121 results about "Specific energy density" patented technology

The invention discloses an energy storage device of magnetic suspension flywheel, comprising an energy storing and converting part, a magnetic suspension supporting part and an auxiliary part, wherein the energy storing and converting part includes a flywheel, a rotor of the motor/generator and a stator part; the magnetic suspension supporting part comprises a radial magnetic bearing, an axial magnetic bearing, an axial sensor, a radial sensor and a protection bearing; the auxiliary part includes a shell and a mounting shaft; the radial magnetic bearing is a radial mixed conical magnetic bearing; the suction disk of each axial magnetic bearing is respectively installed on two side wheel surfaces of the flywheel; the radial mixed conical magnetic bearing and the axial magnetic bearing are non-mechanically contacted magnetic suspension bearings; the mounting shafts of the energy storing and converting part, the magnetic suspension supporting part and the auxiliary part are sealed in the shell of the auxiliary part; the inside of the shell is in vacuum state. The invention has the characteristics of compact structure, high specific energy density and discharge depth, long service life, low power consumption and stable performance without pollution.

The invention discloses a flexible high-sulfur load self-repairing cathode structure for a lithium-sulfur battery and a preparation method of the flexible high-sulfur load self-repairing cathode structure, and belongs to the field of electrochemical batteries. The lithium-sulfur battery cathode structure disclosed by the invention is composed of graphene/high-molecular polymer flexible foam and a carbon/sulfur active material layer, wherein the active material is sulfur; and the graphene/high-molecular polymer flexible foam provides strength and a self-repairing function. The flexible high-sulfur load self-repairing cathode structure has the characteristics that a multicomponent integrated design of the lithium-sulfur battery is realized; the electrochemical property is ensured; meanwhile, the content of sulfur is increased; high active material surface density of the battery is realized; the obtained lithium-sulfur battery has the advantages of high specific capacity and high specific energy density, and simultaneously has flexibility and self-healing characteristics; the preparation process of the flexible high-sulfur load self-repairing cathode structure is simple and easy to control; large-scale and low-cost preparation can be realized; and the application value is wide.

Provided herein are energy storage devices comprising at least one dry process, self-supporting electrode film having improved performance. The improved performance may be realized as improved electrode material loading, improved active material loading, improved active material density, improved areal capacity, improved specific capacity, improved areal energy density, improved energy density, improved specific energy density, or improved Coulombic efficiency.

The invention discloses a mesoporous carbon loaded sulfur/selenium flexible electrode based on a three-dimensional graphite alkene self-supporting structure. The invention further discloses a preparation method of the electrode, and application of the mesoporous carbon loaded sulfur/selenium flexible electrode based on the three-dimensional graphite alkene self-supporting structure in preparing a lithium ion secondary battery. The invention further discloses a lithium-sulfur battery and a lithium-selenium battery both comprising the electrode. The mesoporous carbon loaded sulfur/selenium flexible electrode based on the three-dimensional graphite alkene self-supporting structure, provided by the invention, has good mechanical performance and electrical performance, can effectively improve the specific energy intensity of the electrode; the lithium-sulfur(selenium) battery manufactured by adopting the electrode has the advantages of small size, high capacity, long service life and high efficiency, and has very high application potential and commercial value.

The invention relates to a silicon-carbon composite negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery materials. The preparation method of the silicon-carbon composite negative electrode material comprises the following steps: uniformly mixing a silane coupling agent and a porous carbon material in an organic solvent and performing spray drying to obtain a modified porous carbon material; in the presence of silane gas, performing heat preservation of the modified porous carbon material at 1000 to 1200 DEG C for 1 to 6 h; thencooling to 600 to 800 DEG C, and in the presence of a gas dopant, performing heat preservation for 1 to 6 h to obtain a silicon-carbon material, wherein the gas dopant is one or a combination of morethan one of NH3, N2O, NO and N2O4; and in the presence of carbon source gas, performing heat preservation of the silicon-carbon material at 700 to 900 DEG C for 1 to 12 h, thereby obtaining the silicon-carbon compositie negative electrode material. The silicon-carbon composite negative electrode material prepared by the invention has the characteristics of high specific capacity, high conductivityand good cycle performance, and can be applied to lithium ion batteries with high specific energy density.

The invention discloses a preparation method for a stannic disulfide/graphene nanocomposite, a negative electrode of a lithium ion battery, and the lithium ion battery. The preparation method comprises the following steps of performing a hydrothermal process and a compounding process. By adoption of the preparation method, the stannic disulfide is subjected to direct in-situ growth on the surface of graphene; then the obtained stannic disulfide is washed and dried to obtain the sheet-shaped stannic disulfide/graphene nanocomposite; the material is applied to the negative electrode material of the lithium ion battery; the stability and the conductivity of the material are effectively improved; the performance of the battery is improved; and the stannic disulfide/graphene nanocomposite has the advantages of high cycling stability, high specific energy density and the like.

The invention discloses application of a tellurium based material serving as a negative electrode active material in a sodium-based dual-ion cell, the sodium-tellurium dual-ion cell and a preparationmethod thereof and relates to the field of electrochemical energy storage devices. The invention further discloses application of tellurium, a tellurium compound or a tellurium composite material serving as the negative electrode active material in the sodium-based dual-ion cell. The sodium-tellurium dual-ion cell comprises a negative electrode, a positive electrode, a diaphragm and electrolyte; the negative electrode active material comprises tellurium, the tellurium compound or the tellurium composite material; the positive electrode active material comprises a material capable of being reversibly embedded and dis-embedded into negative ions in the electrolyte; the electrolyte comprises a sodium salt and a non-aqueous solvent. The safety problems existing in the conventional sodium-ion battery taking a carbon material as the negative electrode material that the potential is low, sodium is easily separated out and a tinfoil serving as the negative electrode is simple in volume expansion and is easily powdered are solved. According to the sodium-tellurium dual-ion cell disclosed by the invention, the sodium ion and the tellurium negative electrode can carry out an alloying reaction, the reaction potential is high, and the sodium-tellurium dual-ion cell has the characteristics of being high in safety, high in specific energy density and stable in cycle.

The invention provides a lithium ion battery positive paste, a preparation method thereof, a lithium ion battery and a positive pole plate. The positive paste provided by the invention comprises a lithium nickel manganese cobalt material, a binding agent, a conductive agent and a solvent, wherein the lithium nickel manganese cobalt material comprises a lithium nickel manganese cobalt material A with D50 being 7.5-9.5 micrometers and a lithium nickel manganese cobalt material B with D50 being 10.5-11.5 micrometers, and the mass ratio of the lithium nickel manganese cobalt material A and the lithium nickel manganese cobalt material B is (0.2:0.8)-(0.8:0.2). The lithium nickel manganese cobalt material with different grain sizes are used for preparing the positive paste according a certain proportion, the positive paste is used for preparing the battery positive pole plate, thus, the compaction density of the positive electrode material obtained by preparation is improved, and meanwhile, the specific energy density of the battery obtained by preparation is finally improved.

The invention discloses a preparation method of a positive electrode material (carbon-coated iron-manganese-lithium phosphate) of a lithium ion battery, and relates to the technical field of preparation of positive electrode materials of lithium ion batteries. The preparation method comprises the following steps: preparing a high-activity iron-manganese precursor mixture by oxidation-reduction reaction, and treating a lithium source, a phosphorus source, a carbon source and the iron-manganese precursor mixture by the steps of mixing, drying, sintering and the like so as to obtain the positive electrode material (carbon-coated iron-manganese-lithium phosphate) of the lithium ion battery. The preparation method has the characteristics of high reaction activity of the synthesized iron-manganese precursor, no need of the grinding procedure in mixing materials, low sintering temperature, short temperature-maintaining time and the like; the prepared positive electrode material (carbon-coated iron-manganese-lithium phosphate) of the lithium ion battery has the advantages that the first discharging capacity is up to 155.2mAh/g when the rate is 0.1C, the discharging capacity is more than 140mAh/g when the rate is 0.2C, so that the good electro-chemical performance and rate performance are shown, and simultaneously, all performance indexes of the material give consideration to the processing performance. Compared with the lithium iron phosphate material, the working voltage of the synthesized material and specific energy of the material are increased, so that the benefit is brought for increasing the specific energy density of a battery core at the later stage.

The present invention provides process of synthesizing spherical or spheriodal lithium phosphate. The compounds of lithium ion, transition metal ion and phosphate radical ion are mixed, ground and pyrolyzed in inert atmosphere to obtain the intermediate product; the intermediate product is mixed with certain amount of melting alkali salt and sintered at high temperature to obtain initial product; and the initial product is washed, filtered and dried to obtain spherical or spheriodal lithium phosphate grains of diameter 1-5 microns, with the grain size being controllable by means of the synthesis conditions. The process has short sintering time, low power consumption, and the spherical or spheriodal lithium phosphate product has small specific surface area, excellent processing performance, great tap density, high energy density and high safety, and may be used widely in power battery for electrically driven tool, electric bicycle, etc.

The invention discloses a novel lithium ion power battery module design method and a battery module, which are applied to an aluminum shell square battery module. By designing and developing the battery module according to the method, the gravimetric specific energy and volumetric specific energy of the battery module can be increased remarkably under the condition of constant energy density of a battery monomer, thereby remarkably increasing the overall energy density of a battery system. The method is of great significance to the development of the electric vehicles. Moreover, the battery module developed according to the method has high assembly performance and interchangeability, the assembly performance of the battery system is improved, and the production efficiency is increased.

The invention discloses a modified lithium manganese phosphate composite anode material and a preparation method thereof. The problem that an existing lithium manganese phosphate anode material is poor in conductivity, poor in rate capability and unstable in circulation is solved. The nominal molecular formula of the composite anode material disclosed by the invention is yLiMnPO4.(1-y)Na3V2(PO4)3-xF3x/C, wherein x is greater than or equal to 0 and smaller than or equal to 2; and y is greater than or equal to 0.75 and smaller than 1. The preparation method comprises the following steps: (1) carrying out mechanical activation dispersion of LiMnPO4 powder and modified precursor raw materials; (2) controlling to prepare a lithium manganese phosphate/vanadium-containing colloid precursor; and (3) carrying out a one-step calcination method to prepare a lithium manganese phosphate/sodium (fluoro)phosphate vanadium/carbon composite material. The modified lithium manganese phosphate composite anode material has the beneficial effects that the material is simple in technological process, uniform in dispersion and easy to control, and the synergistically modified LiMnPO4-based composite material is high in specific energy density, good in cycle performance and excellent in rate capability.

The invention provides a lithium titanate negative electrode material and a preparation method thereof. The lithium titanate negative electrode material is prepared from LiOH.H2O and TiO2 based on mole ratio of (0.7-0.9):1. The preparation method comprises the following steps of: uniformly mixing the LiOH.H2O and TiO2 to obtain a first material; adding the first material to a defined amount of deionized water and crushing to obtain a second suspension material; drying the second material to obtain a precursor; sintering the precursor at high temperature being 600-900 DEG C for 5-20h to obtain a third material; and sieving the third material in 400 meshes to obtain the lithium titanate negative electrode material in a shape of a sphere. The lithium titanate negative electrode material prepared by the method disclosed by the invention has the advantages of wide grain size distribution range, no impurities and high volumetric specific energy density, and solves a problem that the tap density of a negative electrode material of a lithium battery is hard to increase; and the tap density of the lithium titanate negative electrode material is as high as 1.4g/cm<3>.

The invention discloses a carbon nano-tube net/Ni(OH)<2>/PPY composite electrode, a preparation method and application, belonging to the technical field of super capacitors. The carbon nano-tube net/Ni(OH)<2>/PPY composite electrode is a core-shell structure; a core is composed of Ni(OH)<2> and a carbon nano-tube net doped therein; and a shell is uniform and compact PPY formed through an electrochemical deposition method. The composite electrode exerts a double-electrode-layer effect by utilizing the carbon nano-tube net having high specific surface area; with the help of the pseudocapacitance characteristic of the nano metallic oxide Ni(OH)<2>, the specific capacity is increased; simultaneously, depending on the high electric conductivity and the high specific energy density of the polymeric conductive polymer PPY, the discharge capability of the super capacitors under a high rate can be improved; the carbon nano-tube net with a connection point in a composite pole piece is doped in Ni(OH)<2>; therefore, the electric conductivity and the liquid sucking and keeping capability of the material are easily improved; and furthermore, the structural stability of the material can be improved through a net type structure.

The invention relates to a cathode material of a lithium ion battery and preparation of the cathode material, in particular to a Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material and a preparation method thereof. The Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material is prepared from the following raw materials: a ternary precursor Ni0.5Co0.2Mn0.3(OH)2, Li2CO3, Sr(OH)2.8H2O and H3BO3, wherein the stoichiometric ratio of the ternary precursor Ni0.5Co0.2Mn0.3(OH)2 to the Li2CO3 is m(Li<+>)/m(Ni<2+>+Co<2+>+Mn<2+>) which is equal to 1.04 to 1; the Sr doping content is 0.06 to 0.18 percent by mass; the H3BO3 doping content is 0.5 to 1.2 percent by mass; all the raw materials are prepared into the cathode material through high temperature solid phase sintering. Compared with a conventional ternary cathode material, the cathode material prepared through the preparation method is higher in compaction density, and the specific energy density is substantially increased, so that the full battery performance is effectively improved.

The invention discloses a lithium ion battery and a negative electrode composite electrode plate thereof. A preparation method for the negative electrode composite electrode plate comprises the steps of 1) preparing a solution A; 2) preparing a material B; and 3) preparing a silicon/titanium dioxide/carbon composite electrode plate. According to the prepared composite negative electrode plate, based on the zero-strain characteristic of the titanium dioxide material and a relatively high voltage platform, the expansion rate of the material in a charging-discharging process is lowered and the safety performance of the battery is improved; meanwhile, by virtue of a TiO<2>/C coating layer, the electrical conductivity of the composite material is improved, and volume change in a silicon cycling process can be effectively suppressed by virtue of a porous structure; in addition, TiO<2>/C, used as framework support, can provide a three-dimensional space transmission channel for lithium ion transfer; meanwhile, the negative electrode plate can be directly used without requiring a binder and a conductive agent; and the prepared composite negative electrode plate has the characteristics of high gram volume, excellent rate capability and strong liquid absorption and retention capability and the like, so that requirement of the high-specific-energy-density battery on the negative electrode material can be satisfied particularly.

The invention relates to the technical field of battery thermal management, in particular to a tube-through fin type cylindrical battery module, including a battery sleeve, a cylindrical battery and afin group, the fin group is composed of a plurality of fins arranged in parallel, The fin is provided with an assembly circular hole matched with the battery sleeve, the battery sleeve vertically passes through and is mounted in the assembly circular hole of each fin and is matched with the fin, the inner diameter of the battery sleeve is matched with the outer diameter of the cylindrical battery, and the cylindrical battery is connected end to end in series and installed in the battery sleeve. The invention can solve the problems that the temperature field distribution of a cylindrical battery pack arranged horizontally and connected in series to form a pack is uneven and part of the non-specific area is overheated in the prior art. The battery module has higher specific energy density,and can meet the requirements of good temperature uniformity, temperature control performance and low cost, light weight and manufacturability.

In exemplary embodiments, there is provided a scalable process for producing supercapacitor electrodes with very high specific capacitance and specific energy density, and very high capacitance retention after thousands of charge discharge cycles. The electrode material consists of a thin, electrically conductive carbon coating deposited onto nanoporous silicon nanowires. The coating prevents degradation of the silicon nanowires in aqueous solutions, while leaving the pore area fully accessible, enabling application as a supercapacitor electrode with the highest capacitance per projected area to date. The nanowires also are of use as a water splitting electrode and aqueous fuel cell electrode.

The invention discloses a preparation method of a sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet, and the method comprises the following steps: calcining and washing a mixture containing a carbon source, a sulfur source, a nitrogen source and an inorganic salt template agent to obtain the sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet. The sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet prepared by the method has the advantages of large specific surface area, good conductivity, multiple active sites and the like, and excellent performances of high specific energy density and power density are obtained when the nanosheet is applied to a negative electrode of a potassium ion hybrid supercapacitor.

The invention discloses a preparation method of high-density lithium battery anode material spinel lithium manganate. The preparation method comprises the following steps of: step 1, dripping a water solution containing manganese ions into an alkaline solution under the condition of agitating by strong force to obtain sediment product MnOOH; separating the sediment product MnOOH, washing and drying; 2, mixing the prepared MnOOH with a lithium salt or mixing the lithium salt with other metal oxides; and carrying out high-temperature calcination to prepare the spherical or sphere-like-shaped spinel lithium manganate, wherein the grain diameter of obtained spinel lithium manganate grains is in a range of 1-10 microns. If the spherical or sphere-like-shaped spinel lithium manganate LiMn2O4 prepared by the method disclosed by the invention or a monobasic or polybasic compound LiMxMn2-xO4 doped with other metal elements is applied to an ion battery, the density of electrodes of the battery can be improved and the volumetric specific energy density of the battery is increased, so that the whole performance of the battery is obviously improved.