102results about How to "High room temperature ionic conductivity" patented technology

The invention relates to a Li2S-P2S5-TiS2 amorphous electrolyte material with high room-temperature ironic conductivity, and belongs to the field of preparation of lithium ion battery related materials. The Li2S-P2S5-TiS2 amorphous electrolyte material is prepared by application of high-energy ball milling and low-temperature solid-phase reaction, and a preparation method of the Li2S-P2S5-TiS2 amorphous electrolyte material comprises following steps: in a glove box with argon protective atmosphere, three raw materials Li2S, P2S5 and TiS2 are mixed uniformly at a mole ratio of 34:15:1; agate balls are placed in a ball milling tank, and the mixture of the three raw materials is sealed in argon protective atmosphere, and is subjected to high-energy ball milling treatment; samples after ball milling treatment are added into a tube furnace, and is sintered at 300 DEG C for 3h in argon atmosphere so as to obtain the Li2S-P2S5-TiS2 amorphous electrolyte material. The Li2S-P2S5-TiS2 amorphous electrolyte material is prepared by combining high-energy ball milling and low-temperature solid-phase reaction, so that the Li2S-P2S5-TiS2 amorphous electrolyte material possesses relatively high room-temperature ironic conductivity, preparation technologies are simple, and reaction conditions are mild.

The invention discloses a montmorillonite-based composite solid electrolyte and a solid-state lithium battery. The montmorillonite-based composite solid electrolyte comprises a lithium montmorilloniteinorganic single-ion conductor, a polymer with lithium ion transport ability, a lithium salt, a high-voltage-resistant organic additive and polytetrafluoroethylene with high adhesion property, The montmorillonite-based composite solid electrolyte takes lithium montmorillonite inorganic single ionic conductor as an electrolyte matrix, and the lithium montmorillonite inorganic single ionic conductor has high ion migration number, wide voltage window and high thermal stability. The montmorillonite-based composite solid electrolyte has high room temperature ionic conductivity () 10-4S cm-1), widevoltage window (4.2-5.5 V) and high ion migration numb () 0.5. That solid-state lithium battery assembled by the montmorillonite composite solid electrolyte of the invention has excellent cycle stability.

The invention relates to a lithium ion battery electrolyte, specifically to a solid-state lithium battery polymer electrolyte and a preparation method and an application thereof. The electrolyte comprises fluoroalkoxy lithium trifluoroborate, a polycarbonate type polymer and a porous supporting material; and the electrolyte is 20-100[mu]m in thickness, 1*10<-7>-9*10<-3>S/cm in ionic conductivity, minus 10 DEG C to 150 DEG C in working temperature, and greater than 5.0V(vs.Li<+>/Li) in electrochemical window. The invention also discloses a preparation method of the solid-state lithium battery polymer electrolyte. A lithium salt and a carbonate ester type polymer are dissolved into a solvent based on a certain proportion, then a membrane is made on the porous supporting material, and next, vacuum drying is performed to obtain the solid-state lithium battery polymer electrolyte. Compared with the conventional polymer electrolyte, the solid-state lithium battery polymer electrolyte has the advantages of high ionic conductivity, broad electrochemical window, high temperature working range and the like.

The invention discloses a composite gel polymer electrolyte preparation method and a lithium ion battery, wherein the preparation process of the composite gel polymer electrolyte comprises the steps of dissolution of a polymer, introduction of a cross-linking agent, dispersion of an inorganic filler, dissolution of a lithium salt, and slurry casting and film forming. By virtue of the prepared composite gel polymer electrolyte, the problems of relatively high solvent mobility and volatility, relatively poor electrochemical stability and the thermal stability, low ionic conductivity, low mechanical strength, poor electrolyte and electrode interface stability and the like of the traditional gel electrolyte are effectively improved; the composite gel polymer electrolyte has the advantages of high ionic conductivity at the room temperature, wide electrochemical voltage window, high mechanical performance and relatively high adhesion of the electrolyte to the positive electrode and the negative electrode, so that the safety performance and the electrochemical performance of the lithium ion battery are greatly improved; meanwhile, the preparation method is simple and rapid, and the cost is low; and the assembled lithium ion battery is light and thin in appearance and excellent in electrochemical performance, and has a very wide market application prospect.

The invention relates to the technical field of a lithium ion battery, and relates to a sulfide solid-state electrolyte modified by an oxide and a preparation method of the sulfide solid-state electrolyte. The invention provides the sulfide solid-state electrolyte Li3PS4-xOx by which Beta-phase Li3PS4 is modified by an oxide comprising one or more of lithium-oxygen, phosphorus-oxygen and lithium-phosphorus-oxygen, x is more than 0 but less than 4, and an organic liquid-state solvent dispersion method of the oxide-modified sulfide solid-state electrolyte which is efficiently prepared at a low temperature. With a nanometer structure formed by oxide modification and organic liquid-state solvent dispersion, the room-temperature and high-conductivity Beta-phase Li3PS4 is stabilized, the room-temperature ion conductivity of the electrolyte is improved, the air stability of the electrolyte is remarkably improved, and the evolution of H2S gas is reduced. The preparation method of the sulfide solid-state electrolyte material, provided by the invention is simple and is easy to operate.

The invention discloses a composite solid electrolyte material, a preparation method thereof, and an all-solid-state battery. The all-solid-state battery includes a positive electrode layer, a negative electrode layer, and the composite solid electrolyte material positioned between the positive electrode layer and the negative electrode layer. The composite solid electrolyte material includes polyoxyethylene, an inorganic powder having a high ionic conductivity, a plastic crystal compound and a lithium salt. The preparation method comprises the following steps: weighing the polyoxyethylene andthe lithium salt in proportion, adding the weighed substances to an organic solution, and performing stirring to obtain a solution A; weighing the inorganic powder and the plastic crystal compound inproportion, adding the weighed substances to the solution A, and performing stirring to obtain a uniformly mixed suspension B; and pouring the suspension B into a mold, and drying the suspension B inthe mold to obtain the organic/inorganic composite solid electrolyte material. The composite solid electrolyte material has an obviously improved room-temperature ionic conductivity and an enhanced electrochemical stability, and has a stable interface contact with a positive electrode and a negative electrode, and the capacity attenuation problem of the all-solid-state battery formed by assembling the composite solid electrolyte material is significantly improved.

The invention relates to a composite solid electrolyte with high ionic conductivity and a preparation method thereof, belonging to the technical field of solid electrolyte for lithium ion batteries. The composite solid electrolyte is composed of inorganic solid electrolyte, polymer electrolyte and lithium salt. The mass ratio of inorganic solid electrolyte, polymer electrolyte and lithium salt is0.2-0.8: 0.2-0.8: 0.05-0.5. The invention prepares inorganic solid electrolyte nanofibers by electrostatic spinning, prepares vertically oriented inorganic solid electrolyte skeleton by freeze castingmethod, and pours polymer and lithium salt to form composite solid electrolyte. Nanofibers instead of nanoparticles have obvious advantages in the preparation of intact and uniform inorganic solid electrolyte skeleton and the formation of fast Li + transport pathway, which can significantly improve the room temperature ionic conductivity of the electrolyte, up to 10<-4>S.cm<-1>. By adjusting thesize of nanofibers and freeze-casting conditions to control the skeleton structure, so as to regulate the comprehensive properties of the electrolyte.

The invention relates to a LLZO preparation method, a thermal cell quasi-solid electrolyte, and a preparation method thereof. The preparation method of the quasi-solid electrolyte comprises followingsteps: raw materials including Li2CO3, La2O3, ZrO2, H2C2O4, and an alkali metal halide are subjected to purification treatment, the needed Li2CO3, La2O3, H2C2O4, and ZrO2 are weighed, are grinded to be uniform, and are introduced into a sealed stainless steel tank for roasting at 1200 DEG C, natural cooling is carried out, an obtained product is subjected to ball milling to be uniform so as to obtain the lithium lanthanum zirconium oxygen solid state electrolyte (Li7La3Zr2O12, LLZO); the LLZO and an alkali metal halide co-molten salt are mixed again, the temperature is increased to 400 to 500DEG C under protection of argon gas rapidly, repeat vacuum pumping and slow pressurizing are carried out so that infiltration of the co-molten salt into the porous LLZO is realized, natural cooling iscarried out, and an obtained product is subjected to ball milling so as to obtain the thermal cell quasi-solid electrolyte. The prepared thermal cell quasi-solid electrolyte is low in crystal boundary resistance, and high in ion mobility, and heat stability.

The invention provides a preparation method of fluoro-compound gel polymer electrolyte membrane to obtain the electrolyte membrane high in electrochemical stability, and belongs to the technical fieldof lithium ion batteries. According to the scheme, the method comprises the steps that 1, according to weight parts, 5-50 parts of fluorine-containing vinyl monomer, 40-80 parts of gellable monomer and 0-3 parts of poly(ethylene glycol) methyl ether methacrylate monomer are added into 100-300 parts of solvent, nitrogen is introduced continuously, a mixture is stirred evenly, then 0.05-1.00 part of initiator is added, under a condition of 60 DEG C, reaction is carried out for 24 h, and after purification treatment is conducted, a polymer A is obtained; 2, 30-80 parts of polymer A and 0-20 parts of filler are added into 100-300 parts of solvent, in a dry nitrogen atmosphere, a mixture is stirred evenly, 0-2.00 parts of hydroxy cross-linking agent is added into a mixed system, mixed liquid is evenly coated onto a smooth mold, and in a nitrogen atmosphere, reaction is carried out; 3, after the reaction is completed, vacuum drying is conducted to obtain the fluoro-compound gel polymer electrolyte membrane.

The invention provides an electrolyte used for a lithium-sulfur battery and a preparation method of the electrolyte. The electrolyte comprises lithium salt, solvent and cosolvent, wherein the lithium salt is one or two kinds of lithium difluoro(oxalato)borate or lithium difluoro-malonate borate; the solvent is at least one kind of propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate or methyl ethyl carbonate; and the cosolvent is one or two kinds of fluoroethylene carbonate and vinylene carbonate. The preparation method of the electrolyte comprises the following steps of performing uniform mixing on the solvent and the cosolvent to form a mixed solvent; and adding lithium salt to the mixed solvent to be mixed uniformly to obtain the electrolyte. The electrolyte, by adopting the most basic lithium battery electrolyte raw materials, is rich in source, simple in preparation process, free of a stabilizer, suitable for industrial production and has excellent electrochemical performance.

The invention discloses a blended gel polymer electrolyte thin film with porous appearance and a preparation method thereof. In the composition, a blended polymer film comprises a polyether polyurethane lithium salt and PVDF (polyvinylidene fluoride), the range of the weight ratio of the two is (1: 5)-(1: 10), and an adsorbed liquid electrolyte component in the composition accounts for 40-70% by weight of the total weight. The preparation method comprises the following preparation steps of: firstly preparing the polyether polyurethane lithium salt by condensation polymerization, then mixing the polyether polyurethane lithium salt and the PVDF, dissolving in a mixed solution of N' N-dimethylformamide and glycerol, adopting a thermally induced phase separation method to obtain the blended polymer porous film, drying the thin film, then adsorbing the liquid electrolyte, and activating to obtain the blended gel polymer electrolyte thin film, wherein the optimal ion conductivity can achieve 5.63*10<-3>Scm<-1> at the temperature of 30 DEG C, and an electrochemical window achieves 4.8V. A product disclosed by the invention has good prospects when applied to the fields of polymer lithium ion batteries and the like.

The invention provides an organic/inorganic composite solid electrolyte with a bicontinuous structure and a preparation method thereof. The solid electrolyte comprises a three-dimensional porous LLZOframework material, an organic material and a lithium salt, wherein continuous through pores are uniformly distributed in the three-dimensional porous LLZO framework material, and the organic materialand the lithium salt are uniformly mixed and fully fill the pores in the three-dimensional porous LLZO framework material. According to the composite solid electrolyte prepared by the invention, thethree-dimensional porous LLZO is used as a framework material, and pores of the framework material are filled with the organic material and the lithium salt with relatively good ion conductivity, so that a bicontinuous ion conduction path is provided for lithium ions, and very high room-temperature ion conductivity (up to 1.33 * 10 <-3 > S/cm) is achieved.

The invention relates to a preparation method of a gel polymer electrolyte. The method comprises the following steps: mixing an electrolyte solvent, a polymerizable solvent monomer and an electrolytelithium salt to obtain an electrolyte composition; and adding cationic ions containing Li<+>, Al<3+>, Ga<3+> and In<3+> and anionic combinations of PF6<->, BF4<->, Cl<->, Br<->, I<-> and CF3SO3<-> orinitiators of BF3 compounds into the electrolyte composition, and polymerizing to generate the gel polymer electrolyte. The preparation method has the following beneficial effects: the epoxy ether monomer is self-polymerized, and the electrolyte is wrapped in the epoxy ether polymer to obtain the gel polymer electrolyte, so that the obtained gel polymer electrolyte has certain viscosity and relatively high room-temperature ionic conductivity.

The invention discloses a succinonitrile-based electrolyte coupled with an organic lithium salt and fluoroethylene carbonate, and relates to the technical field of lithium-ion batteries. The specificscheme is as follows: the succinonitrile-based electrolyte coupled with an organic lithium salt and fluoroethylene carbonate comprises succinonitrile, an organic lithium salt and fluoroethylene carbonate, wherein the molar ratio of the succinonitrile to the organic lithium salt is 100: 1-1:1, the organic lithium salt is a combination of a sulfonyl imide lithium salt and lithium oxalyldifluoroborate, the molar ratio of the sulfonyl imide lithium salt to the lithium oxalyldifluoroborate is 100: 1-1: 1, and the fluoroethylene carbonate accounts for 5-50% of the total volume of the succinonitrile-based electrolyte. The invention further discloses a preparation method of the succinonitrile-based electrolyte and application of the succinonitrile-based electrolyte to a lithium metal battery, theelectrolyte can form an organic-inorganic composite SEI film on the surface of metal lithium, side reaction of succinonitrile and metal lithium is avoided, and the interface stability and electrochemical performance of the battery are remarkably improved.

The invention provides an electrolyte matrix as well as a preparation method and application thereof. The electrolyte matrix comprises a PEO-PPO-PEO ternary block copolymer. According to the invention, the PEO-PPO-PEO ternary block copolymer is used as an electrolyte matrix, the film-forming property is good, the room-temperature ionic conductivity is high, and the room-temperature ionic conductivity is obviously higher than that of other conventional polymer electrolyte matrixes. The composite solid electrolyte provided by the invention takes the PEO-PPO-PEO ternary block copolymer as an electrolyte matrix and has the characteristics of high mechanical strength, good lithium dendrite resistance effect, excellent thermal stability and the like, an electrochemical stability window can reach 4V, and compared with a composite solid electrolyte prepared from other conventional polymer matrixes (PEO, PVDF, PAN or PMMA) at room temperature, the composite solid electrolyte prepared from the PEO-PPO-PEO ternary block copolymer has the higher ionic conductivity by one order of magnitude and can reach 4.5*10<-4> S/cm.