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Lithium titanate cathode material and method for preparing same, and battery produced by employing same

A negative electrode material, lithium titanate technology, used in battery electrodes, circuits, electrical components, etc., can solve the problems of poor electronic conductivity and unsatisfactory electrochemical performance, and achieve good reproducibility, excellent rate performance, and cycle performance. excellent effect

Active Publication Date: 2013-08-14
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium titanate negative electrode material and a preparation method and a battery made of the negative electrode material, so as to solve the problems of poor electronic conductivity and unsatisfactory electrochemical performance of the lithium titanate material

Method used

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  • Lithium titanate cathode material and method for preparing same, and battery produced by employing same
  • Lithium titanate cathode material and method for preparing same, and battery produced by employing same
  • Lithium titanate cathode material and method for preparing same, and battery produced by employing same

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preparation example Construction

[0030] Another aspect of the present invention also provides a preparation method of lithium titanate negative electrode material, comprising the following steps:

[0031] Mixing: the first material is obtained after mixing the titanium source, the lithium source, the calcium source and the hafnium source.

[0032] Sintering: Sintering the first material to obtain the second material.

[0033] Pulverization: pulverize and disperse the second material to obtain lithium titanate negative electrode material.

[0034] Titanium source adopts anatase type (TiO 2 ), metatitanic acid (H 2 TiO 3 ), rutile (TiO 2 ), titanium isopropoxide Ti{OCH(CH 3 ) 2} 4 one or more of.

[0035] The lithium source is lithium carbonate (Li 2 CO 3 ), lithium hydroxide (LiOH), lithium hydroxide (LiOH·H 2 O), lithium acetate (CH 3 One or more of COOLi).

[0036] Calcium source mining calcium carbonate (CaCO 3 ), calcium hydroxide (Ca(OH) 2 ), calcium chloride (CaCl) in one or more.

[0037...

Embodiment 1

[0046] Embodiment 1: according to molecular formula Li 3.98 Ca 0.02 Ti 4.998 f 0.002 o 12 The stoichiometric ratio, weigh 39.91kg anatase TiO 2 , 14.70 kg of Li 2 CO 3 , 0.20kg CaCO 3 , 0.042 kg of HfO 2 , mixed in a 100L dry mixer; after mixing evenly, enter the fully automatic electric pusher kiln for sintering at 750°C, the sintering adopts a stepped temperature system, and the temperature settings for different temperature zones are (1 temperature zone 250°C, 2 Temperature zone 350°C, temperature zone 3 450°C, zone 4 550°C, zone 5 600°C, zone 6 to 10 are 750°C) pushing plate speed is 20min / push plate; after sintering is completed, use jet mill Pulverization, adjust the pulverization and classification parameters, so that the pulverization air pressure is 0.5 MPa, the feeding frequency is 40 Hz, and the classification wheel frequency is 90 Hz to obtain a lithium titanate negative electrode material with a particle size of D50 = 1.5 μm.

[0047] The negative electro...

Embodiment 2

[0051] Embodiment 2: according to molecular formula Li 3.95 Ca 0.05 Ti 4.999 f 0.001 o 12 The stoichiometric ratio, weigh 48.93kg of TiO(OH) 2 , 13.03 kg of CH 3 COOLi, 3.70kg of Ca(OH) 2 , 0.21kg of Hf (OC2H 5 ) 4 , add deionized water according to the solid-liquid volume ratio of 3:1, and add 0.62kg polyethylene glycol, and mix in a double planetary dynamic mixer; after mixing evenly, carry out vacuum drying to remove the solvent, the pressure is -0.08~-0.09 MPa; after being dried into powder, enter the fully automatic electric push plate kiln for sintering at 700°C, and the push plate speed is 25min / push plate. The sintering adopts a stepped temperature system, and the temperature settings of different temperature zones are (1 temperature zone 250°C, 2 temperature zone 300°C, 3 temperature zone 400°C, 4 temperature zone 500°C, 5 temperature zone 600°C, 6 to 10 temperature After the sintering is completed, the crushing step (revolution speed: 200 rpm: 600 rpm) is ca...

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Abstract

The invention provides a lithium titanate cathode material and a method for preparing the same, and a battery produced by employing the same. The chemical formula of the lithium titanate cathode material is as follows: Li4-xCaxTi5-yHfyO12, wherein x is greater than or equal to 0.01 and less than or equal to 0.05, and y is greater than or equal to 0.001 and less than or equal to 0.01. The lithium titanate cathode material is added with calcium element so that the electric conductivity of the battery is improved; besides, hafnium is added to inhibit grain growth; therefore, the rate capability of the lithium titanate cathode material is improved; and the problems of poor electric conductivity and unsatisfactory electrochemical properties of the lithium titanate cathode material are solved.

Description

technical field [0001] The invention relates to the fields of lithium ion batteries and supercapacitors, in particular to a lithium titanate negative electrode material and a preparation method. In addition, the present invention also relates to a battery made by using the above negative electrode material. Background technique [0002] With the depletion of fossil energy and the aggravation of environmental pollution, the source of automobile power has received unprecedented attention. Lithium-ion batteries are often used as power sources for mobile electronic devices, which can also serve as supercapacitors to power electric vehicles. However, the existing commercial lithium-ion batteries usually use lithium cobaltate or nickel-cobalt-manganese ternary materials as the positive electrode and carbon materials as the negative electrode. If this kind of positive and negative electrode pairing is applied to power batteries, it will cause great safety problems. . During the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 蔡亚楠王世银刘艳池田一崇
Owner HUNAN RESHINE NEW MATERIAL