graphite silicon composite anode material has high specific capacity and excellent conductivity, and has attractive prospects in high-performance lithium-ion batteries (LIBs). However, the recyclability and security issues of GSC are hindering its commercialization. This paper designs a flame retardant polymer crosslinked with polyammonium phosphate (APP) and polyacrylic (PAA) to improve the electrochemical performance of GSC anode and improve its security . The crosslinked polymer not only forms a three-dimensional network structure, but also enhances the mechanical properties of the composite electrode, and also covers evenly on the electrode surface, effectively reducing side reaction between the electrode and the electrolyte , thereby improving its magnification capacity and cyclic stability . As a result, the GSC/PAA anode crosslinked with 10% wt% APP provided a high capacity of 315 mAh g−1 at 0.5°C and operated stably for 1000 cycles under a 0.03% capacity decay period −1. More importantly, the peak heat release rate and total heat release value of the GSC/10APP-PAA anode were significantly reduced from 0.35 and 1.6 to 0.1 J s−1 and 0.6 J g−1, respectively, thereby shortening the self-extinguishing time, proving that crosslinked polymer plays a fireproof role in the thermal runaway process of LIBs .
Graphics and text introduction
crosslinked polymer synthesis and characterization. a) The reaction mechanism of PAA and APP, the optical photographs and molecular chain structure of PAA/H2O solution, APP/H2O solution and APP-PAA/H2O sol, b) 1H NMR, c) infrared spectra of APP, PAA and APP-PAA. The asterisk (*) indicates the peak value of solvent D2O. Research on the structural design and performance of
APP-PAA binder GSC anode. a) i) PAA conventional GSC anode and ii) schematic diagram of the preparation of crosslinked APP-PAA adhesive GSC anode; b) XRD spectrum and SEM image of GSC; c) GSC anode using PAA and d) SEM image of GSC anode using APP-PAA adhesive, e) EDS image, f) magnified view of silicon particles, g) load indentation depth curve of GSC anode using PAA and APP-PAA adhesive. Electrochemical properties of
APP-PAA binder GSC anode.
is based on the flame retardant behavior and full battery performance of different GSC anodes. a,b) Vertical ignition test photos, c) (a,c,d) (a,c,d) (a,c,d) GSC and (b - d) GSC/10APP electrode SET values and d) thermal release rate curve [(c) is a flame retardant mechanism, (d) is a comparison of total heat release (THR) values], e) Self-extinguishing full battery diagram, full bag battery flame retardant test results: f) Traditional LFP||GSC and g) Self-extinguishing LFP||GSC/10APP battery, h,i) LFP||GSC/10APP battery cycle capability and magnification.
Paper information
Paper title: Flame-Retardant Crosslinked Polymer Stabilizes Graphite–Silicon Composite Anode for Self-Extinguishing Lithium-Ion Batteries
Corresponding author: Yang Jinlong
Communication unit: Shenzhen University
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