符毓 (2025-06-30 20:19):
#paper doi:10.1038/s41467-025-59363-4 Nature Communications, 2025, Robust interface and reduced operation pressure enabled by co-rolling dry-process for stable all-solid-state batteries. 干法工艺无需使用溶剂,是一种可持续且前景广阔的全固态电池制造方法。然而,薄而坚固的固态电解质(SSE)层的实用制造设计尚未确立。本文用了一种干法工艺方法,它能增强固态电解质层从薄膜制造到电池运行的机械稳定性。 1. 通过厚的复合正极与电解质共压方法,制成薄的固态电解质与正极的复合结构,对比单独制成的固态电解质和复合正极膜 2. 这种方法制成的固态复合材料在共轧制过程中,可形成坚固的 SSE 正电极界面,有助于电池组装过程,降低机械故障风险与传统方法相比 3. 这种坚固的界面不易形成空隙,可显著提高 ASSB 在低堆叠压力(2MPa)下的循环能力(500 次循环后容量保持率大于 80%) 4. 通过将 ASSB 与法硅负极结合制作的ASSB 袋式电池,比能量可以达到为310Wh kg-1
Robust interface and reduced operation pressure enabled by co-rolling dry-process for stable all-solid-state batteries
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Abstract:
Abstract The dry-process is a sustainable and promising fabrication method for all-solid-state batteries by eliminating solvents. However, a pragmatic fabrication design for thin and robust solid-state electrolyte (SSE) layers has not been established. Herein, we report a dry-process approach that enhances mechanical stability of SSE layers from film fabrication to cell operation. By co-rolling thick SSE and positive electrode feeds, a uniform, thin SSE layer (50 µm) and a high loading positive electrode layer (5 mAh cm−2) with high active material ratio (80 wt%) are simultaneously achieved. This SSE-positive electrode integrated film exhibits enhanced physical properties and cyclability (> 80% retention after 500 cycles) at low stack pressure (2 MPa) compared to the freestanding counterparts, attributed to reinforced and intimate SSE-positive electrode interface constructed during co-rolling process. Additionally, an all-solid-state pouch cell with high stack-level specific energy (310 Wh kg−1) and energy density (805 Wh L−1) operating at 30 °C and 5 MPa is demonstrated.
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