Graphene combined multilayered perforated spheroidic lithium manganese oxide electrode material and lithium ion battery prepared therefrom

A spherical lithium manganate and graphene composite technology, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problem that the nanomaterial activity accelerates the dissolution of the material, reduces the stability, and the cycle performance and rate of lithium manganate cannot be obtained. Significant improvement and other problems, to achieve the effect of enhancing cycle stability, enhancing electronic conductivity, improving ion diffusivity and cycle performance

Active Publication Date: 2017-11-07
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the activity of nanomaterials is too high, the dissolution of the material will be accelerated, and the stability will be reduced. The cycle performance and rate of element-doped lithium manganate have not been significantly improved.

Method used

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  • Graphene combined multilayered perforated spheroidic lithium manganese oxide electrode material and lithium ion battery prepared therefrom
  • Graphene combined multilayered perforated spheroidic lithium manganese oxide electrode material and lithium ion battery prepared therefrom
  • Graphene combined multilayered perforated spheroidic lithium manganese oxide electrode material and lithium ion battery prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]The synthesis steps of the graphene composite multilayer porous spherical lithium manganate used in the present invention are as follows: Weigh 0.25 g of cetyltrimethylammonium bromide (CTAB) and 11.85 g of ammonium bicarbonate and dissolve them in 250 mL of deionized Mixed solution 1 was formed in water, and 2.54 g of manganese sulfate was weighed and dissolved in 250 mL of deionized water to form mixed solution 2. Add the mixed solution 2 dropwise to the mixed solution 1 in an oil bath at 50°C for 30 minutes, adjust the pH to 7.5, keep the constant pH in the oil bath for 30 minutes, and leave the turbid solution for one day, then wash with water and centrifuge Dry in an oven at 60°C to obtain primary powder of manganese carbonate. The primary powder was calcined in a muffle furnace at 710°C to obtain the precursor manganese trioxide. Take 0.084 g of LiOH·H 2 O and 0.3 g of manganese trioxide were placed in a mortar, and 1 mL of absolute ethanol was used as a solvent....

Embodiment 2

[0044] The preparation of the graphene composite multilayer spherical lithium manganate material with holes is the same as that in Example 1.

[0045] The prepared graphene composite multilayer porous spherical lithium manganese oxide material is used as the positive electrode active material, and commercial graphite is used as the negative electrode active material. Mixing, using 1-methyl-2-pyrrolidone as a dispersant, mixing the above mixture evenly, adjusting it into a slurry, coating it on aluminum foil and copper foil respectively, drying and cutting at 60°C to obtain the corresponding positive and negative pole pieces ( The capacity of the negative electrode is much larger than the capacity of the cut positive electrode sheet), the electrode sheet and the lithium sheet are separated by Celgard 2500 polypropylene microporous membrane, and 1 M LiPF is used 6 Soluble in EC: DMC (mass ratio 1:1) as the electrolyte, stainless steel shell as the shell, assembled into a CR2016 ...

Embodiment 3

[0047] The graphene composite multilayer porous spherical lithium manganate material prepared in Example 1 was used as the positive electrode active material, and the positive electrode material was mixed with acetylene black and polyvinylidene fluoride in a mass ratio of 80:10:10, and 1-methyl - 2-Pyrrolidone is used as a dispersant. Mix the above mixture evenly to form a slurry and apply it on an aluminum foil. After drying at 60°C, cut it to obtain the positive electrode sheet. The lithium sheet is the negative electrode (the capacity of the negative electrode is much larger than the capacity of the positive electrode sheet). The positive pole piece and the lithium piece are separated by whatman glass fiber separator, using 1 MLiPF 6 Soluble in EC: DMC (mass ratio 1:1) as the electrolyte, stainless steel shell as the shell, assembled into a CR2025 button battery, the lithium-ion battery assembled in the above process has a potential range of 3.0 V-4.5 V at room temperature ...

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Abstract

The invention discloses a graphene combined multilayered perforated spheroidic lithium manganese oxide electrode material capable for charging and discharging lithium ions and a high-voltage rechargeable lithium ion battery containing the material. The multilayered perforated spheroidic lithium manganese oxide is prepared from manganic oxide which is used as a precursor with a solid phase method, manganese oxide has multiaperture, layered and open-ended morphology, and graphene laminated structures of the combined material are uniformly dispersed around the prepared lithium manganese oxide particles. The high-voltage rechargeable lithium ion battery employs graphene combined multilayered perforated spheroidic lithium manganese oxide as an anode, lithium metal or embeddable delithiated active material as a cathode, and a soluble lithium salt organic solution as electrolyte. The graphene combined multilayered perforated spheroidic lithium manganese oxide is used as the lithium ion battery electrode material, and the material has the advantages of low cost, rich raw materials, high voltage, good multiplying power, and good cycling stability. The rechargeable lithium ion battery containing the material has high energy density and high power density, and wide market application prospect.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a graphene composite multilayer porous spherical lithium manganate electrode material capable of charging and discharging lithium ions and a high-voltage chargeable and discharging lithium ion battery containing the material. Background technique [0002] As a medium for energy transmission between new energy and electronic equipment, lithium-ion batteries have been widely used in mobile phones, computers, electric vehicles and other equipment due to their high specific energy and long cycle life. However, for the next generation of transportation, power grids and consumer electronics with higher requirements, the current lithium-ion batteries cannot meet the requirements. Therefore, it is urgent to develop lithium-ion batteries with high voltage, high power density and high energy density. need. [0003] In the lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 冯祥明陈卫华李子贺宋轲铭米立伟郑金云
Owner ZHENGZHOU UNIV
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