755 results about "Vinylene carbonate" patented technology

A non-aqueous electrolyte comprising a non-aqueous solvent and a lithium salt dissolved therein, and a cyclic carbonate, linear carbonate, and vinylene carbonate having a chlorine content of 100 ppm or less, and a lithium secondary battery using the same.

A non-aqueous secondary battery contains a positive electrode, a negative electrode, a separator and a non-aqueous electrolytic solution. The positive electrode contains a layered structure lithium-containing compound oxide, or a spinel lithium-containing compound oxide containing manganese as an active material. The non-aqueous electrolytic solution contains at least one additive selected from a sulfonic acid anhydride, a sulfonate ester derivative, a cyclic sulfate derivative and a cyclic sulfonate ester derivative, and a vinylene carbonate or a derivative of the vinylene carbonate.

A nonaqueous electrolyte secondary battery, comprising a positive electrode containing a transition metal-containing composite oxide as a positive electrode active material, a negative electrode containing a negative electrode active material allowing reversible insertion and extraction of lithium, a separator, and a nonaqueous electrolyte solution, wherein the nonaqueous electrolyte solution contains at least one additive (A) selected from the group consisting of ethylene sulfite, propylene sulfite, and propane sultone and at least one additive (B) selected from the group consisting of maleic anhydride, vinylene carbonate, vinylethylene carbonate, and LiBF4; and an end voltage of charge is 4.3 to 4.5 V.

The present invention provides a cathode having a protection layer formed by a complex between the surface of a cathode active material and an aliphatic nitrile compound, as well as an electrochemical device comprising the cathode. Also, the present invention provides an electrochemical device comprising: (1) a cathode having a protection layer formed by a complex between the surface of a cathode active material and an aliphatic nitrile compound; (2) an anode having a passivation layer formed by a compound selected from the group consisting of vinylene carbonate, its derivative and an ether compound; and (3) an electrolyte solution containing a lithium salt and a solvent.

A rechargeable lithium battery including a positive electrode, a negative electrode and a nonaqueous electrolyte, said positive or negative electrode being an electrode which has, on a current collector, a thin film of active material that stores and releases lithium, the thin film of active material being divided into columns by gaps formed therein in a manner to extend in its thickness direction, and the columnar portions being at their bottoms adhered to the current collector, the rechargeable lithium battery being characterized in that the nonaqueous electrolyte includes a mixed solvent consisting of two or more different solvents and containing at least ethylene carbonate and / or vinylene carbonate as its constituent.

The invention discloses a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a solvent, lithium salt and a film forming additive, wherein the solvent comprises a first solvent and a second solvent; the first solvent comprises linear carboxylic ester and ethylene carbonate; the second solvent is one or more of ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate and propylene carbonate; and the film forming additive is one or more of fluoroethylene carbonate, vinylene carbonate, 1,3-propane suhone, succinonitrile, adiponitrile, lithium bis(oxalato)borate, and lithium oxalyldifluoroborate. Due to the collocation of linear carboxylic ester and ethylene carbonate, a solvent system with a higher dielectric constant and low viscosity is obtained; the film forming additive improves poor compatibility between linear carboxylic ester and graphite; and finally the lithium-ion secondary battery adopting the electrolyte presents high-power discharge capacity, excellent high-temperature cycling stability and low-temperature charge and discharge properties.

An object of the invention is to provide such a battery that has a high capacity, is excellent in storage characteristics, cycle characteristics and continuous charging characteristics, and is small in gas generation amount, whereby size reduction and improvement in performance of a lithium secondary battery can be attained. The present invention relates to a nonaqueous electrolytic solution comprising a lithium salt and a nonaqueous solvent dissolving the same, wherein the electrolytic solution contains, as the lithium salt, LiPF6 in a concentration of from 0.2 to 2 mole / L, and LiBF4 and / or a compound represented by the following formula (1) in a molar ratio of from 0.005 to 0.4 with respect to LiPF6, and the nonaqueous solvent mainly comprises (1) ethylene carbonate and / or propylene carbonate, (2-1) a symmetric linear carbonate, (2-2) an asymmetric linear carbonate, and (3) vinylene carbonate.

The invention discloses power lithium ion battery electrolyte and a power lithium ion battery. The power lithium ion battery electrolyte is prepared from a non-aqueous organic solvent, lithium salt, an additive A and an additive B, wherein the additive A is selected from at least one of difluoro lithium phosphate, difluoro sulfimide lithium and lithium difluoroborate, and the additive B is selected from at least one sulfide which has a first structural formula or a second structural formula or a third structural formula. According to the power lithium ion battery electrolyte, the additive A or the additive B with low impedance is blended, meanwhile, the dosages of high-impedance additives including vinylene carbonate, 1,3-propane sultone and the like are controlled, and an SEI (Solid Electrolyte Interface) membrane with low impendence and a stable structure can be formed on the surface of an electrode; the prepared power lithium ion battery has the advantages of long cycle life, high energy density, high output power, good low-temperature performance and the like.

The invention provides a power battery and a lithium ion electrolyte thereof. The lithium ion electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, wherein the additive comprises a first additive and a second additive, and the first additive comprises silane sulfate; the first additive accounts for 0.05 to 10% of the total weight of the electrolyte, and the second additive is an auxiliary additive and comprises one or more of vinylene carbonate, propane sultone, fluoroethylene carbonate, vinyl ethylene carbonate, ethylene sulfite, adiponitrile, and succinic anhydride in any proportion; the second additive accounts for 0.1-5wt% of the total weight of the electrolyte, and the non-aqueous organic solvent is a carbonic ester solvent, a carboxylic ester solvent, an ether solvent or a ketone solvent; and the lithium salt comprises primary lithium salt and secondary lithium salt.

An object of the invention is to provide such a battery that has a high capacity, is excellent in storage characteristics, cycle characteristics and continuous charging characteristics, and is small in gas generation amount, whereby size reduction and improvement in performance of a lithium secondary battery can be attained.The present invention relates to a nonaqueous electrolytic solution comprising a lithium salt and a nonaqueous solvent dissolving the same, wherein the electrolytic solution contains, as the lithium salt, LiPF6 in a concentration of from 0.2 to 2 mole / L, and LiBF4 and / or a compound represented by the following formula (1) in a molar ratio of from 0.005 to 0.4 with respect to LiPF6, and the nonaqueous solvent mainly comprises (1) ethylene carbonate and / or propylene carbonate, (2-1) a symmetric linear carbonate, (2-2) an asymmetric linear carbonate, and (3) vinylene carbonate.

A rechargeable lithium-air battery (10) comprises a non-aqueous, organic-solvent-based electrolyte (16) including a lithium salt and an additive containing an alkylene group, disposed between a spaced-apart pair of a lithium anode (12) and an air cathode (14). The alkylene additive may be alkylene carbonate, alkylene siloxane, or a combination of alkylene carbonate and alkylene siloxane. The alkylene carbonate may be vinylene carbonate, butylene carbonate, or a combination of vinylene carbonate and butylene carbonate. The alkylene siloxane may be a polymerizable silane. The polymerizable silane is triacetoxyvinylsilane.

Nonaqueous electrolytic liquids for lithium secondary batteries which have flame retardancy (self-extinguishing characteristics) or incombustibility (no flash point), have a high conductivity, and are electrochemically stable. One of the nonaqueous electrolytic liquids comprises a nonaqueous solvent comprising as an essential ingredient at least one phosphate (a) selected among chain phosphoric esters (a1) and cyclic phosphoric esters (a2). The nonaqueous solvent may further contain a cyclic carboxylic ester (b1) and a cyclic carbonic ester (b2). Another nonaqueous electrolytic liquid comprises the nonaqueous solvent and incorporated therein at least either a vinylene carbonate compound (c1) or a vinylethylene carbonate compound (c2) and one or more compounds selected from the group consisting of cyclic amide compounds (d1), cyclic carbamate compounds (d2), and cyclic hetero-compounds (d3).

An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent; a lithium salt; and an additive including vinylene carbonate, fluoroethylene carbonate, and a nitrile-based compound represented by Formula 1:wherein n ranges from 1 to 12 and R1 and R2 are independently a halogen, a hydrogen, or an alkyl group. Further, the alkyl group can be CmH(2m+1), in which m ranges from 1 to 10. The electrolyte for a rechargeable lithium battery improves storage stability of the rechargeable lithium battery at a high temperature. And, a rechargeable lithium battery including the electrolyte has improved storage stability.

The invention provides a preparation method of a semi-interpenetrating network polymer gel electrolyte membrane. The method comprises the following steps: (A) adding a linear polymer and a solvent to a sample bottle, stirring and dissolving the linear polymer and the solvent, adding polyethylene glycol dimethyl acrylic ester, vinylene carbonate and a photoinitiator, and mixing the polyethylene glycol dimethyl acrylic ester, the vinylene carbonate and the photoinitiator evenly to form a solution; (B) coating a glass plate with the solution, covering a layer of glass plate to form a sandwich structure, and curing the sandwich structure to obtain an ultraviolet-cured semi-interpenetrating network polymer membrane; and (C) immersing the ultraviolet-cured semi-interpenetrating network polymer membrane into liquid electrolyte. According to the gel electrolyte provided by the invention, the balance between the ionic conductivity and the mechanical property is relatively well realized; the ionic conductivity at room temperature can be up to 1.49*10<-3>S cm<-1>; the mechanical property is good; the heat stability is good; the electrolyte can be prevented from leaking; the interface stability is good; and a lithium iron phosphate / metal lithium battery assembled by the gel polymer electrolyte membrane has excellent cycle performance and rate performance.

The present invention relates to additives for electrolytes of lithium ion secondary batteries that include one or more of the following: 1,3-propane sultone, succinic anhydride; ethenyl sulfonyl benzene, and halobenzene. It can also include biphenyl, cyclohexylbenzene; and vinylene carbonate. The weight of said 1,3-propane sultone is between 0.5 wt. % and 96.4 wt. %, said succinic anhydride is between 0.5 wt. % and 96.4 wt. %; said ethenyl sulfonyl benzene is between 0.5 wt. % and 95.2 wt. %; and said halobenzene is between 0.5 wt. % and 95.2 wt. % of the weight of the additive. Batteries with electrolytes containing said additives have improved over-charge characteristics and low temperature properties, and reduced gas generation during charging and discharging.

Provided are a non-aqueous electrolyte solution which includes a lithium salt including lithium bis(fluorosulfonyl)imide (LiFSI) and an additive including a vinylene carbonate-based compound and a sultone-based compound, and a lithium secondary battery including the non-aqueous electrolyte solution. The lithium secondary battery including the non-aqueous electrolyte solution of the present invention may improve low-temperature output characteristics, high-temperature cycle characteristics, output characteristics after high-temperature storage, and capacity characteristics.

The present invention claims the addition of vinylene carbonate (VC) and optionally also fluoroethylene carbonate to the electrolyte of lithium ion cells having a structural silicon composite anode, i.e. an anode containing fibres or particles of silicon. The additive significantly improves the cycling performance of the cells. A VC content in the range 3.5-8 wt % based on the weight of the electrolyte has been found to be optimum.

Using a non-aqueous electrolyte secondary battery containing lithium iron phosphate as a positive electrode active material and graphite as a negative electrode active material, a low-cost, high energy density battery is provided that exhibits good performance at high rate current and good cycle performance even at high temperature. The non-aqueous electrolyte secondary battery has a positive electrode having a positive electrode current collector and a positive electrode active material-containing layer formed on a surface of the positive electrode current collector, the positive electrode active material-containing layer containing a conductive agent and a positive electrode active material including lithium iron phosphate, a negative electrode containing a carbon material, and a non-aqueous electrolyte. The non-aqueous electrolyte contains vinylene carbonate.

The present invention claims the addition of vinylene carbonate (VC) and optionally also fluoroethylene carbonate to the electrolyte of lithium ion cells having a structural silicon composite anode, i.e. an anode containing fibers or particles of silicon. The additive significantly improves the cycling performance of the cells. A VC content in the range 3.5-8 wt % based on the weight of the electrolyte has been found to be optimum.

The invention discloses a vinylene carbonate-based lithium ion battery polymer electrolyte and a preparation method as well as application thereof in a room-temperature full-solid lithium ion battery. The vinylene carbonate-based lithium ion battery polymer electrolyte comprises vinylene carbonate or a copolymer of vinylene carbonate, lithium salt, a porous backing material and an additive, wherein the molecular weight of a vinylene carbonate-based polymer is 172-1*10<7> Da; the ionic conductivity of the vinylene carbonate-based polymer electrolyte is 1*10<-3>-1*10<-5>S / cm at 25 DEG C; the initial decomposition voltage range is 4.5-5.2 V vs.Li<+> / Li. The vinylene carbonate-based electrolyte is prepared by the in-situ polymerization method, so that the electrolyte has excellent interfacial compatibility with electrodes. The vinylene carbonate-based polymer electrolyte can be used in the room-temperature full-solid lithium ion battery; the vinylene carbonate-based polymer electrolyte is excellent in electrochemical oxidation reduction stability, and can be used in high voltage resistant polymer electrolyte materials. The invention further provides the preparation method of the vinylene carbonate-based lithium ion battery polymer electrolyte, and a lithium ion battery made of the electrolyte.

Charge-discharge characteristics are improved in a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte containing a phosphoric ester compound as a solvent. In a non-aqueous electrolyte for secondary batteries containing a phosphoric ester compound, a lithium salt having an oxalato complex as an anion is contained as a solute. Preferably, the non-aqueous electrolyte contains lithium bis(oxalato)borate at a concentration of 0.01 to 0.2 mol / L with respect to the solvent, and more preferably, the non-aqueous electrolyte also contains vinylene carbonate.

The invention discloses a polymer electrolyte based on vinylene carbonate and polyethylene (methyl) acrylate and a preparation method of the polymer electrolyte. The electrolyte is characterized in that a lithium salt is dispersed in a solid-state polymer matrix, the content of the lithium salt in the solid-state polymer matrix accounts for 5-50wt%, and the solid-state polymer matrix is a copolymer of the vinylene carbonate and the polyethylene (methyl) acrylate or a copolymer of the vinylene carbonate, the polyethylene (methyl) acrylate and a framework monomer. The solid-state polymer electrolyte is simple to prepare, is high in room-temperature conductivity and can be used as an electrolyte of a lithium ion battery.

The present invention provides a method for producing a lithium-ion secondary battery with excellent high-temperature storage characteristics. The method for producing the lithium-ion secondary battery provided by the present invention includes a step of assembling a lithium-ion secondary battery using positive and negative electrodes, and a nonaqueous electrolyte containing in an organic solvent a lithium salt as a supporting salt, at least one type of substance selected from carboxylic acid anhydrides and dicarboxylic acids as additive A, and at least one type of substance selected from vinylene carbonate, vinylethylene carbonate, ethylene sulfite, and fluoroethylene carbonate as additive B; a step of carrying out initial charging of the assembled battery to a predetermined voltage; and a step of carrying out an aging treatment by keeping the battery at a temperature of 35° C. or higher for 6 hours or longer.

The invention provides a lithium ion battery electrolyte and a high-energy-density lithium ion battery using the same. The lithium ion battery electrolyte comprises a non-aqueous organic solvent, a lithium salt and additives. The additives comprise a negative electrode film-forming additive, a nitrile or ether nitrile compound, an acid anhydride compound and a lithium salt type additive. Accordingto the lithium ion battery electrolyte, 0.3-20wt% of the negative electrode film-forming additive such as vinylene carbonate and / or fluorocarbonate can form an excellent SEI film on a carbon-containing negative electrode, a silicon-containing negative electrode or a silicon carbon alloy negative electrode and the like, thereby stabilizing the negative electrode and ensuring excellent battery performance; 0.2-6.5wt% of the nitrile or ether nitrile compound, the acid anhydride compound and a combination of them can complex metal ions of a positive electrode or form a protective film on the surface of the positive electrode, thereby stabilizing the positive electrode and improving battery performance; and the 0.5-3 wt% of the lithium salt type additive in the lithium ion battery electrolytecan lower the impedance of the battery so as to improve the low temperature performance of the battery or improve the high temperature performance of the battery.

The preservation performance of a nonaqueous electrolyte secondary cell charged to high potential is improved while the initial capacity and the cycle property of the cell are also improved. The nonaqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material containing lithium cobalt compound oxide and lithium manganese nickel compound oxide having a layer structure, the lithium cobalt compound oxide having at least zirconium and magnesium added in LiCoO2; a negative electrode having a negative electrode active material; and a nonaqueous electrolyte having a nonaqueous solvent and an electrolytic salt. The potential of the positive electrode is more than 4.3 V and 5.1 V or less based on lithium. The nonaqueous electrolyte contains vinylene carbonate as the nonaqueous solvent and, as the electrolytic salt, at least one of lithium bis(pentafluoroethane sulfonyl)imide and lithium bis(trifluoromethane sulfonyl)imide at 0.1 M or more and 0.5 M or less. The nonaqueous electrolyte contains 1,3-dioxane.

Provided is an electrolyte solution additive including lithium difluorophosphate (LiDFP), a vinylene carbonate-based compound, and a sultone-based compound. Also, a non-aqueous electrolyte solution including the electrolyte solution additive and a lithium secondary battery including the non-aqueous electrolyte solution are provided. The lithium secondary battery including the electrolyte solution additive of the present invention may improve low-temperature output characteristics, high-temperature cycle characteristics, output characteristics after high-temperature storage, and swelling characteristics.

The invention provides a lithium ion secondary cell, in particular a long-life fast-charging cell. The long-life fast-charging cell comprises a positive electrode material, a negative electrode material, a diaphragm and a nonaqueous electrolyte, wherein the active substance of the negative electrode material comprises at least one of hard carbon and soft carbon; the nonaqueous electrolyte contains a film-forming additive and a lithium salt; the film-forming additive comprises vinylene carbonate; and the lithium salt comprises lithium difluorosulfonylimide. Due to excellent performance, the long-life fast-charging cell has broad market prospects.

A rechargeable lithium battery including a positive electrode, a negative electrode and a nonaqueous electrolyte, said positive or negative electrode being an electrode which has, on a current collector, a thin film of active material that stores and releases lithium, the thin film of active material being divided into columns by gaps formed therein in a manner to extend in its thickness direction, and the columnar portions being at their bottoms adhered to the current collector, the rechargeable lithium battery being characterized in that the nonaqueous electrolyte includes a mixed solvent consisting of two or more different solvents and containing at least ethylene carbonate and / or vinylene carbonate as its constituent.

The invention discloses a lithium battery electrode preparation method including polymer material with a stable interface and the application of a lithium battery electrode in a solid lithium battery. The preparation method is characterized in that the polymer material with the stable interface is poly-vinylene carbonate (PVCA) or copolymers thereof. The free radical triggers the monomer to perform mass polymerization to obtain a polymer, the polymer material with the stable interface can form a cover film on the surface of the electrode, thus destruction on the electrode material and decomposition of the solid electrolyte on the surfaces of the positive and negative electrodes can be effectively restrained. Meanwhile, the polymer material can form a stable protection layer on the surface of lithium metal to inhibit the growth of the lithium dendrites, thus the cycle performance of the solid lithium battery is improved. The invention also provides a preparation method of the electrochemical stable polymer material, and the solid lithium battery assembled by using the polymer material.