Method for reducing metal and alloy hydroxide gel by hydrogen separated from electrochemistry cathode

Abstract

The present invention discloses a method for reducing metal hydroxide gel and metal hydroxide-carbon gel and alloy gel and alloy hydroxide-carbon gel through electrochemical cathodic hydrogen evolution in potassium chloride aqueous solution, and directly further forming and preparing electrode materials of metal and metal-carbon and alloy and alloy-carbon. The electrode prepared by the method can obtain composition of metal: carbon or alloy: carbon with definite proportion, thereby the electrode composition is stable. The tin-carbon gel and tin-cobalt-carbon gel of the present invention is prepared by a definite proportion chemical precipitation method, and overcomes the disadvantage that the coating element content can not be accurately controlled if an electrochemical deposition method is adulterated. The experimental battery consisting of the tin-carbon anode and the lithium sheet cathode prepared with the process has 20 times circulation time and specific capacity of up to 327.4 mAh / g under 0.2 C charging and discharging current; the prepared experimental battery consisting of the tin-cobalt-carbon anode and the lithium sheet cathode has 50 times circulation time specific capacity of up to 278.5 mAh / g under 0.3 C charging and discharging current.

Description

(1) Technical field: [0001] The present invention relates to a kind of electrode material, specifically, refers to a kind of metal hydroxide gel and metal hydroxide-carbon gel and alloy hydroxide gel that use electrochemical cathodic hydrogen evolution reduction in potassium chloride aqueous solution And alloy hydroxide-carbon gel, a method for preparing metal and metal-carbon and alloy and alloy-carbon electrode materials by one-step molding directly on the copper foil current collector. (2) Background technology: [0002] Carbon-doped metals or alloys are used as electrode materials, and their preparation methods include mechanical alloying, sputtering, and electrochemical deposition. The mechanical alloy method takes a long time to prepare, and it is difficult to obtain nano-sized particles; the sputtering method is controlled by the size of the studio, and it is difficult to be used in the actual production line; although the electrochemical deposition method can deposit...

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Problems solved by technology

The mechanical alloy method takes a long time to prepare, and it is difficult to obtain nano-sized particles; the sputtering method is controlled by the size of the studio, and it is difficult to be used in the actual production line; although the electrochemical deposition method can deposit nano-sized material structures, the coating is doped. Carbon is composed of carbon particles in the electrolyte and electrodeposited metal or alloy through inclusion compounding. It is difficult to accurately control the content and distribution of carbon particles in the coating, which directly affects the reproducibility of electrode material performance.

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