首页|TPFPP@PMMA core-shell polymer modified flame retardant separator achieved by aqueous technique for high-voltage lithium metal batteries

TPFPP@PMMA core-shell polymer modified flame retardant separator achieved by aqueous technique for high-voltage lithium metal batteries

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  • NETL
  • NSTL
  • Elsevier
© 2024 Elsevier B.V.The safety of lithium metal batteries (LMBs) is a critical barrier to their further development towards achieving higher energy densities exceeding 400 Wh kg−1. Although the incorporation of flame-retardant additives into the liquid electrolyte can enhance the safety of LMBs, it often compromises electrochemical performance. To achieve a balance, a flame-retardant separator with thermally responsive properties has been developed by coating a core-shell flame-retardant polymer (poly(methyl methacrylate) (PMMA) as the shell and tris (pentafluorophenyl) phosphine (TPFPP) as the core) onto a polyethylene (PE) separator using an aqueous technique. Compared to the original PE separator, the TPFPP@PMMA flame-retardant separator exhibits superior mechanical strength and electrolyte wettability, along with significantly improved flame retardancy and thermal stability. Due to the excellent compatibility of PMMA polymer with lithium anode, a stable cycle life of over 500 hours for the Li||Li symmetrical coin cell has been achieved. The capacity retention of the Li||LiNi0.8Co0.1Mn0.1O2 battery is higher than that of the PE separator (80.0% vs. 65.8%) after 100 cycles between 3.0 V and 4.35 V, ascribed to the formation of a stable and robust cathode electrolyte interface (CEI) film, primarily composed of rich LiF and poor Li2CO3 on the cathode surface, induced by the PT/PE separator. Thus, the developed flame-retardant separator offers new prospects to the revival of high-energy-density LMBs.

Core-shell polymerFlame retardant separatorLithium metal batteryPoly(methyl methacrylate)Tris (pentafluorophenyl) phosphine

Chen D.、Hong M.、Wan J.、Li W.、Liao Y.

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School of Chemistry South China Normal University

School of Chemistry South China Normal University||National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs Engineering Research Center of MTEES (Ministry of Education) Research Center of BMET (Guangdong Province) Key Lab. of ETESPG(GHEI) South China Normal University

School of Chemistry South China Normal UniversitySchool of Chemistry South China Normal University||National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs Engineering Research Center of MTEES (Ministry of Education) Research Center of BMET (Guangdong Province) Key Lab. of ETESPG(GHEI) South China Normal University||

2025

10.1016/j.reactfunctpolym.2024.106130

Reactive & functional polymers

Reactive & functional polymers

SCI
ISSN：1381-5148
年,卷(期)：2025.207(Feb.)
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