495results about How to "Good capacity retention" patented technology

An electrode according to the invention can provide a non-aqueous electrolyte secondary battery having an ability to release a volume expansion at the time of charge and discharge as well as the time of a cycle. The electrode comprises a current collector made of a material which is not alloyed with Li, and a dot pattern 2 of a metallic material able to be alloyed with Li formed on the current collector. At the time of charge, since the volume expansion of each dot 3 is carried out so as to bury adjoining crevices 4 between the dots, a stress generated is released, thereby degradation of an electrode being avoided. Each dot may also be made into porosity.

An object of the invention is to provide a nonaqueous electrolytic solution which is capable of bringing about a nonaqueous-electrolyte secondary battery improved in initial charge capacity, input/output characteristics, and impedance characteristics. The invention relates to a nonaqueous electrolytic solution which comprises: a nonaqueous solvent; LiPF₆; and a specific fluorosulfonic acid salt, and to a nonaqueous-electrolyte secondary battery containing the nonaqueous electrolytic solution.

Negative active materials including metal nanocrystal composites comprising metal nanocrystals having an average particle diameter of about 20 nm or less and a carbon coating layer are provided. The negative active material includes metal nanocrystals coated by a carbon layer, which decreases the absolute value of the change in volume during charge/discharge and decreases the formation of cracks in the negative active material resulting from a difference in the volume change rate during charge/discharge between metal and carbon. Therefore, high charge/discharge capacities and improved capacity retention capabilities can be obtained.

The invention discloses a modified spinel lithium manganate material used in anode material of lithium secondary battery, the lithium manganate is a kind of doped lithium manganate LiaMn2-bXbO4 with other metallic element X, wherein X is at least one element of chroumium, gallium, magnesium, titanium, cuprum, zincum, 0.97 <= a <= 1.07, 0 <= b <= 0.1; and the surface of the said doped lithium manganate LiaMn2-bXbO4 is provided with a coat which contains at least one kind of boron-lithium composite oxides, cobalt-lithium composite oxides, vanadium-lithium composite oxides or carbon layer. The invention also discloses a preparing method for the said material and the lithium secondary battery using the said material as anode material. The invention provided modified spinel lithium manganate material has relative good high rate deep discharge capacity in normal temperature or high temperature, in mean time, the preparing method is easy for control and operation and industrialisation, and production cost thereof is low.

A non-aqueous electrolyte to be used in a Li-ion battery includes a lithium salt, a cyclic carbonate, a linear carbonate and an alkyl fluorinated phosphate, of the following general formula

wherein R¹, R² and R³, independently, are selected from the group consisting of straight and branched alkyl groups having 1-5 carbon atoms, and at least one of said alkyl groups is fluorinated, with the locations of said fluorination being at least β-positioned away from the phosphorous of said phosphate, such that said alkyl phosphate has a F/H ratio of at least 0.25, and said electrolyte solution is non-flammable.

Disclosed are a current collector for a flexible electrode, a method of manufacturing the same, and a negative electrode including the same. The current collector for a flexible electrode includes: a flexible polymer substrate; a cross-linkable polymer layer disposed on the polymer substrate; and a metal layer disposed on the cross-linkable polymer layer, wherein the surface of the cross-linkable polymer layer includes a plurality of protrusions and grooves.

The invention discloses a dopamine-modifying ceramic composite separator and an application thereof. The dopamine-modifying ceramic composite separator comprises an organic separator base material and a ceramic layer arranged on the surface of the separator base material in a coated mode, wherein the thickness of the ceramic layer ranges from 0.1 micrometer to 20 micrometers. The dopamine-modifying ceramic composite separator further comprises dopamine polymers grown on the surfaces and the interiors of the separator base material and the ceramic layer in an in-situ mode. The dopamine polymers are copolymers of polydopamine or 5-hydroxy- polydopamine or polydopamine acrylamide and polydopamine acrylamide. The particle size of inorganic powder in the ceramic layer ranges from 5 nanometers to 10 micrometers. The molecular weight of materials of the organic separator base material ranges from 1,000 to 100,000,000. According to the dopamine-modifying ceramic composite separator, due to the dopamine polymers, potential safety hazards caused by powder falling and liquid leaking of the ceramic layer can be effectively reduced, and the physical performance and the electrochemical performance of the separator are effectively improved; meanwhile, due to the dopamine polymers, the stability of an interface between separator electrolysis and an electrode can be improved, lithium dendrites can be effectively suppressed through the improvement of the stability of the interface, and therefore the capacity holding capacity of a battery can be easily improved.

A battery includes a cathode, an anode, and an aqueous electrolyte disposed between the cathode and the anode and including a cation A. At least one of the cathode and the anode includes an electrode material having an open framework crystal structure into which the cation A is reversibly inserted during operation of the battery. The battery has a reference specific capacity when cycled at a reference rate, and at least 75% of the reference specific capacity is retained when the battery is cycled at 10 times the reference rate.

The present invention provides a negative electrode material for a lithium ion secondary battery, a composite negative electrode material for a lithium ion secondary battery, a resin composition for a lithium ion secondary battery negative electrode, and a negative electrode for a lithium ion secondary electrode, which may provide high charge/discharge capacity, and excellent initial charge-discharge characteristics and capacity retention. The surfaces of core particles of silicon of 5 nm or more and 100 nm or less in average particle size are coated with a coating layer to use a negative electrode material containing substantially no silicon oxide in the coating layer, or a composite negative electrode material for a lithium ion secondary battery, which includes the negative electrode material and a matrix material, further with the use of a polyimide resin or a precursor thereof as a bonding resin, thereby making it possible to achieve high charge/discharge capacity and excellent capacity retention, as well as high initial efficiency.

An anode of a lithium battery includes a composite film, the composite film comprising a carbon nanotube film structure and a plurality of nanoscale tin oxide particles dispersed therein. A method for fabricating an anode of a lithium battery, the method includes the steps of: (a) providing an array of carbon nanotubes; (b) pulling out, by using a tool, at least two carbon nanotube films from the array of carbon nanotubes to form a carbon nanotube film structure; and (c) dispersing a plurality of nanoscale tin oxide particles in the carbon nanotube film structure to form a composite film, and thereby, achieving the anode of the lithium battery.

The invention discloses high voltage electrolyte considering high and low temperature performance and a lithium ion battery using the electrolyte. The high voltage electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt, an ether nitrile compound and a low impedance additive, wherein the non-aqueous organic solvent comprises a carbonate solvent and a linear carboxylic acid ester solvent with a wide liquid range; the electrolyte lithium salt is a combination of lithium hexafluorophate and lithium triflurosulfimide according to a molar ratio of 0.01-0.5; and the low impedance additive is a cyclic sulfate compound. The linear carboxylic acid ester solvent for perfecting the electrode/ electrolyte interface is contained in the high voltage electrolyte, by means of the optimized combination of the ether nitrile compound, the lithium triflurosulfimide and the cyclic sulfate compound and other additives, a high voltage battery can be guaranteed to have excellent circulation performance, and meanwhile, the excellent high and low temperature performance of the high voltage battery of storage for 18 h in a full charge state at 85 DEG C and no lithium separation in the full charge state at 0 DEG C is considered.

The invention discloses a high-temperature type lithium manganate anode material for a power lithium ion battery. The high-temperature type lithium manganate anode material consists of a core material as shown in a formula Li1+xMn2-y-zAyQzO4, and a coating layer on the surface of the core material, wherein the coating layer is one or more of cobaltosic oxide, aluminum oxide and nickel protoxide. The anode material is excellent in high-temperature property, and is good in specific discharge capacity, capacity retention ratio and electrochemical circulation property at high temperature. In addition, the preparation method of the anode material disclosed by the invention is simple in production process, easy to achieve and low in cost, and can be applied to large-scale industrialization production.

The invention relates to the technical field of magnesium batteries, and discloses preparation and application of a sulfur/sulfide/copper ternary composite cathode in a magnesium-sulfur battery. The sulfur/sulfide/copper ternary composite cathode comprises sublimation sulfur, metal sulfide and metal copper foil. Meanwhile, the magnesium-sulfur battery is assembled by the sulfur/sulfide/copper ternary composite cathode, a magnesium ion electrolyte and a metal magnesium anode. The composite cathode not only can effectively bind polysulfide ions to the cathode region, thus suppressing a 'shuttle effect', but also generate a non-stoichiometric copper sulfide (CuxS, x<=2) interphase by means of dissolution of the metal copper foil, thus promoting the electrochemical conversion reaction of a discharging product MgS, significantly improving the charge and discharge capacity of the battery and improving the cycling stability of the magnesium-sulfur battery.

The invention discloses a preparation method of a lithium ion battery anode material. The method is characterized in that the outer surface of the existing lithium ion battery anode material is sequentially coated with an aluminum oxide layer and a carbon layer, wherein the coating condition is liquid-phase coating, in the coating process of the aluminum oxide, the addition sequence of the existing lithium ion battery anode material and aluminum salt is adjusted, and the coating substance organic aluminum salt is added under the continuously stirring condition, so that a hydrolytic product is uniformly adsorbed onto the surface of an active substance. The carbon coating is carried out through a spray drying and rapid sintering way in the inert gas atmosphere, so that the problems that the metal is reduced due to the high-temperature carbon coating and the organic carbon source is difficultly carbonized in low temperature can be avoided. The invention also discloses a lithium ion battery anode material prepared through the method. The energy density and power density of the battery can be remarkably improved, and the cycling performance, the capacity retention rate and the safety performance of the battery can be improved.

The invention relates to a mixed matrix type cation exchange membrane and a preparation method thereof. The cation exchange membrane takes a sulfonated modified polymer material as a substrate and isdoped with Schiff base type covalent organic framework materials loaded with different functional groups. The preparation method comprises the following steps of: sequentially performing monomer preparation and polymerization of a covalent organic framework material, sulfonation modification of a polymer, uniform mixing of the covalent organic framework material and a sulfonated polymer, and flow-spreading film formation; and finally, performing acid treatment to obtain the cation exchange membrane. The covalent organic framework material can effectively improve the vanadium resistance of themembrane based on the rigid porous structure; the organic porous structure of the covalent organic framework and the different functional modifications can partially compensate the loss of membrane proton conductivity caused by the introduction of particles; the rigid framework can obviously inhibit the swelling in the membrane and can improve the tensile strength of the membrane; COFs is composedof organic structures and can promote compatibility between sulfonated polymers and covalent organic framework materials; and moreover, the polymer as the substrate can improve the film forming performance of the covalent organic framework material, so that the covalent organic framework material has the better mechanical strength.

The invention relates to an anode material of a lithium-sulfur battery, the lithium-sulfur battery and a method for preparing the anode material, and belongs to the field of battery materials. The center of the anode material is made of a functionalized carbon nano-material, the middle interlayer is made from sulfur, and the outer layer adopts a polydopamine film, wherein the functionalization method is hydroxylation or carboxylation. The preparation method comprises the following steps: dissolving the carbon nano-material in an alkaline or acid liquid to obtain the functionalized carbon nano-material; adding the functionalized carbon nano-material in a sulfur water solution, stirring, dropwise adding diluted acid to the solution, and obtaining the functionalized carbon nano-material coated with sulfur on the outer side; adding the functionalized carbon nano-material coated with sulfur on the outer side in a tris(hydroxymethyl) methane buffer solution, and performing a polymerization reaction to a dopamine hydrochloride solution, so as to obtain the anode material. The invention further relates to the lithium-sulfur battery using the anode material. The battery can further comprise a polyethylene diaphragm modified by polydopamine. The anode material can inhibit the shuttle flying effect and the structural damage caused by volume expansion; and the lithium-sulfur battery is good in cycle performance and capacity retention ratio.

A lithium-ion battery is provided and related methods. The lithium-ion battery includes an electrode comprising an Olivine flake-like structure and an electrode comprising a plurality of coated carbon nanofibers. The Olivine flake-like structures form clusters through which the lithium ions are transported while reducing initial cycle irreversibility. The electrode comprising the coated carbon nanofibers additionally reduce initial cycle irreversibility by controlling expansion of the substrate forming the electrode comprising the coated carbon nanofibers.

The invention relates to a high-nickel ternary lithium-ion positive electrode material and a preparation method thereof. The high-nickel ternary lithium-ion positive electrode material is niobium-doped LiNi0.8Co0.1Mn0.1O2, the chemical formula of the high-nickel ternary lithium-ion positive electrode material is Li(Ni0.8Co0.1Mn0.1)1-xNbxO2, wherein x is more than 0 and less than or equal to 2%. The preparation method comprises the following steps: mixing a nickel source, a cobalt source, a manganese source and a niobium source with urea, adding water and stirring till being dissolved for hydrothermal reaction; after reaction is ended, filtering and washing solution and precipitants in a reaction kettle, drying to obtain precursor, grinding the precursor into powder, mixing with an equimolar lithium source, mixing and grinding uniformly, carrying out high-temperature sintering on the mixed powder in an oxygen atmosphere, cooling to room temperature, and after grinding the powder, obtaining the high-nickel ternary lithium-ion positive electrode material. Compared with undoped materials, the high-nickel ternary lithium-ion positive electrode material shows better multiplying power andcycling performance.

The invention relates to a sodium doped lithium-rich manganese based cathode material for a lithium ion battery. The material is a sodium salt doped lithium-rich manganese based solid solution cathode material of which the general formula is xLi[Li1/3Mn2/3]O2.(1-x)LiNi0.2Co0.2Mn0.6O2, wherein x is equal to or greater than 0.4 and is equal to or less than 0.7, the doped quantity of sodium elements is 1-10% of the mol content of lithium elements, and the sodium salt is one selected from Na2CO3, Na2C2O4 and NaNO3. The mol content of ternary phase manganese of the sodium doped lithium-rich manganese based cathode material for the lithium ion battery is greater than 50%, and the manganese with high reserves and low price is used for replacing cobalt and nickel, so that the application cost can be reduced. Compared with the prior art, the sodium doping provided by the invention can improve the discharging specific capacity and the circulating stability of the rich lithium manganese based cathode material.