通过使用有效的机器学习原子间潜力,使离子电池中固体电解质介相材料的准确建模成为可能
Wen-Qing Li1, Gang Wu1, Juan Manuel Arce-Ramos1
1Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore. ngmf@a-star.edu.sg.
Materials horizons
|September 12, 2025
概括
机器学习的原子间潜力 (MLIP) 改善了离子电池中固体电解质介相 (SEI) 材料的原子模拟. 这种方法可以准确地建模SEI属性,克服传统方法的局限性.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 电池技术 电池技术
背景情况:
- 在离子电池中,精确建模固体电解质间相 (SEI) 是至关重要的,但由于其复杂的结构,具有挑战性.
- 传统的原子模拟需要精确的原子间潜力,这些潜力对于混合材料SEI系统来说很难评估.
研究的目的:
- 为了证明机器学习原子间潜能 (MLIPs) 的有效性,用于模拟SEI的结构和动态特性.
- 为SEI分析开发可扩展的计算工作流程,克服传统密度函数理论 (DFT) 方法的局限性.
主要方法:
- 在无形结构和密度函数理论 (DFT) 计算上训练的利用时刻张量潜力 (MTP).
- 采用积极的学习循环来有效地采样分子动力学 (MD) 轨迹.
- 经过验证的MLIP模型与SEI相关材料如Li2CO3和Li2EDC的实验和理论数据对比.
主要成果:
- 经过训练的MTP模型准确地预测了SEI材料的结构性质 (格子参数,弹性常数,声子光谱).
- 动态特性和能量障碍被准确地捕获,显示有限的温度效应.
- 在Li2CO3中确定了主要的扩散机制 (空位,间位,Frenkel对),与DFT一致.
- 证明MLIP培训数据集可以提高图形神经网络 (GNN) 的潜力.
结论:
- 开发了一个可扩展的机器学习工作流程用于SEI建模,使更大的时间和长度尺度模拟成为可能.
- MLIP方法为了解离子电池中的SEI行为提供了一种可靠和有效的方法.
- 这项工作促进了先进的电池材料设计和性能优化.
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