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Polyaniline/polyethylene glycol-co-coated composite ternary positive electrode material and preparation and application thereof

A polyethylene glycol and cathode material technology, applied in the field of lithium ion batteries, can solve the problems of decreased ionic conductivity of materials, single coating of conductive polymers, uneven coating layers, etc., to improve stability and reduce residual alkali. The effect of simple content and preparation process

Active Publication Date: 2018-10-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies and defects mentioned in the above background technology, such as defects such as single coating of conductive polymer, great difficulty in coating, uneven coating layer, and decreased ion conductivity of materials after coating, the purpose of the present invention is to provide a Polyaniline / polyethylene glycol co-wrapped composite ternary cathode material with good coating effect and good chemical stability

Method used

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  • Polyaniline/polyethylene glycol-co-coated composite ternary positive electrode material and preparation and application thereof
  • Polyaniline/polyethylene glycol-co-coated composite ternary positive electrode material and preparation and application thereof
  • Polyaniline/polyethylene glycol-co-coated composite ternary positive electrode material and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Conductive polymer polyaniline (5612-44-2, doped with hydrochloric acid, Shandong Jiaying) and polyethylene glycol (1000M w , Shanghai Sinopharm) was dispersed in N-methylpyrrolidone solvent (1:10) at a mass ratio of 1:1, and stirred in a water bath at 50°C for 10 minutes to obtain a dispersion; slowly add LiNi to the dispersion 0.8 co 0.1 mn 0.1 o 2 Ternary materials, reacted for about 15 minutes, vacuum dried at 100°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.8 co 0.1 mn 0.1 o 2 Composite material, wherein the coating amount of the polymer is 5wt%.

[0041] figure 1 SEM images of ternary materials before and after modification. Depend on figure 1 It can be seen that the morphology of the material after modification basically does not change, and they are all spherical particles, indicating that the coating process will not damage the overall shape of the material; it can be seen from the figure that the pri...

Embodiment 2

[0046] Conductive polymer polyaniline (5612-44-2, doped with sulfuric acid, Shandong Jiaying) and polyethylene glycol (2000M w , Shanghai Sinopharm) was dispersed in a xylene solvent (1:15) at a mass ratio of 2:1, and stirred in a water bath at 60°C for 15 minutes to obtain a dispersion; slowly add LiNi to the dispersion 0.6 co 0.2 mn 0.2 o 2 Ternary materials, reacted for about 20 minutes, vacuum dried at 110°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.6 co 0.2 mn 0.2 o 2 Composite material, wherein the coating amount of polymer is 4wt%.

[0047] Figure 5 It is the cycle curve graph of positive electrode ternary material before and after modification under 1C current density, 25°C and 2.8-4.3V voltage range, which is determined by Figure 5 It can be seen that after the material before modification is cycled 100 times at 1C, the capacity of the material increases from 172.7mAh g -1 Rapidly decays to 145.4mAh·g -1...

Embodiment 3

[0049] Conductive polymer polyaniline (5612-44-2, doped with salicylic acid, Shandong Jiaying) and polyethylene glycol (3000M w , Shanghai Sinopharm) was dispersed in xylene solvent (1:20) at a mass ratio of 3:1, and stirred in a water bath at 70°C for 15 minutes to obtain a dispersion; slowly add LiNi to the dispersion 0.5 co 0.2 mn 0.3 o 2 Ternary materials, reacted for about 25 minutes, vacuum dried at 90°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.5 co 0.2 mn 0.3 o 2 Composite material, wherein the coating amount of polymer is 6wt%.

[0050] Figure 6 It is the cycle curve graph of positive electrode ternary material before and after modification under 1C current density, 25°C and 2.8-4.3V voltage range, which is determined by Figure 6It can be seen that after the material before modification was cycled 100 times at 1C, the capacity of the material increased from 159.7mAh g -1 Rapidly decays to 130.5mAh·g -1 ,...

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Abstract

The invention belongs to the technical field of positive electrode materials for lithium-ion batteries and particularly relates to a polyaniline / polyethylene glycol-co-coated composite ternary positive electrode material. The composite ternary positive electrode material comprises a ternary positive electrode material, polyaniline and polyethylene glycol, wherein the polyaniline and the polyethylene glycol coat the surface of the ternary positive electrode material. The invention further provides a preparation method and application of the composite ternary positive electrode material. According to the composite ternary positive electrode material, the electrical property of the obtained composite ternary positive electrode material is cooperatively improved through the surface action between the ternary positive electrode material and the polyaniline and the polyethylene glycol, and the coating effect and the chemical stability are improved. Furthermore, a wet coating method is innovatively adopted, so that the process is simple; the coating effect can be further improved through component cooperation; the performance of the material is improved; and the polyaniline / polyethylene glycol-co-coated composite ternary positive electrode material has the advantages of being simple in operation and high in consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a surface modification method for co-wrapping lithium-ion battery cathode ternary materials with double conductive polymers. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric vehicle tools, and even large-scale energy storage devices. The current commercial lithium battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials. Among them, ternary materials have high specific capacity, energy density and power density, high working voltage and stable performance, thus becoming a popular material for commercial cathode research. However, the cycle performance and rate performance of ternary materials are poor. At the same time, the high residual alkali content on the surface of ternary materials has brought many negative effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 胡国荣亓先跃杜柯彭忠东曹雁冰王勇胡凯华
Owner CENT SOUTH UNIV
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