302 results about "Cyclic ether" patented technology

The invention provides a solid polymer electrolyte capable of working in a wide temperature range. The solid polymer electrolyte is obtained by carrying out in-situ polymerization on a precursor solution on the surface of a base material, wherein the precursor solution is prepared from a first type of polymeric monomer, a second type of polymeric monomer, an initiator and electrolyte salt; the first polymeric monomer is an electron donor, and the electron donor is at least one of cyclic ether and olefin monomers; the second polymeric monomer is an electron acceptor, and the electron acceptor is one or more of cyclic ester, olefin monomers and anhydride monomers. The solid polymer electrolyte keeps good mechanical performance and high ionic conductivity in a wide temperature range, and an assembled solid secondary battery has good electrical performance and cycling stability.

The invention belongs to the technical field of new energy materials and devices, and relates to a gel electrolyte, a preparation method and a solid-state lithium battery, a liquid novel initiator with a low freezing point, a cyclic ether polymeric monomer and a plasticizer are mixed to form a homogeneous precursor solution, the precursor solution is injected into a battery shell, standing is performed at normal temperature (20-35 DEG C) for in-situ polymerization, and the solid-state lithium battery is obtained. And the gel electrolyte-based solid-state battery can be obtained. The gel electrolyte is initiated by a novel initiator, and compared with a common initiator, the gel electrolyte has better low-temperature performance, and a high-performance solid-state lithium battery is formed.

The embodiment of the invention relates to a negative-electrode-free sodium-ion battery electrolyte and a preparation method and application thereof, and the negative-electrode-free sodium-ion battery electrolyte comprises a non-fluorinated conventional ether substance, a fluoroether substance and a sodium salt; the mass percent of the non-fluorinated conventional ether substance, the fluoroether substance and the sodium salt is (5%-85%): (5%-85%): (5%-30%); wherein the non-fluorinated conventional ether substances comprise linear ether and / or cyclic ether. Compared with the traditional carbonic ester electrolyte, the negative-electrode-free sodium ion battery electrolyte provided by the embodiment of the invention has the advantages that the transmission rate of sodium ions can be improved, the sodium ions can be subjected to reversible deposition with high coulombic efficiency on a pure current collector, and the overall oxidation stability of the electrolyte is improved; the prepared sodium ion battery without the negative electrode can stably operate under high working voltage and has excellent electrochemical performance.

The invention relates to the technical field of lithium battery electrolytes, in particular to a preparation method of a polyether-based solid electrolyte and application of the polyether-based solid electrolyte in electrochemical devices such as lithium metal batteries. The polyether-based solid electrolyte material comprises a porous polymer skeleton, a cyclic ether monomer, a copper-based compound, a lithium salt and a plasticizing additive. The preparation method comprises the following steps: loading a copper-based compound into a porous polymer skeleton, adding cyclic ether, lithium salt and the like to carry out in-situ ring opening polymerization, cooperatively constructing a polyether-porous polymer skeleton three-dimensional network structure, and improving the mechanical strength of the electrolyte. Wherein the copper-based compound widens the chain spacing of the porous polymer, and is convenient for the cyclic ether monomer to penetrate into the skeleton; meanwhile, the in-situ ring-opening polymerization of the cyclic ether promotes the close contact between the electrolyte and an electrode, the interface impedance is reduced, and the ionic conductivity is improved. The polyether-based solid electrolyte prepared by the invention can promote stable circulation of a lithium metal battery.

The present disclosure relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery comprising the same, and the electrolyte for the lithium-sulfur battery comprises a lithium salt and a nonaqueous solvent, wherein the nonaqueous solvent comprises glycol ether, cyclic ether and acyclic ether represented by the following chemical formula 1, the acyclic ether is included in an amount of 15 vol % or less based on the total volume of the nonaqueous solvent, and a ratio of a total volume of the glycol ether to a total volume of the acyclic ether is 5 or more:R1—O—R2  [Chemical formula 1]where R1 is an unsubstituted or substituted C1 to C3 alkyl group, and R2 is an unsubstituted or substituted C3 to C20 alkyl group.

The embodiment of the invention relates to a method for initiating in-situ polymerization of an electrolyte solution through electrochemical induction. A solvent of the electrolyte solution comprises cyclic ether molecules and halogen atom substituted ethylene carbonate molecules; the method comprises the following steps: carrying out constant-current charging on a battery to a set voltage, and carrying out constant-voltage charging for a specific time under the set voltage, so that halogen atoms of halogen atom substituted ethylene carbonate molecules are removed under the reduction potential of the negative electrode side of the battery to generate free radical sites, two molecular structures after halogen atoms are removed are mutually combined through the free radical sites to form a dimer, the dimer is migrated to the positive electrode side in an electrolyte solution, dehydrogenation reaction is carried out under the action of oxidation potential applied to the positive electrode side, and in-situ ring-opening polymerization reaction of cyclic ether molecules is initiated through removed hydrogen ions; therefore, in-situ polymerization solidification of the electrolyte solution is realized under the condition that a conventional initiator is not contained.

The present invention relates to a polymer electrolyte comprising a co-polymer and alkali metal ions, the co-polymer comprising a first, a second and optionally a third constitutional unit, wherein, the first constitutional unit is formed from a first monomer selected from the group consisting of a 5 to 8 membered cyclic carbonate and a 5 to 8 membered cyclic ether, wherein said cyclic carbonate or cyclic ether comprises an unsaturated carbon-carbon bond or is substituted by a methylidene, vinyl or allyl group, and is unsubstituted or substituted by one or two C1-6alkyl or phenyl groups; the second constitutional unit is formed from a second monomer selected from the group consisting of a C1-6alkyl acrylate and a C1-6alkyl methacrylate, said C1-6alkyl of the C1-6alkyl acrylate or C1-6alkyl methacrylate substituted by one or more halogen atoms; and the third constitutional unit is formed from a third monomer selected from the group consisting of a poly(ethylene glycol) acrylate and poly(ethylene glycol) methacrylate Also disclosed herein is a method of preparing the polymer electrolyte of the present invention and a battery comprising the polymer electrolyte of the present invention.

The invention provides an electrolyte suitable for a lithium negative electrode or a negative-electrode-free lithium battery, a lithium metal battery and a negative-electrode-free battery. The electrolyte comprises a solvent, a diluent and fluorine-containing lithium salt, wherein the solvent is selected from one or more of a linear ether solvent, a cyclic ether solvent and a siloxane solvent, and the linear ether solvent, the cyclic ether solvent and the siloxane solvent optionally have cyano substituent groups; the diluent is selected from one or more of a group consisting of fluoro aromatic hydrocarbon and fluoro alkane. The specific solvent and diluent are used, and the additive is further used, so that the electrochemical stability window and the capacity retention ratio and the lithium deposition efficiency of the battery are remarkably improved.

The invention discloses a polymer solid electrolyte and a preparation method of a negative-electrode-free solid sodium battery, and belongs to the technical field of new energy. The method comprises the following steps: dissolving sodium salt in an organic solvent, adding a polymer monomer, and fully stirring to obtain a solid electrolyte precursor solution; secondly, at room temperature, adding a polymerization initiator into the solid electrolyte precursor solution to initiate a cross-linking polymerization reaction, and standing at room temperature to obtain a polymer solid electrolyte; and finally, adding the polymer solid electrolyte between the positive electrode of the sodium-ion battery and the metal current collector to prepare the negative-electrode-free solid-state sodium battery. A Lewis acid initiator is utilized to initiate a cross-linking polymerization reaction of cyclic ether, a polymer solid electrolyte with high ionic conductivity is obtained at room temperature, and the solid sodium battery without a negative electrode is created by utilizing the polymer solid electrolyte, an existing sodium ion battery positive electrode material and a metal current collector; the mass specific energy of the negative-electrode-free solid-state sodium battery is greater than 350Wh kg <-1 >, the cycle life is 400 times, and the negative-electrode-free solid-state sodium battery does not generate smoke and fire under a mechanical puncture condition and has excellent safety.

The invention provides a gel electrolyte with a controllable polymerization degree, a preparation method of the gel electrolyte, a semi-solid lithium ion secondary battery and a preparation method of the semi-solid lithium ion secondary battery, and relates to the technical field of lithium ion batteries. Raw materials for preparing the gel electrolyte comprise a cyclic ether monomer, an initiator and a polymerization inhibitor; the cyclic ether monomer is subjected to ring opening polymerization to obtain an ether polymer; the polymerization inhibitor is an inorganic lithium salt, and the polymerization degree of the gel electrolyte is determined by the dosage of the polymerization inhibitor and the dosage of the initiator. The gel electrolyte provided by the invention has the fluidity advantage of a liquid electrolyte and the flexibility advantage of a solid polymer electrolyte, and is beneficial to maintaining a stable contact interface between the electrolyte and an electrode, reducing interface impedance and improving ion transmission.

The invention discloses a synthesis process of chiral cyclic ether indole. The synthesis process comprises the following steps: reacting 4-bromobenzaldehyde with malonic acid under the catalysis of piperidine to generate olefin carboxylic acid CHP-1; carrying out condensation reaction to prepare CHP-2; under the catalysis of a copper reagent, carrying out Michael addition reaction to obtain CHP-3; preparing a chiral alcohol intermediate CHP-4 through a reduction reaction; trifluoromethanesulfonic acid is used, and a chiral ether intermediate CHP-5 is prepared through ring closing; reacting with protected hydrazine by using a copper ion catalyst to obtain an intermediate CHP-6; the method comprises the following steps: by taking alcohol as a solvent, adding strong acid, and removing a protecting group of hydrazine to obtain an intermediate CHP-7; and carrying out ring closing by taking lewis acid as a catalyst to obtain an indole product CHP-8. The use of a noble metal catalyst palladium is avoided, and the cost is greatly reduced. The chiral center is directly constructed through a chemical method, and SFC is not needed for resolution, so that the cost is remarkably reduced, and industrial production is successfully realized.

The invention discloses a low-temperature sodium metal battery electrolyte and a preparation method and application thereof, and belongs to the technical field of energy storage batteries. The low-temperature sodium metal battery electrolyte provided by the invention is prepared by dissolving sodium salt in ethylene glycol diethyl ether (EGDEE) and cyclopentyl methyl ether (CPME). The ethyl chain at the tail end of EGDEE in the electrolyte prepared by the invention allows more anions to enter the first solvation sheath of the hybrid solvent, so that the ionic conductivity at the ultralow temperature of-40 DEG C is greatly improved. Meanwhile, a novel anion-rich solvation structure can be spontaneously formed at low temperature, and the kinematic mechanics rate of Na < + > is increased. Meanwhile, two organic solvents with non-cyclic ether structures are adopted, so that the problem of easy ring opening in the prior art is solved, ultralow sodium nucleation overpotential is shown, and uniform sodium deposition can be realized, so that the composite material has excellent reversibility and cycling stability at room temperature and low temperature, has excellent electrochemical performance, and is suitable for industrial production. And the prepared sodium metal battery has a wide application prospect.

The invention discloses a preparation method of an in-situ self-generated diaphragm type dual-network polymer electrolyte and a battery, and belongs to the technical field of lithium batteries. A staged in-situ polymerization strategy is adopted and comprises the following steps: firstly, applying a precursor solution containing an acrylate monomer, a polythiol cross-linking agent, a cyclic ether monomer, an initiator and a lithium salt to the surface of an electrode, partially polymerizing the solution under first initiation conditions such as transient ultraviolet irradiation and the like, and generating a layer of semi-solid gel diaphragm on the surface of the electrode in situ; then, an electrode with the gel diaphragm and a counter electrode are safely assembled into a battery; and finally, under second initiation conditions such as room temperature curing and the like, integrally curing and forming the dual-network polymer electrolyte in the battery. According to the method disclosed by the invention, physical isolation is realized by ingeniously utilizing the intermediate-state gel diaphragm, and the prepared electrolyte has high ionic conductivity, high mechanical strength and excellent interface stability, so that the assembled diaphragm-free solid-state lithium battery shows ultra-long cycle life.

Moulding material mixture of natural and / or ceramic sands with a phenol-formaldehyde resin-free binder for foundry moulding sands, wherein the binder is either ➢as a one-component binder based on polyurethane and / or polyurea, comprising an aromatic or aliphatic oligomeric and / or polymeric isocyanate or a mixture of several aromatic and / or aliphatic oligomeric and / or polymeric isocyanates with partially delayed reactivity, and as an additive a non-functional diluent, wherein the isocyanates consist entirely or partially of pre-crosslinked reaction products, and wherein the pre-crosslinking is brought about by the reaction with di- or polyfunctional polyols with a stoichiometric deficit of hydrogen-active compounds, resulting in a residual content of free isocyanate groups in the range of 5 to 35%, and wherein the one-component binder is suitable for a multi-phase curing process using water-alcohol mixtures, or ➢ as a two-component binder based on polyurethane and / or polyurea, comprising . a component A with an average hydrogen functionality of 2.0 to 3.9, with an average equivalent weight of 450 to 900 g / eq of the reactants and with functional and / or non-functional additives that control the reactivity, non-functional admixtures that promote processability and ensure stability, wherein the reactants of component A are polyether alcohol mixtures of hydroxyl and / or mercapto groups and / or internal nitrogen-containing individual components, wherein the hydrogen-active compounds of the mixture of component A • two- to eight-functional polyether alcohols obtained by anionic or cationic ring-opening polymerization of cyclic ethers and simultaneous addition of the resulting polyether chains to OH / NH starter molecules and / or • Polythiols resulting from the esterification reaction of 3-mercaptopropionic acid with two or more alcohols or which are hydrogen-active polysulfide polymers with free SH groups, are selected and combined, and • an isocyanate-containing component B is present.

The invention belongs to the technical field of sodium secondary batteries, and particularly relates to a sodium battery electrolyte and a sodium metal / negative-electrode-free sodium battery, the sodium battery electrolyte comprises the following components: a sodium salt and an ether solvent; the ether solvent is a multi-chain ether solvent or a cyclic ether solvent; wherein the multi-chain ether solvent is chain ether containing a branched chain; according to the invention, the multi-chain ether solvent or the cyclic ether solvent is introduced, and the ability of the multi-chain ether solvent or the cyclic ether solvent to form a multipoint coordination configuration with sodium ions can be hindered on the basis that branched chains in the multi-chain ether and a cyclic structure of the cyclic ether have a relatively large steric hindrance effect, so that the dissociation degree of the sodium salt is slightly reduced, and the dissociation efficiency of the sodium salt is improved. According to the present invention, the sodium ion desolvation difficulty is significantly reduced, the sodium ion rapid desolvation is achieved, and particularly the desolvation advantage in the low temperature environment of-70-60 DEG C is significant, such that the efficient reversible deposition-stripping of the sodium metal at the low temperature is achieved, the formation of the sodium dendrite is avoided, and the application of the sodium metal battery under different environmental conditions is improved.

The present invention relates to a method for preparing an isohexide-based polycarbonate copolymer. The isohexide-based polycarbonate copolymer is obtained by sequentially carrying out a transesterification reaction, a pre-polycondensation reaction, and a final polycondensation reaction on diol and dialkyl carbonate under the action of a catalyst, wherein the diol includes diol A1 and diol A2, or further includes diol A3; the diol A1 is isohexide; the molecular structural formula of the diol A2 contains a cyclic ether structure and two primary hydroxyl groups, and the primary hydroxyl groups are linked to the cyclic ether structure via a methylene group; the diol A3 is a dihydroxy compound; and during the pre-polycondensation reaction, the temperature is first gradually increased to 180-200ºC within 5-15 min, the pressure is gradually reduced to 45-55 kPa within 5 min, and finally, gradient heating and gradient pressure reduction are carried out. The copolymer prepared by the present invention has high molecular weight, high heat resistance, high strength, high toughness, and transparency, and thus has a wide range of applications.

The invention discloses a molecular recovery type SBS modified asphalt regeneration agent and a preparation method thereof, which is prepared from a toughness recovery agent, a rigidity recovery agent, a plasticizer, a reaction auxiliary agent, and a network former; the toughness recovery agent is a mixture of aliphatic cyclic ether and aliphatic enol in a mass ratio of 4:1, the rigidity recovery agent is an aromatic cyclic ether, the plasticizer is activated by biological heavy oil and waste rubber powder in a mass ratio of 5:1, the reaction auxiliary agent is a tertiary amine compound, and the network former is a polyvalent primary amine compound. The regeneration agent of the invention can not only restore the component composition of the aged asphalt, but also balance the rigid-flexible block ratio of the SBS molecule after regeneration through the toughness recovery agent and the rigidity recovery agent, solve the problem of significant decrease in the high temperature performance of the regenerated SBS, and use the network former to fully restore the cross-linked network structure of the SBS, thereby improving the comprehensive road performance of the regenerated SBS modified asphalt. The formula is unique, the performance is excellent, and the application prospect is broad.

The present invention belongs to the technical field of new energy materials and devices, and relates to a gel electrolyte, a preparation method, and a solid-state lithium battery. A liquid novel initiator with a lower freezing point, a cyclic ether-based polymerizable monomer, and a plasticizer are mixed to form a homogeneous precursor solution. The precursor solution is injected into a battery casing and left to stand at room temperature (20°C - 35°C) for in-situ polymerization, and a gel electrolyte-based solid-state battery can be obtained. This gel electrolyte is initiated by a novel initiator and has better low-temperature performance compared with that initiated by a common initiator, forming a high-performance solid-state lithium battery.

The present invention provides a processing solution for semiconductor devices that excels in suppressing defects, a method for processing substrates, and a method for manufacturing semiconductor devices. [Solution] The present invention provides a processing solution for semiconductor devices, a method for processing substrates, and a method for manufacturing semiconductor devices, all of which contain a quaternary ammonium hydroxide compound, a cyclic ether compound, and an alkyl ketone, wherein the total content of the cyclic ether compound and the alkyl ketone is 0.001 ppm or more and less than 5 ppm.

Electrolyte compositions for secondary batteries having a metal anode are provided. The compositions include an electrolyte salt of an alkali metal, an alkaline earth metal, zinc, or aluminum; at least one solvent which solubilizes the electrolyte salt; and up to 25 wt. % of a selected non-polar additive. The solvent is selected from cyclic sulfones, cyclic sultones, cyclic ethers, partially fluorinated sulfonamides, fluorinated solvents and glymes. The nonpolar additive is selected from aromatic hydrocarbons, partially fluorinated aromatic hydrocarbons, fluorinated monoethers, partly fluorinated polyethers, fluorinated phosphate esters and fluorinated linear sulfones. Multiple combinations of metal salts, solvents and nonpolar additives having a coulombic efficiency of with respect to plating and stripping of the metal of at least 90% are provided.

The application discloses a synthesis method of a chiral cyclic ether, the chiral cyclic ether and application of the chiral cyclic ether. The synthesis method comprises the following steps: reacting a compound shown in a structural formula I with hydrogen in the presence of a catalyst to obtain the chiral cyclic ether shown in a structural formula II. The synthesis method is simple in a reaction system, easy to operate and high in economic benefits.

The application discloses a conjugated polymer material capable of realizing neutral state green / black-transparent electrochromic performance and a preparation method and application thereof. The conjugated polymer material (IV) is prepared through copolymerization of a cyclic ether modified p-dibromobenzene ring monomer (I), a thiophene derivative ProDOT monomer (II) and a D-A-D unit ProDOT-BTD-ProDOT coupling monomer (III). The electrochromic polymer thin film processed from the conjugated polymer material has application prospects in the fields of intelligent windows, intelligent glasses, displays, electronic paper and the like. In the material, the cyclic ether modified p-dibromobenzene ring monomer effectively reduces the oxidation potential of the conjugated polymer, improves the electrochromic performance of the black / green-transparent electrochromic thin film, and realizes stable and reversible conversion.

A preparation method and application of gradient polymerization solid-state battery electrodes, belonging to the field of chemical power supply technology. Specifically comprising the following steps: NASICON type inorganic solid electrolyte Na3Zr2Si2PO 12 The electrode is prepared in a gradient distribution in the electrode material, and an electrolyte precursor solution containing a cyclic ether monomer and an initiator is injected into the electrode. The NASICON type inorganic solid electrolyte Na3Zr2Si2PO4 is distributed in a gradient 12 Inhibit the action of the initiator and the cyclic ether monomer, realize the gradient polymerization of the cyclic ether polymer electrolyte in the electrode, and obtain the gradient polymerization solid-state battery electrode. The NASICON inorganic solid electrolyte Na3Zr2Si2PO 12 The amount of addition decreases gradually from the direction close to the current collector to the direction away from the current collector. The present invention provides an innovative electrode solution for the realization of high-power, high-cycle stability solid-state batteries.

The invention relates to a method for producing polyacetal resin. Provided is a method for producing a polyacetal resin with which it is possible to stably and continuously produce a polyacetal resin over a long period of time while suppressing the generation of a tar-like precipitate caused by a polymerization catalyst. A method for producing a polyacetal resin, characterized by comprising a polymerization step in which a polymerization reaction is carried out using (a) a cyclic ether and / or a cyclic formal containing at least trioxymethylene, (b) boron trifluoride or a boron trifluoride complex, and (c) an organic solvent. And the organic solvent (c) is a compound represented by a predetermined formula (1).

The invention relates to a method for producing polyacetal. In a method for producing polyacetal using a cationic active catalyst, the cationic active catalyst is efficiently deactivated and washed, thereby producing polyacetal having excellent thermal stability. A method for producing a polyacetal, characterized by comprising: a polymerization step for polymerizing at least one cyclic ether and / or cyclic formal containing trioxymethylene in the presence of at least one cationic active catalyst; and a deactivating and washing step in which the crude polyacetal obtained in the polymerization step is brought into contact with a deactivating and washing solution obtained by dissolving or suspending a basic compound in an aliphatic hydrocarbon solvent, thereby deactivating and washing the cationic active catalyst in the same step.

To provide a release film having both excellent releasability and blocking resistance.SOLUTION: The release film includes a polyester film substrate and a release layer on a first surface side of the polyester film substrate. The release layer is formed of a release agent composition containing a curable silicone resin, a three-membered ring cyclic ether compound, and a four-membered ring cyclic ether compound. The content of the four-membered ring cyclic ether compound contained in the release agent composition is 0.5-20 mass% based on 100 mass% of the solid content. The arithmetic mean height (Sa) of a second surface of the polyester film substrate is 40-100 nm.SELECTED DRAWING: None

This invention provides a UV-curable coating composition, its preparation method, and its application. The UV-curable coating composition of this invention comprises the following components in parts by weight: 40-60 parts of silicone-modified polyurethane acrylate, 5-30 parts of cyclic ether acrylate or its derivatives, 2-10 parts of silane coupling agent, 30-80 parts of filler, and 0.5-5 parts of photoinitiator; wherein the reaction raw materials for the silicone-modified polyurethane acrylate include the following components in parts by weight: 15-30 parts of isocyanate, 20-100 parts of hydroxyl-terminated polydimethylsiloxane, 20-100 parts of aromatic polyester polyol, and 3-15 parts of end-capping agent. By using hydroxyl-terminated polydimethylsiloxane to modify the polyurethane acrylate, and simultaneously adding cyclic ether acrylate or its derivatives as diluent monomers to the coating composition, the resulting coating exhibits high resistance to damp heat, high strength, and high elasticity.

This invention discloses a method for preparing polyethylene cyclohexanedicarboxylate (PECCHD) from waste PET. Specifically, it relates to a solvent composition for dissolving PET, characterized in that the solvent composition comprises a first solvent and a second solvent; the first solvent is a haloalcohol solvent or a cyclic ether solvent; the second solvent is one or more of a cyclic ether solvent, a chain ether solvent, a nitrile solvent, a ketone solvent, or a haloalkane solvent; the chain ether solvent is a chain ether solvent with 2-4 oxygen atoms; the volume ratio of the first solvent to the second solvent is 1:(1-5); the first solvent and the second solvent are not the same solvent. This method has significant advantages in terms of raw material adaptability, reaction efficiency, and industrialization potential, achieving a highly efficient conversion from low-end waste PET to high-value-added PECHD.

The application belongs to the technical field of secondary batteries, and more particularly relates to a low-temperature microemulsion electrolyte, a preparation method and application thereof. The low-temperature microemulsion electrolyte comprises an electrolyte salt, a symmetrical cyclic ether solvent, a highly chlorinated solvent insoluble in the symmetrical cyclic ether solvent, and a chlorinated ether solvent for dispersing the highly chlorinated solvent in the symmetrical cyclic ether solvent in the form of micelles. Through synergistic effect of the components, an electrolyte system with high ion conductivity, electrode interface stability and wide temperature range adaptability is constructed, effectively solving the core problems of kinetic sluggishness, poor interface stability and short cycle life of the secondary battery in an ultra-low temperature environment. The electrolyte remains liquid at -70 DEG C, and exhibits excellent cycle stability in a wide temperature range of -40 DEG C to 25 DEG C, giving the battery excellent wide temperature range adaptability, breaking the low-temperature performance bottleneck of the secondary battery, and having a broad application prospect.

Provided is a method of producing a lithium ion secondary battery, the method including: a charge and discharge treatment step of subjecting a first lithium ion secondary battery including a positive electrode having a positive electrode active material layer containing a sulfur-modified compound, a first liquid electrolyte, and a negative electrode to charge and discharge treatment; and a replacement step of replacing the first liquid electrolyte with a second liquid electrolyte to provide a second lithium ion secondary battery after the charge and discharge treatment step, wherein the first liquid electrolyte contains a solvent selected from the group consisting of: a saturated cyclic carbonate compound; and a saturated chain carbonate compound, and wherein the second liquid electrolyte contains a solvent selected from the group consisting of: a saturated cyclic ether compound; and a saturated chain ether compound.