16results about How to "Excellent long cycle performance" patented technology

The invention relates to the field of batteries, and discloses electrode slurry, a preparation method thereof, an electrode plate, a battery and an electric device. The electrode slurry comprises an electrode active material, a conductive agent, a binder, a plasticizer and a solvent, the binder comprises CMC (Carboxymethyl Cellulose), SBR (Styrene Butadiene Rubber) and a water-based binder, the water-based binder is an acrylic copolymer binder, and the SBR is a styrene, butadiene and acrylonitrile copolymer binder. The CMC, the SBR and the specific water-based copolymer binder are combined and applied to the electrode slurry, through matching with other components such as an active material and the like, the processing performance of the electrode slurry can be remarkably improved, for example, smooth sieving of the slurry, improvement of binding power, reduction of pole piece rebound and the like can be achieved, and meanwhile compared with slurry adopting a commercial binder, the service life of the electrode slurry is prolonged, and the service life of the electrode slurry is prolonged. And the long cycle performance of the battery can be improved, and the requirement of a high-performance battery can be further met.

The invention provides a graphite composite negative electrode material and a preparation method thereof, and a lithium ion battery, the graphite composite negative electrode material has a core-shell structure, and comprises a graphite core, a mesh conductive intermediate layer and a surface soft carbon coating layer; the raw materials of the net-shaped conductive middle layer comprise polyhydroxy benzene and metal salt, the raw material of the graphite inner core comprises natural graphite, and the raw material of the surface soft carbon coating layer comprises high-temperature coating asphalt; the mass ratio of the natural graphite to the polyhydroxy benzene to the metal salt to the high-temperature coated asphalt is 1000: (20-80): (20-80): (20-60). According to the invention, the natural graphite negative electrode material with high first-cycle coulombic efficiency, high rate capability and excellent long cycle performance can be prepared.

The application discloses a kind of miscellaneous anion oxyhalide solid electrolyte and preparation method, application and full solid battery thereof;Belong to solid battery technical field.The electrolyte material chemical formula is Li （3d+2e+2f+g） M m+ b N n+ c (PO4) d (SO4) e (CO3) f (OH) g X (mb+nc) , M is alkaline earth metal, N is one or more of transition metal, rare earth metal and P area metal, X is at least one of F, Cl, Br and I.The twisted Li-X sublattice structure formed by introducing halogen atom of the material of the application significantly reduces lithium ion migration barrier, expands lithium ion transport channel through special angle sharing oxygen network structure, also endows material with excellent mechanical flexibility, and the halogen-rich passivation layer spontaneously formed on the surface of the material makes it show excellent environmental stability;Not only solve the key material bottleneck of solid battery development, more provide solid technical support for promoting new energy industry to higher safety, higher energy density direction development.

The invention specifically discloses an electrolyte and a lithium ion battery. The electrolyte comprises an electrolyte for first injection and an electrolyte for second injection, the first injection electrolyte comprises a first solvent, a first additive and a first lithium salt; the first solvent comprises dimethyl carbonate, the first additive comprises vinylene carbonate and a composite additive, and the composite additive comprises at least one of fluoroethylene carbonate, ethylene sulfate and methylene methanedisulphonate; the mass ratio of the dimethyl carbonate is 45%-50%; the secondary injection electrolyte comprises a second solvent, a second additive and a second lithium salt; the second solvent comprises dimethyl carbonate, and the second additive comprises vinylene carbonate; the mass ratio of the dimethyl carbonate is 45%-50%; the mass ratio of the vinylene carbonate is 15%. The lithium battery has the advantages of high energy density and long cycle performance.

This invention discloses a method for preparing a composite solid electrolyte membrane that inhibits interfacial reactions, comprising the following steps: dissolving a fluorinated polymer and a lithium salt in N,N-dimethylformamide and stirring at 45-55°C to obtain solution A; ball-milling a garnet solid electrolyte to obtain a uniform dispersion, adding bicarbonate and stirring to obtain solution B, wherein the mass ratio of fluorinated polymer, lithium salt, garnet solid electrolyte, and bicarbonate is 0.4:0.6:1:0.15-0.25; adding solution B to solution A and stirring to obtain a uniform electrolyte slurry, transferring it to a glass petri dish, drying it first at 45-50°C with forced air, and then vacuum drying it at 110-120°C to obtain the composite solid electrolyte membrane. This invention introduces bicarbonate to improve the alkaline environment of the garnet solid electrolyte, achieving quantitative control of the interfacial reaction between the fluorinated polymer and the garnet solid electrolyte, and increasing the ionic conductivity to 10. ‑3 S cm ‑1 .

The application relates to a kind of NFPP nanosheet coated layered oxide positive electrode materials and its preparation method and application, and relates to the field of sodium ion battery;The preparation method of the NFPP nanosheet coated layered oxide positive electrode material comprises the following steps: dispersing layered transition metal oxide and sodium iron pyrophosphate nanosheet in solvent, adding F, N-containing complex carbon source after reaction;The mixture is annealed under the condition of inert atmosphere, 350-600 DEG C.The in-situ carbonization of the application is closely combined between NFPP and layered oxide, and a layered oxide composite positive electrode material with core-shell structure is formed.The contact between layered oxide positive electrode material and electrolyte is effectively avoided, and the occurrence of side reaction is reduced.The carbon-coated layer of NFPP is doped with fluorine and nitrogen elements, which can improve the conductivity and interface stability of the carbon-coated layer;The finally obtained layered oxide composite positive electrode material has good structural stability, excellent long cycle performance and excellent rate performance.

The application provides a kind of sodium ion battery negative electrode material and its preparation method and application.The negative electrode material includes black phosphorus, carbon carrier and sodium salt;The morphology of the carbon carrier is the morphology of LDH template;The black phosphorus and sodium salt are compounded in the carbon carrier;The carbon carrier is also doped with double metal ions, and the double metal is the double metal element in the LDH template.The negative electrode material provided by the application has multiple bonding effects between the carbon carrier, phosphoric acid, double metal ions and sodium salt, which ensures the stability of the material interface and effectively inhibits the volume expansion of black phosphorus during the cycle process;And the interaction between each substance, synergistic effect, makes the negative electrode material have excellent cycle stability and high reversible capacity, and also has good rate performance.

The invention belongs to the field of batteries, and particularly relates to a negative-electrode-free secondary battery, modified graphite, a modified current collector and a preparation method of the negative-electrode-free secondary battery, the modified graphite and the modified current collector, and the preparation method of the modified graphite comprises the following steps: carrying out hydrogen-argon mixed gas plasma modification treatment on graphite to prepare the modified graphite; the thickness of the graphite is 20 nm to 2 [mu] m, the diameter is 0.1 to 50 [mu] m, and the graphitization degree is more than 80%; the power of the hydrogen and argon mixed gas plasma modification treatment is 30-250 W, and the time is 2-25 min. The modification method provided by the invention can optimize the defects and the structure of the graphite surface, thereby constructing physicochemical characteristics adapted to the negative-electrode-free secondary battery, and further significantly improving the long cycle life of the negative-electrode-free secondary battery.

The present invention relates to a preparation method and application of a carbon-based cobalt single-atom material, which specifically comprises the following steps: 4 H 6 CoO 4 ·4(H 2 O) ground into powder, add phytic acid and stir thoroughly to obtain a purple sample, place the purple sample in an oven and continue to react it, take out the dry sample after the reaction is completed and put it into a tube furnace, raise the temperature in an inert gas and continue to react to obtain a black product, wash after taking it out, dry it, and obtain a black powder. The obtained black powder is placed in concentrated nitric acid, react overnight to react completely, wash, centrifuge to obtain a black substance, and dry it to obtain a carbon-based cobalt single-atom material. The carbon-based cobalt single-atom material prepared by the present invention, as the negative electrode material of potassium ion battery, not only shows good rate performance, but also its long cycle performance in current density is well improved. Therefore, this strategy of the present invention provides a good improvement method for carbon-based materials to improve potassium storage performance, which is of great significance in promoting potassium storage performance improvement of single-atom materials.

The invention provides a preparation method and application of a controllably constructed two-dimensional silicon dioxide nanosheet, and relates to the technical field of preparation of lithium ion battery negative electrode materials, and the preparation method comprises the three steps of preparation of transition metal oxide coated SiO2, preparation of the nanosheet and carbon coating modification. The two-dimensional SiO2 nanosheet is controllably constructed through a thermal cracking technology, the thickness of the obtained sheet structure is adjustable, and a liquid phase method from bottom to top provides possibility for large-scale production. The technology has expandability and flexibility required by commercialization, can be popularized to preparation processes of other two-dimensional nano materials, provides a new thought for controllable construction of a two-dimensional structure, and further, the two-dimensional structure can shorten the diffusion distance of ions and realize rapid transmission of Li < + >, and can be applied to preparation of the two-dimensional nano materials. In addition, aggregation or accumulation in the charging and discharging process can be effectively avoided, and an initial active surface and an open Li < + > transmission channel are kept.

The invention relates to the technical field of lithium ion batteries, and particularly discloses carbon-coated lithium iron phosphate and a preparation method thereof. Comprising the following steps: taking Prussian blue as a carbon source and an iron source, mixing a lithium source, a phosphorus source, Prussian blue and a dispersing agent in water, and performing ball milling to obtain a precursor; and calcining the precursor in a protective atmosphere to obtain the carbon-coated lithium iron phosphate. Prussian blue is used as an iron source and a carbon source at the same time, secondary sintering or additional carbon source adding is not needed, one-time sintering forming is achieved, the process is simple, and operation is easy. The carbon-coated lithium iron phosphate provided by the invention has excellent rate capability and long cycle performance, and can meet the requirements of high energy and high power output.

The invention discloses a gel polymer electrolyte based on a three-layer asymmetric gradient structure as well as a preparation method and application of the gel polymer electrolyte, and relates to the technical field of electrolyte materials of high-voltage lithium metal batteries. The gel polymer electrolyte comprises a three-layer structure of a cathode side layer, a middle layer and an anode side layer which are sequentially stacked, the three-layer structure takes polyvinylidene fluoride-hexafluoropropylene copolymer as a matrix and realizes functional partition through gradient doping of inorganic filler, and the inorganic filler is sodium niobate nanoparticles and gamma-Al2O3 particles; the components of each layer are accurately regulated and controlled, collaborative optimization of a lithium metal anode-electrolyte-high-voltage cathode interface and mechanical strength is realized, ohmic polarization and concentration polarization are reduced through a gradient structure, the ion transmission efficiency is improved, and the performance of the lithium ion battery is improved. The problems that an electrolyte in an existing high-voltage lithium metal battery is insufficient in electrode-electrolyte interface stability, poor in ion transport kinetics, weak in mechanical property, potential in safety hazard and the like are solved.

This invention provides a fast-charging lithium-ion battery electrolyte and a lithium-ion battery, belonging to the field of lithium-ion batteries. The fast-charging lithium-ion battery electrolyte comprises lithium bis(trifluoromethanesulfonyl)imide, lithium hexafluorophosphate, a fluorinated ether, and a non-aqueous solvent; the content of lithium bis(trifluoromethanesulfonyl)imide in the fast-charging lithium-ion battery electrolyte is greater than the content of lithium hexafluorophosphate. LiTFSI in the dual-salt system has a high thermal decomposition temperature and is insensitive to moisture, which can dilute the auxiliary salt concentration, reduce HF generation caused by moisture, reduce electrode corrosion, and improve electrode stability; TFSI... ‑ Large size, high electron delocalization, and similarity to Li + Low binding energy is beneficial to Li + Rapid dissociation and desolvation improve the rate performance of titanium niobate; the co-salt enhances interfacial stability, which is beneficial for improving the long-cycle performance of the battery; fluorinated ethers improve electrolyte wettability, further enhancing the rate performance of the battery.

The present application relates to the technical field of power batteries, and in particular to a positive electrode material and a preparation method thereof and a secondary battery. The positive electrode material comprises lithium iron manganese phosphate particles and a carbon coating layer coating the lithium iron manganese phosphate particles. The chemical formula of the lithium iron manganese phosphate particles is LiMn x Fe y PO4, wherein x:y=(0.4~0.8):(0.2~0.6), the difference between the maximum and minimum thickness of the carbon coating layer is between 1nm~2nm; and the positive electrode material is distributed with multiple pores, wherein the number of pores with a pore diameter exceeding 50nm accounts for 35%~50% of the total number of pores. The positive electrode material has a high compaction density and is conducive to the preparation of batteries with high discharge capacity and first efficiency and good long cycle performance.

The invention belongs to the technical field of carbon materials, and particularly relates to expanded graphite and a preparation method thereof. In order to improve the electrochemical performance displayed when the expanded graphite is currently applied to a supercapacitor, the method comprises the following steps: firstly, carrying out oil bath heating treatment on waste graphite by utilizing sodium nitrate, concentrated sulfuric acid and potassium permanganate, then carrying out oxidation intercalation treatment by utilizing hydrogen peroxide to obtain natural crystalline flake graphite, then washing and drying to treat the natural crystalline flake graphite into graphite oxide, and finally, preparing the expanded graphite into the supercapacitor. And finally, carrying out high-temperature expansion treatment to obtain the expanded graphite. The expanded graphite prepared by the method is used as an electrode material of a supercapacitor, the assembled supercapacitor shows excellent specific capacitance and excellent long cycle performance, and after 10000 cycles, the capacity retention ratio is greater than 80%.

The invention discloses a bromide ion electrooxidation electrode and a preparation method and application thereof. The preparation method comprises the following steps: providing a first deposition solution containing a surfactant, fluoride, a transition metal soluble salt and water; electrifying a first electro-deposition system comprising a first working electrode, a counter electrode and a first deposition solution, and performing first electro-deposition on the first working electrode to form a first electro-deposition layer; providing a second deposition solution comprising a surfactant, a transition metal soluble salt, and water; and electrifying a second electro-deposition system containing a second working electrode, a counter electrode and a second deposition solution, and carrying out second electro-deposition on the second working electrode to form a second electro-deposition layer so as to prepare the bromide ion electro-oxidation electrode. The bromide ion electrooxidation electrode provided by the invention is used for electrocatalytic oxidation of bromide ions, and can realize catalytic oxidation of low-grade bromide ions in brine.