CN102364728B - A kind of positive electrode material of lithium ion battery and preparation method thereof - Google Patents
A kind of positive electrode material of lithium ion battery and preparation method thereof Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000007774 positive electrode material Substances 0.000 title claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910003481 amorphous carbon Inorganic materials 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims description 21
- 238000001354 calcination Methods 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000010406 cathode material Substances 0.000 claims 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 150000003682 vanadium compounds Chemical class 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000035484 reaction time Effects 0.000 abstract description 3
- 229910021541 Vanadium(III) oxide Inorganic materials 0.000 description 52
- 238000010792 warming Methods 0.000 description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 239000004570 mortar (masonry) Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000010405 anode material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 239000007772 electrode material Substances 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 239000011149 active material Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910012820 LiCoO Inorganic materials 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002070 nanowire Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical group Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
本发明涉及一种锂离子电池正极材料及其制备方法，该材料为多孔的五氧化二钒并且在五氧化二钒表面有一层非晶的碳层，五氧化二钒的质量百分含量是80-99.9％，碳的制备百分含量为0.1-20％。与现有技术相比，本发明具有制备工艺程序简单，反应时间短，生产成本低等优点。
The invention relates to a positive electrode material of a lithium ion battery and a preparation method thereof. The material is porous vanadium pentoxide and has an amorphous carbon layer on the surface of the vanadium pentoxide, and the mass percentage of the vanadium pentoxide is 80% -99.9%, the percentage content of carbon preparation is 0.1-20%. Compared with the prior art, the invention has the advantages of simple preparation process, short reaction time, low production cost and the like.
Description
Technical field
The present invention relates to a kind of anode material for lithium-ion batteries and preparation method thereof, particularly a kind of preparation method corresponding to anode material for lithium-ion batteries porous vanadic oxide.
Background technology
Lithium ion battery has high-energy-density, high power density, and operating voltage is high, lightweight, have extended cycle life the advantages such as security performance is good, memory-less effect.As a kind of Novel energy storage apparatus, the exploitation of lithium ion battery and lithium ion battery energy storage system will promote effective utilization of regenerative resource and the development of new-energy automobile, and energy shortage and environmental contamination reduction are significant for solving.Further improving performance of lithium ion battery, reducing cost is the prerequisite that realizes its effective application.Electrode material is the key factor that affects performance of lithium ion battery and cost as the important component part of lithium ion battery.More than ten years in the past, the research of anode material for lithium-ion batteries mainly concentrated on the LiCoO of spinel structure
2, LiMn
2O
4LiFePO with olivine structural
4And their derivative.LiCoO
2Be first business-like positive electrode, but its active volume is lower than 150mAh g
-1, otherwise Li
1-xCoO
2Structure is unstable, LiCoO
2Easily and electrolyte generation redox reaction, cause irreversible capacity loss and safety problem; In addition, cobalt resource is limited, expensive.LiFePO
4Be to study now the hottest positive electrode, its theoretical capacity only has 170mAh g
-1, can not satisfy energy-storage system to the needs of lithium battery.So high power capacity, long-life, high security, the cheaply exploitation of electrode material are the emphasis of lithium battery area research.
Vanadic oxide has layer structure, and space between layers can hold the lithium ion that embeds in the discharge process, and structure significant change can not occur.In addition, vanadium is rich content in the earth's crust, and is cheap.Therefore, vanadium base electrode material has LiCoO at cost
2Incomparable advantage has become forward position and the focus in Study on Li-ion batteries using field.Yet the layer structure stability of oxyvanadium compound and lithium vanadate is not good enough, and in charge and discharge process, the repeatedly phase transformation that lithium ion embedded/took off the embedding process makes the capacity attenuation of material very fast, and cycle performance is poor; And being not suitable for high current charge-discharge, multiplying power property is poor.These drawbacks limit of vanadic oxide its commercial applications.
People attempt by the pattern that changes material, reduce the performance that particle size improves the vanadic oxide electrode material.For example, vanadic oxide is made nano material.The people such as Martin have synthesized the V of different-diameter take porous carbon acid esters film as template with sol-gal process
2O
5Nano wire finds that diameter shows outstanding low temperature electrochemical performance (Sides, C.R. less than the nano wire of 70nm; Martin, C.R., Adv Mater, 2005,17,125.).Yet multiplying power property and the cyclical stability of the vanadium pentoxide nanometer material of bibliographical information and prior art are all poor at present, and experimentation is complicated, and condition is wayward, and synthetic cost is high.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of preparation technology's program simple for the defective that overcomes above-mentioned prior art existence, and the reaction time is short, anode material for lithium-ion batteries that production cost is low and preparation method thereof.
Purpose of the present invention can be achieved through the following technical solutions: a kind of anode material for lithium-ion batteries, it is characterized in that, this material is the vanadic oxide of porous and the carbon-coating that one deck amorphous is arranged on the vanadic oxide surface, the quality percentage composition of vanadic oxide is 80-99.9%, and the preparation percentage composition of carbon is 0.1-20%.
A kind of preparation method of anode material for lithium-ion batteries is characterized in that, the method may further comprise the steps:
(1) vanadium source and porous hard template are ground until color is even, the gained mix powder is put into quartz boat, places tube furnace, and under inert gas shielding, high temperature sintering obtains the compound of vanadium and the compound of porous hard template after being cooled to room temperature;
(2) the resulting compound of step (1) is placed Muffle furnace, calcine in air, the product that obtains cools off, and obtains the vanadic oxide of the porous of demoulding plate.
The described vanadium of step (1) source is VO, VO
2, V
2O
5, V
2O
3Or NH
4VO
3A kind of or its combination.
The described porous hard template of step (1) refers to: a kind of or its combination of mesoporous carbon, active carbon, carbon nano-tube.
The described high temperature sintering of step (1) refers to begin to be warming up to 600-900 ℃ with the programming rate of 1-10 ℃/min from room temperature, and constant temperature 10 minutes to 20 hours.
The described inert gas of step (1) refers to a kind of or its mixing in nitrogen or the argon gas.
The described calcining in air of step (2) refers to begin to be warming up to 300-680 ℃ with the programming rate of 1-10 ℃/min from room temperature, and constant temperature 10-720 minute.
Compared with prior art, the present invention directly mixes vanadium source and porous hard template, makes the melting of vanadium source by the high-temperature roasting under inert gas shielding, enters into the duct of porous hard template, removes the porous hard template and obtains the porous vanadic oxide.The loose structure of product can improve its surface area, increases the activated centre; Pore passage structure is conducive to transporting of lithium ion and electrolyte solution, has accelerated mass transport process; Thinner hole wall has shortened the diffusion length of lithium ion, has guaranteed that lithium ion embeds fast and takes off embedding, and these all are conducive to improve the multiplying power property of material.The vanadic oxide of high-temperature roasting method preparation has good crystallinity, simultaneously, vanadic oxide surface after the roasting is the very thin agraphitic carbon of residual one deck still, increased the conductivity of product, and stoped the polymerization of vanadic oxide material, thereby improved capacity and the cyclical stability of product.
Preparation technology's program of the present invention is simple, and the reaction time is short, and production cost is low.The electrode material good cycle that the method synthesizes, long service life is applicable to large-scale industrial production.
Description of drawings
Fig. 1 is the XRD diffraction pattern of positive active material vanadic oxide of the present invention;
Fig. 2 is that positive active material vanadic oxide of the present invention amplifies 400000 times TEM figure;
Fig. 3 is the chemical property of positive active material vanadic oxide of the present invention;
Fig. 4 is the impedance diagram of positive active material vanadic oxide of the present invention and raw material vanadic oxide.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
1. the vanadic oxide with 1.0g at room temperature mixes with the mesoporous carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under the protection of inert nitrogen gas, begin programming rate with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and mesoporous carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 650 ℃ of calcinings and 650 ℃ of calcining at constant temperature 40 minutes air, remove the vanadic oxide that mesoporous carbon obtains porous.
Embodiment 2:
1. the vanadic oxide with 1.0g at room temperature mixes with the mesoporous carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under the protection of inert nitrogen gas, begin programming rate with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and mesoporous carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 600 ℃ of calcinings and 600 ℃ of calcining at constant temperature 45 minutes air, remove the vanadic oxide that mesoporous carbon obtains porous.
Embodiment 3:
1. the ammonium metavanadate with 1.0g at room temperature mixes with the mesoporous carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under the protection of inert nitrogen gas, begin programming rate with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and mesoporous carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 650 ℃ of calcinings and 650 ℃ of calcining at constant temperature 45 minutes air, remove the vanadic oxide that mesoporous carbon obtains porous.
Embodiment 4:
1. the vanadic oxide with 1.0g at room temperature mixes with the mesoporous carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under vacuum atmosphere, begin intensification with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and mesoporous carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 600 ℃ of calcinings and 600 ℃ of calcining at constant temperature 40 minutes air, remove the vanadic oxide that mesoporous carbon obtains porous.
Embodiment 5:
1. the vanadic oxide with 1.0g at room temperature mixes with the active carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under vacuum atmosphere, begin programming rate with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and active carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 650 ℃ of calcinings and 650 ℃ of calcining at constant temperature 45 minutes air, remove the vanadic oxide that active carbon obtains porous.
Embodiment 6:
1. the ammonium metavanadate with 1.0g at room temperature mixes with the active carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace, under the protection of inert nitrogen gas, begin programming rate with 5 ℃/min from room temperature and be warming up to 750 ℃ and at 20 minutes high temperature sinterings of 750 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and active carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 5 ℃/min from room temperature and be warming up to 600 ℃ of calcinings and 600 ℃ of calcining at constant temperature 45 minutes air, remove the vanadic oxide that active carbon obtains porous.
Embodiment 7:
1. the VO with 1.0g at room temperature mixes with the active carbon of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace; under the protection of inert nitrogen gas, begin programming rate with 10 ℃/min from room temperature and be warming up to 900 ℃ and at 10 minutes high temperature sinterings of 900 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and active carbon after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 10 ℃/min from room temperature and be warming up to 680 ℃ of calcinings and 680 ℃ of calcining at constant temperature 720 minutes air, remove active carbon and obtain the porous vanadic oxide that there is one deck amorphous carbon layer on the surface, wherein the quality percentage composition of vanadic oxide is 99.9%, and Carbon Content is 0.1%.
Embodiment 8:
1. the VO with 1.0g at room temperature mixes with the carbon nano-tube of 1.0g, and grinds until color is even with mortar.Then powder is placed tube furnace; under the protection of inert gas argon gas, begin programming rate with 1 ℃/min from room temperature and be warming up to 600 ℃ and at 20 hours high temperature sinterings of 600 ℃ of constant temperature, be cooled to the compound that obtains vanadic oxide and carbon nano-tube after the room temperature.
2. resulting compound is placed Muffle furnace, begin programming rate with 1 ℃/min from room temperature and be warming up to 300 ℃ of calcinings and 300 ℃ of calcining at constant temperature 10 minutes air, remove active carbon and obtain the porous vanadic oxide that there is one deck amorphous carbon layer on the surface, wherein the quality percentage composition of vanadic oxide is 80%, and Carbon Content is 20%.
Shown in Fig. 1-4, the below carries out performance test with the obtained product of above-described embodiment, illustrates after employing positive active material porous vanadic oxide provided by the invention is prepared into battery battery is carried out performance test.
Electrochemical property test:
(1) preparation of battery
Need make the coin shape lithium battery before the electrochemical property test of sample, sample serves as the positive electrode of electrode in the lithium battery, and the lithium sheet is as negative pole.Make flow process and be divided into preliminary treatment, slurry making, electrode fabrication, battery assembling Four processes.Synthetic sample porous vanadic oxide (60%) is mixed (mass ratio) fully to be stirred with conductive agent acetylene black (30%), adhesive Kynoar (10%), be uniformly coated on and place vacuum drying chamber on the aluminium foil, 100 ℃ of vacuumize 12 hours, be cut into the positive plate of button cell after the oven dry, compressing tablet, pressure are approximately used 3-5 atmospheric pressure.Weighing scribbles the electrode slice weight of active material, according to the weight of blank aluminium foil before the smear and the ratio of active material, puts into glove box after calculating the weight of contained active material in each electrode slice.
Adopt metal lithium sheet to make negative pole, 1molL
-1LiPF
6-EC+DMC (volume ratio 1: 1) solution is made electrolyte.Carry out in the glove box that is assembled in the anhydrous and oxygen-free that is full of argon gas of button cell. battery pack process of assembling 1) electrode slice is placed on the battery case middle, drip 2 electrolyte; 2) with barrier film entirely being layered on the electrode slice gently; 3) draw a small amount of electrolyte with dropper, drip 1 to 2 electrolyte until barrier film is all wetting from direction of diaphragm edge; 4) metal lithium sheet is placed on the central authorities of barrier film, can not directly contacts battery case; 5) again nickel foam is placed the central authorities of lithium sheet; 6) cover battery cover, firmly by tight, namely assemble completely with the sealing machine sealed cell, leave standstill after a period of time to be measured.
(2) electrochemical property test
The constant current charge-discharge loop test of sample carries out at the LAND-201A battery test system, and the test voltage scope is 2.0-4.0V; Electrochemical impedance carries out at CHI600B type electrochemical workstation (Shanghai occasion China instrument company).
Can find out that according to the XRD diffraction pattern of Fig. 1 positive active material vanadic oxide vanadic oxide is pure phase, higher crystallinity is arranged, and the vanadic oxide of the rhombic form of diffraction peak and standard is consistent, (JCPDSNo.41-1426, space group is Pmnm, cell parameter:
). the TEM figure according to 400000 times of Fig. 2 positive active material vanadic oxide amplifications can find out that hole dimension is 4-7nm, and at material surface very thin carbon-coating is arranged, chemical property figure according to Fig. 3 positive active material vanadic oxide can find out in current density 1.0,2.0,5.0and 10Ag
-1The time, the specific discharge capacity of material is respectively 305,255, and 168 and 130mAh g
-1, behind charge and discharge cycles 50 circles, 1.0Ag
-1Capacity still remains on 288mAh g
-1This shows that the positive electrode active materials vanadic oxide has very high specific capacity and good cyclical stability, can find out that according to the impedance diagram of Fig. 4 positive active material vanadic oxide and raw material vanadic oxide the positive electrode active materials vanadic oxide obviously reduces than general commercial vanadic oxide resistance, the activity when lithium ion insertion embedding goes out significantly improves.
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| CN104466102B (en) * | 2014-11-13 | 2017-07-18 | 湘潭大学 | A kind of porous V2O5/C complex microspheres of positive electrode material of lithium secondary cell and preparation method thereof |
| CN105742614A (en) * | 2014-12-08 | 2016-07-06 | 宁德时代新能源科技股份有限公司 | vanadium pentoxide positive electrode material and preparation method thereof |
| CN110697799A (en) * | 2019-10-16 | 2020-01-17 | 河南电池研究院有限公司 | A kind of preparation method of positive electrode material of porous lithium ion battery |
| CN118825249B (en) * | 2024-09-19 | 2024-12-06 | 中南大学 | Amorphous carbon coated porous cellular VO2/V2O5Composite material, preparation method and application thereof |
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