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Preparation method of high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of lithium ion battery

A nitrogen-doped carbon, ion battery technology, applied in battery electrodes, titanates, titanium compounds, etc., can solve the problems of rapid specific capacity decay and poor conductivity of lithium titanate, and achieve excellent conductivity, low price, enhanced Effects of Conductivity and Electrochemical Reactivity

Inactive Publication Date: 2015-03-11
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of lithium titanate is poor, and the specific capacity decays rapidly in a high-rate environment. Doping coating is the most effective means to improve its performance.

Method used

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  • Preparation method of high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of lithium ion battery
  • Preparation method of high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of lithium ion battery
  • Preparation method of high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite lithium-ion battery negative electrode material, the steps are as follows:

[0028] Lithium hydroxide, nano-titanium dioxide and melamine are added to the ball mill (the speed of the ball mill is 2000 rpm), and anhydrous ethanol is used as the medium for ball milling for 1 hour (the speed of the ball mill is 2000 rpm), wherein lithium hydroxide and nano The mass ratio of titanium dioxide is 1:1, and the mass of melamine is 2.5% of the sum of the mass of lithium hydroxide and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The obtained powder mixture was calcined in a nitrogen atmosphere from room temperature to 700°C at a rate of 3°C / min, kept at this temperature for 3 hours, and cooled to obtain the primary product of nitrogen-doped carbon-coated lithium titanate composite material. The initial product was...

Embodiment 2

[0030] A preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite lithium-ion battery negative electrode material, the steps are as follows:

[0031] Lithium carbonate, nano-titanium dioxide and melamine are joined in the ball mill (the rotating speed of ball mill is 2000 revs / min), and with dehydrated alcohol as medium ball milling 1 hour (the rotating speed of ball mill is 2000 revs / min), wherein lithium carbonate and nano-titanium dioxide The ratio of the amount of substances is 0.5:1, and the mass of melamine is 7.5% of the sum of the mass of lithium carbonate and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The resulting powder mixture was calcined in an argon atmosphere from room temperature to 700°C at a rate of 3°C / min, and kept at a temperature of 3 hours. After cooling, the primary product of nitrogen-doped carbon-coated lithium titanate composite material was...

Embodiment 3

[0033] A preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite lithium-ion battery negative electrode material, the steps are as follows:

[0034] Lithium hydroxide, nano-titanium dioxide and melamine are added to the ball mill (the speed of the ball mill is 2000 rpm), and anhydrous ethanol is used as the medium for ball milling for 1 hour (the speed of the ball mill is 2000 rpm), wherein lithium hydroxide and nano The mass ratio of titanium dioxide is 1:1, and the mass of melamine is 5% of the sum of the mass of lithium hydroxide and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The obtained powder mixture was calcined in a nitrogen atmosphere from room temperature to 700°C at a rate of 3°C / min, kept at this temperature for 3 hours, and cooled to obtain the primary product of nitrogen-doped carbon-coated lithium titanate composite material. The initial product was m...

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Abstract

The invention relates to the technical field of preparation of electrode materials of lithium ion batteries and in particular discloses a preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of a lithium ion battery. The method comprises the following steps: firstly adding a lithium source, nano titanium dioxide and tripolycyanamide into a ball according to a certain material ratio, taking absolute ethyl alcohol as a medium, ball milling and then spray drying, subsequently calcining the materials under the inert atmosphere condition, ball milling and screening to obtain a nitrogen-doped carbon-compounded lithium titanate material which is applied to the anode material of the lithium ion battery and is high in electrochemical performance. The preparation method of the high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of the lithium ion battery is simple in process; the prepared anode material is high in reversible capacity and excellent in high-magnification cycle performance.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite lithium-ion battery negative electrode material. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) is a "zero-strain" material, and its crystal lattice does not undergo corresponding shrinkage and expansion during the lithium ion deintercalation and intercalation process, so the material structure is very stable and the cycle performance is also good. The charging and discharging platform of lithium titanate is about 1.55V, the theoretical specific capacity is 175mAh / g, the actual specific capacity can reach 165mAh / g, and the capacity contribution is concentrated in the platform area. In addition, compared with commercial carbon anode materials, lithium titanate has a larger diffusion coefficient at room temperature, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62C01G23/00
CPCC01G23/003H01M4/1391H01M4/1397H01M4/38H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 王锋丁瑜杜军罗良成覃彩芹
Owner HUBEI ENG UNIV
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