3D hierarchical fireproof gel polymer electrolyte towards high-performance and comprehensive safety lithium-ion batteries

被引：65

作者：

Du, Yirou ^{[1
]}

Liu, Xianshuai ^{[1
]}

Chen, Lin ^{[1
]}

Yin, Sihao ^{[1
]}

Xie, Yuhui ^{[1
]}

Li, Ao ^{[2
]}

Liang, Xiaodong ^{[3
]}

Luo, Yong ^{[4
]}

Wu, Feng ^{[1
]}

Mei, Yi ^{[1
]}

Xie, Delong ^{[1
]}

机构：

[1] Kunming Univ Sci & Technol, Fac Chem Engn, Int Joint Lab Sustainable Polymers Yunnan Prov, Yunnan Prov Key Lab Energy Saving Phosphorus Chem, Kunming 650500, Peoples R China

[2] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China

[3] Tech Univ Denmark DTU, Ctr Energy Resources Engn, Dept Chem & Biochem Engn, Soltofts Plads Bldg 229, DK-2800 Lyngby, Denmark

[4] Huading Guolian HDGT Sichuan Power Battery Co LTD, Chengdu 610307, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 476卷

基金：

中国国家自然科学基金;

关键词：

Gel polymer electrolytes; Lithium -Ion batteries; Black phosphorus; P -N synergetic flame retardant; Cross-linking; Fireproof;

D O I：

10.1016/j.cej.2023.146605

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Gel polymer electrolyte (GPE) stands as an extensively investigated solid-state electrolytes for next-generation lithium-ion batteries (LIBs). Nonetheless, their inherent flammability necessitates the addition of flame retardants, which adversely impact LIBs' electrochemical performance. Herein, we propose a groundbreaking conceive of a fireproof cross-linking composite GPE that united phosphene and a P-N synergistic flame retardant (DPM), equipping a dual-enhanced conduction effect on Li+ ions and a cooperative P-N flame-retardant effect. By strategically manipulating the polymer segments hierarchy and incorporating efficient function groups from DPM, freely Li+ mobility has been propelled, thereby delivering satisfactory ionic conductivity (1.263 mS cm-1, 20 celcius), elevated oxidative stability (5.42 V vs. Li+/Li) and improved Li+ transference number (0.53). The composite GPE-based batteries (LFP||Li, NCM523||Li and LFP||Graphite) indicate acceptable specific capacities at 1 C, together with good reversible capacity retention rate and stable coulombic efficiency after 200 cycles. Noticeably, the pouch cells (LFP||Graphite) assembled with composite GPE demonstrate superior safety robustness and fire-resistance under mechanical mishandling and ignition situations. Finally, the elucidation of Li+ ions interaction mechanism with polymer matrix is unraveled through molecular orbital energy levels and density function theory (DFT) calculation. This study offers valuable insights for harnessing novel electrolyte materials in high-safety LIBs.

引用

页数：16

共 73 条

[21] Constructing 3D Li+-percolated transport network in composite polymer electrolytes for rechargeable quasi-solid-state lithium batteries [J].