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Preparation method of carbon-modified nano Li4Ti5O12-porous graphene composite electrode material

A technology of porous graphene and composite electrodes, which is applied in battery electrodes, nanotechnology, circuits, etc., can solve the problems of poor electronic conductivity of lithium titanate and limit high-rate performance, and achieve low cost, high efficiency, and simple process Effect

Active Publication Date: 2015-07-15
常州晶泰新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium titanate has poor electronic conductivity, which limits its high-rate capability

Method used

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  • Preparation method of carbon-modified nano Li4Ti5O12-porous graphene composite electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Carbon-modified nano-Li 4 Ti 5 o 12 Preparation: Weigh 1.3gLi 4 Ti 5 o 12 Nanomaterials are placed in the reaction zone of the reaction furnace, heated under a nitrogen atmosphere, the first heating is started at a heating rate of 5°C / min, the heating is stopped when the temperature rises to 400°C, and hydrogen gas is introduced at a flow rate of 400ml / min. After the completion of the hydrogen gas, start the second heating at a heating rate of 20°C / min, and at the same time, feed the mixed gas of hydrogen and carbon monoxide at a volume ratio of 3:10, raise the temperature to 1000°C and keep it for 1 hour. The above processes are all carried out under a nitrogen atmosphere. , and then stop heating and cool with nitrogen at a flow rate of 50ml / min to obtain carbon-modified nano-Li 4 Ti 5 o 12 . Microscopic characterization shows that the prepared carbon-modified nano-Li 4 Ti 5 o 12 , in spherical Li 4 Ti 5 o 12 The thickness of the carbon layer on the s...

Embodiment 2

[0035] (1) Carbon-modified nano-Li 4 Ti 5 o 12 Preparation: weigh 2.5gLi 4 Ti 5 o 12 The nanomaterials are placed in the reaction zone of the reaction furnace, heated under a helium atmosphere, the first heating is started at a heating rate of 20°C / min, the heating is stopped when the temperature is raised to 500°C, and hydrogen gas is introduced at a flow rate of 300ml / min. After the hydrogen flow is completed, start the second heating at a heating rate of 5°C / min, and at the same time, pass in a mixture of hydrogen and hydrocarbons at a volume ratio of 1:2, and raise the temperature to 800°C for 3 hours. Carry out under gas atmosphere, then stop heating and pass into nitrogen gas cooling at the flow rate of 100ml / min, obtain carbon-modified nano-Li 4 Ti 5 o 12 . Microscopic characterization shows that the prepared carbon-modified nano-Li 4 Ti 5 o 12 , in spherical Li 4 Ti 5 o 12 The thickness of the carbon layer on the surface of the nanometer material is 100-2...

Embodiment 3

[0043] (1) Carbon-modified nano-Li 4 Ti 5 o 12 Preparation: weigh 2.0gLi 4 Ti 5 o 12 The nanomaterials are placed in the reaction zone of the reaction furnace and heated under an argon atmosphere. The first heating is started at a heating rate of 30°C / min, and the heating is stopped when the temperature is raised to 450°C, and hydrogen gas is introduced at a flow rate of 200ml / min. After the completion of the hydrogen flow, start the second heating at a heating rate of 30°C / min, and at the same time, pass in a mixture of hydrogen and carbon dioxide at a volume ratio of 1:10, and raise the temperature to 1200°C and keep it for 10 minutes. The above processes are all in an argon atmosphere. , and then stop heating and pass through nitrogen cooling at a flow rate of 200ml / min to obtain carbon-modified nano-Li 4 Ti 5 o 12 . Microscopic characterization shows that the prepared carbon-modified nano-Li 4 Ti 5 o 12 , in spherical Li 4 Ti 5 o 12 The thickness of the carbo...

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Abstract

The invention discloses a preparation method of carbon-modified nano Li4Ti5O12-porous graphene composite electrode material. A carbon film is coated on the surface of a Li4Ti5O12 nano material by adopting a carbon modification method; nanoscale holes are introduced to the graphene surface; the carbon film and the nanoscale holes are highly compactly compounded, so as to form a three-dimensional conductive network structure. The preparation method has the advantages that combined utilization of nanocrystallization and combination of an Li4Ti5O12 active material is adopted; and a three-dimensional porous high-performance electrode material is prepared by adopting combined effects of a carbon-coated nano Li4Ti5O12 active material and the porous graphene compound, so that the efficiency, the cycling stability and the safety of lithium ion battery cathode materials are greatly improved; meanwhile, the preparation method is simple in process, high in preparation efficiency, low in cost, and suitable for large-scale industrial production; the first specific discharge capacity of the obtained carbon-modified nano Li4Ti5O12 and porous graphene composite electrode materials under 1C multiplying power can be up to 172 mAh / g and 98% of specific capacity is still kept after circulation for 100 times; the first specific discharge capacity under 20C multiplying power can be up to 159 mAh / g and 91% of specific capacity is kept after circulation for 100 times.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material of a power lithium ion battery, in particular to a method for preparing a composite electrode material of lithium titanate and graphene. Background technique [0002] With the increasing reduction of oil, coal and other energy sources, human society is facing an increasingly serious energy crisis. In the process of using traditional energy, the pollution produced has brought huge damage to the environment. Therefore, the development of clean and renewable energy is one of the key technical fields that will affect the future world economy. With its unique advantages such as high energy and power density, high working voltage, long cycle life, no memory effect and no pollution, lithium-ion batteries have become the first choice for high-performance power batteries such as pure electric vehicles (EV) and hybrid electric vehicles (HEV). preferred. The traditional battery negati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/583B82Y40/00
CPCH01M4/485H01M4/625Y02E60/10
Inventor 暴宁钟何大方
Owner 常州晶泰新材料科技有限公司
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