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Lithium titanate negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low tap density and low volume specific energy density of lithium-ion batteries, and achieve the effect of high volume specific energy density

Inactive Publication Date: 2012-09-19
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is a lithium titanate negative electrode material and its preparation method, which solves the problems of low tap density of lithium titanate negative electrode materials and low volume specific energy density of lithium ion batteries in the prior art

Method used

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  • Lithium titanate negative electrode material and preparation method thereof
  • Lithium titanate negative electrode material and preparation method thereof
  • Lithium titanate negative electrode material and preparation method thereof

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preparation example Construction

[0019] The invention provides a preparation method of lithium titanate negative electrode material, which specifically comprises the following steps: making LiOH·H 2 O and TiO 2 Add in a molar ratio of 0.7~0.9:1, mix well to obtain the first material; add deionized water to the first material at a solid-to-liquid volume ratio of 3:1, and pulverize into a suspended second material; dry the second material to obtain Precursor; sintering the precursor at 600-900° C. for 5-20 hours to obtain a third material; sieving the third material with 400 meshes to obtain a lithium titanate negative electrode material, the lithium titanate negative electrode material being spherical.

[0020] In the step of drying the second material to obtain the precursor, the second material is spray-dried to obtain a spherical precursor.

[0021] Since the spherical precursor has a higher density than other loose particles, the obtained lithium titanate negative electrode material has a higher tap densi...

Embodiment 1

[0036] LiOH·H 2 O and TiO 2Weigh at a molar ratio of 0.812:1; add the above-mentioned weighed raw materials and appropriate amount of deionized water into a wet pulverizer to pulverize into powder; then carry out spray drying, adjust the feed pump frequency to 34Hz, feed speed The drying temperature was set at 7.5kg / hr, and the drying temperature was set at 170°C to obtain the precursor; the precursor was sintered at a high temperature, the high temperature sintering temperature was controlled at 700°C, and the sintering time was controlled at 20 hours; after sintering and cooling, 400-mesh sieve was carried out. Finally, lithium titanate negative electrode materials with particle sizes of D50=8 μm, D10=4 μm, and D90=20 μm were obtained.

[0037] Test results of charge and discharge experiments: figure 2 As shown, the lithium titanate negative electrode material in Example 1 is made into a battery and then charged and discharged. The results show that the discharge capacity...

Embodiment 2

[0041] LiOH·H 2 O and TiO 2 Weigh according to the molar ratio of 0.7:1; add the above-mentioned weighed raw materials and appropriate amount of deionized water into a wet pulverizer to pulverize into powder; then carry out spray drying, adjust the feed pump frequency to 30Hz, feed speed The drying temperature is 7kg / hr, and the drying temperature is set at 150°C to obtain a lithium titanate precursor; the lithium titanate precursor is sintered at a high temperature, the high temperature sintering temperature is controlled at 600°C, and the sintering time is controlled at 20 hours; after sintering and cooling, the product is then A 400-mesh sieve was carried out to finally obtain lithium titanate negative electrode materials with particle sizes of D50=6 μm, D10=1 μm, and D90=10 μm.

[0042] Test results of charge and discharge experiments: The lithium titanate negative electrode material in Example 2 was made into a battery and then charged and discharged. The results showed ...

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Abstract

The invention provides a lithium titanate negative electrode material and a preparation method thereof. The lithium titanate negative electrode material is prepared from LiOH.H2O and TiO2 based on mole ratio of (0.7-0.9):1. The preparation method comprises the following steps of: uniformly mixing the LiOH.H2O and TiO2 to obtain a first material; adding the first material to a defined amount of deionized water and crushing to obtain a second suspension material; drying the second material to obtain a precursor; sintering the precursor at high temperature being 600-900 DEG C for 5-20h to obtain a third material; and sieving the third material in 400 meshes to obtain the lithium titanate negative electrode material in a shape of a sphere. The lithium titanate negative electrode material prepared by the method disclosed by the invention has the advantages of wide grain size distribution range, no impurities and high volumetric specific energy density, and solves a problem that the tap density of a negative electrode material of a lithium battery is hard to increase; and the tap density of the lithium titanate negative electrode material is as high as 1.4g / cm<3>.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a lithium titanate negative electrode material. Background technique [0002] At present, most of the anode materials for industrial production of lithium batteries use carbon anode materials, but carbon anode materials have the following disadvantages: when the battery is overcharged, lithium dendrites are easily formed on the surface of the carbon anode material, causing short circuit or explosion of the battery; low initial charge and discharge efficiency; The material is easy to react with the electrolyte, and the cycle performance is reduced; there are problems such as voltage hysteresis. Lithium titanate Li 4 Ti 5 o 12 As an anode material for lithium-ion batteries, it has the characteristics of good safety performance and long cycle life. These advantages have obvious advantages as an anode material for energy-storage lithium-ion batteries. Howev...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 王世银蔡亚楠刘艳池田一崇
Owner HUNAN RESHINE NEW MATERIAL
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