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Preparation method of electrochemically active material

An active material, electrochemical technology, applied in the field of preparation of electrochemical active materials, can solve the problems of increasing the resistance of the material, reducing the conductivity, affecting the purity, etc., so as to solve the problem of conductivity and realize the effect of continuous production.

Active Publication Date: 2022-04-22
SUZHOU FIRST ELEMENT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following defects in this preparation method: 1) Fe 3 o 4 / CNTs composite material and lithium carbonate cannot achieve nanoscale dispersion, that is, the distance between Fe-Li is too large, and more energy and time (that is, higher synthesis temperature and synthesis time) are required to generate Li 5 FeO 4 ; 2) Fe 3 o 4 During ball milling, it will be stripped from the surface of CNTs, and the CNTs will agglomerate themselves, affecting the dispersion performance, thereby increasing the resistance of the material; 3) CO decomposed from lithium carbonate 2 will consume Li again 5 FeO 4 , leading to the reappearance of lithium carbonate, affecting the Li 5 FeO 4 4) During the high-temperature reaction process, the crystal grain grows up, and the particle size of the final product is 200-400nm. The particle size is large, and a large number of CNTs are oxidized by iron oxide, and the electrical conductivity is reduced, which affects Li 5 FeO 4 The electrochemical activity of the material is exerted

Method used

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  • Preparation method of electrochemically active material
  • Preparation method of electrochemically active material
  • Preparation method of electrochemically active material

Examples

Experimental program
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Embodiment 1

[0033] This embodiment prepares nano-Li 5 FeO 4 / CNT electrochemically active material process is as follows:

[0034] S 1 120g LiOH, 186g ferrocene, 1800g benzyl alcohol, 400mL methanol and 60mL thiophene were mixed uniformly in a closed glass reactor, and transported to a vertical cyclone furnace with a temperature of 1050°C at a rate of 20mL / s. The reaction is carried out under protection to obtain a Li-Fe-O / CNT nanoscale precursor;

[0035] S 2 , put the Li-Fe-O / CNT nanoscale precursor into a rotary furnace, introduce a pure oxygen atmosphere, raise it to 500 ° C, keep it for 2 hours, and then cool it down to room temperature to obtain high-purity Li 5 FeO 4 / CNT electrochemically active materials.

[0036] Li obtained in this example 5 FeO 4 / TEM images of CNTs electrochemically active materials as figure 1 As shown, the crystal grains are 20-50 nanometers; the material volume resistance is 275mΩ cm and the lithium ion capacity is 703mAh / gLi. 5 FeO 4 ;

[003...

Embodiment 2

[0039] This embodiment prepares nano-Li 5 FeO 4 / CNT electrochemically active material process is as follows:

[0040] S 1 , mix 330g of lithium acetate, 186g of ferrocene, 1.7L of benzyl alcohol, 300mL of methanol and 60mL of thiophene in a closed glass reactor, and transport them to a vertical cyclone furnace with a temperature of 850°C at a rate of 25mL / s. , react under the protection of nitrogen to obtain the nanoscale Li-Fe-O / CNT precursor;

[0041] S 2 , the nanoscale Li-Fe-O / CNT precursor was added to the rotary furnace, and the CO2-free 2 in dry air, heated to 500°C, kept for 2 hours, and then cooled to room temperature to obtain Li 5 FeO 4 / CNT electrochemically active materials.

[0042] The nanometer Li that present embodiment makes 5 FeO 4 / CNT electrochemically active material, its TEM picture is as Figure 4 shown.

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Abstract

The invention discloses a preparation method of an electrochemical active material, which belongs to the technical field of lithium battery materials. The preparation method of the electrochemically active material includes the following steps: first, the lithium salt, the iron salt and the carbon source are uniformly mixed and transported to the reactor, atomized and dispersed, and then synthesized in situ at a high temperature under the protection of an inert gas. / CNT precursor, and finally place the precursor in a pure oxygen atmosphere or without CO 2 heated in a dry air atmosphere to obtain nano-Li 5 FeO 4 / CNT electrochemically active materials. In the present invention, nano-Li 5 FeO 4 Evenly coated on the surface of CNT, effectively solve the problem of Li 5 FeO 4 The conductive problem of the material, and can realize the Li 5 FeO 4 / Continuous production of CNT electrochemically active materials.

Description

technical field [0001] The invention relates to a technology in the field of lithium battery materials, in particular to a preparation method of an electrochemically active material. Background technique [0002] In recent years, with the rapid development of electronic information products, the requirements for batteries are also increasing, especially in terms of battery capacity, charge and discharge performance, etc. The use of new positive and negative electrode materials is the key to improving battery capacity and charge-discharge performance. Lithium ferrate Li 5 FeO 4 As a lithium supplement additive for lithium batteries, it has received more and more attention worldwide. [0003] At present, the common lithium ferrite has low purity, large particle size difference, and its own non-conductivity, which seriously affects its electrochemical activity. In order to improve the purity and conductivity of lithium ferrite, Suk-Woo Lee et al. ("A study of the effects of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62B82Y30/00H01M10/052
CPCH01M4/366H01M4/525H01M4/625B82Y30/00H01M10/052Y02E60/10
Inventor 赵海静刘媛王金娥董明
Owner SUZHOU FIRST ELEMENT NANO TECH
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