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Construction and Testing of Coin Cells of Lithium Ion Batteries
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Aqueous Binder Enhanced High-Performance GeP5 Anode for Lithium-Ion Batteries
Jun He1,2, Yaqing Wei1,2, Lintong Hu1
1State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.
Frontiers in Chemistry
|February 28, 2018
Summary
Lithium polyacrylate (LiPAA) aqueous binder significantly enhances germanium phosphide (GeP5) anode performance in lithium-ion batteries (LIBs), improving capacity, cycle stability, and rate capability compared to other binders.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Germanium phosphide (GeP5) shows promise as a high-capacity anode material for lithium-ion batteries (LIBs).
- GeP5's large volume change during cycling necessitates a robust binder for electrode stability.
- Aqueous binders are desirable for sustainable battery manufacturing.
Purpose of the Study:
- To evaluate the performance of aqueous binders, lithium polyacrylate (LiPAA) and sodium carboxymethyl cellulose (NaCMC), for GeP5 anodes.
- To compare the electrochemical performance of LiPAA and NaCMC binders against the traditional polyvinylidene fluoride (PVDF) binder.
- To understand the structure-property relationships governing binder effectiveness.
Main Methods:
- Electrochemical testing of GeP5 anodes with LiPAA, NaCMC, and PVDF binders in LIBs.
- Assessment of initial Coulombic efficiency, reversible capacity, cyclability, and rate capability.
- Analysis of binder interactions with GeP5 and copper current collectors.
Main Results:
- GeP5 demonstrates stability in aqueous and alcoholic solvents, suitable for aqueous binders.
- LiPAA binder significantly improved initial Coulombic efficiency, reversible capacity, and cycling stability of GeP5 anodes.
- LiPAA-based electrodes exhibited superior rate capability, even at low temperatures, compared to NaCMC and PVDF.
Conclusions:
- Aqueous binders, particularly LiPAA, are effective for stabilizing GeP5 anodes in LIBs.
- The unique polymer structure and carboxyl groups of LiPAA contribute to enhanced electrode integrity and electrochemical performance.
- LiPAA offers a promising alternative to traditional binders for high-performance GeP5 anodes.
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