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Titanium phosphate lithium material used for cathode of lithium ion battery and preparation method thereof

A lithium ion battery, lithium titanium phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor electrochemical performance of materials, low electrical conductivity of materials, serious polarization phenomenon, etc., and it is easy to achieve carbon content. Control, improve conductivity, good reversibility

Inactive Publication Date: 2010-08-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the low conductivity of the material, the polarization phenomenon is serious during the charging and discharging process, and the electrochemical performance of the material is poor
2. LiTi 2 (PO 4 ) 3 Material synthesis requires multiple heat treatments and grinding, such as E. et al. (E. T. A. Dindune, et. La-doped LiTi 2 (PO 4 ) 3 ceramics, Solid State Ionics, 2008, 179: 51-56) with Li 2 CO 3 、TiO 2 and NH 4 h 2 PO 4 Preparation of LiTi as raw material 2 (PO 4 ) 3 The material was prepared by four times of ball milling and three times of roasting, the preparation process is relatively complicated and the cost is quite high

Method used

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  • Titanium phosphate lithium material used for cathode of lithium ion battery and preparation method thereof
  • Titanium phosphate lithium material used for cathode of lithium ion battery and preparation method thereof
  • Titanium phosphate lithium material used for cathode of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] LiH 2 PO 4 、TiO 2 and NH 4 h 2 PO 4 Weigh the mixed material according to the stoichiometric ratio of Li:Ti:P=1:2:3, use absolute ethanol as the dispersant, mix it according to the mass ratio of ball to material 5:1, and ball mill it on a planetary ball mill at a speed of 300r / min Mix well for 12 hours. After the mixture was stirred and dried at 80°C, the temperature was raised to 950°C in a box furnace at a rate of 5°C / min and roasted at a constant temperature for 12 hours, and then slowly cooled to room temperature in the furnace to obtain white LiTi 2 (PO 4 ) 3 Particles, whose XRD patterns are shown in figure 1Shown in the curve a.

[0027] The synthesized pure LiTi 2 (PO 4 ) 3 Weigh and mix with an appropriate amount of glucose (by mass ratio 1: 0.1), and ball mill at a speed of 300r / min for 12 hours on a planetary ball mill in N 2 Under protection, heat up at 5°C / min to 700°C and roast at constant temperature for 6 hours, then slowly cool to room temp...

Embodiment 2

[0031] Will Li 2 CO 3 、TiO 2 and NH 4 h 2 PO 4 Weigh the mixed material according to the stoichiometric ratio of Li:Ti:P=1:2:3, use absolute ethanol as the dispersant, mix it according to the mass ratio of ball to material 5:1, and ball mill it on a planetary ball mill at a speed of 300r / min Mix well for 12 hours. After the mixture was stirred and dried at 80°C, the temperature was raised to 950°C in a box furnace at a rate of 5°C / min and roasted at a constant temperature for 16 hours, and then slowly cooled to room temperature in the furnace to obtain white LiTi 2 (PO 4 ) 3 particles. The synthesized pure LiTi 2 (PO 4 ) 3 Weigh and mix with an appropriate amount of glucose (by mass ratio 1: 0.1), and ball mill at a speed of 300r / min for 12 hours on a planetary ball mill in N 2 Under protection, heat up at 5°C / min to 700°C and roast at constant temperature for 6 hours, then slowly cool to room temperature in the furnace to obtain LiTi 2 (PO 4 ) 3 / C target produ...

Embodiment 3

[0033] LiOH, TiO 2 and NH 4 h 2 PO 4 Weigh the mixed material according to the stoichiometric ratio of Li:Ti:P=1:2:3, use absolute ethanol as the dispersant, mix it according to the mass ratio of ball to material 5:1, and ball mill it on a planetary ball mill at a speed of 300r / min Mix well for 12 hours. After the mixture was stirred and dried at 80°C, it was heated in a box furnace at a rate of 5°C / min to 1000°C and roasted at a constant temperature for 12 hours, and then slowly cooled to room temperature in the furnace to obtain white LiTi 2 (PO 4 ) 3 particles. The synthesized pure LiTi 2 (PO 4 ) 3 Weigh and mix with an appropriate amount of starch (by mass ratio 1: 0.1), and ball mill at a speed of 300r / min for 12 hours on a planetary ball mill in N 2 Under protection, heat up at 5°C / min to 600°C and roast at a constant temperature for 6 hours, then slowly cool to room temperature in the furnace to obtain LiTi 2 (PO 4 ) 3 / C target product, its XRD pattern see...

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Abstract

The invention relates to a titanium phosphate lithium material used for the cathode of a lithium ion battery and a preparation method thereof. The crystal structure of the titanium phosphate lithium material is an NASICON structure, and the composition is LixTi2(PO4)3, wherein x is 1 to 1.05. The preparation method of the material comprises the following steps: firstly, evenly mixing lithium-contained, titanium-contained and phosphorus-contained inorganic matter raw materials, and carrying out one-step roasting in an air atmosphere with the temperature of 800 to 1000 DEG C to prepare high-purity titanium phosphate lithium; then mixing the prepared titanium phosphate lithium with organic matter of glucose and the like in a certain proportion; milling and evenly mixing by a planet ball mill; then roasting in an inert atmosphere to obtain the carbon-cladding titanium phosphate lithium material. The preparation method is simple and has low cost, and the obtained titanium phosphate lithium cathode material has high purity, complete structure, high electrical conductivity and good electrochemical properties.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials and preparations of lithium ion batteries, in particular to a lithium titanium phosphate material used for negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] The continuous deterioration of the global environment and the continuous shortage of energy supply are the two most serious problems that mankind must face in the 21st century. The development and application of new energy and renewable clean energy has become an urgent task. Lithium-ion secondary battery, as a new type of green battery, has developed quite rapidly since it came out in 1990. Compared with commonly used secondary batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion secondary batteries have high open circuit voltage, high energy density, low self-discharge rate, long service life, no pollution a...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397C01B25/45
CPCY02E60/122Y02E60/10
Inventor 郑威曹高劭赵新兵余红明
Owner ZHEJIANG UNIV
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