CN104124453B - Lithium iron manganese phosphate composite positive electrode material and preparation method, positive electrode and lithium battery - Google Patents
Lithium iron manganese phosphate composite positive electrode material and preparation method, positive electrode and lithium battery Download PDFInfo
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- CN104124453B CN104124453B CN201410361560.XA CN201410361560A CN104124453B CN 104124453 B CN104124453 B CN 104124453B CN 201410361560 A CN201410361560 A CN 201410361560A CN 104124453 B CN104124453 B CN 104124453B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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Abstract
The invention discloses a lithium iron manganese phosphate composite positive electrode material and a preparation method thereof, a lithium battery positive electrode and a lithium battery. The size of the lithium iron manganese phosphate composite positive electrode material is nano-scale, graphdiyne is compounded in a lithium iron manganese phosphate base material, and the mass of the graphdiyne is 0.1-10% that of the lithium iron manganese phosphate base material. The preparation method comprises the steps of dissolving nano-scale lithium source, manganese source, iron source and phosphorus source in a solvent according to the molar ratio of the elements of lithium iron manganese phosphate to form a solution, sequentially adding a complexing agent and a graphdiyne solution into the solution, then drying, grinding, sintering and annealing. Both the lithium battery positive electrode and the lithium battery contain the lithium iron manganese phosphate composite positive electrode material. According to the lithium iron manganese phosphate composite positive electrode material, the migration paths of Li＜+＞ and electrons are shortened by reducing the primary particle size, so that the electric conductivity of the material is improved. According to the preparation method, the performance stability of the lithium iron manganese phosphate composite positive electrode material can be ensured. The discharge gram volume and circulating volume retention rate of the lithium battery is high.
Description
Technical field
The invention belongs to cell art, and in particular to a kind of iron manganese phosphate for lithium composite positive pole and its preparation side
Method, lithium battery anode and lithium battery.
Background technology
In the last few years, anode material for lithium-ion batteries LiFePO4Because having raw material sources extensively, low price, heat is steady
Qualitative excellent, good cycle receives much concern the advantages of safety non-toxic, it is considered to be preferable a new generation's lithium ion cell positive material
Material, but LiFePO4Relatively low discharge voltage plateau (about 3.4V) can metric density lower limit its development and application.
With LiFePO4With mutually isostructural LiMnPO4Relative to Li+The electrode potential of/Li is 4.1V, is far above
LiFePO4Voltage platform, and in the electrochemical stability window of existing electrolyte system, following application prospect extensively, because
This receives much concern.However, due to LiMnPO4Electric conductivity extreme difference, it is considered to be insulator, cause the synthesis being capable of reversible discharge and recharge
LiMnPO4It is extremely difficult, limit its development and application.
Iron manganese phosphate for lithium LiMnxFe1-xPO4(0<x<1) it is in LiMnPO4Grow up on the basis of modified, although Fe2+
Introducing the electric conductivity of lithium manganese phosphate can be made to increase, but improve limited extent, it is difficult to make the chemical property of material
Give full play of.Therefore, the electric conductivity for how further improving the iron manganese phosphate for lithium is inquired into and have studied to emphasis of the present invention.
The content of the invention
The above-mentioned deficiency for aiming to overcome that prior art of the embodiment of the present invention, there is provided a kind of iron manganese phosphate for lithium is compound just
Pole material and preparation method thereof, it is not high to solve existing lithium iron manganese phosphate anode material electric conductivity, prepare lithium-ion electric tank discharge
Capacity is low, circulates the technical problem of conservation rate difference.
The another object of the embodiment of the present invention is to provide a kind of electricity of the lithium containing the iron manganese phosphate for lithium composite positive pole
Pond positive pole and lithium battery.
In order to realize foregoing invention purpose, technical scheme is as follows：
A kind of iron manganese phosphate for lithium composite positive pole, the iron manganese phosphate for lithium composite positive pole size is nanoscale, and
Graphite alkene is compounded with iron manganese phosphate for lithium base material, the quality of the graphite alkene is the 0.1- of the iron manganese phosphate for lithium substrate mass
10%.
And, a kind of preparation method of iron manganese phosphate for lithium composite positive pole comprises the steps：
Mol ratio according to each element of iron manganese phosphate for lithium adds nano level lithium source, manganese source, source of iron, phosphorus source in solvent
Dissolution process is carried out, clear solution A is obtained；
Chelating agent is added in the clear solution A, and carries out mixed processing, obtain mixed liquid B；
Graphite alkene solution is added in the mixed liquid B, and carries out mixed processing, obtain mixed liquor C；Wherein, the stone
The amount that black alkynes solution is added is the theoretical 0.1-10% for generating iron manganese phosphate for lithium quality；
Mixed liquor C is dried, iron manganese phosphate for lithium composite positive pole presoma is obtained；
The iron manganese phosphate for lithium composite positive pole presoma is ground into process, Jing 50-300 mesh sieves after protection
Heat treatment in property atmosphere, at 500-900 DEG C, is then made annealing treatment.
And, a kind of lithium battery anode, including the positive electrode of collector and combination on the collector, the positive pole
Material is above-mentioned iron manganese phosphate for lithium composite positive pole or the preparation method by above-mentioned iron manganese phosphate for lithium composite positive pole
The iron manganese phosphate for lithium composite positive pole of preparation.
And, a kind of lithium battery, the lithium battery includes above-mentioned lithium battery anode.
Compared with prior art, above-mentioned iron manganese phosphate for lithium composite positive pole granule is nanoscale, from diminution primary particle size
Aspect shortens Li+With the migration path of electronics, so as to improve the electric conductivity of material, the chemical property of material is improved.Using
Graphite alkene complex technique, improves the inner conductive of iron manganese phosphate lithium material, effectively reduces the volume of iron manganese phosphate lithium material
Resistivity, improves the internal electron electric conductivity and lithium ion transport speed of material, and is not result in the voltage of iron manganese phosphate for lithium
Platform is reduced.
The preparation method of above-mentioned iron manganese phosphate for lithium composite positive pole adopts chelating agent complexation of metal ions so as in atom
Horizontal homogeneous disperse, and obtain nanometer materials by chemical method.The method causes graphite alkene and iron manganese phosphate for lithium to reach point
Sub- rank it is dispersed, realize that graphite alkene is compound to iron manganese phosphate for lithium material structure inside, compared to the carbon bag of particle surface
Cover, the electric conductivity of iron manganese phosphate for lithium is obviously improved.In addition, by heat treatment within specified temperatures and annealing treatment
Reason so that graphite alkene is stablized with the composite structure that iron manganese phosphate for lithium is formed.
Above-mentioned lithium battery anode and lithium battery due to containing above-mentioned iron manganese phosphate for lithium composite positive pole, and due to the phosphoric acid
Ferromanganese lithium composite positive pole has electric conductivity excellent as mentioned above, therefore, lithium battery anode chemical property is good, so as to
Give the high electric discharge gram volume of the lithium battery and excellent circulation characteristic and high circulation volume conservation rate.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is embodiment of the present invention iron manganese phosphate for lithium composite positive pole preparation method schematic flow sheet；
Fig. 2 is the SEM figures of the iron manganese phosphate for lithium composite positive pole prepared with the embodiment of the present invention 1；
Fig. 3 is the TEM figures of the iron manganese phosphate for lithium composite positive pole prepared with the embodiment of the present invention 1；
Fig. 4 is the discharge and recharge of the lithium ion battery of the iron manganese phosphate for lithium composite positive pole prepared with the embodiment of the present invention 1
Curve chart；
Fig. 5 is 1C times of the lithium ion battery with the LiFePO4 composite conductor of the preparation of the embodiment of the present invention 1 as positive electrode
125 Posterior circle capability retention curve charts of rate discharge and recharge.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
Present example provides a kind of electric conductivity high iron manganese phosphate for lithium composite positive pole.The iron manganese phosphate for lithium is compound just
Pole scantling is to be compounded with graphite alkene in nanoscale, and iron manganese phosphate for lithium base material.
Specifically, the graphite alkene is monolayer carbon atom, is that phenyl ring conjugation connection is formed into two dimensional surface by the acetylene bonds of 1,3- bis-
The full carbon molecule of network structure, with abundant carbon chemical bond, big conjugated system, wide interplanar distance, excellent chemical stability
And semiconducting behavior.With special electronic structure, big specific surface and loose structure, superior electrical performance, research shows stone
The conductive capability of black alkynes is more higher than Graphene.In above-mentioned iron manganese phosphate for lithium composite positive pole, the graphite alkene is to iron manganese phosphate
Lithium material inside configuration Uniform Doped is combined, and the composite of rock-steady structure is formed, so as to effectively improve iron manganese phosphate lithium material
Inner conductive, effectively reduce the specific insulation of iron manganese phosphate lithium material.In one embodiment, it is multiple in iron manganese phosphate for lithium
In closing positive electrode, the quality of the graphite alkene is the 0.1-10% of iron manganese phosphate for lithium substrate mass.In a preferred embodiment, the stone
The quality of black alkynes is the 0.5%-5% of iron manganese phosphate for lithium substrate mass.By the content for adjusting graphite alkene, i.e., graphite is adjusted indirectly
Distribution of the alkynes inside iron manganese phosphate for lithium base material, can further improve its electric conductivity and improve the stability of material.
Above-mentioned iron manganese phosphate for lithium composite positive pole size Control is nanoscale, and Li is shortened in terms of primary particle size is reduced+
With the migration path of electronics, so as to improve the electric conductivity of material, the chemical property of material is improved.In order to further improve phosphorus
The electric conductivity of sour ferromanganese lithium composite positive pole, in one embodiment, the iron manganese phosphate for lithium composite positive pole size Control is
10-80nm。
Therefore, above-mentioned iron manganese phosphate for lithium composite positive pole is compound to iron manganese phosphate for lithium inside configuration using graphite alkene, shows
Work improves the electric conductivity of iron manganese phosphate for lithium, effectively reduces the specific insulation of iron manganese phosphate lithium material, improves material
Internal electron electric conductivity and lithium ion transport speed, and it is not result in that the voltage platform of iron manganese phosphate for lithium is reduced.Meanwhile, it is and existing
There is carbon coating structure to compare, the excellent stability of the iron manganese phosphate for lithium composite positive pole can effectively overcome carbon coating structure
Carbon coating layer peel off.In addition, above-mentioned iron manganese phosphate for lithium composite positive pole Grain size controlling is nanoscale, from diminution primary particle size
Aspect shortens Li+With the migration path of electronics, so as to improve the electric conductivity of material, the chemical property of material is improved.
Correspondingly, the embodiment of the present invention additionally provides a kind of preparation method of above-mentioned iron manganese phosphate for lithium composite positive pole,
The method technological process refers to Fig. 1.The iron manganese phosphate for lithium composite positive pole preparation method comprises the steps：
Step S01：Mol ratio according to each element of iron manganese phosphate for lithium adds nano level lithium source, manganese source, source of iron, phosphorus source
Enter and carry out in solvent dissolution process, obtain clear solution A；
Step S02：Chelating agent is added in the clear solution A prepared to step S01, and carries out mixed processing, obtained
Mixed liquid B；
Step S03：Graphite alkene solution is added in the mixed liquid B prepared to step S02, and carries out mixed processing, obtained
To mixed liquor C；
Step S04：Mixed liquor C prepared by step S03 is dried, iron manganese phosphate for lithium composite positive pole forerunner is obtained
Body；
Step S05：The iron manganese phosphate for lithium composite positive pole presoma prepared by step S04 is ground into process,
Jing 50-300 mesh sieves the heat treatment in the protective atmosphere, at 500-900 DEG C, is then made annealing treatment.
Specifically, in above-mentioned steps S01, the molecular formula of iron manganese phosphate for lithium can be expressed as LiMnxFe1-xPO4, wherein, 0<x
<1.Due to Fe2+Replace part Mn2+Ratio, although Fe2+Intervention, can increase cell parameter, improve the electric conductivity of material,
But add Fe2+Ratio it is excessive, voltage platform can be caused to reduce, and the maximum advantage of lithium manganese phosphate is to possess high voltage platform
(4.1V).Accordingly, in a preferred embodiment, the x is 0.8.
Nanometer lithium source, manganese source, source of iron in step S01, the acquisition side of phosphorus source can be by lithium source, manganese source, source of iron, phosphorus
Source adopts milled processed so that each raw material particle size reaches nanoscale.Wherein, milled processed can be adopted at ball milling or sand milling technique
Reason.In a particular embodiment, nanoscale is carried out to lithium source, manganese source, source of iron, phosphorus source and processes the step being referred in embodiment 1
S11 process.
Wherein, lithium source, manganese source, source of iron, phosphorus source are to prepare the conventional respective compound of iron manganese phosphate for lithium, transparent in order to prepare
Solution A, it should which selection can be dissolved in lithium source in solvent, manganese source, source of iron, phosphorus source.Therefore, in one embodiment, this is prepared saturating
The solvent of bright solution A is preferably deionized water, distilled water, ethanol, oxalic acid, methanol, acetone, dimethylformamide, dimethyl
One or more admixture solvent in sulfoxide, ethylene glycol.In another embodiment, lithium source can with but not only select
Lithium carbonate, manganese source can with but not only select manganese nitrate, source of iron can with but not only select ferric nitrate, phosphorus source can with but not only
From ammonium dihydrogen phosphate.
Above-mentioned nanoscale lithium source, manganese source, source of iron, phosphorus source are completely dissolved, clear solution is obtained.
Metal ion in the above-mentioned clear solution A of chelating agent energy complexation added in above-mentioned steps S02 so as in atom water
It is flat dispersed.In order to improve complexing power of the chelating agent to the metal ion in above-mentioned clear solution A, in one embodiment,
The chelating agent from ethylenediaminetetraacetic acid, organic carbonate, ethyl acetate, Ethyl formate, oxalic acid, alkene, alkynes, aromatic hydrocarbon,
At least one in ethylene.
In another embodiment, the amount that the chelating agent is added is the theoretical 10-50% for generating iron manganese phosphate for lithium quality.
In order that chelating agent gives full play to work, in the chelating agent to be added to above-mentioned clear solution A or afterwards,
Clear solution A is stirred, the time of stirring should be abundant, such as after chelating agent is added and finished, continues stir process
0.5-2 hours.
In above-mentioned steps S03, in order that graphite alkene is sufficiently mixed dispersion with above-mentioned mixed liquid B, in one embodiment, will
The graphite alkene solution is added in the mixed liquid B by the way of dropwise Deca.In further preferred embodiments, the graphite alkene
The mass concentration of solution is 20%-80%, and drops to the drop rate in the mixed liquid B for 1d/min-10d/min.
Wherein, the graphite alkene solution in step S03 can be prepared as follows：Using ultrasound by graphite alkene
In being dispersed to solvent, the solvent can with but not only select ethanol, other dispersed graphite alkynes and can not affect mixed liquid B system
Other solvents can be with, concrete such as Polyethylene Glycol, acetone, isopropanol.
In order to pass through to adjust the content of graphite alkene, regulation graphite alkene dividing inside iron manganese phosphate for lithium base material indirectly is realized
Cloth, improves its electric conductivity and improves the stability of material.In one embodiment, the amount that graphite alkene solution is added ensures graphite
Alkynes is the theoretical 0.1%-10%, preferably 0.5-10% for generating iron manganese phosphate for lithium quality.
In above-mentioned steps S04, the purpose that mixed liquor C is dried is, in order to remove solvent, in one embodiment, this to be mixed
Liquid C is closed at 100～500 DEG C, after heating 2～10 hours, solid is collected.Specifically, can carry out in an oven.
In above-mentioned steps S05, the specific environment of Jing heat treatment with a temperature of so that before iron manganese phosphate for lithium composite positive pole
Drive body and change original atom distribution in heat treatment process, and realize that atom is redistributed in annealing process, realize
Graphite alkene is compound to iron manganese phosphate for lithium material structure inside, improves the electric conductivity of iron manganese phosphate for lithium.In order to ensure graphite alkene to phosphorus
Sour ferromanganese lithium material inside configuration is full and uniform compound, and in one embodiment, the time of heat treatment is 2-24 at this 500-900 DEG C
Hour.In another preferred embodiment, in the heating process of the heat treatment, it is warming up to 1～15 DEG C/min of heating rate
500-900℃。
In addition, annealing conditions also have an impact to the chemical property and stability of iron manganese phosphate for lithium composite positive pole.For
Ensure excellent chemical property and stability of the graphite alkene to iron manganese phosphate lithium material.In one embodiment, the step
Annealing is cooled to room temperature such as in protective atmosphere using slow annealing process with the speed of 1-5 DEG C/min.
In the heat treatment and annealing process, the protective atmosphere refers to inert atmosphere or reducing atmosphere, certainly, such as
Fruit conditions permit, can also be vacuum environment.The protective atmosphere is avoiding iron manganese phosphate for lithium composite positive pole presoma in heat
It is oxidized in processing procedure.
The preparation method of above-mentioned iron manganese phosphate for lithium composite positive pole adopts chelating agent complexation of metal ions so as in atom
Horizontal homogeneous disperse, and obtain nanometer materials by chemical method.The method causes graphite alkene and iron manganese phosphate for lithium to reach point
Sub- rank it is dispersed, realize that graphite alkene is compound to iron manganese phosphate for lithium material structure inside, compared to the carbon bag of particle surface
Cover, the electric conductivity of iron manganese phosphate for lithium is obviously improved.In addition, by heat treatment within specified temperatures and annealing treatment
Reason so that graphite alkene is stablized with the composite structure that iron manganese phosphate for lithium is formed.
On the basis of based on above-mentioned iron manganese phosphate for lithium composite positive pole embodiment, the embodiment of the present invention additionally provides one kind
Lithium battery anode, it includes collector and combines the positive electrode on the collector.Wherein, the positive electrode is mentioned above
Iron manganese phosphate for lithium composite positive pole；Collector can select collector commonly used in the art.So, the lithium battery anode by
In containing iron manganese phosphate for lithium composite positive pole mentioned above, and because the iron manganese phosphate for lithium composite positive pole has as above
Described electric conductivity is excellent, stabilized structure, and chemical property is good.Therefore, lithium battery anode stable performance in the course of the work,
Electric conductivity is high, stabilized structure.
Correspondingly, on the basis of above-mentioned lithium battery anode embodiment, the embodiment of the present invention additionally provides a kind of lithium battery,
The lithium battery includes lithium battery anode mentioned above.So, the lithium battery is due to containing lithium battery anode mentioned above, from
And the high electric discharge gram volume of the lithium battery and excellent circulation characteristic and high circulation volume conservation rate characteristic are given, and the lithium
Battery stable electrochemical property during charge and discharge cycles, capacity is high, life-span length.Make it can permanent worker under conditions of high current
Make, therefore, it can for being generalizable on electric automobile.
Above-mentioned lithium battery iron manganese phosphate for lithium composite positive pole and its preparation are illustrated below by way of multiple embodiments
The aspects such as method, lithium battery anode and lithium battery.
Embodiment 1
A kind of iron manganese phosphate for lithium composite positive pole and preparation method thereof, its preparation method comprises the steps：
Step S11：By LITHIUM BATTERY raw material lithium carbonate, manganese nitrate, ferric nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, second
Acetoacetic ester is Li according to mol ratio Jing after sand mill processes 30min：Mn：Fe：P=1.1:0.8:0.2:1 carries out weighing (theory
Product is 1 mole), and be dissolved in successively in deionized water and oxalic acid, magnetic agitation to formation clear solution A；
Step S12：Weigh 10g ethylenediaminetetraacetic acid to add in solution A, magnetic agitation treats that solution colour fades to dark brown
When, 4g ethyl acetate is added, after magnetic agitation 1h, form mixed solution B；
Step S13：By 0.5g graphite alkene ultrasonic disperses in alcohol solvent, ultrasonic time is 1h, forms solution C；
Step S14：During solution C to be dropwise added drop-wise to the solution B for persistently stirring, continue to stir 2h, form mixed solution D；
Step S15：Mixed solution D is placed in baking oven, 120 DEG C are incubated 4 hours, obtain consolidating for iron manganese phosphate for lithium precursor
Body powder, the ground machine of this pressed powder is ground after 2h, and 200 eye mesh screens are crossed after 120 DEG C of dryings of vacuum, obtains finely dispersed mixed
Compound E；
Step S16：Mixture E is put in tube furnace, under nitrogen protection, heating rate is 2 DEG C/min, 680 DEG C of insulations
8 hours, obtain nano lithium iron manganese composite positive pole.
Iron manganese phosphate for lithium composite positive pole prepared by embodiment 1 carries out SEM and tem analysis, and its SEM is schemed such as Fig. 2 institutes
Show, TEM figures are as shown in Figure 3.There are Fig. 2, Fig. 3 to understand, the iron manganese phosphate for lithium composite positive pole is nanoscale, particle size distribution is equal
It is even and compound with graphite alkene.
Embodiment 2
A kind of iron manganese phosphate for lithium composite positive pole and preparation method thereof, its preparation method comprises the steps：
Step S21：By LITHIUM BATTERY raw material lithium carbonate, manganese nitrate, ferric nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, second
Acetoacetic ester is Li according to mol ratio Jing after sand mill processes 30min：Mn：Fe：P=1.1:0.8:0.2:1 carries out weighing (theory
Product is 1 mole), and be dissolved in successively in deionized water and oxalic acid, magnetic agitation to formation clear solution A；
Step S22：Weigh 12g organic carbonates to add in solution A, magnetic agitation, when solution colour fades to dark brown,
5g ethyl acetate is added, after magnetic agitation 1h, mixed solution B is formed；
Step S23：By 0.5g graphite alkene ultrasonic disperses in alcohol solvent, ultrasonic time is 1h, forms solution C；
Step S24：During solution C to be dropwise added drop-wise to the solution B for persistently stirring, continue to stir 2h, form mixed solution D；
Step S25：Mixed solution D is placed in baking oven, 100 DEG C are incubated 10 hours, obtain iron manganese phosphate for lithium precursor
Pressed powder, the ground machine of this pressed powder is ground after 2h, and 300 eye mesh screens are crossed after 120 DEG C of dryings of vacuum, obtains finely dispersed
Mixture E；
Step S26：Mixture E is put in tube furnace, under nitrogen protection, heating rate is 1/ minute, 900 DEG C of insulations
2.5 hours, obtain nano lithium iron manganese composite positive pole.
Embodiment 3
A kind of iron manganese phosphate for lithium composite positive pole and preparation method thereof, its preparation method comprises the steps：
Step S31：By LITHIUM BATTERY raw material lithium carbonate, manganese nitrate, ferric nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, second
Acetoacetic ester is Li according to mol ratio Jing after sand mill processes 30min：Mn：Fe：P=1.1:0.8:0.2:1 carries out weighing (theory
Product is 1 mole), and be dissolved in successively in deionized water and oxalic acid, magnetic agitation to formation clear solution A；
Step S32：Weigh 8g oxalic acid to add in solution A, magnetic agitation when solution colour fades to dark brown, adds 3g
Aromatic hydrocarbon, after magnetic agitation 1h, forms mixed solution B；
Step S33：By 0.5g graphite alkene ultrasonic disperses in alcohol solvent, ultrasonic time is 1h, forms solution C；
Step S34：During solution C to be dropwise added drop-wise to the solution B for persistently stirring, continue to stir 2h, form mixed solution D；
Step S35：Mixed solution D is placed in baking oven, 450 DEG C are incubated 2 hours, obtain consolidating for iron manganese phosphate for lithium precursor
Body powder, the ground machine of this pressed powder is ground after 2h, and 50 eye mesh screens are crossed after 120 DEG C of dryings of vacuum, obtains finely dispersed mixed
Compound E；
Step S36：Mixture E is put in tube furnace, under nitrogen protection, heating rate is 15/ minute, 900 DEG C of insulations
2.5 hours, obtain nano lithium iron manganese composite positive pole.
Embodiment 4
A kind of iron manganese phosphate for lithium composite positive pole and preparation method thereof, its preparation method comprises the steps：
Step S41：By LITHIUM BATTERY raw material lithium carbonate, manganese nitrate, ferric nitrate, ammonium dihydrogen phosphate, ethylenediaminetetraacetic acid, second
Acetoacetic ester is Li according to mol ratio Jing after sand mill processes 30min：Mn：Fe：P=1.1:0.8:0.2:1 carries out weighing (theory
Product is 1 mole), and be dissolved in successively in dimethyl sulfoxide, magnetic agitation to formation clear solution A；
Step S42：Weigh 14g aromatic hydrocarbon to add in solution A, magnetic agitation treats that solution colour fades to dark brown, forms mixed
Close solution B；
Step S43：By 0.5g graphite alkene ultrasonic disperses in alcohol solvent, ultrasonic time is 1h, forms solution C；
Step S44：During solution C to be dropwise added drop-wise to the solution B for persistently stirring, continue to stir 2h, form mixed solution D；
Step S45：Mixed solution D is placed in baking oven, 300 DEG C are incubated 5 hours, obtain consolidating for iron manganese phosphate for lithium precursor
Body powder, the ground machine of this pressed powder is ground after 2h, and 50 eye mesh screens are crossed after 120 DEG C of dryings of vacuum, obtains finely dispersed mixed
Compound E；
Step S46：Mixture E is put in tube furnace, under nitrogen protection, heating rate is 8/ minute, 700 DEG C of insulations 12
Hour, obtain nano lithium iron manganese composite positive pole.
Comparison example 1
Using raw material and preparation process in embodiment 1, only graphite alkene is replaced to prepare positive electrode with Graphene.
Comparison example 2
Using raw material and preparation process in embodiment 1, only graphite alkene is replaced to prepare positive electrode with carbon nano-fiber.
Comparison example 3
Using raw material and preparation process in embodiment 1, only graphite alkene is replaced to prepare positive electrode with superconduction electro-graphitic.
Lithium ion battery embodiment
The iron manganese phosphate for lithium composite positive pole and comparative example 1-3 positive electrode for being prepared with embodiment 1-4 respectively is activity
Material, acetylene black is conductive agent, and Kynoar is binding agent, is fabricated to battery positive pole piece, with metal lithium sheet as negative pole, is pressed
More solito mode is assembled into lithium ion battery.
The performance test of lithium ion battery：
The various embodiments described above lithium ion battery is carried out respectively following performance test, test result is as shown in table 1 below.Its
In, charge-discharge test voltage is 2.0～4.25V in each embodiment in table 1, and the discharge and recharge of lithium ion battery is bent in embodiment 1
Line is as shown in figure 4,125 Posterior circle capability retention curves of 1C rate charge-discharges are as shown in Figure 5.
Table 1
From above-mentioned table 1 and Fig. 4,5, with iron manganese phosphate for lithium composite positive pole provided in an embodiment of the present invention with positive pole
The lithium ion battery of material has high electric discharge gram volume and excellent circulation characteristic and high circulation volume conservation rate, hence it is evident that
Higher than the correlated performance of lithium ion battery in comparison example 1-3.Therefore, the positive electrode for providing containing above-described embodiment can be
Long-term work under the conditions of high current, can be used on the special installations such as high power energy storage device, also be it general on electric automobile
And application is provided and ensured.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., all should be included within protection scope of the present invention.
Claims (8)
1. a kind of iron manganese phosphate for lithium composite positive pole, it is characterised in that：The iron manganese phosphate for lithium composite positive pole size is
Nanoscale, and graphite alkene is compounded with iron manganese phosphate for lithium base material, the quality of the graphite alkene is the iron manganese phosphate for lithium base material
The 0.5%-5% of quality；The iron manganese phosphate for lithium composite positive pole is to enter iron manganese phosphate for lithium composite positive pole presoma
Row milled processed, Jing 50-300 mesh sieves the heat treatment in the protective atmosphere, at 500-900 DEG C, is then made annealing treatment
Formed；Wherein, the annealing is to be cooled to room temperature with the speed of 1-5 DEG C/min in protective atmosphere.
2. iron manganese phosphate for lithium composite positive pole as claimed in claim 1, it is characterised in that：
The iron manganese phosphate for lithium composite positive pole size is 10-80nm.
3. a kind of preparation method of iron manganese phosphate for lithium composite positive pole, comprises the steps：
Mol ratio according to each element of iron manganese phosphate for lithium will be carried out in nano level lithium source, manganese source, source of iron, phosphorus source addition solvent
Dissolution process, obtains clear solution A；
Chelating agent is added in the clear solution A, and carries out mixed processing, obtain mixed liquid B；
Graphite alkene solution is added in the mixed liquid B, and carries out mixed processing, obtain mixed liquor C；Wherein, the graphite alkene
The amount that solution is added ensures that graphite alkene is the theoretical 0.5-5% for generating iron manganese phosphate for lithium quality；The quality of the graphite alkene solution
Concentration is 20%-80%, and drops to the drop rate in the mixed liquid B for 1d/min-10d/min；
Mixed liquor C is dried, iron manganese phosphate for lithium composite positive pole presoma is obtained；
The iron manganese phosphate for lithium composite positive pole presoma is ground into process, Jing 50-300 mesh sieves after protectiveness gas
Heat treatment in atmosphere, at 500-900 DEG C, is then made annealing treatment；Wherein, the annealing is with 1- in protective atmosphere
The speed of 5 DEG C/min is cooled to room temperature.
4. the preparation method of iron manganese phosphate for lithium composite positive pole as claimed in claim 3, it is characterised in that：The 500-
The time of heat treatment is 2-24 hours at 900 DEG C.
5. the preparation method of iron manganese phosphate for lithium composite positive pole as claimed in claim 3, it is characterised in that：To described
In the step of chelating agent is added in bright solution A, the amount that the chelating agent is added is the theoretical 10- for generating iron manganese phosphate for lithium quality
50%.
6. the preparation method of the iron manganese phosphate for lithium composite positive pole as described in claim 3,4,5 is arbitrary, it is characterised in that：Institute
Chelating agent is stated at least one in ethylenediaminetetraacetic acid, organic carbonate, oxalic acid.
7. the positive electrode of a kind of lithium battery anode, including collector and combination on the collector, it is characterised in that：It is described
Positive electrode is the arbitrary described iron manganese phosphate for lithium composite positive pole of claim 1-2 or arbitrary described by claim 3-6
Iron manganese phosphate for lithium composite positive pole preparation method prepare iron manganese phosphate for lithium composite positive pole.
8. a kind of lithium battery, it is characterised in that the lithium battery includes the lithium battery anode described in claim 7.
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| CN108305992B (en) * | 2017-01-12 | 2020-05-12 | 中国科学院化学研究所 | Carbon-coated lithium ion battery electrode material and preparation method thereof |
| CN107331850B (en) * | 2017-07-10 | 2019-08-16 | 河南大学 | A kind of preparation method of anode material for lithium-ion batteries |
| CN107394155B (en) * | 2017-07-10 | 2019-08-16 | 河南大学 | A kind of doping modification method of lithium cobalt oxide cathode material for lithium ion battery |
| CN107732176B (en) * | 2017-09-26 | 2021-04-06 | 深圳市德方纳米科技股份有限公司 | Preparation method of nano-grade lithium ion battery anode material |
| CN109860536B (en) * | 2018-12-18 | 2021-12-03 | 廊坊绿色工业技术服务中心 | Lithium-rich manganese-based material and preparation method and application thereof |
| CN114927689A (en) * | 2022-04-29 | 2022-08-19 | 深圳市德方纳米科技股份有限公司 | Positive electrode material and preparation method and application thereof |
| CN114899394B (en) * | 2022-06-29 | 2023-12-19 | 蜂巢能源科技股份有限公司 | Modified lithium iron manganese phosphate positive electrode material and preparation method and application thereof |
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