Lithium ion battery Li3MnO4 positive material doped with vanadium and preparation method thereof

A technology of lithium ion battery and positive electrode material, which is applied to battery electrodes, circuits, electrical components, etc., to achieve the effect of improving discharge performance and reducing impedance

Inactive Publication Date: 2013-11-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in existing materials, and provides a lithium-ion battery Li 3 MnO 4 Cathode material and its preparation method successfully improved Li 3 MnO 4 The electrical conductivity of the material, thereby improving the discharge specific capacity of the material

Method used

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  • Lithium ion battery Li3MnO4 positive material doped with vanadium and preparation method thereof
  • Lithium ion battery Li3MnO4 positive material doped with vanadium and preparation method thereof
  • Lithium ion battery Li3MnO4 positive material doped with vanadium and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Li 3 Mn 0.9 V 0.1 O 4 Preparation

[0028] KMnO 4 The solution is converted to LiMnO through lithium cation exchange resin 4 Solution, then LiMnO 4 LiMnO is obtained after the solution is vacuum dried at 50℃ for 24h 4 ·3H 2 O powder. Weigh LiOH·H with a molar ratio of 2.1:0.9:0.1 2 O, LiMnO 4 ·3H 2 O and NH 4 VO 3 Mix and grind, calcine in a tube furnace with oxygen atmosphere, grind at 70~120℃ every 10℃, grind at 125℃, keep for 1 hour, then heat to 170℃ and keep for 2.5h to synthesize Li 3 Mn 0.9 V 0.1 O 4 Cathode material. Using the synthetic material as the positive electrode and the lithium sheet as the negative electrode, electrochemical tests and charge-discharge tests were carried out. Its discharge capacity is 123mAh / g at a current density of 7mA / g, which is an increase of 13mAh / g compared to the undoped material.

Embodiment 2

[0029] Example 2: Li 3 Mn 0.8 V 0.2 O 4 Preparation

[0030] KMnO 4 The solution is converted to LiMnO through lithium cation exchange resin 4 Solution, then LiMnO 4 LiMnO is obtained after the solution is vacuum dried at 50℃ for 24h 4 ·3H 2 O powder. Weigh LiOH·H in a molar ratio of 2.2:0.8:0.2 2 O, LiMnO 4 ·3H 2 O and NH 4 VO 3 Mix and grind, calcine in a tube furnace with oxygen atmosphere, grind at 70~120℃ every 10℃, grind at 125℃, keep for 1 hour, then heat to 170℃ and keep for 2.5h to synthesize Li 3 Mn 0.8 V 0.2 O 4 Cathode material. Using the synthetic material as the positive electrode and the lithium sheet as the negative electrode, electrochemical tests and charge-discharge tests were carried out. Its discharge capacity is 137mAh / g at a current density of 7mA / g, which is an increase of 27mAh / g over the undoped material.

Embodiment 3

[0031] Example 3: Li 3 Mn 0.7 V 0.3 O 4 Preparation

[0032] KMnO 4 The solution is converted to LiMnO through lithium cation exchange resin 4 Solution, then LiMnO 4 LiMnO is obtained after the solution is vacuum dried at 50℃ for 24h 4 ·3H 2 O crystal powder. Weigh LiOH·H in a molar ratio of 2.3:0.7:0.3 2 O, LiMnO 4 ·3H 2 O and NH 4 VO 3 Mix and grind, calcine in a tube furnace with oxygen atmosphere, grind at 70~120℃ every 10℃, grind at 125℃, keep for 1 hour, then heat to 170℃ and keep for 2.5h to synthesize Li 3 Mn 0.7 V 0.3 O 4 Cathode material. Using the synthetic material as the positive electrode and the lithium sheet as the negative electrode, electrochemical tests and charge-discharge tests were carried out. Its discharge capacity is 153mAh / g at a current density of 7mA / g, which is 43mAh / g higher than that of the undoped material.

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Abstract

The invention relates to a lithium ion battery Li3MnO4 positive material doped with vanadium and a preparation method thereof. The chemical formula of the lithium ion battery Li3MnO4 positive material is Li3Mn(1-x)VxO4, wherein x is more than or equal to 0.1 and smaller than or equal to 0.4. The preparation method comprises the following steps: 1) converting a KMnO4 solution into a LiMnO4 solution through lithium cation exchange resin, carrying out vacuum drying on the LiMnO4 solution to obtain LiMnO4.3H2O powder; 2) according to the stoichiometric ratio, weighing a lithium source, a manganese source and a vanadium source, fully mixing and grinding, calcining, grinding for one time at an interval being every 10DEG C in a range from 70 to 120DEG C, carrying out heat preservation for 1 hour after grinding at 125DEG C; raising the temperature to 170 DEG C and carrying out the heat preservation for 2.5 hours. The preparation method disclosed by the invention has the characteristics that (1) the preparation method has a simple process and a short reaction period, saves the cost and is easy to control; (2) through the doping of appropriate amount of the vanadium, the impedance is reduced to a certain extent, so that the discharge performance of the material is improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and specifically relates to a vanadium-doped lithium ion battery Li 3 MnO 4 Cathode material and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge time, no memory effect, low environmental pollution, fast charging, etc., and are widely used in mobile communications and other fields. In recent years, with the increasingly prominent energy and environmental issues and the rapid development of modern technology, people have put forward higher requirements for the energy density of lithium-ion battery cathode materials. Therefore, high theoretical capacity cathode materials have attracted widespread attention from researchers. [0003] In 2007, Juliette A. Saint et al. reported (Journal of Power Sources, 172(1):189-197) that Li 3 MnO 4 In terms of charging, the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 余志勇刘韩星解淑晶吴莎王壮郑振宁
Owner WUHAN UNIV OF TECH
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