제출 정보
이상원 (POSTECH)
박수진 (포항공과대학교)
초록
Li metal anodes have high theoretical capacity (3860 mAh g-1) but suffer from dendrites and volume instability. This study reports a one-step, scalable fabrication of 3D hosts using nonsolvent-induced phase separation (NIPS). These low-tortuosity (LT) hosts integrate vertically aligned channels for fast ion transport with a silver-gradient interface for bottom-up Li deposition.
This architecture suppresses dendrites and limits swelling to 4.4%. Finite element simulations confirm that structural alignment mitigates ion depletion while chemical gradients guide uniform deposition. The LT host sustains >5500 h at 1C in symmetric cells and shows superior durability in full cells (4 mAh cm-2) with LFP and high-loading NCM811 cathodes. Pouch cells (N/P=0.8, E/C=2.5 g Ah-1) achieve 398.1 Wh kg-1 and 1516.8 Wh L-1, retaining 94.2% capacity after 80 cycles. This strategy offers a practical route toward high-energy-density Li metal batteries.
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