lithium-ion pouch cells.
- The developed additive strategy effectively addresses key challenges in lithium-ion battery performance, paving the way for advanced energy storage solutions.
