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Preparation method of nano porous metal oxide/carbon lithium ion battery cathode material

A lithium-ion battery, nanoporous technology, applied in the field of electrochemistry, can solve the problems that limit the practical application of porous transition metal oxide/carbon composite materials, reduce the porosity of composite materials, and uncontrollable reaction process, etc., and achieve excellent high-rate discharge performance, inhibition of dissolution loss, and good cycle stability

Active Publication Date: 2014-09-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is not only complicated and energy-consuming, the reaction process is uncontrollable, the repeatability is poor, and the yield is very low, but also the carbon produced in the second step will partially fill the pores obtained in the first step, reducing the porosity of the composite material, thereby affecting its performance.
Therefore, the practical application of porous transition metal oxide / carbon composites is limited

Method used

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  • Preparation method of nano porous metal oxide/carbon lithium ion battery cathode material
  • Preparation method of nano porous metal oxide/carbon lithium ion battery cathode material
  • Preparation method of nano porous metal oxide/carbon lithium ion battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh ferrous ammonium sulfate and aminotriacetic acid at a molar ratio (1-3):1, put them into a high-pressure reactor, then add distilled water to vigorously stir and dissolve, and obtain a concentration of ferrous ammonium sulfate of 0.05mmol / mL~0.6 mmol / mL solution. Heating at 100-180°C for 10-72 hours, cooling naturally to obtain a blue-white one-dimensional nanoribbon iron-based complex Fe-NTA, which is centrifuged, washed, and vacuum-dried. Put the obtained iron-based complex Fe-NTA into a tube furnace with nitrogen or argon, and thermally decompose it at 300-600°C for 0.5-6h, with a heating rate of 2-10°C / min, to obtain a one-dimensional nanoribbon porous nano-Fe 3 o 4 / C composite anode material.

[0040] The resulting product was analyzed by X-ray diffraction as follows: figure 1 The diffraction pattern shown shows that the product is Fe 3 o 4 , without any impurity phase; the scanning electron microscope picture is as follows figure 2 Shown, showing Fe...

Embodiment 2

[0043] Ferrous ammonium sulfate is replaced by ferrous chloride in embodiment 1, other is the same as embodiment 1, obtains one-dimensional nanoribbon shape porous Fe 3 o 4 / C composite negative electrode material, under the current density of 100 mA / g, the charge and discharge test results in the first three weeks are as follows: Figure 6 shown. The charge and discharge capacities in the first three weeks were 1162 / 1789, 1180 / 1336, and 1140 / 1310 mAh / g, respectively.

Embodiment 3

[0045] Ferrous ammonium sulfate is replaced by ferrous sulfate in embodiment 1, and other is the same as embodiment 1, obtains one-dimensional nanoribbon-shaped porous Fe 3 o 4 / C composite negative electrode material, under the current density of 100 mA / g, the charge and discharge test results in the first three weeks are as follows: Figure 7 shown. The charge and discharge capacities in the first three weeks were 1239 / 1863, 1245 / 1371, and 1252 / 1357 mAh / g, respectively.

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Abstract

The invention provides a preparation method of a nano porous metal oxide / carbon lithium ion battery cathode material. The preparation method comprises the following steps: firstly, weighting ferric salt or manganese salt and carboxylate organic ligands, and putting into a high-pressure reaction kettle; and after a polar solvent is added and dissolved, carrying out a hydrothermal reaction for 10-72h at 100-180 DEG C to generate a transition metal coordination polymer precursor; and after the transition metal coordination polymer precursor is washed and dried, decomposing the precursor for 0.5-6h at a temperature of 300-600 DEG C in an inert atmosphere in a tube furnace, thus obtaining a nano porous metal oxide / carbon lithium ion battery cathode material containing iron oxides or manganese oxides. According to the preparation method, since the transition metal coordination polymer precursor which is structurally designable and controllable is used as a template-type precursor, a nano porous metal oxide / carbon lithium ion battery cathode material is obtained by using an in-situ thermal decomposition method. The method is simple in process, and the obtained products have the advantages of high electrical conductivity, high specific capacity, good cycle stability, excellent high-ratio discharge performance and high energy density.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a preparation method of a nanoporous metal oxide / carbon lithium ion battery negative electrode material. Background technique [0002] With the development of industry and the progress of society, energy and environmental issues have become the focus of international attention. The development of clean, pollution-free and renewable new energy is an important direction of scientific and technological research today. Among many new energy technologies, lithium-ion batteries have developed rapidly due to their advantages such as high working voltage, high specific energy, long cycle life, wide working temperature range, safety and no memory effect. In recent years, with the commercial development of electric vehicles, hybrid vehicles, etc., lithium-ion batteries are facing increasing challenges. The development of lithium-ion batteries with high specific capacity, high power, long c...

Claims

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Application Information

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IPC IPC(8): C01G49/08C01G45/02C01B31/02H01M4/50H01M4/52H01M4/62B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 栗欢欢王亚平陈龙江浩斌陈依李云星袁园
Owner JIANGSU UNIV
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