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喜欢的无形Li_xSi工艺与受限制的体积变化,使长循环近固态SiO_x阳极成为可能

Ruoyang Wang¹, Yuqing Wu¹, Yifan Niu²

¹School of Chemical Engineering, Sichuan University, Chengdu, 610065, P. R. China.

|July 23, 2024

概括

这项研究引入了用于氧化 (SiOx) 阳极的新型凝聚合物电解质 (GPE),显著提高了电池循环稳定性. GPE减轻了阳极的体积变化,提高了长期性能,并使实际应用成为可能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

基于的阳极为电池提供高的特定容量,但在循环过程中会发生大量的体积变化,导致电极降解和有限的实际使用.
现有的策略,如结构修改和绑定器优化,部分解决了体积扩张问题,但不能完全解决这个问题.
稳定的电解质的开发对于克服下一代电池中阳极的局限性至关重要.

研究的目的:

开发一种凝聚合物电解质 (GPE),使用SiOx阳极材料的现场热聚合工艺.
调查GPE在化/脱过程中减轻与SiOx阳极相关的体积变化的能力.
为了实现基于GPE的SiOx电池电池的长期循环稳定性和更好的性能.

主要方法:

通过现场热聚合工艺制造GPE.
在电池电池中将GPE与SiOx阳极集成.
电化学测试,包括在特定电流密度下对循环性能进行评估.
整合了预化工艺,以提高初始库伦比克的效率和稳定性.

主要成果:

GPE有效地引导了化/脱化机制,有利于无形LixSi形成,最大限度地减少体积膨胀.
GPE-SiOx细胞在循环性能上显著改善,在450个循环后在500 mA g-1.1下保持693.80 mAh g-1.
加入前化进一步提高了稳定性和初始库伦比效率,电池在480个循环后保留了641.90 mAh g-1.

结论:

开发的GPE是SiOx阳极的有希望的电解质,有效地应对大体积变化的挑战.
GPE促进了独特的化机制,增强了电极完整性和循环稳定性.
这种方法代表了大容量基阳极在储能设备中的实际应用的重大进步.

关键词:

凝聚合物电解质的凝聚合物电解质.在现场的聚合.离子电池是离子电池的一种.在化前进行化.在SiOxanode中使用.

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