Method for producing hydrogen by recycling waste lithium ion battery positive electrode material in combination with electrochemistry

Abstract

A method for producing hydrogen by recycling a waste lithium ion battery positive electrode material in combination with electrochemistry comprises the steps of (1) ball-milling, sieving and drying the waste positive electrode material to obtain recycled powder of secondary agglomerated particles of the waste positive electrode material; (2) mixing the recycled powder of the secondary agglomeratedparticles of the waste positive electrode material with a conductive agent and an adhesive, coating and drying to obtain a pole piece; (3) taking the pole piece as a positive electrode and an inert electrode as a negative electrode, and charging in an electrolyte solution; (4) after the reaction is finished, collecting primary particles of the waste positive electrode material on the positive electrode plate; and (5) mixing the primary particles of the waste positive electrode material serving as a precursor with lithium salt, and performing high-temperature calcination to obtain the positiveelectrode material. According to the method disclosed by the invention, organic combination of waste positive electrode material recovery, positive electrode material primary particle synthesis, electrochemical hydrogen production and high-performance positive electrode material re-preparation is realized by a simple, efficient and environment-friendly method with relatively low treatment cost.

Description

technical field [0001] The invention relates to the recycling of waste lithium-ion batteries and a method for electrochemically producing hydrogen, in particular to a method for recycling waste lithium-ion battery anode materials combined with electrochemical hydrogen production. Background technique [0002] "Reuse of waste materials" is a new topic accompanied by the rapid consumption of natural resources and the rapid increase of waste materials. It is predicted that by 2030, the world's scrapped lithium-ion batteries will reach more than 11 million tons. In contrast, only less than 5% of discarded batteries can be recycled. If the waste battery is not properly resolved, it will not only be harmful to the healthy development of human beings, but also destroy the natural ecological environment. Heavy metals such as Co, Mn, and Ni can severely damage soil and groundwater, electrolytes (mainly LiPF 6 ) and water molecules in the air to produce harmful hydrogen fluoride gas...

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Problems solved by technology

[0004] At present, the common technologies for recycling waste lithium-ion battery cathode materials are heat treatment for lithium supplementation, hydrothermal treatment for lithium supplementation to prepare new cathode materials, or fire or wet delithiation of waste cathode materials, and then the obtained nickel-cobalt-manganese Compounds are used as precursors to prepare new positive electrode materials, but the new positive electrode materials prepared by these methods are difficult to achieve the expected target in terms of electrochemical performance and the processing cost is high

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