81results about How to "Improve electrochemical reactivity" patented technology

The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a high-voltage lithium-ion battery electrolyte. The high-voltage lithium-ion battery electrolyte comprises non-aqueous solvent, lithium salt and an additive. The additive comprises the mixture of phosphonitrile, annular sulphate and hydrogen fluoroether. The high-voltage lithium-ion battery electrolyte can form a film on the surface of an electrode through the synergistic effect of the phosphonitrile, the annular sulphate and the hydrogen fluoroether, oxygenolysis of the electrolyte is restrained, and the cycle performance of 4.5 V and 5.0 V high-voltage lithium-ion batteries is obviously improved.

A negative active material for a rechargeable lithium battery, a method of preparing the negative active material, and a rechargeable lithium battery including the negative active material. The negative active material for a rechargeable lithium battery includes lithium titanium oxide (Li4Ti5O12) having a tap density of about 1.2 g / cc to 2.2 g / cc. The lithium titanium oxide is prepared by a mechano-chemical treatment and a heat treatment at a low temperature of about 650° C. to 775° C. According to the present invention, lithium titanium oxide having high crystallinity and tap density can be prepared through a simple and low-cost solid-phase method, e.g., a mechano-chemical treatment, and thus an electrode with excellent electrochemical reactivity and high energy density per volume can be fabricated.

The invention provides a carbon anode and a preparation method and an application thereof, and belongs to the technical field of carbon industries. The carbon anode comprises the following raw materials: 85-95 parts of aggregate and 5-15 parts of a binder. The preparation method comprises the following steps: mixing the raw materials according to a mass proportion, forming, and performing heat treatment, to obtain the carbon anode. The binder is capable of using liquid phenolic resin as a main body. Compared with a binder of asphalt, mixing in a normal temperature can be realized, a forming technology adopts compression molding, the technology is simple, and operation conditions are moderate. After the phenolic resin is used for heating and solidifying, the carbon anode has the characteristics of excellent dimensional stability, and is capable of realizing rapid warming in a roasting stage, shortening roasting time, and improving production efficiency.

Method for improving performance of direct sodium borohydride fuel cell, the technical scheme is that, at a temperature range of 293.15 to 313.15 K, adding ureophil or sodium oxalate into alkaline solution of sodium borohydride and mixing uniformly, then the mixture is used as electrolyte of direct sodium borohydride fuel cell, testing shows that electrochemical performance of the fuel cell is improved obviously. Direct sodium borohydride fuel cell according to the invention, the added ureophil or sodium oxalate into alkaline solution of sodium borohydride can inhibit hydrolysis of sodium borohydride effectively and overcome penetration of boron-hydrogen ion, and improve performace of direct sodium borohydride fuel cell.

The invention discloses a copper-cobalt-zinc composite self-supporting nano array electrode material and a preparation method and application thereof. The method comprises the following steps of oxidizing copper into copper hydroxide, washing and drying to obtain a linear array structure; soaking the linear array structure in a methanol solution containing metal ions, and enabling the metal ions to fully grow on the linear array structure; then placing in a methanol solution of 2-methylimidazole until a solid substance is changed from blue to purple, washing and drying to obtain a self-supporting structure @ZIF, wherein the metal ions are Co ions and Zn ions; and placing the self-supporting structure@ ZIF in an ethanol solution containing Co ions and Zn ions, and carrying out solvothermal reaction in a closed environment until the solid substance becomes gray from purple to obtain the electrode material. The electrode material has a highly ordered hollow nano array, a large number of defect holes exist in the surface of the nano array, more active sites and smooth electron transmission channels are provided for the catalytic process, and the electrode material can be used as a positive electrode and a negative electrode of a water electrolysis device.

The invention relates to the technical field of lithium-ion battery electrolytes, in particular to lithium-ion battery electrolytes with both high and low temperature performance, including: lithium hexafluorophosphate, mixed organic solvents, film-forming additives, additives for improving dielectric constant and low-temperature wetting ability, and lithium salts Type additives; mixed organic solvents include carbonate solvents and linear carboxylate solvents; linear carboxylate solvents in mixed organic solvents are ethyl propionate, n-propyl propionate, n-propyl acetate, n-butyl acetate and isobutyl acetate or a mixture of any two or more; the additives to improve the dielectric constant and low-temperature wettability are fluoroethylene carbonate, difluoroethylene carbonate and 4-trifluoromethylethylene carbonate one or a mixture of any two or more. The battery prepared by using the lithium-ion battery electrolyte with both high and low temperature performance has a long cycle life, and not only ensures that the battery has good low-temperature discharge performance, but also can effectively take into account the storage performance of the battery at a high temperature of 60°C.