Preparation method of organic pre-lithiated material

An organic and organic technology, applied in the field of preparation of organic pre-lithiation materials, can solve problems such as unfavorable industrial production, complex process, gas production from electrolyte decomposition, and achieve easy mass production, high specific capacity for delithiation, and lithium intercalation. Bit suitable effect

Active Publication Date: 2020-05-08
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method of organic pre-lithiated material
  • Preparation method of organic pre-lithiated material
  • Preparation method of organic pre-lithiated material

Examples

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Effect test

Embodiment 1

[0040] Synthesize and prepare 3-methylcatechol material according to the method reported in the literature, take 10mmol of 3-methylcatechol and add it to 100ml of anhydrous toluene, stir evenly, cool the solution to -20°C, and argon Pump and change the air three times, slowly add 24 mmol of lithium diisopropylamide solution to the above solution dropwise under an argon atmosphere, after the addition of lithium diisopropylamide is completed, slowly raise the temperature to 0°C, and set the temperature at 0°C Fully stir the reaction for 6 hours; add excess n-hexane to the above reaction solution, filter to obtain a solid powder product, then use a mixed solvent of n-hexane / tetrahydrofuran with a volume ratio of 1:3 to fully wash the solid powder, repeat three times, and remove impurities. The resulting solid powder was placed in a vacuum drying oven and dried in vacuum at 140°C for 12 hours to obtain the final positive electrode organic pre-lithiated material product 3-methyl-1,2...

Embodiment 2

[0043] Synthesize and prepare 2-nitrophloroglucinol material according to the method reported in the literature, take 15mmol of 1-nitro-2,4,6-triphenolylbenzene and add it to 150ml of anhydrous tetrahydrofuran, stir evenly, and cool the solution To 0°C, argon gas was pumped three times, and 47.25mmol of lithium hydride powder was slowly added dropwise to the above solution under an argon atmosphere. After the addition of lithium hydride was completed, the temperature was slowly raised to 25°C, and fully stirred at 25°C React for 36 hours; add excess n-hexane to the above reaction solution, filter to obtain a solid powder product, then use a mixed solvent of n-hexane / tetrahydrofuran with a volume ratio of 2:1 to fully wash the solid powder, repeat three times, and remove impurities. The resulting solid powder was placed in a vacuum drying oven and dried in vacuum at 50°C for 48 hours to obtain the final positive electrode organic pre-lithiated material product 1-nitro-2,4,6-trip...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/06
CPCH01G11/50H01G11/06
Inventor 倪旺宗军刘胜男宁凡雨任丽彬丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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