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Preparation method of graded Mn3O4 hollow microsphere material for high-performance lithium ion battery

A lithium-ion battery, graded technology, applied in the direction of nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problems of shortened cycle life, damage to the crystal structure of manganese tetraoxide, etc., to achieve high Effect of current charge and discharge characteristics and high cycle stability

Active Publication Date: 2016-06-01
QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Trimanganese tetraoxide is a typical transition metal oxide with a theoretical capacity of up to 936mAh / g. However, during charging and discharging, with the deintercalation of lithium ions, the volume of trimanganese tetraoxide will expand, which will destroy the The crystal structure of manganese tetraoxide, resulting in a shortened cycle life

Method used

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  • Preparation method of graded Mn3O4 hollow microsphere material for high-performance lithium ion battery
  • Preparation method of graded Mn3O4 hollow microsphere material for high-performance lithium ion battery
  • Preparation method of graded Mn3O4 hollow microsphere material for high-performance lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First add 0.24g of manganese acetate and 0.24g of cetyltrimethylammonium bromide (CTAB) into the reactor, then add 40mL of ethanol, and stir vigorously for 5-20 minutes to dissolve them evenly. Gained solution is added in the polytetrafluoroethylene lining, packs into reactor, puts into oven 200 DEG C and reacts 2 days. After natural cooling, centrifuge and wash the sample, then put it into an oven, and dry it at a temperature of 70°C in the air to obtain the graded Mn 3 o 4 Hollow microsphere material. Obtained by XRD experiment figure 1 Mn 3o 4 The XRD pattern of the graded hollow microsphere material is obtained by figure 1 It can be seen from the results that the synthesized trimanganese tetraoxide with high crystallinity has the same diffraction peak position as Mn 3 o 4 The standard map (JCPDSno.18-0803) matches. The corresponding indices of each crystal plane are as figure 1 shown. Obtained by scanning electron microscopy and transmission electron micro...

Embodiment 2

[0030] First add 2.4g of manganese nitrate and 0.9g of cetyltrimethylammonium bromide (CTAB) into the reactor, then add 25mL of ethanol, and stir vigorously for 15 minutes to dissolve them evenly. Gained solution is added in the polytetrafluoroethylene liner, packs into reactor, puts into baking oven 180 ℃ of reaction 2 days. After natural cooling, centrifuge and wash the sample, then put it into an oven, and dry it at a temperature of 70°C in the air to obtain the graded Mn 3 o 4 Hollow microsphere material. Lithium-ion battery assembly: grade Mn by mass fraction 3 o 4 Hollow microsphere material: polytetrafluoroethylene: acetylene black = 80:10:10 mixed and ground, evenly coated on the copper foil as the working electrode, the reference electrode and the counter electrode are metal lithium, and the electrolyte is made of 1MLiPF 6 EC+DMC+EMC (EC / DMC / EMC=1 / 1 / 1v / v / v) solution. All assembly takes place in the glove box.

Embodiment 3

[0032] First add 1g of manganese carbonate and 0.8g of cetyltrimethylammonium bromide (CTAB) into the reactor, then add 50mL of ethanol, and stir vigorously for 20 minutes to dissolve them evenly. Gained solution is added in the polytetrafluoroethylene liner, packs into reactor, puts into oven 180 ℃ and reacts 1 day. After natural cooling, centrifuge and wash the sample, then put it into an oven, and dry it at a temperature of 70°C in the air to obtain the graded Mn 3 o 4 Hollow microsphere material. Lithium-ion battery assembly: grade Mn by mass fraction 3 o 4 Hollow microsphere material: polytetrafluoroethylene: acetylene black = 75:10:15 mixed and ground and evenly coated on the copper foil as the working electrode, the counter electrode is lithium manganate, and the electrolyte is 1MLiPF 6 EC+DMC+EMC (EC / DMC / EMC=1 / 1 / 1v / v / v) solution. All assembly takes place in the glove box.

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Abstract

The invention discloses a preparation method of a graded Mn3O4 hollow microsphere material for a high-performance lithium ion battery. The preparation method comprises the following steps of adding 0.2-10g of manganese salt and 0.2-5g of cetyl trimethyl ammonium bromide (CTAB) into a reactor, and then adding 20-100mL of ethyl alcohol; violently stirring the mixture by a magnetic stirring device to make the mixture uniformly dissolved; adding the obtained solution into a polytetrafluoroethylene lining; loading the solution into a reaction kettle, placing the solution in a drying oven with 140-210 DEG C for 1-2 days; and naturally cooling the solution, centrifugally washing a sample, and then placing the sample in the drying oven, and drying the sample in air at a temperature of 70 DEG C, thereby obtaining the powder product, namely the graded Mn3O4 hollow microsphere material. The process is simple to operate, and is low in energy consumption and high in reproducibility, mass production can be achieved, and environmental requirement is met.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and more specifically relates to a high-performance graded Mn 3 o 4 Preparation method and application of hollow microspheres. Background technique [0002] The widespread use of traditional fossil energy has led to serious environmental problems. As a clean energy source, lithium-ion batteries have attracted extensive attention from researchers. With the development of technology, the market puts forward higher requirements on the performance of lithium-ion batteries. The performance of the battery is mainly determined by the performance of the electrode material. Therefore, lithium-ion battery electrode materials with high specific capacity, good stability and good rate performance are still the focus of attention. At present, the anode materials of lithium-ion batteries in industry mainly include graphite, mesocarbon microspheres and lithium titanate. However, their specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M10/0525B82Y30/00B82Y40/00C01G45/02
CPCB82Y30/00B82Y40/00C01G45/02H01M4/502H01M10/0525Y02E60/10
Inventor 曾令兴晨曦黄晓霞钱庆荣陈庆华黄宝铨肖荔人
Owner QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV