Abstract: A solvothermal method for making a lithium iron phosphate is disclosed. The waste liquid of a solvothermal reaction is treated synthetically by flash evaporation and a centrifugal separation to separate the water, the organic solvent, and the lithium sulfate, which is a byproduct from each other. One part of the separated organic solvent is reused as a reaction material of the solvothermal reaction to form a organic solvent recycle circuit. The other part of the separated organic solvent is mixed with the separated water to be used as a washing liquid. The washing liquid is retreated by flash evaporation and centrifugal separation to obtain the water and the organic solvent again to form a washing liquid circuit.

Abstract: A solvothermal apparatus for making lithium iron phosphate is disclosed. The solvothermal apparatus comprises a manufacture unit and a recycle unit. The manufacture unit comprises a feeding device, a reaction device, a filtering device, and a countercurrent washing device which are sequentially connected to each other. The recycle unit comprises a flash evaporation device and a solid-liquid separation device connected to the flash evaporation device. A waste liquid produced by the manufacture unit is recycled by the recycle unit.

Abstract: A method for making a sulfur based cathode composite material is disclosed. Polyacrylonitrile and elemental sulfur are dissolved together in a first solvent to form a first solution. An electrically conductive carbonaceous material is added to the first solution to mix with the polyacrylonitrile and the elemental sulfur. An environment in which the polyacrylonitrile and the elemental sulfur are located in is changed to reduce a solubility of the polyacrylonitrile and the elemental sulfur in a changed environment to simultaneously precipitate the polyacrylonitrile and the elemental sulfur, thereby forming a precipitate having the electrically conductive carbonaceous material. The precipitate is heated to chemically react the polyacrylonitrile with the elemental sulfur. A sulfur based cathode composite material is also disclosed.

Abstract: A method for making a sulfur based cathode composite material is disclosed. Polyacrylonitrile and elemental sulfur are dissolved together in a first solvent to form a first solution. An additive is added to the first solution to mix with the polyacrylonitrile and the elemental sulfur. The additive is at least one of metal and metal sulfide. An environment in which the polyacrylonitrile and the elemental sulfur are located in is changed to reduce a solubility of the polyacrylonitrile and the elemental sulfur in a changed environment to simultaneously precipitate the polyacrylonitrile and the elemental sulfur, thereby forming a precipitate having the additive. The precipitate is heated to chemically react the polyacrylonitrile with the elemental sulfur.

Abstract: An apparatus for making a battery slurry is disclosed. The apparatus comprises a vacuum system providing a vacuum environment, a dry powder mixing device mixing a plurality of powdery materials uniformly to obtain a dry powder, a kneading device kneading the dry powder with the first part solvent to form a doughy mixture, and a high speed dispersing device dispersing the doughy mixture to the second part solvent to form the battery slurry. The vacuum system, the dry powder mixing device, the kneading device, and the high speed dispersing device are connected to each other.

Abstract: A method for making a battery slurry is disclosed. The method comprises providing a plurality of solid raw materials and at least one liquid raw material, the at least one liquid raw material is divided into a first part solvent and a second part solvent to be used; mixing the plurality of solid raw materials to obtain a dry powder; kneading the dry powder and the first part solvent to obtain a doughy mixture; and dispersing the doughy mixture to the second part solvent to obtain the battery slurry.

Abstract: An anode composite material includes an anode active material and a polymer composited with the anode active material. The polymer is obtained by polymerizing a maleimide type monomer with an organic diamine type compound. The maleimide type monomer is a maleimide monomer, a bismaleimide monomer, a multimaleimide monomer, a maleimide type derivative monomer, or combinations thereof. A method for forming the anode composite material and a lithium ion battery are also disclosed.

Abstract: A method for screening a lithium ion battery is provided. A number of lithium ion batteries are galvanostatically discharged a to an inflection point voltage at an inflection point of a discharge curve at a first constant current I1. The number of lithium ion batteries are rested for a first rest time T1 to raise an open circuit voltage of the number of lithium ion batteries to U1. U1 is greater than the inflection point voltage. The number of lithium ion batteries are galvanostatically discharged to the inflection point voltage at a second constant current I2, in which I2<<I1. The number of lithium ion batteries are rested for a second rest time T2 and the batteries are screened based on a self-discharge of the number of lithium ion batteries.

Abstract: A method of screening a lithium ion battery is provided. A number of lithium ion batteries are galvanostatically discharged to a discharge cutoff voltage V0 at a first constant current I1. The number of lithium ion batteries are rested for a first rest time T1. The number of lithium ion batteries are galvanostatically charged to a charge cutoff voltage V1 at a second constant current I2. The number of lithium ion batteries are rested for a second rest time T2, and the batteries are screened based on a self-discharge of the plurality of lithium ion batteries.

Abstract: A method for making a cathode composite material is disclosed. In the method, a maleimide-based material is provided. The maleimide-based material is a maleimide monomer, a maleimide polymer formed from the maleimide monomer, or combinations thereof. The maleimide-based material, an inorganic electrical conductive carbonaceous material, and a cathode active material are mixed to form a mixture. The mixture is heated to a temperature of about 200° C. to about 280° C. in a protective gas to obtain the cathode composite material. A cathode composite material and a lithium ion battery are also disclosed.

Abstract: A lithium metal electrode includes a lithium metal plate and a protective layer coated on a surface of the lithium metal plate. The protective layer includes an organic-inorganic hybrid polymer comprising a repeating unit. The repeating unit includes a silicon atom, a methacryloyloxy group or an acryloyloxy group, and at least two alkoxy groups. The alkoxy groups and the methacryloyloxy group or the acryloyloxy group are respectively joined to the silicon atom. A method for preparing the lithium metal electrode and a lithium ion battery is also disclosed.

Abstract: A composite binder includes an organic-inorganic hybrid polymer and a fluorinated binder uniformly mixed with each other. A repeating unit of the organic-inorganic hybrid polymer includes a silicon atom, a methacryloyloxy group, or an acryloyloxy group, and at least two alkoxy groups. The alkoxy groups and the methacryloyloxy group or the acryloyloxy group are respectively joined to the silicon atom. A method for making a cathode electrode and the cathode electrode are also disclosed.

Abstract: A powder sintering device is disclosed. The powder sintering device includes a support unit, an actuator unit located on the support unit, a sintering unit, and a reaction unit. The reaction unit is located inside of the sintering unit and heated by the sintering unit. The reaction unit is fixed to the actuator unit and driven to rotate by the actuator unit.

Abstract: An automatic weighing and sorting apparatus for battery electrode sheets is provided. The automatic weighing and sorting apparatus includes a conveying device, a weighing device, and a sorting device. The conveying device is configured to transfer a number of battery electrode sheets to the weighing device. The weighing device is configured to get a weight of each of the number of battery electrode sheets. The sorting device is configured to sort the number of battery electrode sheets based on the weight of each of the number of battery electrode sheets.

Abstract: An anode binder, a cathode electrode material, and a lithium ion battery are disclosed. The anode binder includes a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer. The anode electrode material includes an anode active material, a conducting agent, and the anode binder. The lithium ion battery includes an anode electrode, an electrolyte, a separator, and the cathode electrode, the cathode electrode comprising a cathode active material, a conducting agent, and the anode binder.

Abstract: An electrode binder, a cathode electrode material, and a lithium ion battery are disclosed. The electrode binder includes a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer. The cathode electrode material includes a cathode active material, a conducting agent, and the electrode binder. The lithium ion battery includes an anode electrode, an electrolyte, a separator, and the cathode electrode, the cathode electrode comprising a cathode active material, a conducting agent, and the electrode binder.

Abstract: A method for carbon coating on an electrode active material of a lithium ion battery is disclosed. The method comprises mixing a plurality of electrode active material particles, a carbon source, and a first solvent to obtain a first mixture liquid; heating the first mixture liquid at a temperature from about 130° C. to about 240° C. under a pressure from about 0.2 MPa to about 30 MPa to obtain a plurality of carbon source coated electrode active material particles; separating the plurality of carbon source coated electrode active material particles from the first mixture liquid; and sintering the plurality of carbon source coated electrode active material particles to obtain a plurality of carbon coated electrode active material particles.

Abstract: A method for preparing sulfur-based cathode material is disclosed. First, polyacrylonitrile and sulfur according to a proportion are dissolved in a first solvent at a first temperature to obtain a first solution. Second, the first solution is transferred into a second solvent at a second temperature, to precipitate the polyacrylonitrile and sulfur to form a precipitated material. Third, the precipitated material is filtered and heated to produce a sulfurized polyacrylonitrile.

Abstract: A lithium ion battery includes an anode electrode, an electrolyte, a separator, and a cathode electrode. The cathode electrode includes a cathode active material, a conducting agent, and a cathode binder. The cathode binder includes a polymer obtained by polymerizing a maleimide type monomer with an organic diamine type compound.

Abstract: A method for carbon coating on an electrode active material of a lithium ion battery is disclosed. The method comprises carrying out a liquid phase reaction of an electrode active material precursor in a first solvent, thereby obtaining a first mixture liquid comprising the first solvent, and a plurality of electrode active material particles dispersed in the first solvent; adding a carbon source into the first mixture liquid, thereby obtaining a second mixture liquid; drying the second mixture liquid, thereby obtaining a plurality of carbon source coated electrode active material particles; and sintering the plurality of carbon source coated electrode active material particles, thereby obtaining a plurality of carbon coated electrode active material particles.