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A kind of preparation method of nanometerized carbon-coated lithium titanate negative electrode material

A technology for carbon-coated lithium titanate and negative electrode materials, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high production cost, agglomeration phenomenon, high price, etc., and achieve savings The effect of production cost, reduction of manufacturing cost, and improvement of material properties

Active Publication Date: 2016-05-11
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The most commonly used preparation methods for lithium titanate anode materials are solid-phase method and organic titanium source decomposition synthesis method. However, the lithium titanate material produced by the solid-phase method has a large particle size, obvious agglomeration phenomenon, fast capacity decay, and poor cycle performance. Good; the use of organic titanium sources as raw materials to prepare lithium titanate materials can refine the material size, but it is expensive and the production cost is high, which is not suitable for mass industrial production. At the same time, the intrinsic conductivity of lithium titanate is low, which is not conducive to positive electrodes. High rate discharge of materials

Method used

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  • A kind of preparation method of nanometerized carbon-coated lithium titanate negative electrode material
  • A kind of preparation method of nanometerized carbon-coated lithium titanate negative electrode material
  • A kind of preparation method of nanometerized carbon-coated lithium titanate negative electrode material

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Embodiment 1

[0021] A preparation method of a nano-sized and carbon-coated composite lithium titanate negative electrode material, comprising the following steps:

[0022] (1) Prepare 8mol / L strong alkali solution, measure 80ml and add it to a 100ml autoclave polytetrafluoroethylene lining, then weigh 2g of titanium dioxide and add it, and then put it in an oven at 160°C for 5 hours. After the reaction, the precipitate in the polyethylene lining of the autoclave was washed several times with hydrochloric acid, then washed with distilled water and filtered, and finally placed in a drying device at 100°C for 5 hours; (2) according to the Li:Ti molar ratio of 0.84 : 1 Weigh lithium carbonate and titanium dioxide powder material after pretreatment, place ball mill jar; Then weigh and then weigh the soluble carbon source (relative to Ti salt) of 0.2 times molar mass, add in the beaker and dissolve with a small amount of distilled water, and then Transfer all the materials into a ball mill jar a...

Embodiment 2

[0025] (1) Prepare a 6mol / L strong alkali solution, measure 80ml and add it to a 100ml autoclave polytetrafluoroethylene lining, then weigh 2g of titanium dioxide and add it, and then place it in an oven at 180°C for 3 hours. After the reaction, the precipitate in the polyethylene lining of the autoclave was washed several times with hydrochloric acid, then washed with distilled water and filtered, and finally placed in a drying device at 100°C for 5 hours; (2) according to the Li:Ti molar ratio of 0.84 : 1 Weigh lithium carbonate and titanium dioxide powder material after pretreatment, place ball mill jar; Then weigh and then weigh the soluble carbon source (relative to Ti salt) of 0.2 times molar mass, add in the beaker and dissolve with a small amount of distilled water, and then Transfer all the materials into a ball mill jar and put them into agate balls for milling for 1 hour; (3) Quickly dry the above-mentioned materials through spray drying equipment, then transfer all ...

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Abstract

A preparation method of a nanocarbon coated lithium titanate cathode material comprises the following steps of: (1) preparing a strongly alkaline solution, weighing titanium dioxide, adding into an autoclave for reaction for 3-5h at 160-180 DEG C, cleaning a precipitate in a polyethene lining of the autoclave with hydrochloric acid for several times, performing filtration washing with distilled water, then putting in vacuum drying equipment for drying, (2) weighing a lithium source and pretreated titanium dioxide powder material according to an Li:Ti mole ratio, putting in a ball milling tank, then weighing a soluble carbon source, adding a little distilled water, dissolving at room temperature or under a heating condition, transferring all into a mixing tank, (3) quickly drying slurry with a spray dryer, transferring all materials into a corundum crucible or a saggar, putting in a muffle furnace for sintering in shielding gas, and (4) grinding and sieving an obtained material, and obtaining the carbon coated lithium titanate cathode material.

Description

technical field [0001] The invention relates to a preparation method of lithium titanate, a negative electrode material of a lithium ion secondary battery, in particular to a preparation method of a nanometerized carbon-coated lithium titanate negative electrode material. Background technique [0002] Lithium-ion battery, also known as "lithium-ion battery", is an important new energy technology to deal with the depletion of energy and the deteriorating environment in the 21st century. Its development first began in the period of the world oil crisis in the 1960s and 1970s. After nearly 20 years of exploration, in 1990, Japan's Sony Energy Company and Italy's Moli Energy Company took the lead in developing carbon materials as negative electrodes, LiCoO 2 positive lithium-ion battery. Since then, lithium-ion batteries have developed rapidly. At the same time, lithium-ion batteries have high energy density, high average output voltage, small self-discharge, no memory effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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