Preparation Of Cellulose-based Polymer Electrolyte And Its Application In Intelligent Luminescent Furniture

As people relentlessly pursue a high-quality life,home automation has become an unstoppable trend.Whether it is the increase of intelligent modules in furniture products or the use of network wireless technology for smart interconnection,they all heavily rely on wired power supply or energy storage devices.On the other hand,with the continuous development of smart homes,the integration of lighting and furniture has become a future trend,giving rise to intelligent furniture with lighting functions,which greatly satisfies people’s high requirements for quality of life.Luminescent furniture with both energy storage and lighting functions has become a hot research topic.Therefore,this study used environmentally friendly cellulose material as the polymer matrix to prepare safe,eco-friendly,and efficient aqueous and quasi-solid polymer electrolytes,and assembled a new generation of energy storage device,zinc-ion batteries.On this basis,fluorescent materials were further doped,a luminescent electrolyte was developed,and a luminescent energy storage device was designed and assembled for the first time,which was successfully applied to smart homes and luminous furniture.The main research contents include:（1）The optimal dissolution conditions of cellulose in zinc chloride（ZnCl₂）dissolution system and the mechanism of maintaining high stability of ZnCl₂/cellulose solution were studied.Firstly,ZnCl₂ with different crystal waters was prepared,and then the effects of heating temperature and time on cellulose dissolution were investigated.The results show that:ZnCl₂·3H₂O can efficiently dissolve more cellulose at 90°C.（2）A transparent tubular cell was designed and prepared for convenient and quick characterization of electrolyte properties,observation of interface phenomena and construction of luminescent energy storage devices.A silver chloride pseudo-reference electrode（P-RE）was homemade by simple electroplating,and a three-electrode test system was constructed.Cyclic voltammetry indicated that the prepared P-RE and tubular cell had excellent stability and could handle various electrochemical characterizations.At the same time,the transparent tube provided convenience for in-situ observation and luminescent function realization.（3）ZnCl₂/cellulose/melamine gel polymer electrolyte（GPE）was prepared by hydrothermal method.The introduction of melamine transformed the liquid ZnCl₂/cellulose solution into a gel state,improving the safety of the battery.Compared with liquid electrolyte（LE）,the cyclic stability of the prepared GPE was slightly improved,thanks to the inhibitory effect of cellulose on dendrites.However,the dendrite issue is still serious.Although melamine interacted with cellulose to form a gel,it accelerated the growth of zinc dendrites itself.（4）A novel aqueous electrolyte was prepared by adding a small amount of polyethylene glycol（PEG）to ZnCl₂/cellulose solution.The ion channel and“physical barrier”formed by cellulose and PEG effectively induced the regular deposition of zinc ions and inhibited the growth of dendrites.The obtained electrolyte has excellent ionic conductivity(33.29 m S cm^-1)and excellent cycle performance,achieving ultra-long cycle life of 1500 h and 1000 h at current densities of 0.2 m A cm^-2 and 2 m A cm^-2,respectively.（5）ZnCl₂/cellulose/PEG GPE was prepared by increasing the concentration of cellulose.The electrolyte has good flexibility,considerable ionic conductivity and lower hydrogen evolution potential.The low polarization voltage was maintained for up to 700 h at a high current density of2 m A cm^-2,which is much higher than that of LE.Using vanadium pentoxide and prussian blue as cathodes,the pouch batteries were prepared with initial capacities of 384.6 m Ah g^-1 and 69.8 m Ah g^-1,respectively.After 50 cycles,the capacity retention rates were 55.3%and 94.3%,respectively.（6）Luminescent electrolytes were prepared by synthesizingβ-Sialon:Eu²⁺and K₂Ti F₆:Mn⁴⁺phosphors and adding them into ZnCl₂/cellulose/PEG aqueous electrolyte.Under the excitation of ultraviolet light,the electrolyte successfully achieved bright self-luminescence.The electrolyte was then filled into a tubular cell to assemble a luminescent energy storage device,and the feasibility of its application in smart wardrobes was discussed.Further optimization of luminescent electrolytes can enable energy-free luminescence using natural light and provide convenient charging services,making them highly competitive and possessing enormous application potential in outdoor luminous furniture.