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

A hydroxide, electrochemical technology, applied in the direction of alkaline battery electrodes, electrolytic coatings, coatings, etc., can solve the problem of difficult to accurately control the content and distribution of carbon particles in the coating, affecting the reproducibility of electrode material performance, mechanical alloying In order to solve the problems of long preparation time and other problems, it achieves the effects of excellent cycle performance, controllable shape and low cost.

Inactive Publication Date: 2008-03-19
BEIHANG UNIV
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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.

Method used

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

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with examples.

[0039] The present invention is a method of preparing metal hydroxide gel, metal hydroxide-carbon gel, alloy hydroxide gel and alloy hydroxide-carbon gel by using fixed ratio chemical precipitation method, which can be directly reduced by subsequent cathode hydrogen evolution reduction. A method for preparing metal and metal-carbon and alloy and alloy-carbon electrode materials by one-step molding on a copper foil current collector. This method comprises the following steps:

[0040] The first step: prepare metal hydroxide gel or metal hydroxide-carbon gel or alloy hydroxide gel or alloy hydroxide-carbon gel by fixed ratio chemical precipitation method,

[0041] First prepare the solution to prepare the gel:

[0042] 1. The solvent is distilled water or deionized water, the solute is tin chloride or tin sulfate, the concentration is 0.01~5mol / L, mol means mole, L means lite...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00H01M4/29
CPCY02E60/124Y02E60/10
Inventor 于维平
Owner BEIHANG UNIV
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