CN101304089B - Phosphorizing nickel cathode material for lithium ion battery and preparation method thereof - Google Patents
Phosphorizing nickel cathode material for lithium ion battery and preparation method thereof Download PDFInfo
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- CN101304089B CN101304089B CN2008100396018A CN200810039601A CN101304089B CN 101304089 B CN101304089 B CN 101304089B CN 2008100396018 A CN2008100396018 A CN 2008100396018A CN 200810039601 A CN200810039601 A CN 200810039601A CN 101304089 B CN101304089 B CN 101304089B
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- lithium ion
- ion battery
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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
The invention relates to a nickel-phosphide cathode material used in a lithium ion battery, belonging to the technical field of electrochemistry. The material is in the form of a film and is prepared and obtained through reactive pulse laser precipitation. The electrode made by the film has good charging and discharging circulation reversibility. The reversible specific capacity of the electrode made by Ni2P film is about 400mAh/g. The Ni2P electrode material has the advantages of good chemical stability, high specific capacity and simple preparation method and is applicable to lithium ion batteries.
Description
Technical field
The invention belongs to technical field of electrochemistry, be specifically related to a class and be used for cathode material of lithium ion battery and preparation method thereof.
Background technology
Lithium ion battery is the vital power supply of notebook computer, camera, mobile phone and other Communication Equipment, and might be used for automobile and other vehicles as green energy resource.At present commercially available lithium ion battery is mainly by the carbon-based cathode material, and liquid organic electrolyte is formed with the transition metal oxide anode material that contains lithium.In order further to improve the performance of lithium ion battery, people study, seek than the better novel cathode material of carbon-based cathode material property.In addition, along with the miniaturization of microelectronic component, the lithium ion battery that an urgent demand exploitation is complementary therewith, for example film lithium ion battery etc.
Summary of the invention
The objective of the invention is to propose well behaved cathode material for lithium ion battery of a class and preparation method thereof.
The cathode material for lithium ion battery that the present invention proposes is a kind of nickel phosphide (Ni with rhombohedral structure
2P) material.Show that after deliberation this type of material has good electrochemical, can be used as the cathode material of high performance lithium ion battery.There is not nickel phosphide (Ni so far about filming
2P) as the report of cathode material for lithium ion battery.The nickel phosphide (Ni that the present invention proposes as cathode material for lithium ion battery
2P) be form of film, the thickness of its thin-film material is 0.2-1 μ m.
The invention allows for the preparation method of aforementioned cathode material for lithium ion battery, specifically be described below:
Nickel phosphide (Ni as cathode material for lithium ion battery
2P) film can adopt reactive pulsed laser deposition preparation, concrete steps are: compressing tablet after phosphorus powder and the nickel powder ground and mixed is made the used target of pulsed laser deposition, wherein the amount of substance of phosphorus powder be nickel powder 1-2 doubly, the 1064nm fundamental frequency that is produced by neodymium-doped yttrium pyralspite laser obtains the 355nm pulse laser behind frequency tripling, laser beam is through inciding after the lens focus on the above-mentioned target, the distance of target and substrate is 25-50mm, and deposition obtains nickel phosphide (Ni on substrate in argon gas atmosphere
2P) film, substrate can adopt stainless steel substrates, platinized platinum and gold-plated monocrystalline silicon piece, and substrate temperature is 300-600 ℃.The depositing of thin film time is required to determine by film thickness, was generally 0.2-1.0 hour.Film thickness can be measured by ESEM, and the weight of film is made difference according to substrate weight before and after the electronic balance weighing experiment and obtained.
Among the present invention, nickel phosphide (Ni
2P) crystal structure of film is determined by x-ray diffractometer (Bruker D8 Advance).X-ray diffracting spectrum shows the nickel phosphide (Ni that is made by pulse laser reactive deposition method
2P) film is the rhombohedral structure of polycrystalline.Measure by ESEM (Philips XL30) and to show, the nickel phosphide (Ni that makes by pulse laser reactive deposition method
2P) film surface is smooth and with some tiny reunions.
Among the present invention, nickel phosphide (Ni
2P) film can directly be made the lithium ion cell film electrode.
Among the present invention, nickel phosphide (Ni
2P) electrochemical property test of membrane electrode adopts the battery system of being made up of three electrodes, wherein, and nickel phosphide (Ni
2P) film is as work electrode, and the high purity lithium sheet is used separately as to electrode and reference electrode.Electrolyte is 1M LiPF
6+ EC+DMC (V/V=1/1).Battery is assemblied in the drying box of applying argon gas and carries out.The experiment that discharges and recharges of battery is carried out on blue electricity (Land) battery test system.
Among the present invention, the nickel phosphide (Ni that on substrates such as stainless steel substrates, makes by the pulse laser reactive deposition processes
2P) membrane electrode all has charge-discharge performance, and discharge capacity is 730400mAh/g for the first time.In discharge process thereafter, capacity is decayed to some extent.At voltage range 0-3V and current density 5 μ A/cm
2The time, nickel phosphide (Ni
2P) specific capacity of membrane electrode remains on 400mAh/g in preceding 30 circulations.
Above-mentioned performance shows, nickel phosphide (Ni
2P) be the novel cathode material of a class, can be applicable to lithium ion battery.
Description of drawings
Fig. 1 is nickel phosphide (Ni
2P) XRD spectra of film, the diffraction maximum of stainless steel substrate represented in asterisk among the figure, in the bracket is the crystal face indexes of diffraction maximum.
Embodiment
Adopt reactive pulsed laser deposition to prepare nickel phosphide (Ni
2P) film, color are black.During preparation, in the hybrid target, the amount of substance of phosphorus powder is 2 times of nickel powder, adopt stainless steel substrates as substrate, the distance of substrate and target is 40mm, substrate temperature is 400 ℃, and the fundamental frequency that is produced by the Nd:YAG laser produces the 355nm pulse laser through frequency tripling, on the hybrid target of laser beam through inciding antimony powder and selenium powder after the lens focus.Energy density is 2Jcm
-2, sedimentation time is 0.5 hour.
X-ray diffraction is measured and is shown that the film of deposition is the nickel phosphide (Ni of polycrystalline rhombohedral structure
2P) (accompanying drawing 1).Show the nickel phosphide (Ni that makes by the pulse laser reactive deposition by stereoscan photograph mensuration
2P) film surface is smooth and with some tiny reunions.
To the nickel phosphide (Ni on the stainless steel substrate
2P) the electrochemical property test result of membrane electrode is as follows:
Nickel phosphide (Ni2P) membrane electrode can be at 5 μ A/cm
2Carry out charge and discharge cycles under the charge-discharge velocity.In voltage range 0-3V, for the first time discharge capacity can reach 730mAh/g, circulates that capacity tends towards stability after 10 times, and 30 capacity that circulate remain on 400mAh/g.
Therefore, the nickel phosphide (Ni that on stainless steel substrates, deposits
2P) film can be used as the cathode material of lithium ion battery.
Claims (2)
1. cathode material for lithium ion battery is characterized in that the nickel phosphide film that has rhombohedral structure for a kind of, and the thickness of film is 0.2-1 μ m; And prepare: compressing tablet after phosphorus powder and the nickel powder ground and mixed is made the used target of pulsed laser deposition by following step, wherein the amount of substance of phosphorus powder be nickel powder 1-2 doubly, the 1064nm fundamental frequency that is produced by neodymium-doped yttrium pyralspite laser obtains the 355nm pulse laser behind frequency tripling, laser beam is through inciding after the lens focus on the above-mentioned target, the distance of target and substrate is 25-50mm, deposition obtains the nickel phosphide film on substrate in argon gas atmosphere, substrate adopts stainless steel substrates, platinized platinum or gold-plated monocrystalline silicon piece, and substrate temperature is 300-600 ℃.
2. the preparation method of the cathode material of a lithium ion battery as claimed in claim 1, it is characterized in that the nickel phosphide thin-film material adopts reactive pulsed laser deposition preparation, concrete steps are: compressing tablet after phosphorus powder and the nickel powder ground and mixed is made the used target of pulsed laser deposition, wherein the amount of substance of phosphorus powder be nickel powder 1-2 doubly, the 1064nm fundamental frequency that is produced by neodymium-doped yttrium pyralspite laser obtains the 355nm pulse laser behind frequency tripling, laser beam is through inciding after the lens focus on the above-mentioned target, the distance of target and substrate is 25-50mm, deposition obtains the nickel phosphide film on substrate in argon gas atmosphere, substrate adopts stainless steel substrates, platinized platinum or gold-plated monocrystalline silicon piece, substrate temperature are 300-600 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100396018A CN101304089B (en) | 2008-06-26 | 2008-06-26 | Phosphorizing nickel cathode material for lithium ion battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100396018A CN101304089B (en) | 2008-06-26 | 2008-06-26 | Phosphorizing nickel cathode material for lithium ion battery and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101304089A CN101304089A (en) | 2008-11-12 |
| CN101304089B true CN101304089B (en) | 2011-06-22 |
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| CN2008100396018A Expired - Fee Related CN101304089B (en) | 2008-06-26 | 2008-06-26 | Phosphorizing nickel cathode material for lithium ion battery and preparation method thereof |
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| CN (1) | CN101304089B (en) |
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2008
- 2008-06-26 CN CN2008100396018A patent/CN101304089B/en not_active Expired - Fee Related
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