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A kind of lithium titanate negative electrode material and lithium titanate battery

A negative electrode material, lithium titanate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor capacity performance, achieve high gram capacity, improve conductivity, and evenly distribute the effect

Active Publication Date: 2019-08-23
深圳博磊达新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium titanate negative electrode material, thereby solving the problem of poor gram capacity performance of existing lithium titanate battery materials

Method used

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  • A kind of lithium titanate negative electrode material and lithium titanate battery
  • A kind of lithium titanate negative electrode material and lithium titanate battery
  • A kind of lithium titanate negative electrode material and lithium titanate battery

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Embodiment 1

[0031] The lithium titanate negative electrode material of this embodiment is prepared by the following steps:

[0032] 1) 32g titanium dioxide, 18.5g lithium carbonate, 1.52g carbon nanotubes (addition is 3% of the total mass of lithium source and carbon source), 1.52g citric acid (addition is 3% of the total mass of lithium source and carbon source) ) and 0.51g polyvinyl alcohol (the addition amount is 1% of the total mass of lithium source and carbon source) are mixed and added to 100g N-methylpyrrolidone and mixed to obtain a precursor slurry;

[0033] 2) Spray granulate the precursor slurry, and then sinter at 600°C for 6 hours to obtain lithium titanate powder; during spray granulation, the air inlet temperature is 400°C, the feed rate is 50ml / min, and the air flow rate is 300L / h, and the outlet air temperature is 100°C;

[0034] 3) Soak lithium titanate powder in polyaniline solution for 2 hours, separate, and dry at 80°C to obtain lithium titanate / polyaniline composit...

Embodiment 2

[0038] The lithium titanate negative electrode material of this embodiment is prepared by the following steps:

[0039]1) With 28g titanium dioxide, 12g lithium hydroxide (the molar ratio of Ti, Li is 3.5:5), 0.4g carbon nanotube (addition is lithium source, 1% of the total mass of carbon source), 0.4g polyacrylamide ( The addition amount is 1% of the total mass of the lithium source and the carbon source) and 0.2g polyvinyl alcohol (the addition amount is 0.5% of the total mass of the lithium source and the carbon source) are mixed evenly and added to 50g of N-methylpyrrolidone and mixed to obtain a precursor Body slurry;

[0040] 2) Spray granulate the precursor slurry, and then sinter at 500°C for 12 hours to obtain lithium titanate powder; during spray granulation, the air inlet temperature is 300°C, the feed rate is 1ml / min, and the air flow rate is 100L / h, and the outlet air temperature is 100°C;

[0041] 3) Soak lithium titanate powder in polythiophene solution for 2 ...

Embodiment 3

[0045] The lithium titanate negative electrode material of this embodiment is prepared by the following steps:

[0046] 1) 36g of titanium dioxide, 33g of lithium metaaluminate (the molar ratio of Ti and Li is 4.5:5), 3.45g of carbon nanotubes (the amount added is 5% of the total mass of lithium source and carbon source), 3.45g of methyl fiber element (addition is lithium source, 5% of carbon source total mass) and 1.38g polyvinyl alcohol (addition is lithium source, 2% of carbon source total mass) is mixed and added in 200g N-methylpyrrolidone and mixed, Obtain precursor slurry;

[0047] 2) Spray granulate the precursor slurry, and then sinter at 800°C for 1 hour to obtain lithium titanate powder; during spray granulation, the air inlet temperature is 500°C, the feed rate is 100ml / min, and the air flow rate is 500L / h, and the outlet air temperature is 100°C;

[0048] 3) Soak lithium titanate powder in polypyrrole solution for 2 hours, separate, and dry at 80°C to obtain lit...

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Abstract

The invention discloses a lithium titanate negative electrode material and a lithium titanate battery. Preparation of the lithium titanate negative electrode material comprises the steps of (1) adding a lithium source, a titanium source, a carbon nanotube, an additive and a dispersing agent to a solvent for mixing to obtain precursor slurry; (2) carrying out spray granulation on the precursor slurry to obtain lithium titanate powder; (3) soaking the lithium titanate powder into a conductive polymer solution and carrying out separating and drying to obtain a lithium titanate / conductive polymer composite material; and (4) soaking the lithium titanate / conductive polymer composite material into a functional solution and carrying out separating and drying to obtain the lithium titanate negative electrode material. According to the lithium titanate negative electrode material, through reasonable arrangement of a lithium titanate core and a coating material, the conductivity and the transmission rate of lithium ions can be effectively improved, so that the negative electrode material has good gram volume, cycle performance and safety performance.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a lithium titanate negative electrode material and a lithium titanate battery. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly carbon-based materials. Although the cost of carbon anode materials is low, they have disadvantages such as poor safety performance, low initial charge and discharge efficiency, and thermal runaway at high temperatures. Lithium titanate (Li 4 Ti 5 o 12 ) has the advantages of "zero strain effect" in which the volume remains unchanged during the intercalation and extraction of lithium ions, and a chemical diffusion coefficient that is an order of magnitude larger than that of carbon anode materials. It is considered to be one of the most promising anode materials. However, the low electronic conductivity is currently restricting the Li 4 Ti 5 o 12 The main obstacle t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/36H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 王燕吴英鹏龙官奎原东甲李志赵晓锋
Owner 深圳博磊达新能源科技有限公司