35results about How to "Lower specific capacity" patented technology

The invention discloses a lithium-sulphur battery anode material, which adopts the technical scheme that elemental sulphur or lithium sulfide is loaded into one or various carrier materials to form a novel composite electrode for a lithium-sulphur battery. The carrier material (s) is (are) characterized in that within the operation voltage range of the elemental sulphur or the lithium sulfide, the carrier material (s) is (are) also provided with electrochemical activity, that is, is (are) provided with considerable lithium storage capacity, and simultaneously has (have) characteristics of high specific surface and high porosity. The invention also discloses a preparation method of the lithium-sulphur battery anode material. The system of the electrode solves problems that the carrier material of a conventional lithium-sulphur battery anode material is not provided with the electrochemical activity and is low in composite material specific capacity within the operation voltage range of the elemental sulphur or the lithium sulfide, and the integral specific capacity of the composite electrode and the energy density of the lithium-sulphur battery are improved.

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si/CuOx/C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si/CuOx/C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.

The invention discloses a lithium NCM (nickel cobalt manganese) material. The lithium NCM material is prepared by doping Mg (magnesium), Al (aluminum) or Ti (titanium) and F (fluorine) into a 811 type lithium NCM cathode material. The lithium nickel manganese cobalt material has the advantages that by simultaneously doping Mg, Al or Ti and F into the 811 type NCM electrode material, the rate discharge property and specific capacity of the material are effectively improved; the corrosion of HF (hydrogen fluoride) to the material is effectively inhibited, the dissolving of Co is reduced, and the structure stability and thermal stability of the material are greatly improved.

The invention discloses a method for improving the electrochemical performance of a positive material LiNi0.5Mn1.5O4 of a lithium ion battery, and belongs to the field of the positive material of the lithium ion battery. The method reduces the using amount of Cr<3+> for improving the electrochemical performance of LiNi0.5Mn1.5O4 by a conventional bulk phase doping method, reduces the environmental pollution and the human health hazard caused thereby and eliminates the hidden trouble of striping of a covering layer existing in a covering modification method. The method comprises the following steps of: dissolving chromium nitrate in aqueous solution of ethanol; adding LiNi0.5Mn1.5O4 into the solution and dispersing and stirring the mixture until the liquid phase is eliminated; and calcining the mixture and naturally cooling the mixture to obtain the positive material LiNi0.5Mn1.5O4 of the lithium ion battery with high electrochemical performance. The method improves the electrochemical performance of the positive material LiNi0.5Mn1.5O4 of the lithium ion battery, reduces the using amount of the chromium salt, ensures no obvious boundary between the doped Cr<3+> layer and the body of the positive material, reduces the environmental pollution, and also reduces the hazard to the human health.

The invention relates to a sulfur/nitrogen/silicon co-doped graphite composite negative electrode material and a preparation method thereof, and belongs to the technical field of the technical field of lithium ion battery material preparation. The technical solutions are as follows: (1) weighing 1 to 5 g of sulfur-containing organic compounds and 1 to 5 g of nitrogen-containing organic compounds,adding the compounds to 500 g of organic solvent, stirring evenly, adding 100 g of graphite into the solution, stirring evenly, filtering, then transferring the solution to a tube type furnace, raising the temperature to 200-500 DEG C under an inert atmosphere, then keeping the temperature for 1 to 6 h, and reducing the temperature to the room temperature in an inert atmosphere to obtain a graphite composite material A; (2) implanting the nano-silica in the surface layer of the graphite composite material A through high-speed particle beam bombardment and then carrying out carbonization to obtain the sulfur/nitrogen/silicon co-doped graphite composite anode material. According to the invention, the specific capacity of the graphite material is improved by doping sulfur in the graphite material, and nitrogen doping is carried out to improve the conductivity of the sulfur; the expansion of the material can be reduced; and the liquid absorption capacity of the material can be improved.

The invention discloses a novel silicon-based nanometer composite material for a lithium ion battery anode and a preparation method of the novel silicon-based nanometer composite material, belonging to the field of electrochemical sources. The preparation method comprises the following steps: adding a small amount of graphite and ductile metal element tin, thereby preparing a silicon-based nanometer bicontinuous phase structure composite material by adopting a high energy ball milling method. Generally, the atomic percent of silicon in the selected alloying component is over 50 percent, properly 65-80 percent. The high energy ball milling is performed under argon atmosphere protection, and compounding between silicon and the ductile metal tin is realized by utilizing continuous cold welding and tearing under high-energy impact, so that the silicon and the metal element tin with high deformation capacity are interpenetrated, and an open three-dimensional mesh structure is formed in the space. The novel silicon-based nanometer bicontinuous phase structure composite material is simple in preparation process and low in cost and has excellent electrochemical performance and excellent application prospects.

The invention relates to a positive electrode active material, comprising a composite material of Li2MoO3 and molybdenum carbide. The invention also provides a preparation method of the positive electrode active material and a lithium ion battery. The lithium ion battery prepared by the invention is good in electrical conductivity and high in charge and discharge capacity.

The invention discloses a Si-Sn composite material used for a Li-ion battery anode and a preparation method thereof. The composite anode material is of a Sn-fiber-wound Si particle composite structure and composed of two elements Si and Sn, wherein the Si content is 20-70at.% and the balance is Sn. According to the preparation method of the composite anode material, Si and Sn powder are mixed and the mixed powder is ball milled by using a high-energy ball milling method in an argon atmosphere; under the action of high-energy impact, metal Sn particles deform seriously, are subjected to cold welding and torn to form Sn fibers; through further ball milling, fiber-structured ductile-phase metal Sn formed after high-energy ball milling and Si particles smashed under high-energy impact in the ball milling process are composited to form a Sn-fiber-wound Si particle composite structure. The novel Sn-fiber-wound Si composite material is simple in preparation process and low in cost; in addition, the composite material is novel and unique in structure and excellent in electrochemical performance and therefore has excellent application prospect.

The invention discloses a temperature-sensitive diaphragm, a preparation method thereof and application of the temperature-sensitive diaphragm. The temperature-sensitive diaphragm is prepared from a composite material; the composite material comprises a matrix layer and a polymer layer grafted on the matrix layer; the matrix layer is graphene oxide (GO); and the polymer layer is polysulfobetaine.The preparation method comprises the following steps that: hydroxylation treatment is performed on GO, so that GO-OH can be obtained; an organic Br group is introduced to the surface of GO-OH; polysulfobetaine is covalently grafted to the surface of GO, and a composite material is obtained; the composite material is dispersed, and the dispersed composite material is prepared into a composite filmthrough vacuum filtration. According to the temperature-sensitive diaphragm, the preparation method thereof and the application of the invention, the temperature-sensitive polymer polysulfobetaine isintegrated into a diaphragm, so that the temperature-responsive intelligent diaphragm can be obtained; and on the basis of the temperature response behavior of the polysulfobetaine, reversible controlover lithium ion transmission by the diaphragm at different temperatures is realized, and exothermic side reaction and thermal runaway are sensed and inhibited in time.

The invention discloses a CNTs (carbon nanotubes)-doped tin oxide negative electrode material for a lithium-ion battery and a preparation method thereof. The preparation method comprises the following steps: firstly, compositely electroplating a CNTs-doped tin plating layer with the thickness of 10-15 microns on one side of the surface of a substrate of a pretreated copper strip; and secondly, anodizing the material obtained in the first step to obtain a mesoporous oxide, and performing heat treatment to finally obtain the lithium-ion battery negative electrode material with CNTs-uniformly-doped mesoporous tin oxide layer on one side of the surface of the substrate of the copper strip. The mesoporous diameter is 3-10nm and the obtained oxide layer has the thickness of 5-10 microns. The first specific discharge capacity of the lithium-ion battery negative electrode material can be as high as 650mAh/ g, and after 50 cycles, the specific capacity is attenuated by only 0.8%-5%. The preparation method is simple in process, and large-scale industrial production can be carried out.

The invention relates to the field of aluminum air batteries, and discloses a double-electrolyte aluminum air battery. The double-electrolyte aluminum air battery comprises an aluminum anode (8), an anode reaction room (7), a diaphragm (6), a cathode reaction room (5) and an air cathode (4), wherein the cathode reaction room (5) and the anode reaction room (7) are separated by the diaphragm (6); electrolyte channels are arranged on the reaction rooms; electrolyte filling can be performed outside; and a cathode electrolyte and an anode electrolyte can enter the cathode reaction room (5) and theanode reaction room (7) from the respective electrolyte channels to participate in reaction. According to the double-electrolyte aluminum air battery, self-corrosion of the aluminum anode of the aluminum air battery in a high-concentration strong-basicity solution can be effectively avoided; high oxygen reduction reaction activity of the air cathode can be ensured; and the double-electrolyte aluminum air battery has the biggest characteristic that a common aluminum sheet can serve as the aluminum anode without a special alloy. Compared with a single-electrolyte neutral solution, the double-electrolyte aluminum air battery avoids a defect of electrode and reaction room blocking caused by quick sediment generation.

The invention discloses a preparation method of a high performance oxide-coated nano-SnO2 negative electrode material, and the preparation method comprises the following steps: firstly, surface-passivation treatment is performed on nano-SnO2 particles, and then the surface of the nano-SnO2 particles is coated with an oxide. The negative electrode material prepared by the method has a large specific capacity, the volume expansion effect of the negative electrode material during charging and discharging of a lithium ion battery can be inhibited, and the high performance oxide-coated nano-SnO2 negative electrode material has good charge and discharge cycle performance, and has simple preparation method and good repeatability.

The invention belongs to the technical field of battery materials, and particularly relates to a ternary positive electrode precursor material, a preparation method thereof and a ternary positive electrode material. Wherein the ternary positive electrode precursor material comprises a ternary oxide precursor with a chemical general formula of Ni (1-y-z) CoyMnzOx, x is greater than or equal to 1 and less than or equal to 1.2, y is greater than or equal to 0.03 and less than or equal to 0.1, and z is greater than or equal to 0.2 and less than or equal to 0.35. The material provided by the invention is a ternary positive electrode precursor material, and the content of nickel in the ternary positive electrode precursor material is effectively improved and the content of cobalt is reduced by regulating and controlling the ratio of main metal elements in the ternary oxide precursor, so that the ternary positive electrode precursor material has relatively good structural stability and high capacity at the same time; therefore, the cycling stability and the gram volume of the corresponding ternary positive electrode material are improved.

The invention discloses a method for manufacturing a lithium ion battery cell by using a nano silicon material, which belongs to the field of lithium ion batteries, and comprises the following steps: preparing a negative electrode by using a self-made conductive binder; preparing a positive electrode; and winding the positive electrode, the negative electrode and the diaphragm to obtain a pole group, and then putting the pole group into a shell, injecting liquid and sealing to obtain the lithium ion battery cell. According to the invention, through the self-made conductive binder, a spatial three-dimensional polymer network structure is formed on the surfaces of the binder nano silicon particles, so that the silicon negative electrode material has relatively strong mechanical properties, and the stability of the silicon negative electrode material in charging/discharging operation is remarkably improved; the conductive carbon black is uniformly bonded and dispersed in the binder, so that not only can the addition amount of free carbon black in the positive electrode slurry be reduced, but also a three-dimensional conductive network system can be formed, and excellent conductivity can be realized with a small amount, thereby effectively improving the capacity and power of a lithium battery cell.