46results about How to "Improve lithium battery performance" patented technology

The present invention provides electrochemical cells providing good electronic performance at low temperatures. Electrochemical cells of the present invention include lithium batteries capable of providing useful specific capacities under significant discharge rates for temperatures as low as −60 degrees Celsius. The present invention also provides methods for making electrochemical cells including a room temperature predischarge step preceding low temperature operation that enhances the performance of batteries having subfluorinated carbonaceous positive electrode active materials at low temperatures.

The invention relates to the technical field of lithium battery slurry materials, in particular to a conductive carbon material dispersing agent which comprises one of modified polyvinyl alcohol, alkyl ammonium salt copolymer, olefin block maleic anhydride copolymer and pyrrolidone copolymer, or mixtures thereof, and can effectively disperse carbon nanotube, graphene and other conductive carbon materials in a solvent to obtain uniform conductive slurry; further disclosed is a high-conductivity slurry for the lithium battery, which comprises 0.5-15.0% by weight of a conductive carbon material and 0.1-3.0% by weight of a dispersing agent, and can remarkably reduce the bulk resistivity of a positive electrode system of the lithium battery and improve the conductivity of a pole piece.

A lithium battery and a method of preparing the lithium battery, wherein the lithium battery includes: a cathode layer including a cathode active material including a core, and an ion conductive phosphate coating layer on a surface of the core; an anode layer; and a solid electrolyte layer that is disposed between the cathode layer and the anode layer, wherein the solid electrolyte layer includes a sulfide solid electrolyte.

The invention provides a NiS@C nanocomposite material for a negative electrode of a battery and a preparation method of the NiS@C nanocomposite material. The preparation method comprises the following steps: with nickel chloride hexahydrate and thiourea as reactive raw materials, producing NiS by a solvothermal method, then coating the surface of the NiS with carbon by a hydrothermal method, and annealing at high temperature to obtain the NiS@C nanocomposite material. The surface of metal sulfide is coated with the carbon, so that the defects that the sulfide has poor cyclicity and stability can be effectively made up, the cyclicity and the stability of the material are improved, and the conductivity of the material can be improved. As a negative electrode material of a lithium-ion battery, the NiS@C nanocomposite material prepared with the preparation method provided by the invention has relatively good lithium battery performance, relatively high specific capacity and relatively good cycling performance.

The invention relates to a method for synthesizing an S and N synergistic mesoporous carbon material with excellent ORR and lithium-ion electric performance through a one-step method. The preparation method includes the following steps that 2-aminothiazole is used as the raw material, ZnCl2 is used as the solvent and catalyst, and the 2-aminothiazole and the ZnCl2 are placed into a tube furnace, so that the high-yield S and N co-doped mesoporous carbon material is obtained at different temperatures through the one-step method (SNPC-500, SNPC-600, SNPC-700 and SNPC-800 are obtained at the temperatures of 500 DEG C, 600 DEG C, 700 DEG C and 800 DEG C respectively). The specific surface area of the SNPC-800 reaches up to 1235 m<2>/g, the pore diameter ranges from 10 nm to 45 nm, and the S and N synergistic mesoporous carbon material has the ORR performance which compares favorably with the performance of Pt/C, high lithium-ion electric reversible capacity, excellent recycling stability and rate capability. The method is easy to operate, low in production cost, high in yield, wide in industrial prospect, and capable of bringing huge economic benefits and social benefits if being industrialized.

The invention discloses a porous silicon@amorphous carbon/carbon nanotube composite material, which has a core-shell structure, an inner core is a porous silicon material, an outer shell is an amorphous carbon layer, carbon nanotubes directly grow on the surface of the amorphous carbon layer, and adjacent carbon nanotubes are intertwined to form a conductive network. The preparation method comprises the following steps: mixing porous silicon with an electronegative group on the surface, soluble salt of Ni < 2 + >, a weakly alkaline substance and water to obtain a reaction solution, controllingthe pH value of the reaction solution to be weakly alkaline, and completely reacting to obtain an intermediate product A; carrying out heat treatment on the intermediate product A in a hydrogen-containing atmosphere, and carrying out reduction to obtain an intermediate product B; and carrying out chemical vapor deposition on the intermediate product B in an atmosphere containing carbon source gas, and carrying out post-treatment to obtain the porous silicon@amorphous carbon/carbon nanotube composite material. The porous silicon@amorphous carbon/carbon nanotube composite material has excellentcycling stability and can be used as a negative electrode material of a lithium ion battery.

The invention provides a Cu9S5@C nanocomposite material used for the negative electrode of a battery and a preparation method thereof. The preparation method comprises the following steps: with sulfur powder, copper acetate and ammonia water as reaction raw materials, carrying out a hydrothermal method so as to generate copper sulfide, carrying out annealing so as to obtain Cu9S5, coating glucose on the surface of Cu9S5 by utilizing the hydrothermal method, and carrying out annealing at a high temperature so as to obtain the Cu9S5@C nanocomposite material. According to the invention, carbon is coated on the surface of metal sulfide, so the disadvantages of poor cycle performance and stability of sulfide can be effectively compensated; cycle performance and stability of a material are improved; conductivity of the material can be increased; and the Cu9S5@C nanocomposite material used as an anode material of a lithium ion battery can effectively realize high capacity and good cycle stability and effectively improves performances of the battery. Testing results show that the lithium ion battery with the Cu9S5@C nanocomposite material prepared by using the preparation method provided by the invention as the negative electrode has good lithium-ion electric performance, stable specific capacity and good cycle performance, obtains the characteristic of fast-rising capacity after manifold cycles, and has the specific capacity increased to two times of the initial specific capacity after 90 cycles.

An oligomer and a lithium battery are provided. The oligomer is obtained by reacting a maleimide, a barbituric acid, and a promoter in a solvent. The promoter has the structure represented by formula 1:

X—(R)₃  formula 1,

• • wherein X is N or P; R is a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group. The lithium battery includes an anode, a cathode, a separator, an electrolyte solution, and a package structure, wherein the cathode includes the oligomer.

The invention discloses a method for synthesizing a silver indium sulfide heterojunction structure nano material through a hydro-thermal mode. The method comprises steps of dissolving an alcoholic suspension of silver nanowires in de-ionized water, stirring the alcoholic suspension, adding indium trichloride tetrahydrate crystal to the mixing liquid, conducting magetic stirring, adding a certain amount of surface active agent cetyl trimethyl ammonium bromide, stirring the surface active agent cetyl trimethyl ammonium bromide till the surface active agent cetyl trimethyl ammonium bromide is dissolved completely, adding a certain amount of thiacetamide, stirring the thiacetamide till the thiacetamide is dissolved completely, regarding the formed mixing liquid as a precursor solution of the silver indium sulfide heterojunction structure nano material, refluxing and heating the precursor solution in a round bottom flask with three necks by using a hydro-thermal method, changing conditions, and obtaining nano structure materials with different shapes. The reaction system is simple, the reaction temperature is low, the synthesized silver indium sulfide structure is novel, the synthesized composite material yield is high, and the reverse specific discharge capacity of the material is high when the material serves as a lithium material cathode. Besides, the method has good repeatability and operability.

Disclosed are a nitrogen-doped nickel cobalt oxide nanowire array and a preparation method thereof. The preparation method comprises the following steps of performing mixing on cobalt nitrate, nickelnitrate, ammonium fluoride and urea to be subjected to a reaction to enable a nickel cobalt oxide precursor nanowire array to be grown on foamed nickel firstly; next, performing high-temperature calcining on the nickel cobalt oxide precursor nanowire array to synthesize an NiCo<2>O<4> nanowire array; and finally, performing high-temperature calcining on the NiCo<2>O<4> nanowire array and performing nitrogen doping on the NiCo<2>O<4> nanowire array grown on the foamed nickel to prepare the nitrogen-doped NiCo<2>O<4> nanowire array grown on the foamed nickel, so that the conductivity of NiCo<2>O<4> is improved, thereby improving the battery performance; and the preparation method has the characteristics of simple operation, low cost, environment protection and no pollution.

Preparation of a C-coated LiMn2O4 nanowire with a high-temperature solid-state method comprises the following steps: firstly, preparing a MnO nanowire precursor; secondly, placing glucose and the precursor in a hydrothermal reactor in proportion for a reaction at a certain temperature and coating a MnO nanowire with a C layer; finally, performing solid-state sintering on the MnO nanowire coated with the C layer and LiOH in proportion at a high temperature to obtain the C-coated LiMn2O4 nanowire. C-coated LiMn2O4 can be prepared, keeps nanowire morphology and has the characteristics of being simple to operate and low in cost.

The invention provides a polysiloxane nanosheet-coated graphene sponge composite as well as a preparation method and application thereof. The preparation method comprises the following steps: taking hydrothermally prepared 3D-GNS as an impregnation preform and polysiloxane as precursor solution, and realizing an effect that PSO is adsorbed on the surfaces of nano graphene sheets through vacuum impregnation; and performing crosslinking and pyrolysis, thus a SiOC nano layer-coated 3D-GNS composite electrode material is obtained. The invention provides a simple method for preparing a 3D-GNS/SiOCcomposite electrode material, cost is low, and conditions are easy to control; the prepared 3D-GNS/SiOC composite electrode material can be used for preparing a SiOC electrode material with a three-dimensional communicated graphene conductive network and a 'sandwich' structure (SiOC/GNS/SiOC); three-dimensional graphene sponge modification is adopted, thereby having great significance in preparation of other high-performance composite electrode materials; and 3D-GNS/SiOC has relatively high capacity and rate performance when being taken as a lithium battery anode material, and the current highenergy demand development trend is met.

The invention belongs to the technical field of material preparation, and relates to a nickel oxide/porous carbon material capable of being used for a lithium ion battery negative electrode, and a preparation method and application of the nickel oxide/porous carbon material. The preparation method comprises the following steps of mixing terephthalic acid, trimesic acid and nickel nitrate in DMF, reacting in a hydrothermal kettle, and washing and drying the reacted product with ethanol; and enabling a completely dried sample to carry out high-temperature reaction in a tubular furnace in the atmosphere of introducing argon, enabling a cooled product to carry out high-temperature reaction in the air atmosphere to obtain the nickel oxide/porous carbon. The method provided by the invention is environment-friendly and high in preparation operation controllability, the nickel oxide nanoparticles are uniformly dispersed in the porous carbon, and the excellent lithium ion battery performance can be obtained.

The invention belongs to the technical field of lithium battery manufacturing, and particularly relates to a preparation method of a high-performance lithium battery negative electrode material, whichis characterized in that spherical TiO2 with a micron size is selected as a loading template according to the shape and size of MoS2, the spherical TiO2 and the MoS2 are matched in size, sodium molybdate is used as a molybdenum source, thioacetamide is used as a sulfur source, cetyl trimethyl ammonium bromide (CTAB) is used as an activating agent, and flaky MoS2 is successfully loaded on the surface of TiO2 by a hydrothermal synthesis experimental method to obtain a TiO2/MoS2 composite material with a core-shell structure. The material has the advantages of synergistic effect, more excellentelectrical property, higher capacity, good cycling stability, rate capability and the like, has high metal component content, can replace a carbon material in an original battery, is nonflammable andgreat improves the safety of a lithium ion battery.

The invention discloses a graphene loaded transition metal silicate nano film material for a lithium ion battery and a preparation method of the nano film material. The nano film material is preparedfrom transition metal salt, a complexing agent, graphene and silicon tetrachloride in an organic alcohol phase system by a solvothermal method; a chemical formula of the nano film material is M2SiO4/SiO2/G; M is transition metal Mn, Fe, Co or Ni; and G is the graphene. The material is used in a lithium ion battery cathode; a two-dimensional nano film structure of the material facilitates transmission of charge in the material, and can effectively reduce volume expansion of the material in a lithium disembedding process; and high capacity and excellent cycle performance are represented.

The invention discloses a liquid medium based temperature-controlled and voltage-controlled lithium battery formation device, which comprises a liquid container, a sealing system, a liquid supply system, a temperature and pressure control system and a power system. By using liquid as a flowing medium, the temperature-controlled and voltage-controlled lithium battery formation device can avoid pollution and distortion of lithium batteries, has no risk of short circuit, and can ensure uniform pressure inside lithium batteries in the process of formation and improve the performance of lithium batteries. Because various types of non-corrosive liquid can be used, the device has good convenience. In addition, the functions of electrochemical detection and package leak detection can be added during formation.