Abstract

Polymer electrolytes have attracted widespread attention owing to their low cost and excellent processability. However, polymer electrolytes have yet been widely applied in commercial batteries due to their own drawbacks, such as weak mechanical properties and lower ionic conductivity. In this paper, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) was blended with polyethylene oxide (PEO) and polymethyl methacrylate (PMMA) to build a novel polymer matrix, and SiO₂@PMMA was doped into blended polymer matrix to form a composite polymer electrolyte named CPE-(SiO₂@PMMA). The CPE-(SiO₂@PMMA) performs superior electrochemical performance, such as a favorable electrochemical stability window (4.7 V vs Li/Li⁺), decent ionic conductivity (8.54 × 10^–5 S cm⁻¹ at 60 ℃), and excellent interface stability. The lithium metal battery LiNi_0.8Co_0.1Mn_0.1O₂/CPE/Li was fabricated to build a high specific energy system, which performs excellent cycling and C-rate performance compared to others polymer electrolytes. Capacity retention of LiNi_0.8Co_0.1Mn_0.1O₂/Li cell with CPE-(SiO₂@PMMA) achieves 81.6% after 100 cycles, while CPE was broken with 100 cycles unfinished. All of the above favorable properties proved that PVDF-HFP/PMMA/PEO polymer matrix with SiO₂@PMMA doped is a promising electrolyte candidate for flexible lithium metal batteries.

中文翻译：

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锂金属电池用纳米SiO 2 @PMMA掺杂的复合聚合物PVDF-HFP / PMMA / PEO电解质

摘要

聚合物电解质由于其低成本和优异的可加工性而引起了广泛的关注。然而，由于聚合物电解质自身的缺点，例如弱的机械性能和较低的离子电导率，它们已经广泛地应用于商业电池。本文将聚偏二氟乙烯-共-六氟丙烯（PVDF-HFP）与聚环氧乙烷（PEO）和聚甲基丙烯酸甲酯（PMMA）共混，构建了新型聚合物基体，并将SiO ₂ @PMMA掺入共混聚合物基体中形成名为CPE-（SiO ₂ @PMMA）的复合聚合物电解质。CPE-（SiO ₂ @PMMA）具有出色的电化学性能，例如良好的电化学稳定性窗口（4.7 V vs Li / Li ⁺），适度的离子电导率（60℃时为8.54×10 ^–5  S cm ^-1）和出色的界面稳定性。制造锂金属电池LiNi _0.8 Co _0.1 Mn _0.1 O ₂ / CPE / Li可以构建高比能系统，与其他聚合物电解质相比，该系统具有出色的循环和C速率性能。100次循环后，具有CPE-（SiO ₂ @PMMA）的LiNi _0.8 Co _0.1 Mn _0.1 O ₂ / Li电池的容量保持率达到81.6％，而未完成100次循环则破坏了CPE。以上所有有利性能证明了具有SiO _2的PVDF-HFP / PMMA / PEO聚合物基体掺杂PMMA是有希望的用于柔性锂金属电池的电解质。