4results 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 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.