Device and method for electrochemically preparing high-purity battery-grade lithium hydroxide

Abstract

The invention provides a device and a method for electrochemically preparing high-purity battery-grade lithium hydroxide. The device comprises two electrocatalytic electrodes and two separators, particularly an oxidation electrode (100), a hydrogen production electrode (200), an anion exchange membrane (300) and a cation exchange membrane (400); wherein the oxidation electrode (100) and the anionexchange membrane (300) form an anode tank; the hydrogen production electrode (200) and the cation exchange membrane (400) form a cathode tank; the device further comprises a lithium removal tank; thelithium removal tank is connected with the anode tank through the anion exchange membrane (300); and the lithium removal tank is also connected with the cathode tank through the cation exchange membrane (400). Compared with the prior art, the method and the device have the following technical effects: (1) electro-catalytic organic matter oxidation, electro-catalytic hydrogen evolution reduction and electro-lithium removal are combined for the first time; the whole system realizes simultaneous preparation of three products which are lithium hydroxide, hydrogen and acid.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and describes a device and method for electrochemically preparing high-purity battery-grade lithium hydroxide. The invention uses inorganic salt of lithium or its solution as raw material, utilizes hydroxide generated in the process of electrolyzing water to obtain lithium hydroxide, and combines protons generated with the anion in the raw material to obtain the corresponding acid. The electrolysis process uses a cationic membrane or an anionic membrane to selectively separate lithium ions and corresponding anions in the raw material. In the present invention, an organic substance that is easily oxidized electrochemically is used as a sacrificial agent, which reduces the electrolysis voltage and simultaneously obtains the corresponding protonic acid matching the raw material. Background technique [0002] As an important strategic resource, lithium metal is known as "the energy metal of the 21st ...

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Problems solved by technology

[0015] The present invention aims at the problem that the precipitation of chlorine gas may cause environmental pollution, and considers the use of an electrocatalytic organic oxidation electrode that is more likely to occur and does not produce polluting products, and uses the electro-oxidation reaction of low-molecular-weight organic matter to replace the oxidation reaction of chloride ions or Anodic oxygen evolution reaction, which avoids the generation of possible pollutants and can reduce the potential of the entire anodic oxidation reaction

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