Lithium pre-doping method for electrode plate of lithium-ion battery

Abstract

The invention discloses a lithium pre-doping method for an electrode plate of a lithium-ion battery. Lithium pre-doping of the battery electrode plate can be finished through a solution preparation step, an electrode plate soaking step, a washing step and a drying step. The lithium pre-doping method has the advantages that lithium for pre-doping is directly catalyzed in the electrode plate; and compared with an existing electrochemical doping method, the lithium pre-doping method is relatively simple and convenient. The lithium pre-doping method is free of a specific limitation on the electrode plate; a positive electrode and a negative electrode can be simultaneously pre-doped with lithium; and the doping efficiency is improved. A porous foil is adopted by a current collector of the electrode plate disclosed by the invention, transportation of lithium ions is facilitated; the doping time is shortened; and meanwhile, the specific capacity of the electrode plate is increased. The battery prepared by lithium pre-doping has the advantages of high output voltage and high specific capacity, so that the battery has relatively high energy density.

Description

technical field [0001] The invention belongs to the field of electrode material preparation and energy storage devices, in particular to a [0002] A method for pre-doping lithium on an electrode sheet of an ion battery. Background technique [0003] Lithium-ion secondary batteries currently commercially used mainly use LiCoO 2 , LiMn 2 o 4 、LiFePO 4 etc. as the representative metal oxide cathode materials and graphite-based anode materials. The increasing demand for lithium batteries with high capacity or energy density has prompted people to optimize and improve battery materials, battery structures, and manufacturing processes. However, the optimization of the specific capacity of positive electrode oxides and negative electrode graphite materials has almost reached the theoretical value, which is difficult to meet the needs of high energy density batteries. In order to solve this problem, in addition to developing new positive and negative electrode materials, pre-...

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Problems solved by technology

This technology is effective in coin cells with a small number of electrodes and relatively thick electrodes, but in stacked-type batteries or wound-type batteries with multiple electrodes, the process is too complicated, and it is difficult to deal with thin lithium metal, etc. There are problems in this aspect, and a more convenient and practical pre-doping method is needed

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