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PEO-LITFSI-SiO2-SN System Promotes the Application of Polymer Electrolytes in All-Solid-State Lithium-ion Batteries.
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-06-12 , DOI: 10.1002/open.202000107 Wang Lyu 1 , Guoqiang He 1, 2 , Ting Liu 2
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-06-12 , DOI: 10.1002/open.202000107 Wang Lyu 1 , Guoqiang He 1, 2 , Ting Liu 2
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All‐solid‐state polymer lithium‐ion batteries are ideal choice for the next generation of rechargeable lithium‐ion batteries due to their high energy, safety and flexibility. Among all polymer electrolytes, PEO‐based polymer electrolytes have attracted extensive attention because they can dissolve various lithium salts. However, the ionic conductivity of pure PEO‐based polymer electrolytes is limited due to high crystallinity and poor segment motion. An inorganic filler SiO2 nanospheres and a plasticizer Succinonitrile (SN) are introduced into the PEO matrix to improve the crystallization of PEO, promote the formation of amorphous region, and thus improve the movement of PEO chain segment. Herein, a PEO18−LiTFSI−5 %SiO2−5 %SN composite solid polymer electrolyte (CSPE) was prepared by solution‐casting. The high ionic conductivity of the electrolyte was demonstrated at 60 °C up to 3.3×10−4 S cm−1. Meanwhile, the electrochemical performance of LiFePO4/CSPE/Li all‐solid‐state battery was tested, with discharge capacity of 157.5 mAh g−1 at 0.5 C, and capacity retention rate of 99 % after 100 cycles at 60 °C. This system provides a feasible strategy for the development of efficient all‐solid‐state lithium‐ion batteries.
中文翻译：
PEO-LITFSI-SiO2-SN体系促进聚合物电解质在全固态锂离子电池中的应用。
全固态聚合物锂离子电池因其高能量、安全性和灵活性而成为下一代可充电锂离子电池的理想选择。在所有聚合物电解质中，PEO基聚合物电解质因其可以溶解各种锂盐而受到广泛关注。然而，由于高结晶度和较差的链段运动，纯PEO基聚合物电解质的离子电导率受到限制。在PEO基体中引入无机填料SiO 2纳米球和增塑剂丁二腈(SN)，提高PEO的结晶度，促进非晶区的形成，从而改善PEO链段的运动。本文通过溶液流延法制备了 PEO 18 -LiTFSI-5 %SiO 2 -5 %SN 复合固体聚合物电解质（CSPE）。该电解质在60℃下表现出高达3.3×10 -4 S cm -1的高离子电导率。同时测试了LiFePO 4 /CSPE/Li全固态电池的电化学性能，0.5 C放电容量为157.5 mAh g -1 ，60 ℃循环100次后容量保持率为99%。该系统为高效全固态锂离子电池的开发提供了可行的策略。
更新日期：2020-06-12
中文翻译：
PEO-LITFSI-SiO2-SN体系促进聚合物电解质在全固态锂离子电池中的应用。
全固态聚合物锂离子电池因其高能量、安全性和灵活性而成为下一代可充电锂离子电池的理想选择。在所有聚合物电解质中，PEO基聚合物电解质因其可以溶解各种锂盐而受到广泛关注。然而，由于高结晶度和较差的链段运动，纯PEO基聚合物电解质的离子电导率受到限制。在PEO基体中引入无机填料SiO 2纳米球和增塑剂丁二腈(SN)，提高PEO的结晶度，促进非晶区的形成，从而改善PEO链段的运动。本文通过溶液流延法制备了 PEO 18 -LiTFSI-5 %SiO 2 -5 %SN 复合固体聚合物电解质（CSPE）。该电解质在60℃下表现出高达3.3×10 -4 S cm -1的高离子电导率。同时测试了LiFePO 4 /CSPE/Li全固态电池的电化学性能，0.5 C放电容量为157.5 mAh g -1 ，60 ℃循环100次后容量保持率为99%。该系统为高效全固态锂离子电池的开发提供了可行的策略。
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