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Polydopamine Coating on Electrodes for Interphase Engineering in Lithium-Ion Batteries
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DOI：10.1002/bte2.70140.png)
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Abstract
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Here, polydopamine (PDA) coating on the surface of the LiCoO2 cathode and graphite anode enhances both rate capability and cyclability of the cell. PDA serves as an artificial solid electrolyte interphase (ASEI), preventing direct contact between the electrolyte and the anode while providing an ion-conducting path for Li+ ions. As a result, at current density of 10 mA g−1, LiCoO2ǀǀPDA-coated Graphite and LiCoO2ǀǀGraphite mixed with PDA full cells showed discharge capacity up to 168 and 198 mAh g−1, respectively. Initial Coulombic efficiency (ICE) of the cells is obtained 98.3% and 99.1%, respectively, due to the suppression of interfacial side reactions between the electrode and electrolyte. Also, PDA serves as an artificial cathode electrolyte interphase (ACEI) on the cathode, mitigating direct contact between the electrolyte and the active material while providing an ion-conducting pathway for Li+ ions. As a result, at current density of 10 mA g−1, the PDA-coated LiCoO2ǀǀGraphite full cell exhibited initial discharge capacity of 168 mAh g−1, which decreases to 136 mAh g−1 after 100 cycles, retaining approximately 68% of its initial capacity. More notably, the LiCoO2 mixed with PDAǀǀGraphite full cell showed high initial discharge capacity of 187 mAh g−1, maintaining 142 mAh g−1 after 100 cycles, corresponding to capacity retention of approximately 82%. PDA enhances Li+ diffusion by increasing the diffusion coefficient up to 1.6 × 10−7 cm2 s−1. This investigation provides new insights into improving the cyclability of PDA-based cathodes and anodes in lithium-ion batteries.
Keywords:
artificial cathode electrolyte interphase (ACEI)
artificial solid electrolyte interphase (ASEI)
lithium-ion batteries
polydopamine (PDA)
surface coating
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