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南京理工大学傅佳骏、陈涛AM:解耦化学-力学退化以实现可规模化硅基固态电池

  • 2026-05-28 17:47:16
南京理工大学傅佳骏、陈涛AM:解耦化学-力学退化以实现可规模化硅基固态电池

 

为实现能源系统脱碳,亟需突破传统锂离子电池的能量密度与安全瓶颈,硅基固态电池结合了硅负极4200 mAh/g的超高理论比容量与固态结构的本征安全性,成为下一代关键储质的界面稳定策略,包括原位聚合构建粘弹性缓冲层、无机固态电解质的表面润湿性与钝化调控、机械增强型聚合物复合设计,以协调离子电导率与力学顺应性,通过集成材料设计与多尺度建模阐明机械应力与电化学稳定性的耦合关系,并探讨规模化制备的关键工程考量,弥合实验室研究与实用化硅基固态电池的差距。

该成果以“Decoupling Chemo‐Mechanical Degradation for Scalable Silicon‐Based Solid‐State Batteries”为题发表在“Advanced Materials”期刊,第一作者是Su Yujing。

【工作要点】

1. 研究首先明确硅基固态电池的核心挑战为硅负极与固态电解质界面的化学-力学耦合退化,通过定量指标区分化学降解(SEI生长速率常数、分解产物含量)与机械退化(堆叠压力变化、裂纹体积分数、孔隙厚度),证实机械失效占总阻抗增加的73%,化学分解占27%,硫化物电解质与硅界面易生成厚且含微裂纹的反应层,阻碍锂离子侧向扩散。

2. 接着针对凝胶聚合物、氧化物、硫化物、聚合物、复合电解质展开多尺度设计,凝胶电解质通过原位聚合实现电极纳米级共形浸润,粘弹性松弛缓冲体积膨胀;氧化物电解质需界面修饰解决刚性接触问题;硫化物电解质依赖人工钝化层与压力调控抑制副反应;聚合物电解质通过动态交联与复合填料平衡力学与导电性能;复合电解质整合无机填料的高导电性与聚合物的柔韧性,实现化学-力学解耦。

3. 然后采用多尺度表征与多物理场模拟解析失效机制,低温透射电镜、原位X射线断层扫描、飞行时间二次离子质谱等技术实现原子到宏观尺度的界面演化观测,相场模型与有限元分析定量预测应力分布与裂纹扩展,明确颗粒尺寸、堆叠压力、界面结构对电池性能的影响规律。

4. 最后指出规模化应用的核心瓶颈为实验室与工业指标差距、堆叠压力管理、预锂化技术、制备工艺兼容性,提出自适应界面设计、结构解耦化学-力学、低压运行、实验室到中试转化的优化方向,为高能量密度商用硅基固态电池开发提供指导。

图1概述了硅基固态电池面临的挑战、界面稳定型固态电解质的多尺度设计策略,以及用于解析界面动态演化的先进表征技术,涵盖原子、介观、宏观不同尺度的分析手段。

图2展示了硫化物电解质体系中硅负极的化学-力学耦合失效机制,包括硫化物电解质的热力学不稳定性、界面相生长阻碍离子传输、孔隙形成与颗粒孤立导致界面失效三方面过程。

图3定量呈现全固态电池中硅负极临界断裂直径随施加堆叠压力的变化关系,外部压力可抵消嵌拉应力,提升硅颗粒临界断裂尺寸,而商用软包电池典型堆叠压力限制了实际安全操作窗口。

图4为原位聚合与凝胶化策略稳定硅基负极的示意图,包含原位凝胶化电解质-粘结剂体系、准固态凝胶电解质固化过程、DOL开环聚合反应、自修复聚合物聚合过程、液态与聚合物电解质中硅负极循环结构对比。

图18是硅基固态电池化学-力学应力演化与压力调控策略示意图,包括合金负极复合全电池电化学循环与原位应力测试、电池组装结构、锂硅合金与固态电解质塑性变形、锂离子浓度与应力模拟分布、自加压硅碳负极结构设计。

图19为固态电池硅负极预锂化策略示意图,涵盖无电解质硅负极原位预锂化、辊压法薄膜合金负极预锂化、微米硅负极嵌锂活化行为与 percolation 机制。

【结论】

本文系统探究了固态电池中硅负极的多尺度化学-力学失效机制及对应电解质设计策略,剖析了硅体积变化引发机械断裂、接触损失与寄生副反应的退化闭环,对比了凝胶、无机、复合电解质体系缓解界面应力的作用,明确了多尺度表征在揭示固态界面动态演化中的关键价值。材料与界面设计层面,各电解质体系与硅的兼容性存在固有权衡,氧化物需润湿剂维持接触,硫化物需钝化层抑制还原,聚合物与复合体系需发挥粘弹性应力耗散能力,需发展多级化学键合的无机-有机界面实现离子传导、力学缓冲与化学钝化协同。机理层面,失效具有原子到宏观的多尺度特征,先进表征与多物理场相场建模可区分动力学与热力学限制,推动理性设计。实验室到商用化仍需攻克工程瓶颈,未来需发展自适应界面体系、结构解耦化学-力学、建立低压运行标准、推进规模化制备与预锂化技术,通过多方位创新,硅基固态电池有望从实验室概念转化为高能量密度的商用储能技术。

链接:https://doi.org/10.1002/adma.73413

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内容来源:科学电池网

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  1. CONNECT:[ UseTime:0.000415s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000570s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000254s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000406s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000536s ]
  6. SELECT * FROM `set` [ RunTime:0.000213s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000535s ]
  8. SELECT * FROM `article` WHERE `id` = 571463 LIMIT 1 [ RunTime:0.001610s ]
  9. UPDATE `article` SET `lasttime` = 1780247415 WHERE `id` = 571463 [ RunTime:0.000820s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000434s ]
  11. SELECT * FROM `article` WHERE `id` < 571463 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000547s ]
  12. SELECT * FROM `article` WHERE `id` > 571463 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000482s ]
  13. SELECT * FROM `article` WHERE `id` < 571463 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001452s ]
  14. SELECT * FROM `article` WHERE `id` < 571463 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001330s ]
  15. SELECT * FROM `article` WHERE `id` < 571463 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001427s ]
0.085260s