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Preparation method of layered Li4Ti5O12@graphene composite lithium ion battery anode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low rate, charge and discharge capacity, and limitation, and achieve improved electrical conductivity, high specific surface area, and increased charging capacity. Effects of discharge capacity and cycle performance

Inactive Publication Date: 2014-10-15
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lithium-ion battery anode materials mainly include carbon-based materials, transition metal oxide materials, conductive polymer materials, and their composite materials, among which carbon-based materials are widely used in commercial applications, due to their safety and cycle stability , but limited by low rate and charge-discharge capacity

Method used

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  • Preparation method of layered Li4Ti5O12@graphene composite lithium ion battery anode material
  • Preparation method of layered Li4Ti5O12@graphene composite lithium ion battery anode material
  • Preparation method of layered Li4Ti5O12@graphene composite lithium ion battery anode material

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Embodiment 1

[0021] A layered Li 4 Ti 5 o 12 Preparation of graphene composite lithium-ion battery anode materials:

[0022] (1) Dandelion shape 4 Ti 5 o 12 Microsphere synthesis

[0023] Dandelion shape 4 Ti 5 o 12 The microspheres were synthesized by a new and improved hydrothermal method. The preparation steps are as follows: First, 0.672 g LiOH·H 2O was dissolved in 40 mL of deionized water, then 2 mL of 30% hydrogen peroxide was added, and 1.360 g of tetrabutyl titanate (TBT) was also added, and the process was kept under vigorous stirring; after 30 min, the prepared The mixed solution was transferred to a clean stainless steel autoclave lined with polytetrafluoroethylene, and kept at 150 °C for 6 h; after natural cooling to room temperature, the milky white precipitate was collected by centrifugation, and washed with deionized water and ethanol for several times, and then dried at 80°C for 5 h; finally, the obtained samples were annealed in air atmosphere at 500°C ...

Embodiment 2

[0030] A layered Li 4 Ti 5 o 12 Preparation of graphene composite lithium-ion battery anode materials:

[0031] (1) Dandelion shape 4 Ti 5 o 12 Microsphere synthesis

[0032] Dandelion shape 4 Ti 5 o 12 The microspheres were synthesized by a new and improved hydrothermal method. The preparation steps are as follows: First, 0.689 g LiOH·H 2 O was dissolved in 40 mL of deionized water, then 2.1 mL of 30% hydrogen peroxide was added, and 1.398 g of tetrabutyl titanate (TBT) was also added, and the process was kept under vigorous stirring; after 30 min, the prepared The mixed solution was transferred to a clean stainless steel autoclave lined with polytetrafluoroethylene, and kept at 150 °C for 6 h; after natural cooling to room temperature, the milky white precipitate was collected by centrifugation and washed with deionized water and ethanol several times, and then dried at 75°C for 6 h; finally, the obtained sample was annealed in air atmosphere at 500°C for ...

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Abstract

The invention relates to a preparation method of a layered Li4Ti5O12@graphene composite lithium ion battery anode material, which comprises the following steps: 0.640-0.690 g of lithium hydroxide monohydrate, 1,8-2.2 ml of hydrogen peroxide and 1.32-1.40 g of tetrabutyl titanate are added into deionized water and stirred to enable the solution to be transparent, the mixed solution is subjected to the hydro-thermal reaction, the temperature of the mixed solution is reduced to the room temperature through natural cooling, and centrifugal separation, washing and drying are carried out to obtain milk white Li4Ti5O12 powder; high temperature annealing is performed on the milk white Li4Ti5O12 powder in air for 3.8-4.2 hours at 500 DEG C to obtain pure white Li4Ti5O12 powder; 10-12 mg of the pure white Li4Ti5O12 powder is added into a 1g / L poly(allylamine hydrochloride) solution, subjected to ultrasonic dispersion and then dispersed into 30 ml of 0.2g / L GO solution, strong stirring is carried out at 0 DEG C, 20 ml of 80 wt% hydrazine hydrate solution is added, the mixed solution is heated to be 98 DEG C for 50-70 minutes, and the obtained sample is washed, filtered, and dried in vacuum to obtain the black Li4Ti5O12@graphene powder. According to the invention, the surfaces of dandelion-shaped Li4Ti5O12 microspheres are coated with a layer of ultrathin graphene to prepare the layered Li4Ti5O12@graphene composite lithium ion battery anode material, so that the charge-discharge capacity and the cycle life of the lithium ion battery anode material are improved.

Description

technical field [0001] The invention belongs to the field of preparation of electrochemical power sources, in particular to a layered Li 4 Ti 5 o 12 The technical problem to be solved by the preparation method of graphene composite lithium ion battery negative electrode material is to provide a lithium ion battery negative electrode material with simple preparation method, large rate charge and discharge and high cycle performance. Background technique [0002] With the development of power batteries, lithium-ion power batteries have the advantages of fast charging and discharging speed, long cycle life, good load performance and high working voltage, and have gradually become mainstream products, and have been widely used in various portable electronic device power supplies and power supplies. As an important factor to improve battery energy and cycle life, anode materials for lithium-ion batteries have been extensively studied. Lithium-ion battery anode materials mainly...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/122H01M4/485H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 孔德志程传伟
Owner TONGJI UNIV
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