A kind of nano lithium titanate composite material and its preparation method, lithium titanate battery

A nano-lithium titanate and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unclean removal of silicon dioxide, reduced material purity, and reduced cycle performance, and is conducive to absorption and storage. , The effect of improving the rate performance and reducing the expansion rate

Active Publication Date: 2019-02-12
深圳博磊达新能源科技有限公司
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  • Application Information

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Problems solved by technology

[0004] Patent Publication No. CN104617270A discloses a preparation method of a spherical hollow lithium titanate / graphene composite material as a lithium titanate negative electrode material. The method uses a template method to prepare a core-shell structure of silica@titania, and then uses lithium hydroxide as a The lithium source converts titanium dioxide into lithium titanate through hydrothermal reaction, and at the same time removes the internal silicon dioxide by corrosion with the help of lithium hydroxide to generate lithium titanate with a hollow structure, but its template uses inorganic silicon dioxide, and there is silicon dioxide to remove it. The disadvantage of uncleanness reduces the purity of the material, and then the gram capacity is low and the cycle performance is reduced

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  • A kind of nano lithium titanate composite material and its preparation method, lithium titanate battery
  • A kind of nano lithium titanate composite material and its preparation method, lithium titanate battery
  • A kind of nano lithium titanate composite material and its preparation method, lithium titanate battery

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Embodiment 1

[0028] The nano-lithium titanate composite material of this embodiment has a hollow sphere structure, the inner core is hollow, and the outer shell is lithium titanate and polypropylene microspheres containing aluminum oxide coated on the outer surface of lithium titanate.

[0029] The preparation method of the nano-lithium titanate composite material comprises the following steps:

[0030] 1) Preparation of sulfonated polystyrene microspheres: in a nitrogen atmosphere, first add 20 g of styrene monomer to 200 g of secondary distilled water, heat up to 80 ° C, and after stirring for 30 min, add dropwise 30 g of dissolved 0.8 g of supernatant. The aqueous solution of potassium sulfate was reacted at a temperature of 80 °C for 24 hours, and then the reactant was cooled to room temperature, that is, a polystyrene microsphere emulsion. Take 20g of the emulsion prepared above, centrifuge at 5000r / min for 60min, then wash with water, disperse the obtained solid product into 60g of c...

Embodiment 2

[0035] The nano-lithium titanate composite material of this embodiment has a hollow spherical structure, the inner core is hollow, and the outer shell is lithium titanate and polystyrene microspheres containing aluminum oxide coated on the outer surface of lithium titanate.

[0036] The preparation method of the nano-lithium titanate composite material comprises the following steps:

[0037] 1) Preparation of sulfonated polystyrene microspheres: under nitrogen atmosphere, first add 10g of styrene monomer to 200g of secondary distilled water, heat up to 80°C, stir for 30min, add dropwise 30g dissolved in 0.5g The aqueous solution of potassium sulfate was reacted at a temperature of 80 °C for 24 hours, and then the reactant was cooled to room temperature, that is, a polystyrene microsphere emulsion. Take 20g of the emulsion prepared above, centrifuge at 8000r / min for 45min, then wash with water, disperse the obtained solid product into 60g of concentrated sulfuric acid, react at...

Embodiment 3

[0042] The nano-lithium titanate composite material of this embodiment has a hollow spherical structure, the inner core is hollow, and the outer shell is lithium titanate and polyvinyl chloride microspheres containing aluminum oxide coated on the outer surface of lithium titanate.

[0043] The preparation method of the nano-lithium titanate composite material comprises the following steps:

[0044] 1) Preparation of sulfonated polystyrene microspheres: under nitrogen atmosphere, first add 30g of styrene monomer to 200g of secondary distilled water, heat up to 80°C, stir for 30min, add dropwise 30g dissolved in 1.0g The aqueous solution of potassium sulfate was reacted at a temperature of 80 °C for 24 hours, and then the reactant was cooled to room temperature, that is, a polystyrene microsphere emulsion. Take 20g of the emulsion prepared above, centrifuge at 10000r / min for 10min, then wash with water, disperse the obtained solid product into 60g concentrated sulfuric acid, rea...

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Abstract

The invention provides a nano lithium titanate composite, a preparation method thereof and a lithium titanate battery. The nano lithium titanate composite adopts a hollow sphere structure, the core is hollow, and the shell is lithium titanate and organic high-polymer carbon microspheres which cover the outer surface of lithium titanate and contain aluminum oxide. Sulfonated polystyrene microspheres are used as a template, a secondary template is formed after addition of titanium dioxide, then a lithium compound is added, a sulfonated polystyrene / lithium titanate composite is obtained after even mixing and drying, a solvent is added to dissolve the sulfonated polystyrene microspheres, the material is added to a high-polymer carbon microsphere mixed solution to be dispersed and soaked, and the nano lithium titanate composite is obtained after filtration. The hollow structure of the obtained material and the organic high-polymer carbon microspheres which are arranged on the outer layer and contain aluminum oxide have a synergistic effect, the liquid absorption and retention capacity, the expansion rate, gram volume and the like of the material can be effectively improved, and the rate capability, cycle performance and safety of the lithium ion battery are finally realized.

Description

technical field [0001] The invention relates to a nanometer lithium titanate composite material and a preparation method thereof, a lithium titanate battery, and belongs to the field of preparation of negative electrode materials for lithium ion batteries. Background technique [0002] With the continuous expansion of the market application scope of supercapacitors with high power characteristics and long cycle characteristics, especially in the field of public transportation, higher energy density, safety, service life and rate performance of core electrode energy storage materials have been proposed. requirements. Among the current negative electrode materials for batteries, lithium titanate (Li 4 Ti 5 O 12 ) has become the best choice for hybrid capacitor anode materials because of its unique advantages such as long cycle life, strong charge-discharge performance at high currents, and almost no deformation of the crystal skeleton structure. [0003] However, as a meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王燕吴英鹏龙官奎原东甲赵晓锋
Owner 深圳博磊达新能源科技有限公司
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