CN108539146A - A kind of lithium ion battery composite cathode material and the preparation method and application thereof - Google Patents
A kind of lithium ion battery composite cathode material and the preparation method and application thereof Download PDFInfo
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- CN108539146A CN108539146A CN201810215359.9A CN201810215359A CN108539146A CN 108539146 A CN108539146 A CN 108539146A CN 201810215359 A CN201810215359 A CN 201810215359A CN 108539146 A CN108539146 A CN 108539146A
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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
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
Abstract
The present invention discloses a kind of lithium ion battery composite cathode material and the preparation method and application thereof, first weigh suitable stoichiometric than lithium carbonate and aluminium oxide be placed in ball mill, ethyl alcohol is roasted after ball milling as dispersant, cooling, is crossed dusting cover and is obtained LiAlO2Powder；Again using lithium hydroxide, phosphoric acid, manganese sulfate monohydrate and ferrous sulfate heptahydrate as reactant, ethylene glycol is solvent, prepares LiAlO2‑LiMn0.5Fe0.5PO4Presoma；Finally by LiAlO2‑LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 carries out ball milling dispersion, is put in the tube furnace of logical inert gas and calcines after ball milling, cooling, crosses dusting cover and obtains LiAlO2‑LiMn0.5Fe0.5PO4/ C composite positive poles.The grain diameter of lithium ion battery composite cathode material prepared by the present invention is uniform, good dispersion, crystallinity height, stable structure, densification, obtained material has nano level grain size and rodlike pattern, and LiAlO2The impedance that restrained effectively in charge and discharge process between electrode and electrolyte interface increases, and is conducive to the chemical property for improving material.
Description
Technical field
The present invention relates to technical field of lithium ion, and in particular to a kind of lithium ion battery composite cathode material and its system
Preparation Method and application.
Background technology
With the continuous growth of population in the world, the energy that human lives are consumed is on the increase, it is predicted that the whole world in 2100
Energy consumption will be present three times.Therefore, a large amount of fossil fuel such as oil, coal and natural gas etc. is by continuous exploitation profit
With not only resulting in fossil energy increasingly depleted, and seriously destroy environment and ecology.In order to maintain holding for human society
Supervention exhibition so that countries in the world are dedicated to the scientific research and development of new energy and the relevant technologies.Wherein, secondary cell is efficient, cleans nothing
Pollution, as the power or accessory power supply of internal-combustion engine vehicle, can effectively reduce the consumption of fuel.Compared to tradition
Lead accumulator and nickel metal hydride, lithium ion battery is in cycle life, energy density, power density and environmental-friendly performance
It is upper with the obvious advantage.Although there is certain gap with fuel cell in energy density, the high manufacturing cost of fuel cell with
And to achieve commercialization difficult for complicated production technology.Therefore, lithium ion battery is the following electric vehicle and mixing
The ideal power power supply of power battery.
Due to resourceful and cheap nontoxic, the LiFePO of iron4Positive electrode is studied the most by scientist
Extensively, and shiploads of merchandise has been obtained.LiFePO4Theoretical specific capacity be up to 170mAhg-1, energy density 550Wh
Kg-1, there is good cycle performance and security performance, and as the positive electrode of power lithium-ion battery first choice.But ferric phosphate
For lithium there is also the essence defect that can not be ignored, summing up mainly has the following：(1) sintering when prepared by LiFePO4
In the process, iron oxide there is a possibility that be reduced into fe under high-temperature reductibility atmosphere.Fe can cause battery
Micro-short circuit is the substance most abstained from battery；(2) there are the defects in some performances for LiFePO4, such as tap density and compacting
Density is very low, causes the energy density of lithium ion battery relatively low.Cryogenic property is poor, does not have by its nanosizing and carbon coating
Solve the problems, such as this；(3) manufacturing cost of material and the manufacturing cost of battery are higher, and finished battery rate is low, and consistency is poor.Cause
This, it is necessary to develop novel phosphate cathode material.Same LiFePO4Equally, LiMnPO4Olivine-type structure is also belonged to,
Theoretical capacity is 171mAhg-1, workbench is in 4.1V (vs.Li+/ Li) left and right, stablize in commercialized electrolyte at present
Area, energy density 701WhKg-1, compare LiFePO4It is high by 20%.In addition, the storage of manganese is abundant, therefore LiMnPO4Former material
Expect of low cost, and LiMnPO4Synthesis condition there is no LiFePO4It is so harsh, so more and more scientific research personnel start
Attention LiMnPO has been placed on4On.But LiMnPO4Electronic conductivity and lithium ion diffusion coefficient it is very low, lead to material
Electrochemistry can be brought into play well, and limit its commercial applications.
Invention content
It is an object of the invention to overcome defect of the existing technology, a kind of nano bar-shape LiAlO is provided2-
LiMn0.5Fe0.5PO4/ C composite positive poles and the preparation method and application thereof.Raw material sources of the present invention are extensive, easy to operate, can
Control property is good, reproducibility is high, and obtained material granule is smaller, particle diameter distribution is uniform, crystallinity is high, to reduce material preparation
While cost, the chemical property of material is improved.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of preparation method of lithium ion battery composite cathode material, includes the following steps：
(1) weigh suitable stoichiometric than lithium carbonate and aluminium oxide be placed in ball mill, ethyl alcohol is as dispersant, ball milling
After roast, be cooled to room temperature, cross dusting cover obtain LiAlO2White powder；
(2) lithium hydroxide, phosphoric acid are dissolved in ethylene glycol respectively, form lithium hydroxide solution, phosphoric acid solution；By a water sulphur
Sour manganese, ferrous sulfate heptahydrate are added in deionized water, add ethylene glycol, stir evenly to form mixed solution；By phosphoric acid solution
It is slowly dropped in lithium hydroxide solution, abundant magnetic agitation, forms white suspension, it, will after phosphoric acid solution completion of dropwise addition
Mixed solution is slowly dropped in above-mentioned white suspension, is added dropwise to complete rear magnetic agitation, and step (1) LiAlO is added2White powder
End, magnetic agitation, suspension are transferred in high pressure stainless steel cauldron, are reacted 6-12h at 160-200 DEG C, are cooled to room temperature, from
The heart, washing and drying, obtain LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by step (2) LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 is placed in ball mill,
Ethyl alcohol is put in the tube furnace of logical inert gas after ball milling and is calcined as dispersant, after being cooled to room temperature, is crossed dusting cover and is obtained
LiAlO2-LiMn0.5Fe0.5PO4/ C composite positive poles.
The suitable stoichiometric ratio of further scheme, lithium carbonate and aluminium oxide described in step (1) is 1.05:1.
Further scheme, the LiAlO described in step (1)2Powder is α-LiAlO2Powder.
Further scheme, the LiAlO described in step (2)2The additive amount of powder presses LiMn0.5Fe0.5PO4The 1 of quality~
10wt% is added, preferential 3~5wt%.
Further scheme, the lithium, phosphorus, manganese, iron element molal weight ratio be 3:1:0.5:0.5.
Further scheme, it is molten that phosphoric acid solution described in step (2) with the speed of 1mL/min is slowly dropped to lithium hydroxide
In liquid, manganese sulfate and ferrous sulfate mixed solution are added drop-wise to the speed of 2mL/min in suspension.
Further scheme, the inert gas described in step (3) are hydrogen-argon-mixed body, wherein Ar:H2=95:5.
Further scheme, the calcining described in step (3) are first to calcine 3h at 350 DEG C, then heat at 600 DEG C and forge
Burn 5h.
It is another object of the present invention to provide the lithium ion composite positive poles prepared by above-mentioned preparation method, should
The chemical formula of composite positive pole is LiAlO2-LiMn0.5Fe0.5PO4/ C is nano bar-shape structure.
The present invention also provides a kind of above-mentioned lithium ion battery composite cathode materials in power lithium-ion battery positive electrode
Application.
Compared with prior art, beneficial effects of the present invention：
1, LiAlO prepared by the present invention2-LiMn0.5Fe0.5PO4The grain diameters of/C composite positive poles is uniform, structure is steady
It is fixed, fine and close, wherein α-LiAlO2It is a kind of lithium fast-ionic conductor, and there is high lithium ion conductivity, rises in the composite
To skeletal support and electric action, the stabilization of electrode structure is maintained.
2, the material granule uniformity of the invention synthesized, good dispersion, crystallinity are high, and obtained material has nanoscale
Grain size and rodlike pattern, and LiAlO2It restrained effectively between electrode and electrolyte interface in charge and discharge process
Impedance increases, and is conducive to the chemical property for improving material.
3, the material that the present invention obtains has the cycle life of considerable reversible capacity, excellent high rate performance and stabilization,
So that there is the material very high actual use to be worth, it can effectively meet the actual requirement of the various applications of lithium ion battery.
4, anode material for lithium-ion batteries prepared by the present invention has higher theoretical capacity and quick charge-discharge performance,
The energy density and power density of lithium ion battery are improved, used raw material are cheap and easy to get.
Description of the drawings
Fig. 1 is LiAlO obtained by the embodiment of the present invention2-LiMn0.5Fe0.5PO4XRD diagram (a of/C composite positive poles：Implement
1 sample of example；b：2 sample of embodiment；c：3 sample of embodiment).
Fig. 2 is LiAlO obtained by the embodiment of the present invention2-LiMn0.5Fe0.5PO4The SEM of/C composite positive poles schemes (a：Implement
1 sample of example；b：2 sample of embodiment；c：3 sample of embodiment；d：4 sample of embodiment).
Fig. 3 is LiAlO obtained by the embodiment of the present invention2-LiMn0.5Fe0.5PO4/ C composite positive poles form battery for the first time
Charging and discharging curve (a：1 sample of embodiment；b：2 sample of embodiment；c：3 sample of embodiment).
Fig. 4 is LiAlO obtained by the embodiment of the present invention2-LiMn0.5Fe0.5PO4/ C composite positive poles form 5C times of battery
Rate cycle performance curve (a：1 sample of embodiment；b：2 sample of embodiment；c：3 sample of embodiment).
Specific implementation mode
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol；In 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution；Phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension；After phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.0471g2Powder is added in suspension, and magnetic agitation 30min, finally will be upper
It states suspension to pour into the high pressure stainless steel cauldron of 200mL volumes, and 10h is reacted at 180 DEG C；After being cooled to room temperature, from
The heart, with deionized water and absolute ethyl alcohol respectively washing 3 times, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (3wt%) composite positive pole.
As shown in Figure 1, showing that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds, have
Single olivine structural, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nanometer rods
Shape, and the length of nanometer rods, within the scope of 100~200nm, width is in 100nm or so, as shown in Figure 2.The product of gained is made
For electrode material, experiment fastening lithium ionic cell is assembled into the glove box full of argon gas, with 0.05C multiplying powers in 2.4-4.5V
Between carry out charge and discharge cycles, LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is /C (3wt%) composite positive pole for the first time
130.9mAh·g-1, as shown in Figure 3；From fig. 4, it can be seen that the discharge capacity for the first time under the big multiplying powers of 5C is 106.3mAhg-1, capacity is 92.5mAhg after recycling 100 weeks-1, it is shown that excellent fast charging and discharging performance and cyclical stability.
Embodiment 2
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol；In 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution；Phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension；After phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.0785g2Powder is added in suspension, and magnetic agitation 30min, finally will be upper
It states suspension to pour into the high pressure stainless steel cauldron of 200mL volumes, and 10h is reacted at 180 DEG C, after being cooled to room temperature, from
The heart, with deionized water and absolute ethyl alcohol respectively washing 3 times, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (5wt%) composite positive pole.
As shown in Figure 1, showing that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds, have
Single olivine structural, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nanometer rods
Shape, and the length of nanometer rods, within the scope of 100~200nm, width is in 100nm or so, as shown in Figure 2.The product of gained is made
For electrode material, experiment fastening lithium ionic cell is assembled into the glove box full of argon gas, with 0.05C multiplying powers in 2.4-4.5V
Between carry out charge and discharge cycles, LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is /C (5wt%) composite positive pole for the first time
137.6mAh·g-1, as shown in Figure 3；From fig. 4, it can be seen that the discharge capacity for the first time under the big multiplying powers of 5C is 106.3mAhg-1, capacity is 94.5mAhg after recycling 100 weeks-1, it is shown that excellent fast charging and discharging performance and cyclical stability.
Embodiment 3
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol；In 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution, and phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension, after phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.157g2Powder is added in suspension, and magnetic agitation 30min, finally will be above-mentioned
Suspension pours into the high pressure stainless steel cauldron of 200mL volumes, and reacts 10h at 180 DEG C, after being cooled to room temperature, centrifugation,
With respectively washing 3 times of deionized water and absolute ethyl alcohol, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (10wt%) composite positive pole.
As shown in Figure 1, showing that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds, have
Single olivine structural, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nanometer rods
Shape, and the length of nanometer rods, within the scope of 100~200nm, width is in 100nm or so, as shown in Figure 2.The product of gained is made
For electrode material, experiment fastening lithium ionic cell is assembled into the glove box full of argon gas, with 0.05C multiplying powers in 2.4-4.5V
Between carry out charge and discharge cycles, LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is /C (10wt%) composite positive pole for the first time
105.1mAh·g-1, as shown in Figure 3；From fig. 4, it can be seen that the discharge capacity for the first time under the big multiplying powers of 5C is 91.1mAhg-1, capacity is 80.0mAhg after recycling 100 weeks-1, it is shown that excellent fast charging and discharging performance and cyclical stability.
Embodiment 4
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol, in 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution, and phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension, after phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.0785g2Powder is added in suspension, and magnetic agitation 30min, finally will be upper
It states suspension to pour into the high pressure stainless steel cauldron of 200mL volumes, and 12h is reacted at 160 DEG C, after being cooled to room temperature, from
The heart, with deionized water and absolute ethyl alcohol respectively washing 3 times, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (5wt%) composite positive pole.
Show that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds have single olivine
Structure, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nano bar-shape, and nanometer rods
Length within the scope of 50~150nm, width is in 100nm or so.Using the product of gained as electrode material, full of argon gas
It is assembled into experiment fastening lithium ionic cell in glove box, charge and discharge cycles are carried out between 2.4-4.5V with 0.05C multiplying powers,
LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is 142.5mAhg to/C (5wt%) composite positive pole for the first time-1；It is big again in 5C
Discharge capacity for the first time under rate is 110.8mAhg-1, capacity is 107.7mAhg after recycling 100 weeks-1, it is shown that it is excellent
Fast charging and discharging performance and cyclical stability.
Embodiment 5
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol；In 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution；Phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension, after phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.0785g2Powder is added in suspension, and magnetic agitation 30min, finally will be upper
It states suspension to pour into the high pressure stainless steel cauldron of 200mL volumes, and 6h is reacted at 200 DEG C, after being cooled to room temperature, from
The heart, with deionized water and absolute ethyl alcohol respectively washing 3 times, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (5wt%) composite positive pole.
Show that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds have single olivine
Structure, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nano bar-shape, and nanometer rods
Length within the scope of 100~200nm, width is in 100nm or so.Using the product of gained as electrode material, full of argon gas
Glove box in be assembled into experiment fastening lithium ionic cell, charge and discharge cycles are carried out between 2.4-4.5V with 0.05C multiplying powers,
LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is 128.6mAhg to/C (5wt%) composite positive pole for the first time-1；It is big again in 5C
Discharge capacity for the first time under rate is 105.8mAhg-1, capacity is 91.5mAhg after recycling 100 weeks-1, it is shown that excellent is fast
Fast charge-discharge performance and cyclical stability.
Embodiment 6
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol, in 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution；Phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension, after phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.0785g2Powder is added in suspension, and magnetic agitation 30min, finally will be upper
It states suspension to pour into the high pressure stainless steel cauldron of 200mL volumes, and 10h is reacted at 200 DEG C, after being cooled to room temperature, from
The heart, with deionized water and absolute ethyl alcohol respectively washing 3 times, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (5wt%) composite positive pole.
Show that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds have single olivine
Structure, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nano bar-shape, and nanometer rods
Length within the scope of 100~300nm, width is in 100nm or so.Using the product of gained as electrode material, full of argon gas
Glove box in be assembled into experiment fastening lithium ionic cell, charge and discharge cycles are carried out between 2.4-4.5V with 0.05C multiplying powers,
LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is 135.2mAhg to/C (5wt%) composite positive pole for the first time-1；It is big again in 5C
Discharge capacity for the first time under rate is 108.4mAhg-1, capacity is 96.6mAhg after recycling 100 weeks-1, it is shown that excellent is fast
Fast charge-discharge performance and cyclical stability.
Embodiment 7
(1) by 0.0525mol lithium carbonates (Li2CO3) and 0.05mol aluminium oxide (Al2O3) be placed in ball mill, ethyl alcohol is made
For dispersant, then ball milling 5h is put in Muffle furnace and roasts 10h at 650 DEG C, after being cooled to room temperature, crosses dusting cover and obtains α-
LiAlO2White powder；
(2) by 0.03mol lithium hydroxides (LiOHH2) and 0.01mol phosphoric acid (H O3PO4) be dissolved in respectively 40mL and
In 20mL ethylene glycol, in 0.005mol manganese sulfate monohydrates (MnSO4·H2) and 0.005mol ferrous sulfate heptahydrates (FeSO O4·
7H2O 10mL deionized waters are first added in), manganese sulfate monohydrate is made to be first dissolved in water, 30mL second two is then added thereto again
Alcohol stirs evenly to form mixed solution；Phosphoric acid solution is then slowly dropped to lithium hydroxide solution with the speed of 1mL/min
In, and along with abundant magnetic agitation, form white suspension, after phosphoric acid solution completion of dropwise addition, and then by manganese sulfate and
Ferrous sulfate mixed solution is slowly dropped to the speed of 2mL/min in above-mentioned suspension, continues magnetic agitation after dripping
Then 10min will take the α-LiAlO obtained by 0.157g2Powder is added in suspension, and magnetic agitation 30min, finally will be above-mentioned
Suspension pours into the high pressure stainless steel cauldron of 200mL volumes, and reacts 10h at 200 DEG C, after being cooled to room temperature, centrifugation,
With respectively washing 3 times of deionized water and absolute ethyl alcohol, dry 10h obtains LiAlO2-LiMn0.5Fe0.5PO4Presoma；
(3) by LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 weigh after as in ball mill,
Then ethyl alcohol is put in logical hydrogen-argon-mixed body (wherein Ar as dispersant, ball milling 5h:H2=95:5) in tube furnace, first exist
3h is calcined at 350 DEG C, then heats at 600 DEG C and calcines after 5h is cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C (10wt%) composite positive pole.
Show that obtained product is LiAlO through XRD detections2-LiMn0.5Fe0.5PO4/ C compounds have single olivine
Structure, and crystallinity is high.It learns that the even particle size of products therefrom is consistent from SEM, is nano bar-shape, and nanometer rods
Length within the scope of 200~300nm, width is in 100nm or so.Using the product of gained as electrode material, full of argon gas
Glove box in be assembled into experiment fastening lithium ionic cell, charge and discharge cycles are carried out between 2.4-4.5V with 0.05C multiplying powers,
LiAlO2-LiMn0.5Fe0.5PO4Discharge capacity is 119.8mAhg to/C (10wt%) composite positive pole for the first time-1；It is big again in 5C
Discharge capacity for the first time under rate is 104.5mAhg-1, capacity is 86.3mAhg after recycling 100 weeks-1, it is shown that excellent is fast
Fast charge-discharge performance and cyclical stability.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to case study on implementation, and described herein one
As principle be applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to implementation cases here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (10)
1. a kind of preparation method of lithium ion battery composite cathode material, which is characterized in that include the following steps：
（1）Weigh suitable stoichiometric than lithium carbonate and aluminium oxide be placed in ball mill, ethyl alcohol is roasted after ball milling as dispersant
It burns, is cooled to room temperature, cross dusting cover and obtain LiAlO2White powder；
（2）Lithium hydroxide, phosphoric acid are dissolved in ethylene glycol respectively, form lithium hydroxide solution, phosphoric acid solution；By sulfuric acid monohydrate
Manganese, ferrous sulfate heptahydrate are added in deionized water, add ethylene glycol, stir evenly to form mixed solution；Phosphoric acid solution is delayed
Slowly it is added drop-wise in lithium hydroxide solution, abundant magnetic agitation, forming white suspension will mix after phosphoric acid solution completion of dropwise addition
It closes solution to be slowly dropped in above-mentioned white suspension, is added dropwise to complete rear magnetic agitation, step is added（1）LiAlO2White powder
End, magnetic agitation, suspension are transferred in high pressure stainless steel cauldron, are reacted 6-12h at 160-200 DEG C, are cooled to room temperature, from
The heart, washing and drying, obtain LiAlO2-LiMn0.5Fe0.5PO4Presoma；
（3）By step（2）LiAlO2-LiMn0.5Fe0.5PO4Presoma and glucose in mass ratio 2:1 is placed in ball mill, ethyl alcohol
It as dispersant, is put in the tube furnace of logical inert gas and calcines after ball milling, after being cooled to room temperature, cross dusting cover and obtain LiAlO2-
LiMn0.5Fe0.5PO4/ C composite positive poles.
2. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（1）
Described in lithium carbonate and aluminium oxide suitable stoichiometric ratio be 1.05:1.
3. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（1）
Described in LiAlO2Powder is α-LiAlO2Powder.
4. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（2）
Described in LiAlO2The additive amount of powder presses LiMn0.5Fe0.5PO41 ~ 10wt% of quality is added, preferential 3 ~ 5wt%.
5. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that the lithium,
Phosphorus, manganese, iron element molal weight ratio be 3:1:0.5:0.5.
6. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（2）
Described in phosphoric acid solution be slowly dropped in lithium hydroxide solution with the speed of 1mL/min, manganese sulfate and ferrous sulfate mixing
Solution is added drop-wise to the speed of 2mL/min in suspension.
7. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（3）
Described in inert gas be hydrogen-argon-mixed body, wherein Ar: H2 = 95 : 5。
8. the preparation method of lithium ion battery composite cathode material according to claim 1, which is characterized in that step（3）
Described in calcining be first at 350 DEG C to calcine 3h, then heat at 600 DEG C and calcine 5h.
9. a kind of lithium ion composite positive pole as prepared by claim 1-8 any one of them preparation methods, special
Sign is that the chemical formula of the composite positive pole is LiAlO2-LiMn0.5Fe0.5PO4/ C is nano bar-shape structure.
10. lithium ion battery composite cathode material as claimed in claim 9 answering in power lithium-ion battery positive electrode
With.
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| CN117410481A (en) * | 2023-12-14 | 2024-01-16 | 河南众新储能科技有限公司 | High-performance nano single crystal positive electrode material and preparation method thereof |
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