Binder Inducing Interaction Applied In Tailored Porous Carbonaceous Electrode

In efforts to facilitate batteries with synergistical parameters of energy density,power density and cycling lifespan,the electrode interface is required to be profoundly promoted.Consequently,the corresponding thermodynamics and kinetics strategies are employed to reveal the electrode process based on the binder and electrolyte.In this thesis,a balanced strategy has been put forward to meet the promising engineering enlargement of sodium-ion batteries?SIBs?and potassium-ion batteries?PIBs?.Systematically,based on the invalid-mechanism analysis,the detailed electrode kinetics process will be directly demonstrated,furthermore,generating a reliable structure-function relationship between the electrode interface and the battery performance.To be specific,the electrode interface,i.e.,the solid electrolyte interface?SEI?,can be tailor-made induced by the optimized binder-electrolyte system,which plays an overriding role in the initial Coulombic efficiency?ICE?,rate ability,specific capacity and lifespan of a battery.Therefore,obvious innovative features are as follows:Initially,to fabricate a SIB with NPHC-1200 anode,two hydrophilic binders that sodium alginate?SA?and carboxymethylcellulose?CMC?and an oleophilic binder polyvinylidene-fluoride?PVDF?are employed,hence rendering different structures of SEI,obtaining 344.4 mAh g^-1 with 94.3%retention after 100 cycles.Furthermore,adopting the invalid-mechanism analysis,a specific bluff-like capacity fading after 230 cycles(282 mAh g^-1)has been presented in the abovementioned battery,attributed to the non-matching SA binder and NaClO₄ electrolyte based on ex-situ tests.To fabricate PIBs with ball-milled graphite commercialized?BGC?to provide contribution of pseudo-capacitance in the storage of K-ion.Furthermore,a contradiction that high rate performance and high ICE has been indicated.Fortunately,by employing suitable binder-electrolyte system,concurrently acquiring high rate and ICE can be realized with trans-theoretical capacity of 305 mAh g^-1.In summary,based on strategies of matched binder-electrolyte and balanced binder-pseudo-capacitance with invalid mechanism,establishing the interface engineering.Consequently,it generates a positive significance on equilibration and industrialization.