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Electrochemical active material as well as preparation method and application thereof

An active material and electrochemical technology, applied in the field of carbon-free reduction-low temperature synthesis to prepare electrochemical active materials, can solve the problems of large capacity decay rate, long synthesis time, high synthesis temperature, etc., achieve short reaction time, reduce synthesis time, The effect of low synthesis temperature

Active Publication Date: 2012-08-15
赛福纳米科技(徐州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of electrochemically active material and its battery manufacturing method, which solves the problems of high capacity decay rate in the electrochemical cycle process, high synthesis temperature, long synthesis time, cumbersome operation, and causing The problem of environmental pollution

Method used

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  • Electrochemical active material as well as preparation method and application thereof
  • Electrochemical active material as well as preparation method and application thereof
  • Electrochemical active material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of the lithium vanadium phosphate composite material that embodiment 1 is mixed with nanometer Al

[0031] Preparation recipe

[0032]

[0033] Lithium dihydrogen phosphate, vanadium pentoxide, vanadium trioxide and nano-Al powder were ball milled at room temperature for 2 hours at a ratio of Li:Al:V:P element molar ratio of 3:0.1:1.9:3, under nitrogen protection conditions The materials are continuously put into the ball milling rotary furnace, the temperature is controlled at 800 degrees, the temperature is kept for 6 hours, and then cooled at room temperature. The product is obtained through milling, testing and packaging.

[0034] Sample XRD diffraction analysis: such as image 3 As shown, in the X-ray spectrum, there is no impurity phase, and it is a pure-phase monoclinic lithium vanadium phosphate.

[0035] Electrochemical performance test:

[0036] Add conductive carbon black and binder to the above-prepared lithium vanadium phosphate produ...

Embodiment 2

[0037] The preparation of the lithium vanadium phosphate composite material of embodiment 2 doping nanometer Al

[0038]

[0039]

[0040]Ammonium dihydrogen phosphate, lithium carbonate, vanadium pentoxide, vanadium trioxide and nano-Al powder were ball-milled at room temperature for 6 hours at a ratio of Li:Al:V:P element molar ratio of 3:0.2:1.8:3. Under protected conditions, the materials are continuously fed into the ball milling rotary furnace, the temperature is controlled at 700 degrees, kept for 8 hours, and then cooled at room temperature. The product is obtained through milling, testing and packaging.

[0041] Electrochemical performance test:

[0042] In the electrochemical test process, conductive carbon black and binder are added to make pole pieces, and metal lithium sheets are used as counter electrodes for electrochemical tests. The maximum discharge capacity of the material prepared in this embodiment is 167mAh / g, such as image 3 shown.

Embodiment 3

[0043] The preparation of the lithium vanadium phosphate composite material of embodiment 3 doping nanometer Al

[0044] Preparation recipe

[0045]

[0046] Ammonium dihydrogen phosphate and lithium carbonate, vanadium pentoxide, vanadium trioxide and nano-titanium powder were ball-milled at room temperature for 6 hours at a ratio of Li:Ti:V:P element molar ratio of 3:0.1:1.9:3, Under protected conditions, the materials are continuously fed into the ball milling rotary furnace, the temperature is controlled at 700 degrees, kept for 8 hours, and then cooled at room temperature. The product is obtained through milling, testing and packaging.

[0047] During the battery test process, conductive agents and binders are added, pole pieces are made, and metal lithium sheets are used as the test counter electrode. The tap density of the material prepared in this embodiment is greater than 1.2g / cm 3 , The electrochemical discharge gram capacity of the electrode material is great...

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Abstract

The invention discloses electrochemical active material and preparation method thereof. The electrochemical active material has a similar chemical formula of Li3MXV2-X(PO4)3, wherein X ranges from 0 to 1.0 and represented as a monocline in an X-ray diffraction map and belongs to a P21 / n space group. The preparation method comprises the following steps of: by using a vanadium compound, a phosphorus compound and a lithium compound as raw materials; by using nanometer metal as a reducing agent, mixing the raw materials according to the mole ratio of 2-y : 3 : 3 : y of the elements of vanadium, phosphorus, lithium and thenanometer metal, and uniformly mixing at room temperature; then calcining under inert atmosphere, and then cooling at the room temperature so as to obtain the electrochemicalactive material, wherein y ranges from 0 to 1.0. The method has low synthesis temperature, short synthesis time, non-carbon synthesis peroration, proper adopted raw materials, simple synthesis methodand easy and convenient condition control without exhaust emission; and in addition, prepared lithium vanadium phosphate as a positive pole material of a lithium ion battery has high property.

Description

technical field [0001] The invention relates to a method for manufacturing electrochemically active materials, in particular to designing a method for preparing electrochemically active materials through carbon-free reduction-low temperature synthesis. Background technique [0002] Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) is a high-performance electrochemically active material. It has a higher discharge platform; higher charge and discharge capacity, the theoretical capacity is 197mAh / g, compared with other lithium-ion battery cathode materials, it has greater energy density, good safety performance, and low price, it is considered to be the future One of the most promising cathode materials for lithium-ion batteries. However, lithium vanadium phosphate, as the positive electrode material of lithium-ion batteries, has poor crystal structure stability, rapid initial cycle attenuation, and capacity attenuation of more than 12% after 50 cycles. [0003] Chinese pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 董明苏振华
Owner 赛福纳米科技(徐州)有限公司
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