9results about How to "Electrochemical stability" patented technology

The invention discloses a positive electrode lithium supplementing agent, a positive electrode plate, a secondary battery and a power utilization device, and belongs to the technical field of batteries, the positive electrode lithium supplementing agent comprises lithium phytate and a lithium supplementing agent, and the lithium supplementing agent comprises at least one of Li5FeO4, Li6CoO4 and Li2NiO2. The lithium phytate and the lithium supplementing agent are combined to serve as the positive electrode lithium supplementing agent, the lithium phytate and the lithium supplementing agent act together, active oxygen and metal ions released by the lithium supplementing agent are adsorbed, side reactions of the electrolyte are reduced, the electrochemical stability of a system is maintained under high voltage, meanwhile, lithium can be completely released under a high-voltage lithium cobalt oxide system, and the service life of the lithium battery is prolonged. The release amount of a lithium source is effectively increased, the lithium consumption of a negative electrode SEI film forming reaction is fully supplemented, the embedding and separating process of lithium ions in a positive electrode material is promoted, the gas expansion of the secondary battery is improved, and the cycle life of the secondary battery is effectively prolonged.

The invention relates to the technical field of secondary batteries, in particular to a dry-method electrode binder, a preparation method of the dry-method electrode binder and an electrode slice, and the dry-method electrode binder comprises the following active ingredients in parts by weight: 0.1-20 parts of a functional nano carbon material; 1 to 40.0 parts of ethylenically unsaturated carboxylic acid; 1 to 50.0 parts of an unsaturated water-soluble monomer; 1 to 80.0 parts of an unsaturated oil soluble monomer; 0.1 to 20.0 parts of an emulsifier; 0.1 to 10.0 parts of an initiator; and 1 to 40.0 parts of a pH regulator. According to the dry-method electrode binder provided by the invention, the acrylic acid copolymer is grafted on the functionalized nano carbon material, so that the binder adopts an acrylic acid structure of a saturated carbon chain and is electrochemically stable in low potential of a negative electrode, and the problems that the potential of PTFE (Polytetrafluoroethylene) in the negative electrode is unstable, lithium in a battery is consumed, and the adhesion effect and the battery capacity are influenced are solved.

The invention discloses modified garnet ceramic powder, a PVDF (polyvinylidene fluoride)-based composite solid electrolyte, a solid-state battery as well as a preparation method and application of the solid-state battery. The modified garnet ceramic powder comprises ceramic powder and a modified interface layer coating the outer side of the ceramic powder, the thickness of the modified interface layer is 4-8 nm; the ceramic powder is garnet ceramic electrolyte powder; the modified interface layer is a polymer film polymerized on the surface of the ceramic powder; and the polymer film is made of polycyanoethyl cellulose. According to the modified garnet ceramic powder, cyanoethyl cellulose and a garnet ceramic electrolyte are coordinated and polymerized, so that the interface structure of garnet and a PVDF-based polymer is regulated and controlled, side reactions are inhibited, interface contact is better, electrochemical stability is achieved, ion transmission is faster, and the comprehensive performance of the composite electrolyte is improved.

The invention discloses a quasi-solid electrolyte, a preparation method and application thereof and a button cell. The electrolyte contains a cyclodextrin cross-linked nitrile-containing polymer, an electrolyte and an inorganic pore-forming agent. The tensile strength of the quasi-solid electrolyte is 2-3 MPa, the stretch rate is 30-80%, the ionic conductivity is 1-5 mS / cm, and the quasi-solid electrolyte is electrochemically stable within the voltage range of 1-4.6 V. The quasi-solid electrolyte provided by the invention is used as a gel electrolyte to assemble a quasi-solid lithium / sodium ion battery, and has the advantages of high mechanical strength, good tensile property, high ionic conductivity and good electrochemical stability window.

The utility model provides a novel multi-term extraction system for polluted soil and underground water. The novel multi-term extraction system comprises an extraction well, an extraction device, a spraying device, an oil-water separator and an oxidation-reduction treatment unit, the extraction device comprises a gas-liquid separator, a separation cavity used for installing the gas-liquid separator is formed in the extraction well, the gas-liquid separator comprises a gas-liquid separator shell, a liquid phase extraction pipe, an extraction pump and a gas phase overflow pipe, the lower end of the liquid phase extraction pipe is arranged at the bottom of the gas-liquid separator, and the lower end of the extraction pump is arranged at the bottom of the gas-liquid separator. The liquid-phase extraction pipe is provided with the extraction pump, the lower end of the gas-phase overflow pipe is communicated with the top of the gas-liquid separator shell, the gas-phase overflow pipe is connected with the spraying device, the liquid-phase overflow pipe is connected with the oil-water separator, the water-phase output end of the oil-water separator is connected with the oxidation-reduction treatment unit, and the water-phase output end of the oxidation-reduction treatment unit is connected with the water-phase output end of the oil-water separator. And the oxidation-reduction treatment unit is connected with the spraying device. The in-situ remediation device is used for in-situ remediation of underground water.

The application discloses a preparation method of a titanium carbide doped polymer solid electrolyte, which can effectively reduce the crystallinity of PEO, enhance the ionic conductivity of the polymer solid electrolyte and widen the electrochemical window by grafting PCL (polycaprolactone) on the surface of a two-dimensional material titanium carbide (MXene) and blending the PCL with a PEO (polyethylene oxide) blend.The steps adopted by the application are as follows: firstly, PCL is grafted on the surface of MXene through a one-pot method; then, the grafted material is mixed with PEO and LiTFSI (lithium bis(trifluoromethanesulfonyl)imide) in a certain proportion, is subjected to ultrasonic oscillation and is uniformly mixed by heating; finally, the solution is poured on a glass culture medium, the solvent is volatilized at room temperature, the solvent is removed by heating, and a solid polymer electrolyte film is obtained.The polymer solid electrolyte film prepared by the method of the application has good mechanical properties, high ionic conductivity, a wide electrochemical stability window, stable charge and discharge processes of an assembled battery and excellent cycle performance.

This invention discloses an aluminum-containing heavy water-based electrolyte, its preparation method, and its applications. The electrolyte comprises a solvent and a solute. The solvent includes heavy water, a deuterated solvent, and a low-barrier hydrogen bond reconstructing agent. The solute comprises a main aluminum salt and an auxiliary monovalent metal salt. This electrolyte can construct low-barrier hydrogen bonds in solution by controlling the solvent composition, significantly reducing the activity of water in the solution, improving the electrochemical stability of the solution, and suppressing side reactions. Simultaneously, it improves the electrochemical reaction behavior of aluminum in the solution and at the electrolyte / electrode interface, which is beneficial for improving the electrochemical deposition efficiency of aluminum in aqueous solution.

The invention provides a solid electrolyte and a preparation method thereof, and a secondary battery and device containing the solid electrolyte, the solid electrolyte comprises a polymer, a lithium salt and an inorganic ceramic filler; the inorganic ceramic filler comprises a first filler and a second filler; based on the total mass of the solid electrolyte, the mass content of the first filler is A%, and the mass content of the second filler is B%; wherein 5 < = A < = 50; 0 < = B < = 25; 5 < = A + B < = 50; 0% < = B / A < = 100%. The solid electrolyte is excellent in ionic conductivity, stable in chemical and electrochemical performance, excellent in mechanical strength, low in preparation cost, simple and convenient in manufacturing process and easy to produce on a large scale.

The present invention relates to a non-fibrillar binder for a dry coated electrode, the binder consisting of a fluoropolymer having a melting point of between 145 DEG C and 200 DEG C as measured according to ASTM D3418, and a melt viscosity of less than 50 kP as measured according to ASTM D3835 at 230 DEG C and at a shear rate of 100 s-1. More specifically, the present invention relates to a dry coated electrode for a lithium ion battery. The invention also relates to a lithium ion battery manufactured by incorporating said electrode.