509results about How to "Improve lithium ion conductivity" patented technology

There are provided glass-ceramics having a high lithium ion conductivity which include in mol %:

and contain Li_1+X(Al, Ga)_XTi_2−X(PO₄)₃ (where 0<X<0.8) as a main crystal phases. There are also provided glass-ceramics having a high lithium ion conductivity which include in mol %:

and contain Li_1+X+YM_XTi_2−XSi_YP_3−YO₁₂ (where 0<X≦0.4 and 0<Y≦0.6) as a main crystal phase. There are also provided solid electrolytes for an electric cell and a gas sensor using alkali ion conductive glass-ceramics, and a solid electric cell and a gas sensor using alkali ion conductive glass-ceramics as a solid electrolyte.

Disclosed is a material which enhances stability for lithium in all the batteries, which use the lithium metal as an electrode material, by using and applying a lithium-substituted perfluoro sulfonic acid (PFSA) material in the form of a membrane or a powder to a lithium anode. Methods of manufacturing the material are also enclosed.

A lithium ion-conducting compound, having a garnet-like crystal structure, and having the general formula: Li_n[A_{(3-a′-a″)}A′_(a′)A″_(a″)][B_{(2-b′-b″)}B′_(b′)B″_(b″)][C′_(c′)C″_(c″)]O₁₂, where A, A′, A″ stand for a dodecahedral position of the crystal structure, where A stands for La, Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and/or Yb, A′ stands for Ca, Sr and/or Ba, A″ stands for Na and/or K, 0<a′<2 and 0<a″<1, where B, B′, B″ stand for an octahedral position of the crystal structure, where B stands for Zr, Hf and/or Sn, B′ stands for Ta, Nb, Sb and/or Bi, B″ stands for at least one element selected from the group including Te, W and Mo, 0<b′<2 and 0<b″<2, where C and C″ stand for a tetrahedral position of the crystal structure, where C stands for Al and Ga, C″ stands for Si and/or Ge, 0<c′<0.5 and 0<c″<0.4, and where n=7+a′+2·a″−b′−2·b″−3·c′−4·c″ and 5.5<n<6.875.

Provided is anode active material layer for a lithium battery, comprising multiple particulates of an anode active material, wherein a particulate is composed of one or a plurality of particles of a high-capacity anode active material being embraced or encapsulated by a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 10% when measured without an additive or reinforcement, a lithium ion conductivity no less than 10^-5 S/cm at room temperature, and a thickness from 0.5 nm (or a molecular monolayer) to 10 μm (preferably less than 100 nm), and wherein the high-capacity anode active material has a specific lithium storage capacity greater than 372 mAh/g (e.g. Si, Ge, Sn, SnO₂, Co₃O₄, etc.).

Provided is particulate of an anode active material for a lithium battery, comprising one or a plurality of anode active material particles being embraced or encapsulated by a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 5%, a lithium ion conductivity no less than 10⁻⁶ S/cm at room temperature, and a thickness from 0.5 nm to 10 μm, wherein the polymer contains an ultrahigh molecular weight (UHMW) polymer having a molecular weight from 0.5×10⁶ to 9×10⁶ grams/mole. The UHMW polymer is preferably selected from polyacrylonitrile, polyethylene oxide, polypropylene oxide, polyethylene glycol, polyvinyl alcohol, polyacrylamide, poly(methyl methacrylate), poly(methyl ether acrylate), a copolymer thereof, a sulfonated derivative thereof, a chemical derivative thereof, or a combination thereof.

Provided is a lithium secondary battery, comprising a cathode, an anode, and a porous separator or electrolyte disposed between the cathode and the anode, wherein the anode comprises: (a) an anode active layer containing a layer of lithium or lithium alloy, in a form of a foil, coating, or multiple particles aggregated together, as an anode active material; and (b) a thin layer of a high-elasticity polymer, disposed between the anode active layer and the porous separator or electrolyte; the polymer having a recoverable tensile strain from 2% to 1,500%, a lithium ion conductivity no less than 10⁻⁶ S/cm (typically up to 5×10⁻² S/cm) at room temperature, and a thickness from 1 nm to 10 μm, wherein the high-elasticity polymer contains a polyrotaxane network having a rotaxane structure or a polyrotaxane structure at a crosslink point of the polyrotaxane network.

The present invention discloses a all-solid lithium secondary battery that has large chare and discharge output current denseness and excellent charge and discharge cycle life which can be easily manufactured at low cost. In the manufacturing process of the all-solid lithium secondary battery, a new lithium ion conductor with ionic conduction improved can be obtained through vitrification to mixed electrolytes by mixing Alpha-oxide of alumina in various sulfide system lithium ion conductivity solid electrolyte. The electrolytes layer 8 used the lithium ion conductor, and positive and negative electrode (I), (II) are formed by positive and negative electrode material 3, 7 are constituted. Subsequently, cascading at least 1 layer in positive and negative electrode (I), (II) with electrolytes layer, and producing battery while electrolytes not crystallizes by heating and compressing as a whole.

Provided are: a non-aqueous electrolyte solution for a secondary battery that exhibits both excellent low-temperature discharge characteristics and excellent cycle characteristics on a long-term basis; and a secondary battery.

A non-aqueous electrolyte solution for a non-aqueous electrolyte secondary battery that has a positive electrode and a negative electrode capable of the absorbing and releasing of a metal ion, and a separator,

• • the non-aqueous electrolyte solution comprising, in addition to an electrolyte and a non-aqueous solvent, 0.01 mass % or more to less than 3 mass % of a compound having one or more partial structure represented by the following general formula (1) and two or more isocyanate groups in the molecule:

(In the general formula (1), R represents hydrogen or a C₁-C₁₂ organic group that may contain an isocyanate group and is constituted of atoms selected from the group consisting of hydrogen atom, carbon atom, nitrogen atom, oxygen atom, sulfur atom, phosphorus atom, and halogen atom).

Provided is a lithium secondary battery, comprising a cathode, an anode, and a porous separator or electrolyte disposed between the cathode and the anode, wherein the anode comprises: (a) an anode active layer containing a layer of lithium or lithium alloy, in a form of a foil, coating, or multiple particles aggregated together, as an anode active material; and (b) an anode-protecting layer of a conductive sulfonated elastomer composite, disposed between the anode active layer and the separator/electrolyte; wherein the composite has from 0.01% to 50% by weight of a conductive reinforcement material dispersed in a sulfonated elastomeric matrix material and the protecting layer has a thickness from 1 nm to 100 μm, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10⁻⁷ S/cm to 5×10⁻² S/cm, and an electrical conductivity from 10⁻⁷ S/cm to 100 S/cm.

Provided is an anode active material layer for a lithium battery. This layer comprises multiple particulates of an anode active material, wherein at least a particulate is composed of one or a plurality of particles of a high-capacity anode active material being encapsulated by a thin layer of elastomeric material that has a lithium ion conductivity no less than 10⁻⁷ S/cm (preferably no less than 10⁻⁵ S/cm) at room temperature and an encapsulating shell thickness from 1 nm to 10 μm, and wherein the high-capacity anode active material (e.g. Si, Ge, Sn, SnO₂, Co₃O₄, etc.) has a specific capacity of lithium storage greater than 372 mAh/g (the theoretical lithium storage limit of graphite).

The invention discloses a method for preparing a high-performance lithium phosphate/carbon-coated lithium iron phosphate composite material. The method mainly comprises the processes of preparing lithium iron phosphate not subjected to carbon coating and preparing the lithium phosphate/carbon-coated lithium iron phosphate composite material. The method comprises the following steps: performing primary sintering to prepare lithium iron phosphate not subjected to carbon coating, and adding a certain amount of lithium phosphate and carbon source in the secondary mixing process to finally prepare the lithium phosphate/carbon-coated lithium iron phosphate composite material. The lithium phosphate is a fast ionic conductor, the aim of improving the electrical conductivity of lithium iron phosphate is achieved, and the aim of improving the overall performance of the lithium iron phosphate is also achieved.

Provided is a solid state electrolyte for a rechargeable lithium battery, comprising a lithium ion-conducting polymer matrix or binder and a lithium ion-conducting inorganic species dispersed in or chemically bonded by the polymer matrix or binder, wherein the lithium ion-conducting inorganic species is selected from a mixture of a sodium-conducting species or sodium salt and a lithium-conducting species or lithium salt selected from Li₂CO₃, Li₂O, Li₂C₂O₄, LiOH, LiX, ROCO₂Li, HCOLi, ROLi, (ROCO₂Li)₂, (CH₂OCO₂Li)₂, Li₂S, Li_xSO_y, or a combination thereof, wherein X=F, Cl, I, or Br, R=a hydrocarbon group, x=0-1, y=1-4; and wherein the polymer matrix or binder is in an amount from 1% to 99% by volume of the electrolyte composition. Also provided are a process for producing this solid state electrolyte and a lithium secondary battery containing such a solid state electrolyte.

A non-aqueous electrolyte secondary battery has a positive electrode (11) containing a positive electrode active material, a negative electrode (12) containing a negative electrode active material, and a non-aqueous electrolyte solution (14) in which a solute is dissolved in a non-aqueous solvent. The positive electrode active material is obtained by sintering a titanium-containing oxide on a surface of a layered lithium-containing transition metal oxide represented by the general formula Li_1+xNi_aMn_bCo_cO_2+d, where x, a, b, c, and d satisfy the conditions x+a+b+c=1, 0.7≦a+b, 0≦x≦0.1, 0≦c/(a+b)<0.35, 0.7≦a/b≦2.0, and −0.1≦d≦0.1.

The invention discloses an organic/inorganic composite electrolyte and a preparation method thereof. The organic/inorganic composite electrolyte is obtained by dispersing a lithium salt and a modified inorganic solid electrolyte into a polymer in a mixing manner, wherein the polymer contains an ethylene oxide repeating unit. The modification of the inorganic solid electrolyte is carried out for the first time; a polymer electrolyte and the inorganic electrolyte are effectively and evenly composited, so that the organic/inorganic composite electrolyte material is obtained. The dispersion of the inorganic solid electrolyte in the polymer is improved by the modification of the inorganic solid electrolyte, so that the adverse effect that the inorganic solid electrolyte is automatically gathered is avoided. The organic/inorganic composite electrolyte material obtained according to the preparation method has the advantages of the polymer electrolyte and the inorganic electrolyte, so that the comprehensive performance of the organic/inorganic composite electrolyte material is obviously improved. The organic/inorganic composite electrolyte material has practical value and can be popularized in lithium ion secondary batteries.

The invention relates to a three-layer core-shell structure positive electrode material. The three-layer core-shell structure positive electrode material comprises a three-layer structure, namely, a ternary positive electrode material inner core, an aluminum oxide layer and a rapid ion conductor layer, wherein the aluminum oxide layer wraps the ternary positive electrode material inner core, and the rapid ion conductor layer wraps the aluminum oxide layer. The invention also comprises a preparation method of the three-layer core-shell structure positive electrode material. Since the rapid ionconductor wrapping an outer layer of the three-layer core-shell structure positive electrode material has super strong ionic conductivity, the integral ionic conductivity of the Al2O3-coated positiveelectrode material can be improved, the electric energy loss is reduced, and the cycle property of a battery is improved; moreover, the aluminum oxide layer and the ternary positive electrode materialinner core form a Li-Al-Co-O co-melting body by high-temperature calcination during the preparation process, the ionic conductivity of the material can be further improved, and the electrical conductivity and the microstructure stability of the composite material are improved; and by the three-layer core-shell structure, the corrosion of an electrolyte to the ternary positive electrode material inner core can be reduced, and the battery safety is improved.