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a li 3 v(moo 4 ) 3 Lithium-ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of uneven distribution of material components, long preparation time, high production costs, etc., achieve excellent electrochemical performance, and simple synthesis conditions , The effect of low production cost

Active Publication Date: 2018-01-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, Li 3 V(MoO 4 ) 3 Lithium storage characteristics at low voltage have not been developed, or its electrochemical performance is extremely poor
At the same time, currently about Li 3 V(MoO 4 ) 3 There are relatively few studies on the preparation, and there is only one preparation of Li 3 V(MoO 4 ) 3 The relevant report of the method, that is, the synthesis of Li by high-temperature solid-state reaction method 3 V(MoO 4 ) 3
This method has harsh control conditions, high energy consumption, long preparation time, high production cost, uneven distribution of components, large particles, and unstable electrochemical performance of the prepared material.

Method used

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  • a li <sub>3</sub> v(moo <sub>4</sub> ) <sub>3</sub> Lithium-ion battery negative electrode material and preparation method thereof
  • a li <sub>3</sub> v(moo <sub>4</sub> ) <sub>3</sub> Lithium-ion battery negative electrode material and preparation method thereof
  • a li <sub>3</sub> v(moo <sub>4</sub> ) <sub>3</sub> Lithium-ion battery negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A kind of Li 3 V(MoO 4 ) 3 The preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0033] 1) Lithium oxalate, vanadium pentoxide and ammonium molybdate are taken by weighing lithium oxalate, vanadium pentoxide and ammonium molybdate in the ratio of 3:1:3 by lithium: vanadium: the molar ratio of molybdenum is dissolved in alcoholic solution, then add 1.2 times of oxalic acid of theoretical amount (theoretical amount is Reducing the vanadium in the vanadium pentoxide to the +3 valence state required amount of oxalic acid) and performing ball milling at room temperature for 5 hours to prepare a submicron precursor.

[0034] 2) Divide the precursor prepared in step 1) into 5 parts, respectively, under the protection of argon inert gas at 5 ° C min -1 The heating rate was raised to 400 °C, 450 °C, 500 °C, 550 °C and 600 °C, and sintered at a constant temperature for 6 hours, and finally cooled to room temperature natural...

Embodiment 2

[0042] A kind of Li 3 V(MoO 4 ) 3 The preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0043] 1) Lithium oxalate, vanadium pentoxide and ammonium molybdate are taken by weighing lithium oxalate, vanadium pentoxide and ammonium molybdate in the ratio of 3:1:3 by the molar ratio of molybdenum: The vanadium in the vanadium pentoxide is reduced to the required amount of oxalic acid in the +3 valence state) and ball milled at room temperature for 10 hours to prepare a submicron precursor.

[0044] 2) Divide the precursor prepared in step 1) into 4 parts, and under the protection of argon inert gas, -1 The heating rate was raised to 480°C, and sintered at constant temperature for 1h, 6h, 15h, and 20h, respectively, and finally cooled to room temperature naturally to obtain Li 3 V(MoO 4 ) 3 Lithium-ion battery anode material.

[0045] The Li prepared in this embodiment at different sintering temperatures 3 V(MoO 4 ) 3 L...

Embodiment 3

[0049] A kind of Li 3 V(MoO 4 ) 3 The preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0050] 1) Lithium oxalate, vanadium pentoxide and ammonium molybdate are taken by weighing lithium oxalate, vanadium pentoxide and ammonium molybdate in the ratio of 3:1:3 by the molar ratio of molybdenum: Reducing the vanadium in vanadium pentoxide to the +3 valence state requires oxalic acid), and divided into 4 parts, and carried out normal temperature liquid phase ball milling for 2h, 5h, 10h and 15h respectively to prepare submicron precursors.

[0051] 2) The four precursors prepared in step 1) were all heated at 10°C·min under the protection of argon inert gas -1 The heating rate was increased to 480 °C, and sintered at a constant temperature for 6 hours, and finally cooled to room temperature naturally, the Li 3 V(MoO 4 ) 3 Lithium-ion battery anode material.

[0052] The Li that this embodiment is made in different millin...

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Abstract

The invention discloses a preparation method of a Li3V(MoO4)3 lithium ion battery negative electrode material. The preparation method includes the following steps that 1, a lithium source, a vanadium source and a molybdenum source are mixed according to the molar ratio of lithium to vanadium to molybdenum being 3:1:3, then a reducing agent is added for mechanical activation, and a precursor is prepared; 2, the precursor is heated to 300-650 DEG C in a non-oxidizing atmosphere, heat preservation is performed for 1-20 h, and the Li3V(MoO4)3 lithium ion battery negative electrode material is obtained. According to the preparation method, synthesis conditions are simple, the process is short, energy consumption is low, the production cost is low, high-valence vanadium can be directly reduced at normal temperature through the reducing agent to form the amorphous Li3V(MoO4)3 precursor with fine particles, uniform ingredients and stable quality in a synthesis mode, the problem that trivalent vanadium is prone to oxidization is solved, and the prepared Li3V(MoO4)3 material has excellent proprieties.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, in particular to a Li 3 V(MoO 4 ) 3 Lithium-ion battery negative electrode material and preparation method thereof. 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. At present, the negative electrode material of lithium ion battery mainly adopts graphite material. Although graphite material has good cycle stability, its capacity is low, the theoretical capacity is only 372mAh g -1 . The new generation of lithium-ion batteries puts forward higher requirements on the specific capacity of electrode materials, so finding anode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/38H01M4/131H01M10/0525
CPCH01M4/131H01M4/38H01M4/485H01M10/0525Y02E60/10
Inventor 王接喜刘朝孟彭文杰王志兴郭华军李新海胡启阳
Owner CENT SOUTH UNIV
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