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

A lithium-ion battery and battery electrode technology, which is applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as complicated procedures, and achieve the effects of convenient transportation, increased specific capacity, and high specific capacity

Inactive Publication Date: 2016-04-13
ZHONGTIAN ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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,

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Electrode sheet preparation: the positive electrode sheet is made of LiNiCoMnO 2 The ternary material is used as the positive electrode active material, and then the conductive paste containing graphene is added, the positive electrode slurry is prepared by using PVDF as the binder, and NMP is used as the solvent, and then the porous aluminum foil is used as the current collector to coat the positive electrode sheet; the negative electrode The sheet uses silicon oxygen carbon material SiO-C as the negative electrode active material, then adds Sp conductive powder, uses CMC and SBR as the binder, and uses deionized water as the solvent to prepare the negative electrode slurry, and then uses porous copper foil as the current collector. Covered with a negative electrode. Cut the above positive and negative electrode sheets to a size suitable for winding 18650 battery cores.

[0029] Negative plate pre-doped with lithium: prepare a 0.25mol / L naphthalene solution, the solve...

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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-...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/48H01M4/66
CPCH01M4/1391H01M4/48H01M4/505H01M4/525H01M4/66Y02E60/10
Inventor 贺劲鑫靳承铀薛驰缪永华薛群山
Owner ZHONGTIAN ENERGY STORAGE TECH
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