Analyses the latest research progress of the lithium-ion polymer battery electrolyte

Source: 2020 - 04 - 10 but when hits: time the research progress of lithium ion battery with polymer electrolyte abstract: solid polymer electrolyte and gel polymer electrolyte were reviewed. Discussed the properties of the polymer electrolyte, type, polymerization method and development prospects. Key words: polymer electrolyte; Polymer types; Ionic conductivity of polymer lithium ion battery is on the basis of traditional liquid lithium ion battery has developed a new type of lithium ion batteries, the present research is to replace the traditional polymer electrolyte using liquid electrolyte of lithium ion battery, polymer battery diaphragm, polymer electrolyte battery, lithium-ion battery diaphragm and the function of the electrolyte, can from the anode diaphragm isolation materials, internal short circuit in the battery self-discharge and not, and since the electrolyte is the anode conductive lithium ion between ', therefore, lithium polymer battery has liquid high voltage battery! The characteristics of long life, clean pollution-free, and because it USES all solid state or semi-solid structure, overcome the liquid electrolyte battery easy leakage, short circuit faults! Safe enough, at the same time make up for the inorganic solid electrolyte low electrical conductivity. Brittle big! The formation of the poor film! The defects of poor mechanical deformation. In 1996, Bellcore company unveiled a set of relatively complete polymer lithium battery technology, large-scale caused wide public concern. Performance! On polymerization method and polymer type is studied and compared, and the prospects of the development of polymer electrolyte was predicted. 1 full solid polymer electrolyte full solid polymer electrolyte ( SPE) Is the combination of polymer and lithium, can dissolve the lithium salt and promote its dissociation and rapid migration of ions. In 1973, polyoxyethylene (Wright is the first time PEO) The coordination with ionic conductivity and the alkali metal salt. Li + move along the amorphous part of the polymer chain segment, completed the lithium ions and polymer complex! Coordination and coordination of the circulation process is shown in figure 3. 'but the pure room temperature conductivity of solid polymer electrolyte is usually only about 10 - 6 ~ 10 - 7scm- 1, which cannot meet the practical application of lithium ion battery, so how to improve the ionic conductivity SPE is the primary consideration. 'the main way is through copolymerization. Hybrid! Pick up! Crosslinking and suppressed using plasticizer lithium polymer crystallization. Reduce the glass transition temperature, increase the ability of chain segment moving aim is to increase the carrier mobility. Through the copolymerization can inhibit the crystallization of polymer or improve the movement of the polymer chain. Booth et al. , first reported the epoxy ethane in 1990; Oxygen methylene random copolymer, oxygen methylene random embedded destroyed the PEO regularity of helical structure and inhibit the crystallization of polymer system, thus accelerate the lithium ion migration, such as gold phosphate as coupling agent and polyethylene glycol ( PEG) And poly ( Self diol ( PTMC) Copolymer have linear random copolymer, phosphorus L ( PC) ( As shown in figure 2) By increasing local sports ability to improve conductivity of polymer chain segment. 1. 2 blending polymer electrolyte two or a combination of two or more polymer should be well tolerated, between various components should have good mechanical properties and strong solubility of lithium! Composite Li + the ability. Common with polyvinyl alcohol ( PVA) , polystyrene, PS) , poly (vinylidene fluoride ( PVDF) , polyacrylonitrile ( PAN) And poly (methyl methacrylate ( PMMA) 。 Enki mixing styrene butadiene rubber and nitrile rubber, made from 'dual phase electrolyte. Nonpolar styrene-butadiene rubber is to ensure that the electrolytic hydraulic support to learn the good performance of phase 1. 3 grafted polymer electrolyte by 'grafting' means that low molecular weight organic compounds, such as the PEO transplanted into the macromolecular main chain form 'comb structure of grafted polymers, graft modification of polymer crystallinity reduced' due to the ionic conduction depends on the short-range amorphous polymer chain segment motion, thus reduce the crystallization of polymer sex as far as possible reduce the glass transition temperature of polymer, to improve the content of the amorphous area, meet the needs of the normal temperature lithium ion migration.