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A carbon-coated spinel lithium manganate nanocomposite material and its preparation method and application

A technology of spinel lithium manganese oxide and nanocomposite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of complex operating conditions and difficult to achieve stable performance of the carbon coating method , It is difficult to mass-produce and apply problems, to achieve the effect of promoting lithium ion transmission, shortening ion diffusion and transmission paths, and benefiting rapid deintercalation

Active Publication Date: 2020-03-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon coating method has complex operating conditions, takes a long time, has poor controllability, and has many influencing factors. It is difficult to achieve stable performance in different batches, and the economic benefits are not good. It is difficult to apply in batch production in recent years.
[0012] The existing carbon-coated spinel lithium manganese oxide generally needs to be carbon-coated at high temperature (~600 degrees Celsius) by pyrolyzing organic compounds, and lithium manganate is prone to lack of oxygen atoms at high temperatures, resulting in performance degradation
Coating carbon materials by chemical vapor deposition (CVD) also causes loss of oxygen atoms

Method used

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  • A carbon-coated spinel lithium manganate nanocomposite material and its preparation method and application
  • A carbon-coated spinel lithium manganate nanocomposite material and its preparation method and application
  • A carbon-coated spinel lithium manganate nanocomposite material and its preparation method and application

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preparation example Construction

[0052] The preparation method of carbon material coating nano-lithium manganese oxide of the present invention, comprises the following steps:

[0053] 1) Take commercial lithium manganate and carbon materials and place them in a ball mill jar;

[0054] 2) Take a certain proportion of ball milling beads and place them in the above ball milling tank;

[0055] 3) Seal the lid of the ball mill tank and install it on the ball mill for ball milling

[0056] The preparation method of described carbon material coated nano-lithium manganate, wherein, preferably, the mass ratio of lithium manganate to carbon material in step (1) is 2:1;

[0057] The preparation method of described carbon material coated nano-lithium manganese oxide, wherein, preferably, in step (1), the ball milling jar is an agate ball milling jar;

[0058] The preparation method of described carbon material coated nano-lithium manganate, wherein, preferably, the carbon material in step (1) is conductive carbon blac...

Embodiment 1

[0070] Embodiment 1, preparation conductive carbon black coated nano lithium manganese oxide composite material, concrete steps are as follows:

[0071] Step 1: take by weighing 808mg spinel lithium manganate (LiMn 2 o 4 ) and 404mg conductive carbon black (super P) are placed in the 50ml agate ball mill jar;

[0072] Step 2: Take 3 milling beads with a diameter of 15mm, 1 milling bead with a diameter of 8mm, 2 milling beads with a diameter of 6mm, and 10 milling beads with a diameter of 5mm, and place them in the ball milling tank;

[0073] Step 3: Seal the lid of the ball mill tank with the above ingredients and install it in a high-energy ball mill for ball milling at a speed of 450rmp / min for 6 hours. After the ball milling is completed, the conductive carbon black-coated nano-lithium manganate composite material powder is obtained.

Embodiment 2

[0074] Embodiment 2, prepare conductive carbon black and graphene-coated nano-lithium manganese oxide composite material, the specific steps are as follows:

[0075] Step 1: take by weighing 808mg spinel lithium manganate (LiMn 2 o 4 ), 202mg conductive carbon black (super P), 202mg graphene powder are placed in the 50ml agate ball mill jar;

[0076] Step 2: Take 3 milling beads with a diameter of 15mm, 1 milling bead with a diameter of 8mm, 2 milling beads with a diameter of 6mm, and 10 milling beads with a diameter of 5mm, and place them in the ball milling tank;

[0077] Step 3: Seal the lid of the ball mill tank with the above ingredients and install it in a high-energy ball mill for ball milling at a speed of 550rmp / min for 6 hours. After the ball milling is completed, the conductive carbon black and graphene-coated nano-lithium manganese oxide composite material powder is obtained.

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Abstract

The invention discloses a carbon-coated spinel lithium manganate nanocomposite material as well as a preparation method and an application thereof. By utilizing a high-energy ball-milling one-step method, micron-scale spinel lithium manganate is crushed into nano-scale spinel lithium manganate, and meanwhile, the surfaces of nanoparticles are uniformly coated with a carbon material. By utilizing the nanoparticles, ion diffusion and transmission paths of the material in charging-discharging processes are shortened; by virtue of carbon coating, the conductivity of an active material is increased, meanwhile, the direct contact between a lithium manganate anode and electrolyte can be avoided, so that the rate capability and cycle performance of a lithium ion battery and a mixed supercapacitor can be substantially enhanced; and a conductive network is formed by a coating layer, so that a conductive agent does not need to be additionally added in subsequent application. Compared with traditional preparation methods, the preparation method has the advantages that a preparation process of the composite material is greatly simplified, and the carbon-coated spinel lithium manganate nanocomposite material is prepared by virtue of the one-step method.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a lithium manganate carbon nanocomposite material and its preparation and application. Background technique [0002] In the 21st century, human beings are facing severe challenges of energy crisis and environmental issues. The development of new energy (solar energy, wind energy, biomass energy, tidal energy, nuclear energy, geothermal energy) and renewable energy is an important measure to solve environmental pollution and achieve sustainable development . As an important electronic device, energy storage devices play a very important role. Among them, lithium-ion batteries, supercapacitors, and hybrid supercapacitors combined by the two have become the most potential energy storage devices. [0003] Spinel lithium manganese oxide LiMn 2 o 4 Rich in natural resources, low in price, high in safety, easy to prepare and non-toxic, it has become the most promising cathode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/583H01M4/62B82Y30/00H01M10/0525H01G11/46H01G11/32
CPCB82Y30/00H01G11/32H01G11/46H01M4/366H01M4/505H01M4/583H01M4/625H01M10/0525Y02E60/10Y02E60/13
Inventor 慈立杰陈丽娜陈龙张乐
Owner SHANDONG UNIV