Method for preparing nitrogen-carbon co-coated lithium titanate anode material

A negative electrode material and a technology for coating lithium titanate, which is applied in the field of preparing carbon-nitrogen co-coated lithium titanate negative electrode materials, can solve problems such as poor electronic conductivity, and achieve high rate performance, good cycle performance, and uniform grain distribution. Effect

Inactive Publication Date: 2015-03-11
HUNAN UNIV OF ARTS & SCI
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Problems solved by technology

[0005] In order to improve Li 4 Ti 5 o 12 In order to solve the problems of poor electronic conductivity, the present invention proposes a method for preparing a carbon-nitrogen co-coated lithium titanate negative electrode material to improve its specific capacity under high-rate conditions

Method used

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  • Method for preparing nitrogen-carbon co-coated lithium titanate anode material
  • Method for preparing nitrogen-carbon co-coated lithium titanate anode material
  • Method for preparing nitrogen-carbon co-coated lithium titanate anode material

Examples

Experimental program
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Effect test

Embodiment 1L

[0023] Example 1Li 4 Ti 5 O 12 Preparation of negative electrode materials

[0024] Weigh 0.06mol of lithium carbonate and 0.075mol of titanium dioxide into a 250ml zirconia ball mill jar; add 35ml of acetone and zirconia beads with a diameter of 3mm; ball mill and mix for 6 hours at 500 rpm to obtain a slurry, then vacuum dry at 100°C A lithium titanate precursor was obtained; the lithium titanate precursor was heat-treated at 750° C. for 8 hours in an argon atmosphere. The target lithium titanate negative electrode material was obtained; wherein, the heat treatment was calcined at 750° C. for 8 hours. X-ray diffraction pattern see figure 1 , scanning electron microscope image see figure 2 .

Embodiment 2L

[0025] Example 2Li 4 Ti 5 O 12 / CN composite anode material preparation

[0026] Weigh 0.06mol of lithium carbonate and 0.075mol of titanium dioxide and 2g of melamine-formaldehyde resin into a 250ml zirconia ball mill jar; add 35ml of acetone and zirconia beads with a diameter of 3mm; ball mill and mix for 6 hours at 500 rpm to obtain the slurry The lithium titanate / carbon nitrogen composite precursor was obtained by vacuum drying at 100°C; the lithium titanate / carbon nitrogen composite precursor was heat-treated at 750°C for 8 hours in an argon atmosphere to obtain the target product carbon-nitrogen co-coated titanic acid Lithium negative electrode material; wherein, the heat treatment is calcined at 750° C. for 8 hours. X-ray diffraction pattern see figure 1 , scanning electron microscope image see figure 2 .

[0027] Depend on figure 1 It can be seen that the diffraction peaks of the samples obtained in Example 1 and Example 2 are consistent with those...

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Abstract

The invention discloses a method for preparing a nitrogen-carbon co-coated lithium titanate anode material. The method specifically comprises the following steps: 1) ball-milling lithium carbonate, titanium dioxide and melamino-formaldehyde in acetone for 6 hours, uniformly mixing, transferring into a vacuum drying box at the temperature of 100 DEG C, and drying to obtain a lithium titanate/nitrogen-carbon composite precursor; 2) roasting the lithium titanate/nitrogen-carbon composite precursor in argon at 750 DEG C for 8 hours to obtain the nitrogen-carbon co-coated lithium titanate anode material. The method is simple and safe in process and low in cost, and the prepared nitrogen-carbon co-coated lithium titanate anode material is fine and uniform in granule and relatively good in electrochemical property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a preparation method for preparing a carbon-nitrogen co-coated lithium titanate negative electrode material. Background technique [0002] With the increasing population, the gradual reduction of non-renewable energy sources (oil, coal, natural gas, etc.), and the increasing awareness of environmental protection, people are forced to develop new energy materials with high efficiency, environmental protection and energy saving. In addition, the national medium and long-term scientific and technological development plan (2006-2020) lists high-efficiency energy material technology as one of the frontier technologies for key development, especially emphasizing high-efficiency secondary battery materials and key technologies. Lithium-ion battery, as a new generation of high-performance green power supply, has the advantages of high specific energy, small self...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/1391H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 黄小兵陈远道周诗彪刘北平王云陈红辉
Owner HUNAN UNIV OF ARTS & SCI
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