Advanced PVDF-HFP-based composite quasi-solid polymer electrolyte for high-energy lithium-ion batteries with enhanced safety and durability

被引:2
作者
Kim, Su-Hyun [1 ]
Woo, Min-Hong [1 ]
Omkar, Sangabathula [2 ]
Javid, Asif [2 ]
Chang, Duck-Rye [1 ]
Park, Chan-Jin [2 ]
机构
[1] Korea Inst Ind Technol, 208-6 Cheomdangwagi Ro, Gwangju 61012, South Korea
[2] Chonnam Natl Univ, Dept Mat Sci & Engn, 77 Yongbong Ro, Gwangju 61186, South Korea
基金
新加坡国家研究基金会;
关键词
Lithium-ion batteries; Energy density; Ionic conductivity; Composite quasi-solid electrolyte; Dendrite inhibition; Areal capacity; CONDUCTIVITY; LIQUID;
D O I
10.1016/j.jpowsour.2025.236716
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The development of high-energy lithium-ion batteries (LIBs) with enhanced safety and durability requires overcoming challenges related to electrolyte instability, low ionic conductivity, and inadequate mechanical strength. This study introduces a composite quasi-solid polymer electrolyte (CQSPE) based on PVDF-HFP, optimized with Al2O3 nanoparticles to enhance fire retardancy, mechanical strength, ionic conductivity, and interfacial stability. The CQSPE containing 15 wt% Al2O3 exhibits a high ionic conductivity of 6.5 mS cm-1 at 60 degrees C and a tensile strength of 1.56 MPa, effectively suppressing dendrite formation during cycling. The influence of CQSPE thickness (30, 60, and 90 mu m) on electrochemical performance is systematically analyzed. The 60 mu m membrane demonstrates optimal performance, with superior plasticizer retention and balanced mechanical properties. In a full-cell configuration (Gr-SiOx|CQSPE|NCM622), the 60 mu m electrolyte delivers a reversible areal capacity of 2.61 mAh cm-2 with 72.96 % capacity retention after 300 cycles at 0.5C. Additionally, a double-layered pouch cell with this optimized CQSPE exhibits an initial discharge capacity of 1 Ah (2.76 mAh cm-2) and 79.6 % capacity retention over 350 cycles at 0.5C/1C. The facile structural design of CQSPE provides a promising pathway for the development of high-performance solid-state lithium-ion batteries in the near future.
引用
收藏
页数:13
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