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Preparation method of composite cathode material Li3V(MoO4)3/LiVOMoO4

A negative electrode material, mechanical activation technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor cycle performance and rate performance, harsh preparation method control conditions, uneven distribution of material components, etc., to achieve improved electrochemical performance , Improve the stability of the interface, the effect of good consistency

Active Publication Date: 2016-02-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 3 V(MoO 4 ) 3 As a polyanionic anode material, its electronic conductivity is low, and its cycle performance and rate performance are poor, which limits its application in lithium-ion battery anode materials.
Moreover, the existing preparation methods have harsh control conditions, high energy consumption, long preparation time, and high production costs. The prepared materials have uneven distribution of components, large particles, and unstable electrochemical properties.

Method used

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  • Preparation method of composite cathode material Li3V(MoO4)3/LiVOMoO4
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  • Preparation method of composite cathode material Li3V(MoO4)3/LiVOMoO4

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Embodiment 1

[0036] A kind of composite anode material Li of the present invention 3 V(MoO 4 ) 3 / LiVOMoO 4 The preparation method comprises the following steps:

[0037] (1) by lithium, vanadium, molybdenum element molar ratio is 3:1:3, takes by weighing lithium oxalate, vanadium pentoxide and ammonium molybdate and mixes, then adds excessive 20% citric acid as reducing agent (citric acid The addition amount of +5 valent alum is reduced to + 1.2 times of the required theoretical amount of valence alum), with alcohol solution as dispersant, fully mix again, the mixed solution that obtains is joined in the ball mill tank (in the mixed solution The relative ratio of the mass of the mixture to the volume of ethanol is 0.68gmL -1 ) performing liquid phase ball milling for 8 hours to obtain a submicron reactant precursor;

[0038] (2) Divide the reactant precursor obtained by mechanical activation in step (1) into 4 parts. -1 The heating rate is raised to 300°C for 2 hours, then heated to...

Embodiment 2

[0046] A kind of composite anode material Li of the present invention 3 V(MoO 4 ) 3 / LiVOMoO 4 The preparation method comprises the following steps:

[0047] (1) be 3:1:3 by lithium, vanadium, molybdenum element mol ratio, take by weighing lithium acetate, ammonium metavanadate and sodium molybdate and mix, then add excessive 20% oxalic acid as reducing agent (addition of oxalic acid The amount is 1.2 times that the +5-valent alum is reduced to the required theoretical amount of +3-valent alum), with the alcohol solution as a dispersant, fully mixed again, and the mixed solution obtained is added to the ball mill tank (the mixture in the mixed solution The relative ratio of mass to volume of ethanol is 0.68gmL -1 ), carry out liquid phase ball milling 8h, obtain submicron reactant precursor;

[0048] (2) Divide the reactant precursor obtained by mechanical activation in step (1) into 4 parts. -1 The heating rate was increased to 300 ° C for 2 h, then heated to 600 ° C, s...

Embodiment 3

[0053] A kind of composite anode material Li of the present invention 3 V(MoO 4 ) 3 / LiVOMoO 4 The preparation method comprises the following steps:

[0054] (1) According to lithium, vanadium, molybdenum element molar ratio is 3:1:3, take by weighing 4 parts of lithium carbonate, vanadium peroxyoxalate and molybdenum trioxide with equal mass, and superconducting carbon black of excess 20% as reducing agent (the addition of superconducting carbon black is 1.2 times of the theoretical amount needed to reduce the +5-valent alum to +3-valent alum), with the alcohol solution as the dispersant, fully mixed, the mixed solution obtained is added to the ball mill tank (in the mixed solution, the volume ratio of the mixture mass to ethanol is 0.68gmL -1 ), respectively carrying out liquid phase ball milling for 4h, 6h, 8h and 10h to obtain the submicron reactant precursor;

[0055] (2) The reactant precursor obtained by mechanical activation in step (1) was first heated at 10°C fo...

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Abstract

The invention discloses a preparation method of a composite cathode material Li3V(MoO4)3 / LiVOMoO4. The preparation method comprises mixing a Li source, a V source and a Mo source according to a mole ratio of Li, V to Mo of 3-1: 1: 3-1 to obtain a uniform mixture, adding a reducer and a dispersant into the mixture, carrying out mechanical activation at a normal temperature, and sintering the product subjected to mechanical activation in an inert atmosphere to obtain the composite cathode material Li3V(MoO4)3 / LiVOMoO4. The preparation method creatively utilizes Li3V(MoO4)3 and LiVOMoO4 to prepare the composite material. The composite material has lithium insertion / extraction properties at low potential (~0.5V vs. Li<+> / Li), can be used as a lithium ion battery cathode, has a high reversible specific discharge capacity several times higher than that of the existing cathode material, has main capacity at low potential and has a good cathode application prospect.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a novel composite negative electrode material Li 3 V(MoO 4 ) 3 / LiVOMoO 4 method of preparation. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile devices such as mobile phones and notebook computers. As a power battery, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. However, as people's requirements for long cruising range are increasing, the current level of development of lithium-ion batteries is difficult to meet human needs, and it is particularly urgent to develop lithium-ion batteries with high energy density. The key component currently restricting the energy density of lithium ions is the electrode material. At present, the negative electrode material of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/1391
CPCH01M4/1391H01M4/362H01M4/485Y02E60/10
Inventor 彭文杰刘朝孟王接喜王志兴郭华军李新海胡启阳
Owner CENT SOUTH UNIV
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