Preparation method of organic pre-lithiated material

Abstract

The invention belongs to the field of lithium batteries, and particularly relates to a preparation method of an organic pre-lithiated material. The preparation method of the organic pre-lithiated material comprises the following steps: 1. weighing a certain amount of aromatic cyclic phenol organic matters, dissolving in an anhydrous organic solvent, stirring to dissolve to obtain a uniform solution, slowly adding a lithium salt into the uniform solution, and carrying out stirring reaction; and 2, adding n-hexane into the reaction solution, filtering to obtain solid powder, washing with an n-hexane / tetrahydrofuran mixed solvent, repeating for three times, and drying the obtained solid powder to obtain the final positive electrode organic pre-lithiation material product. The preparation method of the organic pre-lithiated material provided by the invention has the advantages that the structure is adjustable, the lithium intercalation potential is proper, the organic pre-lithiated material can be directly doped into a positive electrode, and the safety is good.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a method for preparing an organic pre-lithiated material. Background technique [0002] Existing techniques and drawbacks: [0003] As a new type of chemical energy storage device that is currently developing rapidly, lithium-ion capacitors combine the characteristics of traditional lithium-ion batteries and chemical supercapacitors. ), the negative electrode is a lithium-intercalated carbon material (such as graphite, hard carbon and soft carbon, etc.), its energy storage principle combines the characteristics of lithium-ion batteries and double-layer chemical capacitors, the positive electrode has ion surface adsorption and exchange reactions, and the negative electrode The intercalation and deintercalation of ions is extremely high, so the energy density is higher than that of electric double layer capacitors, and the power density is higher than that of lithium-ion batteries...

AI Technical Summary

Problems solved by technology

For the negative electrode pre-intercalation lithium technology, its advantages are: high efficiency of lithium supplementation, and no other ineffective components will be introduced. At the same time, its disadvantages are: poor safety, complex process, not conducive to industrial production, and thicker lithium is easy to be generated during the lithium intercalation process. SEI film is not conducive to the power characteristics of the device. For the electrolyte pre-embedded lithium technology, its advantages: good safety, simple process, and will not introduce redundant components into the electrode, its disadvantages: consume lithium ions in the electrolyte, reduce cycle stability and power characteristics

Its disadvantages: after lithium supplementation, insoluble by-products are introduced into the positive electrode, and the pre-lithiation potential is high (> 4.5V), and the pre-lithium process is likely to cause the electrolyte to decompose and produce gas, which is not conducive to the cycle life of the device

However, the existing lithium-rich metal oxide materials have the disadvantages of introducing insoluble by-products into the positive electrode after lithium supplementation, which affects the performance of the positive electrode, and the pre-lithiation potential is high (>4.5V), which is easy to cause side reactions in the electrolyte, etc.

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