Chemically anchored liquid-PEO based block copolymer electrolytes for solid-state lithium-ion batteries
Chemically anchored liquid-PEO based block copolymer electrolytes for solid-state lithium-ion batteries
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DOI：
10.1039/c4ta02327g
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发表时间：
2014-07
影响因子：
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通讯作者：
J. Rolland;Jérémy Brassinne;J. Bourgeois;Elio Poggi;A. Vlad;J. Gohy
中科院分区：
文献类型：
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作者：
J. Rolland;Jérémy Brassinne;J. Bourgeois;Elio Poggi;A. Vlad;J. Gohy
固态电解液被认为是开发更安全的全固态锂离子电池的关键要素。虽然聚氧乙烷(PEO)固态聚合物电解质支持Li+助熔剂，但只有在PEO微晶的熔点(>；65°C)以上才能达到令人满意的导电率，这使得PEO不切实际。在这里，我们通过嵌段共聚工程的方法，设计了一种机械夹持式液体-PEO电解质，它结合了低分子质量PEO的高离子导电性，同时保持了固体材料的尺寸完整性。在不影响机械性能的情况下，在室温下获得了约0.01ms cm−1的吸引离子电导率。该电解液具有较宽的电化学稳定窗口，有助于与锂金属建立稳定的界面。当将开发的材料集成到操作/功能原型电池中时，可以获得具有竞争力的性能，突出了所提供的潜力。
Solid-state electrolytes are being considered the keystone element for the development of safer all-solid-state lithium-ion batteries. While poly(ethylene oxide) (PEO) solid-state polymer electrolytes are known to support a Li+ flux, satisfying conductivities are reached only above the melting point of the PEO crystallites (>65 °C) rendering PEO unpractical. Herein, by means of block-copolymer engineering, we design a mechanically clamped liquid-PEO electrolyte that combines the high ionic conductivity of a low molecular mass PEO while retaining the dimensional integrity of a solid material. Attractive ionic conductivities of about 0.01 mS cm−1 are attained at room temperature without compromising mechanical properties. The electrolyte shows a wide electrochemical stability window and help in building a stable interface with lithium metal. Competitive performances are attained when integrating the developed materials into operational/functional prototype batteries highlighting the provided potential.