CN106374089A - Lithium iron phosphate-lithium vanadium phosphate nano composite electrode material and preparation method therefor - Google Patents
Lithium iron phosphate-lithium vanadium phosphate nano composite electrode material and preparation method therefor Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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Abstract
The invention provides a lithium iron phosphate-lithium vanadium phosphate nano composite electrode material and a preparation method therefor. The preparation method comprises the steps of dissolving a water soluble lithium salt, a water soluble vanadium salt and a water soluble phosphorus source into deionized water separately to prepare into a lithium vanadium phosphate raw material solution; then adding lithium iron phosphate nanoparticles to be mixed with an organic solvent; next, adding an emulsifier to perform emulsification; then, performing a microwave reaction and drying to obtain a precursor; and next performing sintering by a resistance furnace to obtain the lithium iron phosphate-lithium vanadium phosphate nano composite electrode material. By adoption of the method provided by the invention, the technical problem of instability of the lithium iron phosphate-lithium vanadium phosphate caused by uneven shell layer ingredients and uneven shell layer thickness in the prior art is overcome; the prepared composite material is excellent in electrochemical property, extremely high in reversible capacity, and high in cycling stability; in addition, volume expansion of a battery structure can be buffered, and the prepared process is clean and environment-friendly; and the raw materials and the equipment are low in cost, so that the nano composite electrode material is suitable for large-scale industrial production.
Description
Technical field
The present invention relates to being a kind of lithium ion battery electrode material preparation field and in particular to a kind of LiFePO4-phosphoric acid
Vanadium lithium nanometer combined electrode material and preparation method thereof.
Background technology
The main composition material of lithium ion battery includes electrolyte, isolated material, positive and negative pole material etc., wherein positive electrode
Quality occupy larger proportion (mass ratio of positive and negative pole material be 3-4:1).Because the performance of positive electrode directly affects lithium
The performance of ion battery, its cost also directly determines battery cost height, so anode material for lithium-ion batteries becomes research
Popular.
The LiFePO4 of olivine-type structure has been reported from 1997 since having reversible removal lithium embedded characteristic, with its safety
Can good, cycle performance is excellent, environmental friendliness, abundant raw material source, low cost and other advantages and to become lithium ion battery main just
Pole material.However, when LiFePO4 is as anode material of lithium battery, however it remains defect, it is mainly manifested in the electricity of LiFePO4
Electronic conduction poor performance, chargeable voltage are relatively low, low-temperature stability is poor, tap density is little, stored by unit volume battery
Electric energy less, fe in building-up process2+Oxidizable one-tenth fe3+, it is difficult to obtain single-phase LiFePO4, purity is low, preparation technology
Complexity, and need long-time high-temperature calcination, high energy consumption, cycle are long.
But phosphoric acid vanadium lithium has higher voltage platform, and it is a kind of fast-ionic conductor, its can deintercalation lithium from
Sub is more, thus its electric conductivity is better than LiFePO4.But, in phosphoric acid vanadium lithium, the deintercalation of the 3rd lithium is difficult, and
And its cost is higher, limit its large-scale application.In order to make up the defect of LiFePO4 and phosphoric acid vanadium lithium, technical staff attempts
Being improved by the two compound means, obtaining the more preferable positive electrode of performance, thus solving both weakness.
Before Chinese invention patent application number 201410104093.2 discloses a kind of LiFePO4-phosphoric acid vanadium lithium composite
Drive the preparation method of body, mainly ferrum sulfuricum oxydatum solutum and sodium vanadate solution are added in stirred autoclave, control stirring speed
Spend for 50～400rpm, adjusting ph with ammonia is 2～8, after reaction, add polyaniline, stirring, ageing, filter, washing, it is dried,
?.However, not having not special nucleocapsid structure in this invention between LiFePO4 and phosphoric acid vanadium lithium, lithium ion between the two
Transmission, still based on point-to-point transmission, leads to performance boost amplitude inconspicuous.
It is multiple that Chinese invention patent application number 201110219480.7 discloses a kind of lithium iron phosphate/lithium vanadium phosphate of carbon coating
The preparation method of condensation material, iron phosphate, vanadic anhydride and lithium salt compound are mixed by this invention, add chelating agen, are ground
Mill mixing, adds carbon source material after heat treatment under an inert atmosphere, through heat temperature raising roasting, is then cooled to room temperature, obtains final product
Lithium iron phosphate/lithium vanadium phosphate composite material to carbon coated.However, this scheme of the invention uses carbon by LiFePO4 and phosphoric acid vanadium lithium
Cladding, lithium ion exchanges between LiFePO4 and phosphoric acid vanadium lithium, embedding, the de- still difficulty of phosphoric acid vanadium lithium, therefore, battery performance
Relatively low.
Chinese invention patent application number 201110160960.0 discloses a kind of phosphate-based anode composite of lithium ion battery
Material and preparation method, prepare phosphoric acid vanadium lithium precursor sol using sol-gal process, add iron phosphate powder and disperse all
Even, it is spray-dried and calcines in inert atmosphere, cooling is finely ground, obtain the LiFePO4 kernel of phosphoric acid vanadium lithium cladding, by two
Secondary spray drying, then calcine in an inert atmosphere, cooling obtains final product.This scheme of the invention prepares phosphoric acid vanadium lithium bag by sol-gal process
The lithium iron phosphate particles wrapped up in, the complexant that carbon containing is used, as additive, due to being difficult to accurately control the viscosity of colloid, leads to phosphorus
Sour vanadium lithium parcel is uneven, thus reducing technology stability.
According to above-mentioned, the synthesis technique of current LiFePO4-phosphoric acid vanadium lithium composite is directly mixed with raw material mostly, this
Based on a contact, the transmission of lithium ion is unstable between the two for contact between sample LiFePO4-phosphoric acid vanadium lithium, and impact is final
Battery performance.Or, LiFePO4-phosphoric acid vanadium lithium recombination process adopts using the reactant of solid-state as core, first allows complex salt
Uniformly wrap up, form nucleocapsid structure, then pass through calcine technology, fabricated in situ LiFePO4-lithium vanadium phosphate material.Though the method
Before so solving the problems, such as, but the local part being likely to result in due to the parcel of salt is uneven, still results in system below
Standby shell quality is low.
Content of the invention
In synthesis technique for current nucleocapsid structure LiFePO4-phosphoric acid vanadium lithium composite, stirred using simple complexation
The method mixed, the shell uneven components of preparation, shell thickness heterogeneity, and then the final LiFePO4-phosphoric acid vanadium lithium leading to
The technical problem of unstable properties, the present invention provides a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material and its preparation
Method, overcomes the shell uneven components of preparation in prior art, shell thickness heterogeneity, and then the final iron phosphate leading to
The technical problem of lithium-phosphoric acid vanadium lithium unstable properties, the electrochemical performance of the composite of acquisition, wherein phosphoric acid vanadium lithium
Shell structurre shortens li+Embedding de- passage, there is high reversible capacity and good cyclical stability, and electricity can be buffered
The volumetric expansion of pool structure, production process cleans, environmental protection, simple to operate, and raw material and equipment cost are cheap, suitable large-scale industry
Metaplasia is produced.
For solving the above problems, the present invention employs the following technical solutions:
(1) water solublity lithium salts, vanadic salts and phosphorus source are in molar ratio (2-4): 1:1 weighs, then three are dissolved in deionized water
In, it is configured to phosphoric acid vanadium lithium material liquid, wherein lithium salt is 1-1.5mol/l；
(2) add lithium iron phosphate nano particle and organic solvent in described phosphoric acid vanadium lithium material liquid, stir while adding, its
In, the mass ratio of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent is 1:(0.3-1.3): (0.01-
0.2), obtain mixing turbid liquid, then to Deca emulsifying agent, described emulsifying agent and described lithium iron phosphate nano grain in the turbid liquid of described mixing
The mass ratio of son is 1:(0.5-1), keep being stirred continuously 1-2h, obtain the turbid liquid of LiFePO4-phosphoric acid vanadium lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, after being dried, obtain LiFePO4-phosphoric acid vanadium lithium core
Shell structure presoma；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, obtain LiFePO4-vanadium phosphate
Lithium nanometer combined electrode material.
Preferably, described soluble lithium salt adopt Lithium hydrate, Quilonorm (SKB), lithium sulfate and lithium nitrate therein any one or
Two or more combinations；
Described vanadic salts crosses vanadyl for oxalic acid, ammonium vanadate, acetic acid vanadium, triethanolamine cross arbitrary in one of vanadyl, Sulfovanadic acid
Plant or two or more combinations；
Phosphorus source adopts the combination of any one or more in phosphoric acid, ammonium dihydrogen phosphate, diammonium phosphate and ammonium phosphate.
Preferably, described emulsifying agent is fatty glyceride, methyl glycol fatty acid ester, dodecyl sodium sulfate, dodecane
The combination of any one or more of base benzene sulfonic acid sodium salt；
Described organic solvent be benzene,toluene,xylene, hexamethylene, Ketohexamethylene, toluene Ketohexamethylene, pentane, hexane, octane appoint
One or more combination.
Preferably, the particle size of described lithium iron phosphate nano particle is 10-50nm.
Preferably, described microwave treatment is specially and arranges microwave power is 1000-1500w, and process time is 1-8h, environment
Temperature is 80-100 DEG C.
Preferably, described calcination processing is specially precalcining 0.5-1h at 230-300 DEG C, and then rising high-temperature is 600-
660 DEG C, programming rate is 10-30 DEG C/h, and calcination time is 1-2h.
The present invention provides a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material, described LiFePO4-phosphoric acid vanadium lithium
The electrode material with core-shell structure that nanometer combined electrode material is prepared from by said method.
The present invention is first dissolved in water miscible lithium salts, vanadic salts, phosphorus source in deionized water respectively, is configured to phosphoric acid vanadium lithium raw material
Liquid, is subsequently adding lithium iron phosphate nano particle, is mixed with organic solvent, then adds emulsifying agent and carry out emulsifying, stirs, enters one
Step passes through microwave reaction, obtains presoma after being dried, then it is multiple to fire formation kind LiFePO4-phosphoric acid vanadium lithium nanometer through resistance furnace
Composite electrode material, keeps the nucleocapsid structure of LiFePO4-phosphoric acid vanadium lithium, simultaneously by the way of microwave, quickly forms pre- nucleocapsid
Structure particles, by the composition dimensional homogeneity of the powder after being relatively beneficial to calcine, and are easily achieved large-scale industry metaplasia
Produce, technological process will be greatly simplified, raw materials for production cost reduces, safe, clean environment firendly.
A kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material prepared by the present invention and sol-gal process processability
Test as shown in table 1.
Table 1:
| Performance indications | Internal resistance (m ω) | 30 DEG C of specific capacities (mah/g) |
| The present invention | 10 | 288 |
| Sol-gal process | 13 | 180 |
The present invention provides a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material and preparation method thereof, with prior art phase
It is than, its prominent feature and excellent effect:
1st, the present invention first adopts the uniform raw slurry of emulsifying process prepared composition, then adopts microwave method to obtain granule uniform
Presoma, then fire formation kind of a LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material through resistance furnace, phosphoric acid can be kept
The nucleocapsid structure of ferrum lithium-phosphoric acid vanadium lithium, simultaneously by the way of microwave, quickly forms pre- core-shell structure particles, is beneficial to calcine
The homogeneity of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material shell composition and shell thickness afterwards.
2nd, the shell structurre of the phosphoric acid vanadium lithium of present invention preparation, uniformly wraps up lithium iron phosphate particles, shortens li+Embedding de-
Passage, has high reversible capacity and good cyclical stability, and the volumetric expansion of energy buffer battery structure.
3rd, the preparation process cleaning of the present invention, environmental protection, needed raw material is all large industrial chemicals, with low cost, technique road
Line is simple, and preparation speed is fast, easily realizes industrial-scale production, has boundless application prospect.
Specific embodiment
Below by way of specific embodiment, the present invention is described in further detail, but this should not be interpreted as the present invention
Scope be only limitted to Examples below.In the case of without departing from said method thought of the present invention, according to ordinary skill
Various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
(1) Lithium hydrate, ammonium vanadate and phosphoric acid are weighed for 2:1:1 in molar ratio, then three is dissolved in deionized water, joins
It is set to phosphoric acid vanadium lithium material liquid, wherein Lithium hydrate concentration is 1mol/l；
(2) the lithium iron phosphate nano particle that particle size is 10nm and organic solvent are added in described phosphoric acid vanadium lithium material liquid
Benzene, stirs while adding, and wherein, the mass ratio of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent is
1:0.3:0.01, obtains mixing turbid liquid, then to described mixing turbid liquid in Deca fatty glyceride, fatty glyceride with described
The mass ratio of lithium iron phosphate nano particle is 1:0.5, keeps being stirred continuously 1h, obtains the turbid liquid of LiFePO4-phosphoric acid vanadium lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, setting microwave power is 1500w, and process time is
1h, ambient temperature is 80 DEG C, obtains LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma after being dried；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, precalcining 0.5h at 230 DEG C,
Then rise high-temperature to 600 DEG C, programming rate is 10 DEG C/h, calcination time is 1h, obtains LiFePO4-phosphoric acid vanadium lithium nanometer multiple
Composite electrode material.
The LiFePO4 prepared according to step in embodiment 1-phosphoric acid vanadium lithium nanometer combined electrode material is carried out performance
Test, the performance parameter of acquisition is as shown in table 2.
Embodiment 2
(1) Quilonorm (SKB), acetic acid vanadium and diammonium phosphate are weighed for 2.5:1:1 in molar ratio, then three is dissolved in deionization
In water, it is configured to phosphoric acid vanadium lithium material liquid, wherein lithium acetate solution concentration is 1.2mol/l；
(2) the lithium iron phosphate nano particle that particle size is 15nm and organic solvent two are added in described phosphoric acid vanadium lithium material liquid
Toluene, stirs while adding, wherein, the mass ratio of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent
For 1:0.5:0.02, obtain mixing turbid liquid, then to Deca methyl glycol fatty acid ester in the turbid liquid of described mixing, methyl glycol fatty acid ester
Mass ratio with described lithium iron phosphate nano particle is 1:0.6, keeps being stirred continuously 1.2h, obtains LiFePO4-phosphoric acid vanadium lithium
Turbid liquid；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, setting microwave power is 1200w, and process time is
2h, ambient temperature is 85 DEG C, obtains LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma after being dried；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, precalcining 0.6h at 250 DEG C,
Then rise high-temperature to 620 DEG C, programming rate is 15 DEG C/h, calcination time is 1h, obtains LiFePO4-phosphoric acid vanadium lithium nanometer multiple
Composite electrode material.
The LiFePO4 prepared according to step in embodiment 2-phosphoric acid vanadium lithium nanometer combined electrode material is carried out performance
Test, the performance parameter of acquisition is as shown in table 2.
Embodiment 3
(1) mixture of Lithium hydrate and lithium sulfate, ammonium vanadate and phosphoric acid are weighed for 2:1:1 in molar ratio, then by three
It is dissolved in deionized water, the mixture concentration being configured to phosphoric acid vanadium lithium material liquid, wherein Lithium hydrate and lithium sulfate is 1.3mol/
l；
(2) the lithium iron phosphate nano particle that particle size is 25nm and organic solvent ring are added in described phosphoric acid vanadium lithium material liquid
Hexane, stirs while adding, wherein, described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent hexamethylene
Mass ratio is 1:0.5:0.1, obtains mixing turbid liquid, then to Deca fatty glyceride in the turbid liquid of described mixing, fatty acid glycerine
Ester is 1:0.7 with the mass ratio of described lithium iron phosphate nano particle, keeps being stirred continuously 1.5h, obtains LiFePO4-vanadium phosphate
The turbid liquid of lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, setting microwave power is 1300w, and process time is
4h, ambient temperature is 80 DEG C, obtains LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma after being dried；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, precalcining 0.5h at 250 DEG C,
Then rise high-temperature to 630 DEG C, programming rate is 19 DEG C/h, calcination time is 1.5h, obtains LiFePO4-phosphoric acid vanadium lithium nanometer
Combination electrode material.
The LiFePO4 prepared according to step in embodiment 3-phosphoric acid vanadium lithium nanometer combined electrode material is carried out performance
Test, the performance parameter of acquisition is as shown in table 2.
Embodiment 4
(1) lithium sulfate and lithium nitrate mixture, ammonium vanadate and ammonium dihydrogen phosphate are weighed for 2.2:1:1 in molar ratio, then will
Three is dissolved in deionized water, is configured to phosphoric acid vanadium lithium material liquid, wherein Lithium hydrate concentration is 1.3mol/l；
(2) the lithium iron phosphate nano particle that particle size is 40nm and organic solvent penta are added in described phosphoric acid vanadium lithium material liquid
Alkane, hexane, stir while adding, wherein, the quality of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent
Ratio for 1:0.8:0.2, obtains mixing turbid liquid, then to Deca dodecylbenzene sodium sulfonate in the turbid liquid of described mixing, detergent alkylate
Sodium sulfonate is 1:0.8 with the mass ratio of described lithium iron phosphate nano particle, keeps being stirred continuously 1.5h, obtains LiFePO4-phosphorus
The turbid liquid of sour vanadium lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, setting microwave power is 1400w, and process time is
6h, ambient temperature is 90 DEG C, obtains LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma after being dried；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, precalcining 1h at 280 DEG C, so
Rise high-temperature afterwards to 660 DEG C, programming rate is 30 DEG C/h, calcination time is 1h, obtains LiFePO4-phosphoric acid vanadium lithium nano combined
Electrode material.
The LiFePO4 prepared according to step in embodiment 4-phosphoric acid vanadium lithium nanometer combined electrode material is carried out performance
Test, the performance parameter of acquisition is as shown in table 2.
Embodiment 5
(1) Lithium hydrate, ammonium vanadate and phosphoric acid are weighed for 4:1:1 in molar ratio, then three is dissolved in deionized water, joins
It is set to phosphoric acid vanadium lithium material liquid, wherein Lithium hydrate concentration is 1.5mol/l；
(2) the lithium iron phosphate nano particle that particle size is 10nm and organic solvent are added in described phosphoric acid vanadium lithium material liquid
Benzene, stirs while adding, and wherein, the mass ratio of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent is
1:1.3:0.2, obtains mixing turbid liquid, then to described mixing turbid liquid in Deca fatty glyceride, fatty glyceride with described
The mass ratio of lithium iron phosphate nano particle is 1:1, keeps being stirred continuously 2h, obtains the turbid liquid of LiFePO4-phosphoric acid vanadium lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, setting microwave power is 1000w, and process time is
8h, ambient temperature is 100 DEG C, obtains LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma after being dried；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, precalcining 1h at 300 DEG C, so
Rise high-temperature afterwards to 660 DEG C, programming rate is 30 DEG C/h, calcination time is 2h, obtains LiFePO4-phosphoric acid vanadium lithium nano combined
Electrode material.
The LiFePO4 prepared according to step in embodiment 5-phosphoric acid vanadium lithium nanometer combined electrode material is carried out performance
Test, the performance parameter of acquisition is as shown in table 2.
Table 2:
| Performance indications | Internal resistance (m ω) | 30 DEG C of specific capacities (mah/g) |
| Embodiment 1 | 10 | 255 |
| Embodiment 2 | 10 | 261 |
| Embodiment 3 | 10 | 288 |
| Embodiment 4 | 10 | 277 |
| Embodiment 5 | 10 | 257 |
Claims (7)
1. a kind of preparation method of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material is it is characterised in that methods described adopts
Water miscible lithium salts, vanadic salts and phosphorus source, as synthesis material, comprise the following steps:
(1) water solublity lithium salts, vanadic salts and phosphorus source are in molar ratio (2-4): 1:1 weighs, then three are dissolved in deionized water
In, it is configured to phosphoric acid vanadium lithium material liquid, wherein lithium salt is 1-1.5mol/l；
(2) add lithium iron phosphate nano particle and organic solvent in described phosphoric acid vanadium lithium material liquid, stir while adding, its
In, the mass ratio of described phosphoric acid vanadium lithium material liquid, lithium iron phosphate nano particle and organic solvent is 1:(0.3-1.3): (0.01-
0.2), obtain mixing turbid liquid, then to Deca emulsifying agent, described emulsifying agent and described lithium iron phosphate nano grain in the turbid liquid of described mixing
The mass ratio of son is 1:(0.5-1), keep being stirred continuously 1-2h, obtain the turbid liquid of LiFePO4-phosphoric acid vanadium lithium；
(3) by turbid for described LiFePO4-phosphoric acid vanadium lithium liquid through microwave treatment, after being dried, obtain LiFePO4-phosphoric acid vanadium lithium core
Shell structure presoma；
(4) by described LiFePO4-phosphoric acid vanadium lithium nucleocapsid structure presoma through calcination processing, obtain LiFePO4-vanadium phosphate
Lithium nanometer combined electrode material.
2. the preparation method of a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material according to claim 1, it is special
Levy and be, described soluble lithium salt adopt Lithium hydrate, Quilonorm (SKB), lithium sulfate and lithium nitrate therein any one or more
Combination；
Described vanadic salts crosses vanadyl for oxalic acid, ammonium vanadate, acetic acid vanadium, triethanolamine cross arbitrary in one of vanadyl, Sulfovanadic acid
Plant or two or more combinations；
Phosphorus source adopts the combination of any one or more in phosphoric acid, ammonium dihydrogen phosphate, diammonium phosphate and ammonium phosphate.
3. the preparation method of a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material according to claim 1, it is special
Levy and be, described emulsifying agent is fatty glyceride, methyl glycol fatty acid ester, dodecyl sodium sulfate, DBSA
The combination of any one or more of sodium；
Described organic solvent be benzene,toluene,xylene, hexamethylene, Ketohexamethylene, toluene Ketohexamethylene, pentane, hexane, octane appoint
One or more combination.
4. the preparation method of a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material according to claim 1, it is special
Levy and be, the particle size of described lithium iron phosphate nano particle is 10-50nm.
5. the preparation method of a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material according to claim 1, it is special
Levy and be, described microwave treatment is specially and arranges microwave power is 1000-1500w, and process time is 1-8h, and ambient temperature is
80-100℃.
6. the preparation method of a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material according to claim 1, it is special
Levy and be, described calcination processing is specially precalcining 0.5-1h at 230-300 DEG C, then rise high-temperature and be 600-660 DEG C, rise
Warm speed is 10-30 DEG C/h, and calcination time is 1-2h.
7. a kind of LiFePO4-phosphoric acid vanadium lithium nanometer combined electrode material is it is characterised in that described LiFePO4-phosphoric acid vanadium lithium
What method described in any one of claim 1-6 for the nanometer combined electrode material was prepared from has the electrode material of core-shell structure
Material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946566A (en) * | 2017-11-16 | 2018-04-20 | 贝特瑞（天津）纳米材料制造有限公司 | A kind of compound LiFePO4‑LiMPO4Positive electrode and preparation method thereof |
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