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一种内在的聚合物电解质通过现场交叉连接,用于具有高性能的固体基电池

Chen Li¹, Ajuan Hu¹, Xinan Zhang¹

¹Collaborative Innovation Centre of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, No. 422, Siming South Road, Xiamen, Fujian 361005, China.

|September 7, 2023

概括

一种新的交联聚合物电解质为固态电池提供高离子导电性和离子传输,克服了传统聚乙烯氧化物电解质的局限性.

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
聚合物化学聚合物化学

背景情况:

基于聚乙烯氧化物 (PEO) 的聚合物电解质由于在低室温下离子导电性而具有有限的商业应用.
许多报告的聚合物电解质是复合系统,而不是真正的固体电解质.
需要固有聚合物电解质,以提高基电池的性能.

研究的目的:

设计和合成一种具有三维 (3D) 网状结构的新型交联聚合物电解质.
与PEO相比,增强盐溶解和Li+离子导电性.
改进Li+转移数,并证明与金属和LiFePO4阴极的兼容性.

主要方法:

一种具有3D网状结构和富含氧气的细分体的交联聚合物的合成.
二三甲基硫胺 (LiTFSI) 盐的溶解以形成固有聚合物电解质 (IPE).
电化学特征包括离子导电性,Li+转移数和Li//Li对称和Li/IPE/LiFePO4电池中的循环稳定性.

主要成果:

合成的IPE在室温下具有0.49mS cm-1的离子导电性.
由于阻碍了离子迁移,达到了高达0.85的Li+转移数 (tLi+).
在Li//Li对称电池 (>2000个循环) 和Li/IPE/LiFePO4电池 (>300个循环后90%的容量保留) 中表现出极好的循环稳定性.

结论:

新的3D交联聚合物电解质显示出商业化全固态电池的巨大潜力.
IPE克服了基于PEO的电解质的局限性,提供高离子导电性和稳定性.
这种固有的聚合物电解质代表了固态电池技术的务实进步.

关键词:

交联聚合物聚合物的交联聚合物.盐分离的解离方式聚合物电解质的聚合物电解质.固体溶剂是一种固体溶剂.

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