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Carbon-coated Li3VO4 lithium ion battery anode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of simple synthesis process, high charge and discharge capacity, and excellent cycle performance

Active Publication Date: 2014-12-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, carbon-coated Li 3 VO 4 The preparation of the composite structure and its application in lithium-ion batteries have not been reported yet

Method used

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  • Carbon-coated Li3VO4 lithium ion battery anode material and preparation method thereof
  • Carbon-coated Li3VO4 lithium ion battery anode material and preparation method thereof
  • Carbon-coated Li3VO4 lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 1mmol of vanadium pentoxide, 3mmol of lithium carbonate and 5mmol of hexamethylenetetramine into a beaker, add an appropriate amount of distilled water and stir evenly, transfer to a hydrothermal ax to react at 140°C for 24 hours, transfer the resulting solution to the beaker and Add 0.05mmol citric acid, stir well and dry. Place the dried product in a crucible, move the crucible into a high-temperature tube furnace, calcinate at 550°C for 5 hours under nitrogen, and cool naturally to obtain carbon-coated Li 3 VO 4 sample. The results show that the prepared sample is located at 16.3 through XRD pattern analysis o , 21.6 o , 22.9 o , 24.4 o , 28.2 o , 32.8 o , 36.3 o , 37.6 o , 49.8 o , 58.7 o , 66.2 o and 70.9 o The diffraction peaks at correspond to the orthorhombic Li 3 VO 4 (100), (110), (011), (101), (111), (200), (002), (201), (202), (320) of (XRD card JCPDS, No. 38-1247) ), (203) and (322) crystal planes. The prepared sample was analyzed ...

Embodiment 2

[0020] Weigh 1mmol of vanadium pentoxide, 3mmol of lithium carbonate and 5mmol of hexamethylenetetramine into a beaker, add an appropriate amount of distilled water and stir evenly, transfer to a hydrothermal ax to react at 140°C for 24 hours, transfer the resulting solution to the beaker and Add 0.05mmol citric acid, stir well and dry. Place the dried product in a crucible, move the crucible into a high-temperature tube furnace, calcinate at 500°C for 5 hours under nitrogen, and cool naturally to obtain carbon-coated Li 3 VO 4 sample. The results show that the as-prepared carbon coated Li 3 VO 4 Nanoparticles used as lithium-ion battery anode materials show that the first charge and discharge capacities are 355 and 445 mAh / g, and after 100 cycles, the charge and discharge capacities are both 419 and 420 mAh / g, showing a higher specific capacity and better Cycle stability.

Embodiment 3

[0022] Weigh and weigh 1mmol of vanadium pentoxide, 3mmol of lithium carbonate and 5mmol of hexamethylenetetramine into a beaker, add an appropriate amount of distilled water and stir evenly, transfer to a hydrothermal ax to react at 140°C for 24 hours, and transfer the resulting solution to the beaker And add 0.05mmol citric acid, fully stir and dry. Place the dried product in a crucible, move the crucible into a high-temperature tube furnace, calcinate at 600°C for 5 hours under nitrogen, and cool naturally to obtain carbon-coated Li 3 VO 4 sample. The results show that the as-prepared carbon coated Li 3 VO 4 Nanoparticles as lithium-ion battery anode materials show the first charge and discharge capacities of 494 and 620 mAh / g, and after 100 cycles, the charge and discharge capacities are both 496 and 498 mAh / g, showing high specific capacity and excellent cycle stable performance.

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Abstract

The invention provides a carbon-coated Li3VO4 lithium ion battery anode material. The anode material is prepared according to the following method: employing vanadium pentoxide, lithium carbonate and hexamethylene tetramine as raw materials, performing a hydrothermal reaction to obtain an intermediate-phase solution, then adding citric acid into the intermediate-phase solution, mixing uniformly, and drying to obtain a solid product, and sintering the solid product in a high-temperature atmosphere, so as to obtain the lithium ion battery anode material with the Li3VO4 surface coated by amorphous carbon. The anode material is granular, and has the particle size of 90-120 nm. The carbonization effect of citric acid is utilized for fining Li3VO4 particles and uniformly coating the particle size with a carbon layer. The synthetic technology simple and easy to operate, and the material preparation cost is low. The prepared sample Li3VO4 is a uniform nano-particle, and has the dimension of 90-120 nm. In the obtained sample, the Li3VO4 particle surface is uniformly coated by amorphous carbon. The prepared material is high in charge / discharge capacity and excellent in cycle performance.

Description

technical field [0001] The invention relates to a class of novel lithium-ion battery composite negative electrode materials, in particular to a carbon-coated Li 3 VO 4 The preparation technology of the composite material and its lithium storage characteristics belong to the field of new electrochemical materials. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low-temperature performance, no memory, and no pollution. They have been widely used in mobile communication devices such as notebook computers and mobile phones Among them, it also has broad application prospects in future electric vehicles such as electric vehicles and electric bicycles. A key factor affecting the development of lithium-ion batteries lies in the development and application of positive and negative electrode materials. Li 3 VO 4 As a new type of ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 倪世兵吕小虎杨学林
Owner CHINA THREE GORGES UNIV
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