Single‐Ion Conducting Poly(Ethylene Oxide Carbonate) as Solid Polymer Electrolyte for Lithium Batteries,Batteries & Supercaps

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Single‐Ion Conducting Poly(Ethylene Oxide Carbonate) as Solid Polymer Electrolyte for Lithium Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-10-29 , DOI: 10.1002/batt.201900119
Leire Meabe ₁ , Nicolas Goujon ₂ , Chunmei Li ₃ , Michel Armand ₃ , Maria Forsyth _{2,

4} , David Mecerreyes _{1,

4}

Affiliation

Single‐ion conducting polymer electrolytes (SIPE) have attracted a lot of interest for application in high energy density lithium metal batteries. SIPEs possess lithium transport numbers close to unity, which does not provoke concentration gradients and holds the promise of limiting lithium dendrite formation. In this article, we have optimized a single‐ion polymer incorporating the most successful chemical units in polymer electrolytes, such as ethylene oxide, carbonate, and a lithium sulfonimide. This single‐ion poly(ethylene oxide carbonate) copolymer was synthesized by polycondensation between polyethylene glycol, dimethyl carbonate, and a functional diol including the pendant sulfonamide anionic group and the lithium counter‐cation. By playing with the monomer stoichiometry, the crystallinity and ionic conductivity were optimized. The best copolymer showed high ionic conductivity values of 1.2×10⁻⁴ S cm⁻¹ at 70 °C. Lithium interactions and mobility were studied by lithium‐pulsed field gradient, lithium diffusion, NMR relaxation time measurements, and FTIR‐ATR analysis. High lithium mobility is observed, which is due to the weakly coordinating chemical environment in the polymer and also that the sulfonamide in the SIPE adopts to a greater extent the cis conformation, which is known to promote lithium mobility. Finally, the performance of the singe‐ion conducting poly(ethylene oxide carbonate) was compared in lithium symmetric cells versus an analogous conventional salt in polymer electrolyte, showing improved performance in lithium plating and stripping.

中文翻译：

单离子导电聚环氧乙烷碳酸酯作为锂电池的固体聚合物电解质

单离子导电聚合物电解质（SIPE）在高能量密度锂金属电池中的应用吸引了很多兴趣。SIPE的锂传输数接近于1，不会引起浓度梯度，并且有望限制锂枝晶的形成。在本文中，我们优化了单离子聚合物，在聚合物电解质中结合了最成功的化学单元，例如环氧乙烷，碳酸盐和磺酰亚胺锂。这种单离子型聚碳酸亚乙酯共聚物是通过聚乙二醇，碳酸二甲酯和包括侧链磺酰胺阴离子基团和锂抗衡阳离子的功能性二醇之间的缩聚反应合成的。通过发挥单体化学计量关系，可以优化结晶度和离子电导率。在70°C下为^-4 S cm ^-1。通过锂脉冲场梯度，锂扩散，NMR弛豫时间测量和FTIR-ATR分析研究了锂相互作用和迁移率。观察到高的锂迁移率，这是由于聚合物中的配位化学环境较弱，并且还因为SIPE中的磺酰胺在更大程度上采用了顺式构象，这已知会促进锂的迁移率。最后，对比了在锂对称电池中与单一离子导电的聚环氧乙烷碳酸酯与聚合物电解质中类似的传统盐的性能，显示了在电镀和剥离锂方面的改进性能。

更新日期：2019-10-29

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