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A kind of amorphous manganese oxide/graphite composite nanomaterial and its preparation method and application in lithium ion battery

A composite nanomaterial, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor rate performance, poor conductivity of manganese oxide, material capacity decay, etc., to achieve good cycle performance, price Inexpensive, agglomeration-inhibiting effect

Active Publication Date: 2020-01-14
GUANGDONG ORIENT RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the delithiation / intercalation process, the volume of manganese oxides undergoes a huge change, resulting in a rapid decline in material capacity; in addition, the poor conductivity of manganese oxides makes the rate performance poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take by weighing 0.75g graphite successively, 14.25g potassium permanganate, 75g zirconium ball (grinding medium), add in the ball mill jar, then add 50ml water wherein, add seal ring, react 48h under 400rpm, the sample that obtains is passed through After the zirconium balls were filtered out through a sieve and sonicated for 2 hours, they were centrifuged and washed 4 times with distilled water, and dried at 60° C. for 12 hours to obtain an amorphous manganese oxide / graphite composite nanomaterial.

[0037] Weigh 0.2g of the amorphous manganese oxide / graphite composite nanomaterial prepared in this example, 0.025g of PVDF, and 0.025g of carbon black, mix and grind them and transfer them to a small glass bottle, add 1ml of NMP, and stir magnetically for 4 hours. The materials were coated on copper foil to make electrodes, and metal lithium was used as the counter electrode to assemble a CR2016 button cell in a glove box, and the electrochemical performance test was carr...

Embodiment 2

[0039] Weigh 1.5g of graphite, 13.5g of potassium permanganate, and 75g of zirconium balls (grinding media) in turn, add them to the ball mill jar, add 50ml of water to it, add a sealing ring, react at 400rpm for 48h, and sieve the obtained sample After the zirconium balls were filtered out through a net and ultrasonicated for 2 hours, they were centrifuged and washed 4 times with distilled water, and dried at 60° C. for 12 hours to obtain an amorphous manganese oxide / graphite composite nanomaterial.

[0040] Weigh 0.2g of the amorphous manganese oxide / graphite composite nanomaterial prepared in this example, 0.025g of PVDF, and 0.025g of carbon black, mix and grind them and transfer them to a small glass bottle, add 1ml of NMP, and stir magnetically for 4 hours. The materials were coated on copper foil to make electrodes, and metal lithium was used as the counter electrode to assemble a CR2016 button cell in a glove box, and the electrochemical performance test was carried out...

Embodiment 3

[0042] Weigh successively 4.5g of graphite, 10.5g of potassium permanganate, and 75g of zirconium balls (grinding medium), add them to the ball mill jar, then add 50ml of water, add a sealing ring, react at 400rpm for 48h, and sieve the obtained sample After the zirconium balls were filtered out through a net and ultrasonicated for 2 hours, they were centrifuged and washed 4 times with distilled water, and dried at 60° C. for 12 hours to obtain an amorphous manganese oxide / graphite composite nanomaterial.

[0043] The TEM images of the amorphous manganese oxide / graphite composite nanomaterials prepared in this embodiment under different magnifications are as follows figure 1 , figure 2 Shown, as seen from the figure, the present invention adopts simple ball milling method, utilizes the strong oxidation of mechanical force and potassium permanganate, successfully strips natural graphite into graphite (10~15 layers) of few layers.

[0044] Weigh 0.2g of the amorphous manganese...

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Abstract

The invention discloses an amorphous manganite / graphite composite nano material and a preparation method and application thereof to a lithium ion battery, and belongs to the technical field of lithium ion battery materials. The preparation method includes the steps that graphite and potassium permanganate are ball-milled in an aqueous solution, and then washing, ultrasonic treatment and drying are conducted to obtain the amorphous manganite / graphite composite nano material. The mass fraction of graphite in the obtained material is 5.2-58.6%, when the material is used for the negative pole of the lithium ion battery, the material has excellent electric performance, after circulation is conducted for 250 turns under the current density of 200 mA g<-1>, the material can still keep the reversible capacity of 977 mA h g <-1>, and under the condition of large current density (1000 mA g<-1>), after circulation is conducted for 200 turns, the reversible capacity can still be kept 300 mA h g<-1> or above.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to an amorphous manganese oxide / graphite composite nanomaterial, a preparation method thereof, and an application in lithium-ion batteries. Background technique [0002] At present, the society with the themes of energy, information and environment is eager to develop efficient, clean and recyclable new energy sources. As one of the green energy sources, rechargeable lithium-ion batteries have received great attention. Designing and synthesizing anode materials with high reversible capacity, excellent rate performance, long cycle life and low cost are one of the important development directions of lithium-ion batteries. Transition metal oxides with high theoretical capacity, including CoO, Co 3 o 4 , Fe 2 o 3 , SnO 2 , Mn 3 o 4 、MoO 2 etc., are promising new concept lithium battery anode materials. Among them, manganese oxide (MnO x ), in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/587
CPCH01M4/364H01M4/505H01M4/587Y02E60/10
Inventor 吴松平田小东黄明保杜瑶刘淳
Owner GUANGDONG ORIENT RESIN
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