Preparation method of nano-grade-carbon-clad spinel lithium titanate battery cathode material

A lithium titanate and battery negative electrode technology is applied in the field of preparation of nano-carbon-coated spinel lithium titanate battery negative electrode materials, which can solve the problems that hinder the full contact between the titanium source and the lithium source, the heterophasic multi-materials, and the different particle sizes. Uniformity and other issues, to achieve the effect of improving market application prospects, uniform particle morphology, and high specific capacity

Inactive Publication Date: 2012-06-13
TIANJIN LISHEN BATTERY
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  • Description
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Problems solved by technology

Due to the interference of the carbon source in the roasting process of the material synthesized by this method, although the growth of lithium titanate particles is inhibited to a cert

Method used

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  • Preparation method of nano-grade-carbon-clad spinel lithium titanate battery cathode material
  • Preparation method of nano-grade-carbon-clad spinel lithium titanate battery cathode material
  • Preparation method of nano-grade-carbon-clad spinel lithium titanate battery cathode material

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preparation example Construction

[0046] The invention provides a method for preparing a negative electrode material of a nano-carbon-coated spinel lithium titanate battery, comprising the following steps:

[0047] The first step: first put titanium dioxide and lithium source into the dispersant, then mix them evenly by stirring, and then dry;

[0048] Step 2: pre-calcine the dried mixture at a temperature of 400-800°C for 2-36 hours in the first atmosphere, and then naturally cool to room temperature (the room temperature is, for example, 15-25°C) to obtain an intermediate product ;

[0049] The third step: Put the obtained intermediate product and carbon source into the dispersant, then mix them evenly by stirring, and then dry;

[0050] Step 4: The mixture of the dried intermediate product, carbon source and dispersant is baked for 2-36 hours at a temperature of 700-950°C in a second atmosphere, and then naturally cooled to room temperature (the room temperature For example, 15~25℃), and finally obtain na...

Embodiment 1

[0074] Embodiment 1: First weigh particle size D 50 300nm, specific surface area BET 100m 2 1000g of titanium dioxide per gram, then placed in a ball mill jar together with 380g of lithium carbonate and 2000g of ethanol, and ball milled on a planetary ball mill at a speed of 400rpm (rev / min) for 8 hours, then taken out and dried. Place the dried mixture in a crucible, put it into a muffle furnace, raise the temperature to 750°C for pre-baking, keep it warm for 6 hours, and then naturally cool to room temperature to obtain intermediate product A.

[0075] Weigh 1000g of intermediate product A, 165g of glucose and 1750g of ethanol, place them in a ball mill jar, mill them on a planetary ball mill at a speed of 400rpm for 4 hours, then take them out and dry them. Put the dried mixture in a crucible, put it into an atmosphere furnace, heat up to 800°C under the protection of nitrogen for secondary baking, keep it warm for 6 hours, and cool it down to room temperature natura...

Embodiment 2

[0076] Embodiment 2: First weigh particle size D 50 50nm, specific surface area BET 200m 2 / g of titanium dioxide 1000g, then placed in a ball mill jar with 380g lithium carbonate and 2000g ethanol, ball milled with a speed of 400rpm on a planetary ball mill for 8 hours, then took it out and dried it. Place the dried mixture in a crucible, then put the crucible into a muffle furnace, raise the temperature to 700° C., keep it warm for 4 hours, and then naturally cool down to room temperature to obtain intermediate product B.

[0077] Weigh 1000g of intermediate product B, 165g of glucose and 1750g of ethanol, place them in a ball mill jar, mill them on a planetary ball mill at a speed of 400rpm for 4 hours, then take them out and dry them. Place the dried mixture in a crucible, then put it into an atmosphere furnace, raise the temperature to 750°C under the protection of nitrogen, keep it warm for 10 hours, and cool it naturally to room temperature to finally get nano-carbo...

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Abstract

The invention discloses a preparation method of a nano-grade-carbon-clad spinel lithium titanate battery cathode material. The method comprises steps that: titanium dioxide and a lithium source are placed in a dispersant; the mixture is uniformly mixed, and is dried by baking; the dried mixture is pre-roasted for 2-36h under a temperature of 400-800 DEG C in a first atmosphere; the mixture is naturally cooled to room temperature, such that an intermediate product is obtained; the obtained intermediate product and a carbon source are placed in a dispersant; the mixture is uniformly mixed, and is dried by baking; the dried mixture of the dried intermediate product, the carbon source and the dispersant is subject to secondary roasting for 2-36h under a temperature of 700-950 DEG C in second first atmosphere; the mixture is naturally cooled to room temperature, such that nano-grade-carbon-clad spinel lithium titanate is obtained. According to the invention, with the preparation method of the nano-grade-carbon-clad spinel lithium titanate battery cathode material, a lithium titanate cathode material with a nano-grade size, uniform particle morphology, and high purity is obtained. Also, the conductivity of the lithium titanate cathode material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a negative electrode material of a nano-carbon-coated spinel lithium titanate battery. Background technique [0002] In recent years, the output of automobiles in various countries in the world has increased rapidly with the development of the economy. However, the deepening of the global energy crisis, the depletion of oil resources and the aggravation of environmental pollution have made the automobile industry face a serious problem: energy saving and emission reduction. Electric vehicles have become the focus of attention due to their low energy consumption and no pollution. [0003] Lithium-ion batteries are most likely to replace traditional lead-acid batteries and nickel-metal hydride batteries for electric vehicles due to their high operating voltage, high energy density, low self-discharge and no pollution to the environment. However, t...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 杜萍熊永莲张德仁徐圣钊荆雷高俊奎
Owner TIANJIN LISHEN BATTERY
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