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Preparation method of lithium ion battery cathode material composited by in-situ synthesis Fe-Fe3O4

A lithium-ion battery, fe-fe3o4 technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as low conductivity, achieve high specific capacity, wide source of raw materials, and increased transmission effects

Inactive Publication Date: 2014-02-12
三亚哈尔滨工程大学南海创新发展基地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of lithium-ion battery electrodes is to mix the active material powder and the binder into a paste, and then coat it on the substrate (aluminum foil, copper foil). Leads to lower conductivity, and part of the active material cannot contact the electrolyte and becomes a "dead area"

Method used

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  • Preparation method of lithium ion battery cathode material composited by in-situ synthesis Fe-Fe3O4
  • Preparation method of lithium ion battery cathode material composited by in-situ synthesis Fe-Fe3O4

Examples

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Effect test

Embodiment 1

[0016] The CTiC nanowire array was used as the matrix in 0.25mol L -1 FeSO 4 +70mL L -1 Triethanolamine deposition solution, constant current -0.010A cm -2 , deposited for 10 min to obtain a metal Fe film. Containing 0.3mol L -1 h 2 C 2 o 4 ,5%H 2 Soak in the mixed solution of O for 3h, and the soaking temperature is 45°C. Then put the prepared sample into the muffle furnace, calcined in the air for 2h, and the calcining temperature is 400°C to obtain the final Fe-Fe 3 o 4 / CTiC electrode. Assembled into a button lithium-ion battery for rate performance test. The results show that the specific capacity is as high as 1080mAh g at 1C charge and discharge current -1 .

Embodiment 2

[0018] CTiO 2 Nanowire array as a matrix in 0.1mol L -1 FeSO 4 +35mL L -1 In the triethanolamine deposition solution, a constant voltage of -1V was deposited for 5 minutes to obtain a metal Fe film. Containing 0.3mol L -1 h 2 C 2 o 4 ,50%H 2 Soak in the mixed solution of O for 1.5h, and the soaking temperature is 25°C. Then put the prepared sample into the muffle furnace, calcined in the air for 3h, and the calcining temperature is 350°C to get the final Fe-Fe 3 o 4 / CTiO 2 electrode. Assembled into a button lithium-ion battery for rate performance test. The results show that the specific capacity can reach 780mAh g at 2C charge and discharge current -1 .

Embodiment 3

[0020] The CTiC nanowire array was used as the matrix in 0.5mol L -1 FeSO 4 +70mL L -1 In the triethanolamine deposition solution, a constant voltage of -0.2V was deposited for 15 minutes to obtain a metal Fe film. containing 0.5mol L -1 h 2 C 2 o 4 ,70%H 2 Soak in the mixed solution of O for 2h, and the soaking temperature is 35°C. Then put the prepared sample into the muffle furnace, calcined in the air for 2h, and the calcining temperature was 400°C to obtain the final Fe-Fe3 o 4 / CTiC electrode. Assembled into a button lithium-ion battery for rate performance test. The results show that the specific capacity is as high as 540mAh g at 5C charge and discharge current -1 .

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Abstract

The invention provides a preparation method of a lithium ion battery cathode material composited by in-situ synthesis Fe-Fe3O4. The preparation method comprises the following steps: by taking a nano array (nanowire array such as C@TiO2, C@TiC) in a three-dimensional open structure as a base body, and a Fe salt solution as a deposited mother liquid, utilizing electrodeposition technologies of constant current, constant potential, cyclic voltammetry, pulse square wave voltammetry and the like, depositing a metallic Fe film on the base body, then placing the base body in a growth solution to carry out in-situ growth, and finally calcining in air to form the lithium ion battery cathode material composited by the Fe-Fe3O4. The preparation method can be used for preparing the lithium ion battery cathode with the high specific capacity, the high rate performance and the good cycle performance. The electrode is in a three-dimensional structure, and thus an active substance can be fully contacted with electrolyte, and the transfer of electrons / ions is effectively enhanced.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery. Background technique [0002] With the rapid development of the global economy, the depletion of fossil fuels and the increasingly serious environmental problems, it is more and more urgent to develop clean energy that is efficient, clean and sustainable. Lithium ion batteries have attracted a lot of attention in recent years, mainly due to their high power density and long life cycle, which can compensate for the small capacity of traditional dielectric capacitors (with high power output) and batteries, fuel cells ( has the disadvantage of high energy storage) and low power density. Generally speaking, the anode material of lithium ion battery is a research hotspot in recent years, and it is also an important factor affecting the development of lithium ion battery. The basic conditions that lithium-ion battery negative electrode materials should ...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/38
CPCH01M4/38H01M4/52Y02E60/10
Inventor 曹殿学杨帆程魁肖雪王贵领
Owner 三亚哈尔滨工程大学南海创新发展基地
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