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Modified lithium vanadate material and modification method thereof, and application of modified lithium vanadate material in lithium ion batteries

A modified and solid technology, applied in the field of electrochemistry, can solve the problems of reducing the volume energy density of electrodes, reducing the quality of active material loading, increasing side reactions, etc., to avoid negative effects, improve kinetic performance and lithium storage capacity, The effect of simple operation process

Active Publication Date: 2015-11-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an anode material for lithium-ion batteries, Li 3 VO 4 Intrinsic conductivity is extremely low, usually people prepare Li 3 VO 4 Hollow micro-nanostructures or the Li 3 VO 4 Composite with carbon materials to improve Li 3 VO 4 Conductivity, see Nanolett.2013,13,4715; Chem.Commun.2015,51,229; NanoEnergy2015,12,709; Nanoscale2014,6,11072
However, the use of hollow micro-nano structures in lithium-ion batteries has the negative effect of reducing the loading quality of active materials, and its larger specific surface area compared with solid structures also leads to increased side reactions; although the composite of carbon materials can effectively Improve the conductivity of the material, but the introduction of carbon materials will reduce the volumetric energy density of the electrode

Method used

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  • Modified lithium vanadate material and modification method thereof, and application of modified lithium vanadate material in lithium ion batteries
  • Modified lithium vanadate material and modification method thereof, and application of modified lithium vanadate material in lithium ion batteries
  • Modified lithium vanadate material and modification method thereof, and application of modified lithium vanadate material in lithium ion batteries

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Experimental program
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Embodiment 1

[0037] A modified Li 3 VO 4-δ The modification method of material comprises steps as follows:

[0038] (1) Take Li 3 VO 4 The sample is placed in a porcelain boat and placed in a tube furnace. The tube furnace is evacuated by a vacuum pump, and argon gas is introduced to remove oxygen. The operation is repeated three times, and then the vacuum is pumped again to keep the vacuum degree in the tube furnace at 10 -3 Pa,

[0039] (2) Heating up to 550°C, calcining at 550°C for 2 hours, and cooling to room temperature naturally to prepare modified Li 3 VO 4-δ Material.

[0040] The prepared modified Li 3 VO 4-δ The interior of the material particles is in a solid crystalline state, and an amorphous layer is wrapped on the outer surface of the solid crystalline state, and the thickness of the amorphous layer is 5nm.

[0041] Control sample: Li without process of the method of the present invention 3 VO 4 The sample, that is, the unmodified Li 3 VO 4 sample.

[0042] Pe...

Embodiment 2

[0047] A modified Li 3 VO 4-δ The modification method of material comprises steps as follows:

[0048] (1) Take Li 3 VO 4 The sample is placed in a porcelain boat and placed in a tube furnace. The tube furnace is evacuated by a vacuum pump, and argon gas is introduced to remove oxygen. The operation is repeated three times, and then the vacuum is pumped again to keep the vacuum degree in the tube furnace at 10 -2 Pa,

[0049] (2) Heating up to 700°C, calcining at 700°C for 5 hours, and cooling to room temperature naturally to prepare modified Li 3 VO 4-δ Material, modified Li 3 VO 4-δ The interior of the material particles is in a solid crystalline state, and an amorphous layer is wrapped on the outer surface of the solid crystalline state, and the thickness of the amorphous layer is 6nm.

Embodiment 3

[0051] A modified Li 3 VO 4-δ The modification method of material comprises steps as follows:

[0052] (1) Take Li 3 VO 4 The sample is placed in a porcelain boat and placed in a tube furnace. The tube furnace is evacuated by a vacuum pump, and argon gas is introduced to remove oxygen. The operation is repeated three times, and then the vacuum is pumped again to keep the vacuum degree in the tube furnace at 10 -5 Pa,

[0053] (2) Heating up to 450°C, calcining at 450°C for 1 hour, and cooling to room temperature naturally to prepare modified Li 3 VO4-δ Material, modified Li 3 VO 4-δ The interior of the material particles is in a solid crystalline state, and an amorphous layer is wrapped on the outer surface of the solid crystalline state, and the thickness of the amorphous layer is 2nm.

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Abstract

The invention relates to a modified lithium vanadate material and a modification method thereof, and application of the modified lithium vanadate material in lithium ion batteries. The modified lithium vanadate material is prepared by calcining a Li3VO4 sample at 300-800 DEG C under vacuum conditions for 1-10 hours. The method is simple and easy to implement, does not perform any control or coating on the shape and size of the Li3VO4, avoids the negative effects caused by introduction of the carbon material or other substances, and can easily implement industrial production. A lithium storage electrode prepared by using Li3VO4-delta as the active substance has the advantages of high electrochemical lithium storage reversible capacity and excellent cycle performance. Under the conditions of the current density of 200 mA g<-1> and the voltage of 0.2-3.0V, the first charge / discharge specific capacity of the Li3VO4-delta is up to 416 / 326 mAh g<-1>, the first coulomb efficiency is 78%, and the capacity is still 286 mAh g<-1> after 200 cycles.

Description

Technical field: [0001] The invention relates to a modified lithium vanadate (Li 3 VO 4-δ ) materials, modification methods and applications in lithium ion batteries, which belong to the technical field of electrochemistry. Background technique: [0002] As a clean and reliable energy storage technology, lithium-ion batteries are widely used in many fields. With the development of various electrical equipment, higher requirements are put forward for the rate performance and energy density of lithium-ion batteries. In commercial lithium-ion batteries, traditional graphite anode materials can no longer meet the increasing requirements of the public. Graphite with a lower capacity than the theoretical one (372mAhg -1 ), the theoretical specific capacity of negative electrode materials that store lithium through alloy mechanisms (such as elemental silicon, elemental tin, etc.) and redox mechanisms (such as various transition metal oxides) is 2-3 times that of graphite materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/58H01M10/0525
CPCY02E60/10
Inventor 杨剑钱逸泰陈良
Owner SHANDONG UNIV
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