34results about How to "Improve discharge specific capacity" patented technology

The present invention discloses a high-voltage ternary positive electrode material for lithium-ion battery and preparation method thereof. The chemical formula of the material is LiNi_0.6-xMg_xCo_0.2-yAl_yMn_0.2-zTi_zO_2-dF_d, wherein 0<x,y,z,d≤0.05. The precursor of the positive electrode material is synthesized by gradient co-precipitation method and the positive electrode material is prepared by solid phase method. The content of nickel in the synthesized precursor particles has a gradient distribution from the inside to the outside. The obtained precursor is mixed and grinded evenly with the lithium source and the fluorine source at a certain ratio and put into the tube furnace. The obtained precursor is then pre-sintered in the oxygen-enriched air atmosphere and then heated up to be sintered, to obtain the target product. The positive electrode material for lithium-ion battery prepared by the method is free from impurity phase and has a good crystallinity, which is a high energy density positive electrode material.

The invention belongs to the technical field of energy materials, and specifically relates to a modified diaphragm for a lithium-sulfur battery, a preparation method of the modified diaphragm and the lithium-sulfur battery with the diaphragm; the diaphragm adopts a diaphragm body of a commercial battery as a skeleton, and a decorative coating is coated on one side of the diaphragm body; and the decorative coating consists of nanometer inorganic particles containing molybdenum element, a conductive agent and a binder. Through the diaphragm for the commercial battery and the nanometer inorganic particles containing molybdenum element as raw material and a proportional relation among the raw materials, the composite diaphragm for the lithium-sulfur battery is formed through a simple technology, the technology is simple and controllable, a complex and energy-consuming sulfur-filling process is not needed, the raw materials are wide in sources, the cost is low, and the technology is beneficial for large-scale implementation. The lithium-sulfur assembled in the invention is high in capacity and good in cycle performance, and the preparation technology is simple and controllable, economical and environmentally-friendly, and is applicable for large-scale production.

The invention discloses a composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and a preparation method thereof. One metallic element in the composite metallic oxide in the anode material is Al of which the mass is 0.02%-0.92% of that of the lithium nickel cobalt manganese oxide; and the other metallic element in the composite metallic oxide in the anode material is one selected from transition metal Co or Zn, and the mass of the other metallic element is 0.2%-4.0% of that of the lithium nickel cobalt manganese oxide. The composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material can be used to exert the respective advantages of the two metallic oxides and the synergy effect between the two metallic oxides sufficiently, thus improving the electrochemical cycle performance and the specific discharge capacity of the anode material under the condition of higher charge cut-off voltage obviously. The preparation method comprises the following steps: forming a hydrotalcite precursor layer on the surface of the lithium nickel cobalt manganese oxide firstly; and roasting to obtain the composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material, thus ensuring the uniform distribution of two kinds of metallic ions in the hydrotalcite precursor and the oxide cladding layer of the final product, thereby exerting the best cladding effect.

The invention relates to an iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and a preparation method thereof. A chemical formula is xLi<2>MnO<3>.(1-x)LiMn<1/3>Ni<1/3>Co<1/3>O<2>-Fe<y>V<z>, wherein x is not less than 0.1 and not greater than 0.9, y is not less than 0 and not greater than 0.1, z is not less than 0 and not greater than 0.1, and y+z is not less than 0.005 and not greater than 0.1. In the preparation method of the iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material, a carbonate precursor containing three elements of nickel, cobalt and manganese is prepared through coprecipitation reaction, a doping element is added while the carbonate precursor containing three elements of nickel, cobalt and manganese is mixed with a lithium compound, and the doping element is at least one of Fe and V. The preparation method is simple in technology and convenient to operate, reduces equipment requirement and manufacturing cost, and satisfies industrial production; by co-doping of iron and vanadium, two metallic elements play a role in synergistic effect, specific discharge capacity and initial coulomb efficiency of the lithium-rich manganese-based positive electrode material are improved, and the lithium-rich manganese-based positive electrode material has better application foreground in the fields of power supply and battery energy storage.

The invention discloses a sulfur-loaded MOF@ conductive polymer material with high electronic conductivity and a preparation method thereof. The method comprises the steps that activated MOF powder isuniformly mixed with elemental sulfur, a mixture is heated after sealing is conducted, and the sulfur-loaded MOF material is obtained after cooling is conducted; the sulfur-loaded MOF material is modified with a surface active agent, the sulfur-loaded MOF material and conductive polymer monomers are dispersed in a solvent, and a polymerization agent is added in to conduct oxidative polymerizationreaction to obtain the sulfur-loaded MOF@ conductive polymer material. The abundant and ordered porous structure of the MOF can be maintained by the material, and the material has a core-shell structure which has better electronic transmission performance. Sulfur can be better dispersed in pores of MOF polarity by the MOF in the form of molecular state, and the MOF has a certain restriction effect on the dispersing of Li2S6 generated in the discharging process. Abundant electronic transmission channels are provided by conductive polymers, and the dissolving and dispersing of Li2S6 in electrolyte can be prevented. The material of a positive electrode of a Li-S battery has high specific capacity and circulation stability due to the synergistic reaction of the MOF and the conductive polymers.

The invention discloses a lithium/sodium dual-ion manganese-based oxide positive electrode material and a preparation method and an application thereof. The preparation method comprises the followingsteps of (1) dispersing transitional metal salt into a solvent to obtain a metal salt solution; (2) dispersing a lithium salt and a sodium salt into the solvent to obtain a mixed solution I; (3) adding the metal salt solution obtained in the step (1) into an oxalic acid solution to be reacted to obtain a reaction solution II; (4) dispersing the mixed solution I obtained in the step (2) into the reaction solution II obtained in the step (3), and next, performing freezing and drying, and grinding into powder to obtain precursor powder; and (5) performing calcining on the precursor powder obtained in the step (4) to obtain the lithium/sodium dual-ion manganese-based oxide positive electrode material. By utilizing the joint advantages of a lithium ion battery and a sodium ion battery, a dual-ion synergistic effect is realized, and high product crystallization, high electrochemical performance, relatively high specific capacity and high cycling stability are shown.

The invention discloses a carbon nanotube limited range selenium composite anode material and a preparation method thereof. In the composite anode material, elemental selenium nanoparticles are limited within a nano space of a one-dimensional limited range of carbon nanotubes at a mass ratio of (0.5-5.0):1. The preparation method comprises the following steps: (1) putting the carbon nanotubes intoa strong acid, stirring, and carrying out heating purification treatment to obtain purified carbon nanotubes; (2) grinding the purified carbon nanotubes obtained in the step (1) with selenium powder,sufficiently mixing, and carrying out low-temperature thermal treatment in a protective atmosphere to obtain the carbon nanotube limited range selenium composite anode material. The carbon nanotube limited range selenium composite anode material disclosed by the invention is capable of inhibiting volume expansion and a shuttling effect, and is high in discharge specific capacity and excellent inhigh magnification charge/discharge performance and circulation performance; and the method disclosed by the invention is simple in process, low in cost and suitable for industrial production.

The invention discloses a cation-anion codoped and modified layered lithium-rich anode material and a preparation method of the material. A chemical general formula of the anode material is Li[Li0.2MCdx]O2-ySy (M is one or a combination of any of Ni, Mn and Co); x is greater than or equal to 0 and less than or equal to 0.1; and y is greater than or equal to 0 and less than or equal to 0.1. The method is simple to operate; the obtained lithium-rich anode material has better cycling stability and rate discharge performance; a capacity retention rate is still 95% after 100 cycles of circulation at 1C heavy current density.

The invention relates to a preparation method of a nano sulfur/nitrogen-doped titanium dioxide composite cathode material. The method comprises the following steps: tetrabutyl titanate and isopropanolare stirred and mixed, HNO3 and acetylacetone are mixed, two mixed liquor are mixed, a sol is formed after stirring at a certain temperature, HNO3 is added for adjusting a pH value, the above solution is placed in a high-temperature hydrothermal reactor for a reaction, and washing and drying are carried out to obtain xerogel, the xerogel and sulfur powder are subjected to ball milling and mixing,and finally the nano sulfur/nitrogen-doped titanium dioxide composite cathode material with uniform morphology size is obtained. The obtained nitrogen-doped titanium dioxide is in a bar shape, has alot of holes with uniform size and uniform distribution, dissolving and shuttle effect of the polysulfide can be effectively inhibited, loss of active substances is reduced, volume expansion problem of an electrode material is solved, cycle performance is improved, specific discharge capacity is increased, and electrochemistry performance of a lithium-sulfur battery is enhanced.

The invention provides a silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and a preparation method thereof. The preparation method adopts octavinylsilsesquioxane and a nitrogen-containing olefin derivative as reaction monomers, and adopts in-situ polymerization and high-temperature calcination treatment, and then performs magnesium reduction treatment, so that the silicon carbon in the silsesquioxane-based nitrogen-doped silicon-carbon composite anode material prepared by the invention can be uniformly distributed, thereby allowing the lithium ion battery based on the silsesquioxane-based nitrogen-doped silicon-carbon composite anode material prepared in the invention to have the high specific capacity and cycle stability.

The invention belongs to the field of lithium ion batteries and provides a lithium ion battery anode material Li2Mn1-xMgxSiO4/C and a preparation method thereof, wherein x is larger than or equal to 0 and smaller than or equal to 0.1. The defect of poor electrochemical performances of an existing lithium ion battery anode material Li2MnSiO4 can be overcome. Electronic conductivity of the material can be improved by carbon compounding, and by doping of positive ions, the material can be stabilized structurally, cycle stability of the material is improved, and specific discharge capacity and cycle stability of the material are improved remarkably. In addition, by adoption of a sol-gel method for preparation of the material Li2Mn1-xMgxSiO4/C, a prepared product has advantages of high crystallization quality, high chemical uniformity, particle fineness, high purity and suitableness for industrial production.

The invention discloses a silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material, wherein the chemical expression is LinNiaCobSi(c-x)TixO(2-m)Fm; wherein 1 <= n <= 1.2, a+b+c=1, 0.00001 <= c/(a + b) <= 0. 1, x < c, 0 < m < 0.1; The invention also discloses a preparation method of the positive electrode material. As that positive electrode material of the invention is dopewith silicon, titanium and fluorine, the structural stability and safety of the positive electrode material are effectively improved, and the cycle life of the positive electrode material is prolonged; At first, that silicon source, Titanium source and fluorine source are premixed with Ni-Co composite precursor at ultra-high speed, and then lithium source and the mixture are further mixed at highspeed, which effectively improves the effect of uniform doping of silicon, titanium and fluorine in Ni-Co composite precursor, and also improves the cycle performance and discharge specific capacity of lithium nickel cobalt oxide battery.

The invention discloses a high-nickel positive electrode-lithium carbon negative electrode lithium ion battery and a preparation method thereof, the lithium ion battery comprises a positive electrodeplate, a negative electrode plate, a ceramic diaphragm, an electrolyte and a battery shell, the positive electrode plate, the ceramic diaphragm, the negative electrode plate and the ceramic diaphragmare sequentially and repeatedly laminated to form a dry battery cell; the lithium ion battery is prepared by putting a dry battery cell into a battery shell, injecting electrolyte, opening for formation, sealing and grading capacity, and is characterized in that a positive plate and a negative plate are respectively a multi-element high-nickel positive plate and a lithium-carbon composite negativeplate, positive plate reserved tabs are arranged on the front surface and the back surface of the positive plate, and negative plate reserved tabs are arranged on the front surface and the back surface of the negative plate; through application of preferred materials and optimization of the process technology, the mass energy density of the prepared lithium ion battery reaches 350 wh/kg or above,and the lithium ion battery is very suitable for application in the fields of 3C, power, energy storage and the like.

A lithium-sulfur battery electrolyte comprises lithium salt, organic solvents and a tellurium organic additive, wherein the molarity of the lithium salt ranges from 0.1mol/L to 3mol/L, the molarity ofthe tellurium organic additive ranges from 0.01mol/L to 0.2mol/L, and the remaining part is the organic solvents. A preparation method of the electrolyte comprises the steps that 1, the required organic solvents are mixed according to proportion in a glove box inflated with argon gas, a basic solution is obtained after uniform mixing, and the content value of water and the content value of oxygenin the glove box are both smaller than 1ppm; 2, the lithium salt dried in a vacuum drying oven is added into the basic solution according to a required ratio for mixing, and a basic electrolyte of alithium-sulfur battery is obtained after uniform mixing, wherein the molarity of the lithium salt ranges from 0.1mol/L to 3mol/L; and 3, the tellurium organic additive is added into the basic electrolyte for mixing, and the lithium-sulfur battery electrolyte is obtained after uniform mixing, wherein the molarity of the tellurium organic additive ranges from 0.01mol/L to 0.2mol/L.

The invention discloses a non-stoichiometric lithium iron manganese phosphate positive electrode material as well as a preparation method and application thereof. The lithium iron manganese phosphate positive electrode material has a chemical general formula of Li < 1 + 2x > (FeMn) < 1-x > PO4/C, wherein x is greater than 0.015 and less than 0.035. The method comprises the steps of mixing lithium dihydrogen phosphate, ferrous oxalate, manganese carbonate, lithium carbonate, cane sugar and polyvinyl alcohol, ball-milling, centrifuging and drying to obtain a precursor; and heating in an inert atmosphere and calcining to obtain the non-stoichiometric lithium iron manganese phosphate positive electrode material. According to the method, a non-stoichiometric ratio method is adopted, the total number of cation valences is kept unchanged, other ions are not doped, and the material is doped with a small amount of lithium. According to the method, lattice parameters of the positive electrode material can be regulated and controlled, the particle sizes of primary and secondary particles are reduced, a small quantity of second-phase ionic conductors are generated, and the electrochemical performance of the material is synergistically improved. The method is low in raw material cost, simple in process and convenient for large-scale production.

The invention relates to the technical field of lithium batteries, in particular to a coated ternary precursor, a preparation method thereof and a positive electrode material comprising the coated ternary precursor, and the preparation method of the coated ternary precursor comprises the following steps: dissolving the ternary precursor in water in the presence of a solubilizer to obtain a precursor solution; dissolving a metal salt in an alcohol compound to obtain a coating solution; and mixing the coating solution and the precursor solution to realize wet hydrolysis coating, and then carrying out solid-liquid separation, water washing and vacuum drying to obtain a coated ternary precursor with the surface coated with metal hydroxide, so that the lattice defects and structure problems of the ternary precursor material are fundamentally improved, and the stability of the ternary precursor is greatly improved; and the occurrence of microcracks is avoided, and the obtained lithium battery has good cycle performance and relatively high specific discharge capacity.

The present invention provides a preparation method of a cathode of a lithium-sulfur battery. The method comprises the steps of: dispersing sulfur on the surface of a conductive agent to prepare a sulfur-conductive agent compound; mixing the sulfur-conductive agent compound with conductive carbon black and a binder to prepare a sulfur electrode; and preparing a layer of Ti4O7 film on the surface of the sulfur electrode through adoption of a coating deposition method to prepare a conductive layer-sulfur positive electrode. The method comprises the following steps of: (1) preparing a sulfur-conductive agent compound; (2) preparing a sulfur electrode; and (3) preparing a conductive layer-sulfur electrode. According to the method, sulfur is uniformly dispersed on the surface of the conductiveagent, the contact area of sulfur and the conductive agent is increased, and the conductivity of sulfur is improved. After the sulfur electrode is prepared, a conductive Ti4O7 layer is prepared on thesurface of the sulfur electrode through adoption of a coating deposition method, and the Ti4O7 layer is used for preventing an intermediate product lithium polysulfide from being dissolved in an electrolyte, so that the loss amount of active substances is reduced, the structure of the sulfur electrode is stabilized, and the specific discharge capacity and the cyclic discharge stability of the sulfur electrode are improved.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a carrier material for a positive electrode of a lithium-sulfur battery and a preparation method of the carrier material. The carrier material is an Nb-Nb4N5 composite material with a one-dimensional mesoporous nanobelt array, and the specific discharge capacity, the cycling stability, the rate capability and the cycle life of the lithium-sulfur battery can be remarkably improved when the carrier material is used for the positive electrode of the lithium-sulfur battery.

The invention relates to a ternary electrolyte containing an aromatic ring structure and preparation and application thereof, the electrolyte comprises boron trifluoride salt represented by the following general formula I, the boron trifluoride salt is a six-membered aromatic ring, and the ring is directly or indirectly connected with three-OBF3Ms; in I, R1, R2, R3, R4, R5 and R6 can be independently C, N, P, S, O, Se, Al, B or Si; m is a metal cation; e4 is a chain without or containing at least one atom; the-E2-OBF3M is connected to the R1, the R2, the R3, the R4, the R5, the R6 or the E4; e1, E2 and E3 are independently null, a chain structure containing at least one atom or a structure containing a ring; and R7 is a substituent group. The boron organic compound can be used as an additive in a battery, and can be used as a single-ion conductor and a high-molecular framework after being polymerized for a polymerizable monomer; the composite material can be applied to a liquid battery, a mixed solid-liquid battery, a semi-solid battery, a gel battery, a quasi-solid battery and an all-solid battery, and the effect is good.

The invention discloses a preparation method of a lithium iron phosphate positive electrode of a lithium ion battery, which comprises the following steps: making an iron source, a lithium source, a phosphorus source and a carbon source in a mass ratio of (0.92-1.08):(1-1.22):(1.15-1.36 ): (1.10~1.56) Add to distilled water and stir to dissolve, add complexing agent dropwise and stir and let stand for 10~15h; place copper foil in a container with distilled water, ultrasonicate for 2~3h, take out and dry, use After grinding with 600-800-mesh sandpaper, place it in distilled water and anhydrous ethanol solution for 1-2 hours respectively, and then sonicate for 1 to 2 hours. The product in step S1 is moved to an electrospinning device, and the spun silk is received in step S2. On the copper foil in the middle, a layer of lithium iron phosphate fiber film is obtained on the copper foil after spinning, and placed in a tube furnace. , and kept at this temperature for 2 to 4 hours, then cooled naturally, took out the copper foil, added N-methylpyrrolidone, binder PVDF and conductive agent Super-C dropwise, and then added N-methylpyrrolidone dropwise again, vacuum drying oven The positive electrode is obtained by drying in the middle.

The invention relates to a saturated heterochain electrolyte and preparation and application thereof, the electrolyte comprises boron trifluoride salt represented by the following general formula I: in the general formula I, R or R1 is independently a first chain without or containing at least one atom; r and R1 are not none at the same time; r2 and R3 are second chains which do not contain or contain at least one atom; m is a metal cation; the first chain and the second chain are both saturated chains; h on any C in the first chain and the second chain can be independently substituted by substituent groups, and the substituent groups comprise H, a chained substituent group containing at least one atom and a cyclic substituent group; the first chain, the second chain and the chain substituent contain at least one heteroatom. According to the electrolyte disclosed by the invention, two-OBF3M are creatively compounded in one compound, so that the electrolyte can be used as an electrolyte salt and an additive, and the effect is good.

The invention relates to a polycyclic electrolyte and preparation and application thereof, the electrolyte comprises boron trifluoride salt represented by the following general formula I: wherein R represents a polyring, and the polyring is composed of two or more than two monorings; the multi-rings comprise a fused ring, a bridge ring and a spiro ring, and simultaneously contain at least two of the three multi-rings or simultaneously contain at least one single ring and at least one of the three multi-rings; m is a metal cation; e1 and E2 are independently null, a group, a chain structure or a ring-containing structure; according to the electrolyte disclosed by the invention, two-OBF3M are creatively compounded in a polycyclic compound, so that the polycyclic compound can be used as an electrolyte salt and an additive, and the effect is good.

The invention discloses a single-ion conductor polymer solid electrolyte membrane as well as a preparation method and application thereof. The single-ion conductor polymer solid electrolyte membrane comprises the following components in parts by weight of 5-50 parts of a lithium-containing monomer, 5-25 parts of a crosslinking monomer, 1-30 parts of a polymer, 0-20 parts of a plasticizer, 0-15 parts of inorganic particles and lithium salt, wherein the molar ratio of the lithium salt to the sum of lithium ion complexing dissociation groups in each component is 1: (1-16). The single-ion conductor polymer solid-state electrolyte membrane has higher ionic conductivity and lithium ion transference number, is simple in preparation process, and can be used for a solid-state lithium battery to reduce the concentration polarization, improve the specific discharge capacity and prolong the cycle life.

The present invention relates to a ternary electrolyte containing a linked ring salt and a preparation method and application thereof, the electrolyte comprises a boron trifluoride salt represented by the following general formula I: in the general formula I, R and R1 represent rings, and the rings comprise a single ring and a multi-ring composed of at least two single rings; e8 is none, a chain containing at least one atom or a ring-containing structure; m is a metal cation; e4 is a chain without or containing at least one atom; -E3-OBF3M is connected to any one atom of E4, E8, R or R1; e1, E2 and E3 are independently null, a chain structure containing at least one atom or a structure containing a ring; r'and R1 'are independently substituent groups, three-OBF3M groups exist in the structure of the boron trifluoride salt, and preferably-OBF3M is connected with a carbon atom C. The boron trifluoride salt can be applied as an additive in a battery, and the electrolyte can be applied to a liquid battery, a mixed solid-liquid battery, a semi-solid battery, a gel battery, a quasi-solid battery and an all-solid battery and has a good effect.

The invention relates to a saturated heterochain ternary electrolyte as well as a preparation method and application thereof. The electrolyte comprises a saturated heterochain boron trifluoride salt represented by the following general formula I, wherein R, R1 or R4 are independently a first chain without or containing at least one atom; r, R1 and R4 are not none at the same time; any one atom of R, R1, R2, R3 or R4 is connected with-R5-OBF3M, and-R5-OBF3M is connected to any one atom of R, R1, R2, R3 or R4; r2, R3 or R5 are independently a second chain free of or containing at least one atom; m is a metal cation; the first chain and the second chain are both saturated chains; h on any C in the first chain and the second chain can be independently substituted by a substituent, and the first chain, the second chain and the chain substituent contain at least one non-carbon heteroatom. The boron trifluoride salt can be used as an additive in a battery, can be applied to a liquid battery, a mixed solid-liquid battery, a semi-solid battery, a gel battery, a quasi-solid-state battery and an all-solid-state battery, and has a good effect.

The invention relates to an unsaturated carbocyclic boron trifluoride salt electrolyte as well as preparation and application thereof. The electrolyte comprises boron trifluoride salt represented by the following general formula I, r'represents a carbocyclic ring composed of carbon and is an unsaturated carbocyclic ring containing at least one double bond; m is a metal cation; e1 and E2 are independently null, a group, a chain structure or a ring-containing structure; r is a substituent group and represents that any H on a ring can be substituted by the substituent group, the substituent group can replace one H or two or more H, and if two or more H are substituted, the substituent groups can be the same or different. The boron organic compound has multiple effects, can be used as an electrolyte lithium/sodium salt, an additive and a polymeric monomer, and has a good effect.

The invention relates to an unsaturated carbon chain sulfur-based electrolyte and a preparation method and application thereof, the electrolyte comprises the following general formula I: in the general formula I, R or R1 is independently null or a first chain; r2 and R3 are independently null or a second chain; m is a metal cation; the first chain and the second chain are carbon chains; substituent groups can be connected to the first chain and the second chain; the first chain, the second chain and the chain substituent at least contain one unsaturated bond. The boron trifluoride salt can be used as an additive and a salt in an electrolyte, and can be used as a single-ion conductor polymer electrolyte and a high-molecular skeleton after being polymerized for a polymerizable monomer. The boron trifluoride salt provided by the invention can be applied to a liquid battery, a mixed solid-liquid battery, a semi-solid battery, a gel battery, a quasi-solid-state battery and an all-solid-state battery, and is beneficial to improving the energy density and the cycle stability of the battery and prolonging the service life of the battery. The raw materials are low in price, the synthesis process is simple, and good economic benefits are achieved.