CN110247039A - A kind of nickel lithium manganate cathode material preparation method coating strontium titanate base conductive coating - Google Patents
A kind of nickel lithium manganate cathode material preparation method coating strontium titanate base conductive coating Download PDFInfo
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- CN110247039A CN110247039A CN201910519747.0A CN201910519747A CN110247039A CN 110247039 A CN110247039 A CN 110247039A CN 201910519747 A CN201910519747 A CN 201910519747A CN 110247039 A CN110247039 A CN 110247039A
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- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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Abstract
The invention discloses a kind of nickel lithium manganate cathode material preparation methods for coating strontium titanate base conductive coating, weigh strontium salt or strontium hydroxide and titanium salt, the third metal salt by the molar ratio of 1:1:X；A certain amount of triethylene glycol is added in strontium salt or strontium hydroxide and titanium salt, the third metal salt, is heated to dissolve, obtains solution A；Weigh nickel lithium manganate cathode material；Nickel lithium manganate cathode material is added in mixed solution A while being added suspending agent by mixed solution heating stirring, and mechanical stirring obtains mixing suspension B；Under stiring, precipitating reagent is added into mixing suspension B；Mixing suspension filters after mixing suspension in step (5) is continued stirring, washs, dry, obtains the nickel lithium manganate cathode material of conductive coating containing strontium titanate base.The present invention can make nickel lithium manganate cathode material have better specific discharge capacity, and be able to maintain or improve nickel lithium manganate cathode material discharge capacity.
Description
Technical field
The present invention relates to technical field of lithium ion battery positive pole material preparation, and in particular to a kind of cladding strontium titanate base is conductive
Nickel lithium manganate cathode material of coating and preparation method thereof.
Background technique
Lithium ion battery plays increasingly important role in electronic product, the various fields such as electric car.As one
Kind of positive electrode, nickel ion doped have operating voltage high (> 4.5V), specific energy it is high, it is resourceful, have a safety feature and be free of cobalt
One of therefore the small advantage of environmental pollution, and become current widely used anode material for lithium-ion batteries.But nickel manganese
Sour lithium remains some defects, such as cycle performance, high rate performance and high-temperature behavior difference.The presence of these problems makes manganese
Sour lithium anode material receives biggish obstruction in production application.Method modified applied to nickel ion doped at present is main
Have: metal ion mixing and surface cladding.Ion doping needs to consider Doped ions and the interionic matching of Mn, may lead
The structure of nickel lithium manganate cathode material is caused to change or collapse;Surface coats then without the concern for coating and nickel ion doped anode material
Matching between material, coating the coating that a layer thickness is suitable, evenly dispersed on nickel lithium manganate cathode material surface can effectively protect
The dissolution for protecting Mn in nickel lithium manganate cathode material, improves the cycle performance and high-temperature behavior of nickel lithium manganate cathode material.Currently,
The surface coated material of nickel lithium manganate cathode material mainly has metal oxide, carbon nanomaterial, nonmetal oxide etc..But
It is that above-mentioned coating material electronic conductivity and ionic conductivity are lower, this can effectively improve nickel ion doped anode to a certain extent
A possibility that cycle performance of material, attenuating is corroded by HF, but its specific discharge capacity will be declined, and electrode and electrolysis are caused
The interface resistance of liquid is higher, thus sacrifices specific discharge capacity.
In recent years, some lithium ion solid electrolyte materials, such as Li1.3Al0.3Ti1.7 (PO4) 3, since it has
Preferable lithium ion conductivity and electronic conductance, stable in the air, cost is relatively low, therefore in positive electrode coating side
There is potential application in face.However this kind of material in having environment existing for lithium metal since the reduction reaction of Ti4+/Ti3+ easily occurs,
Therefore it is easy to decompose.Further, since the material component is complicated, preparation process is also more complex, needs high-temperature process, it is difficult to accurate to adjust
Each element ratio is controlled, industrial mass production is unfavorable for.
Summary of the invention
It can make nickel lithium manganate cathode material that there is better specific discharge capacity, and energy the purpose of the present invention is to provide a kind of
Keep or improve the nickel lithium manganate cathode material system of the cladding strontium titanate base conductive coating of nickel lithium manganate cathode material discharge capacity
Preparation Method.
The technical solution of the invention is as follows:
A kind of nickel lithium manganate cathode material preparation method coating strontium titanate base conductive coating, it is characterized in that: including the following steps:
(1) strontium salt or strontium hydroxide and titanium salt, the third metal salt are weighed by 1:1: X molar ratio；
(2) a certain amount of triethylene glycol is added in strontium salt or strontium hydroxide and titanium salt, the third metal salt, is heated to dissolve, obtains
Solution A；
(3) nickel lithium manganate cathode material is weighed；
(4) nickel lithium manganate cathode material is added in solution A while being added suspending agent by solution A heating stirring, mechanical stirring,
Obtain mixing suspension B；
(5) under stiring, precipitating reagent is added into mixing suspension B；
(6) mixing suspension filters after the mixing suspension in step (5) being continued stirring, washs, dry, obtains titaniferous
Sour strontium base conductive coating nickel lithium manganate cathode material or conductive strontium titanate material.
Titanium salt is butyl titanate or titanium tetrachloride；Strontium salt is strontium chloride；The third metal salt is molysite, one in niobium salt
Kind is several.
The molysite is one of iron chloride, frerrous chloride, ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate；Institute
Stating niobium salt is one of niobium chloride, nitric acid niobium, ferric sulfate.
Step (3) is to be by the mass ratio of strontium salt or strontium hydroxide and titanium salt gross mass and nickel lithium manganate cathode material
0.5 10:99.5 90 weighs nickel lithium manganate cathode material.
The specific steps of step (4) are as follows: mixed solution is heated to 50 85 DEG C of temperature, is subject to mechanical stirring, and revolving speed is
Nickel lithium manganate cathode material is added in mixed solution A while being added suspending agent, mechanical stirring 0.5- by 100 400r/min
2h, obtains mixing suspension B, and suspending agent dosage is the 0.3 2.5% of triethylene glycol weight.
The specific steps of step (5) are as follows: under 60 80 °C, the mechanical agitation of 100 400r/min, to mixing
It is added precipitating reagent in suspension B, amount hydroxy is 2 times of the amount of the substance of strontium ion in strontium salt or strontium hydroxide in precipitating reagent
To between 3 times.
The specific steps of step (6) are as follows: by the mixing suspension in step (5) at 120-200 DEG C, 100 400r/
Continue to stir 0.5-6 h then mixing suspension filtering under the conditions of min, wash, it is dry, obtain the nickel of conductive coating containing strontium titanate base
Manganate cathode material for lithium.
Suspending agent in step (4) is one or two kinds of mixtures of polyvinylpyrrolidone, polyvinyl alcohol, suspending agent
So that nickel ion doped particle is in suspended state, while can control the grain growth orientation and speed of strontium titanates.
Precipitating reagent in step (5) is the mixture of one or more of ammonium hydroxide, urea, potassium hydroxide, potassium hydroxide,
Promote nickel ion doped to stablize under the environment of alkalinity, avoids the dissolution of manganese in lithium manganate material, while promoting the nucleation of strontium titanates
With growth, the purpose that strontium titanates is synthesized under low temperature is had reached.
The conductive strontium titanate material and nickel lithium manganate cathode material mechanical mixture that step (6) is obtained, it is dry, obtain conduction
Strontium titanates coating positive electrode.
The beneficial effects of the present invention are:
(1) present invention coats nickel lithium manganate cathode material using conductive strontium titanates, and nickel ion doped anode material not only can be improved
The specific discharge capacity of material, and the conductivity of nickel ion doped material can be improved, the impedance of battery is effectively reduced, and improve nickel manganese
The structural stability of sour lithium material improves the cycle life of nickel ion doped battery, the discharge platform of capacity retention ratio and battery
Voltage.
(2) present invention is using strontium titanates as novel anode material coating, and anti-electrolytic corrosion is strong, high-temperature stability
It is good, easily decomposed phosphorus is free of, lithium ion transport energy barrier is low, to guarantee the stability of nickel ion doped material structure, thus mentions
High high voltage high temperature charge-discharge performance.
(3) present invention is using during preparing conductive strontium titanates cladding nickel ion doped, and reaction temperature is low, after being not necessarily to
Continuous calcining step, greatly reduces the energy consumption in production process, also reduces the phase that nickel ion doped may occur in high-temperature process
Change and agglomeration, while this process is readily mass-produced, yield is high, and the reaction time is short.
Strontium titanates is coated on the surface of nickel ion doped particle using collosol-precipitation method by the present invention, and this synthetic method is not
But reaction temperature is low (< 160oC), and reaction carries out under normal pressure, is readily mass-produced.The nickel lithium manganate cathode material surface of preparation
The strontium titanates coating morphology of cladding is evenly dispersed and fine and close, and the thin film layer thickness for constituting the coating is 5 40nm, and the coating is same
When have good ionic conductivity and electron conduction, can make nickel lithium manganate cathode material have better specific discharge capacity,
It is able to maintain or is improved again the discharge capacity of nickel lithium manganate cathode material, is answered to reach and expand nickel lithium manganate cathode material industrialization
Purpose.
Present invention will be further explained below with reference to the attached drawings and examples.
Detailed description of the invention
Fig. 1 is the present invention a kind of XRD, TEM, HRTEM and grain size distribution of strontium titanate material.
Fig. 2 is a kind of conductive strontium titanates coating nickel lithium manganate cathode material of the present invention and uncoated nickel ion doped material fills
Discharge curve.
Fig. 3 is a kind of conductive strontium titanates coating nickel lithium manganate cathode material of the present invention and uncoated nickel ion doped material follows
Ring curve graph.
Fig. 4 is a kind of times of conductive strontium titanates coating nickel lithium manganate cathode material and uncoated nickel ion doped material of the present invention
Rate figure.
Specific embodiment
One, embodiment is prepared
Embodiment 1
A kind of preparation method of conduction strontium titanates coating nickel lithium manganate cathode material, comprising the following steps:
(1) strontium hydroxide and butyl titanate are weighed by the molar ratio of 1:1；
(2) strontium hydroxide and butyl titanate are dissolved in triethylene glycol, are heated to 80 °C, dissolve it sufficiently, obtain mixing molten
Liquid A;
It (3) is that 10:90 weighs nickel manganese by strontium hydroxide and the mass ratio of butyl titanate gross mass and nickel lithium manganate cathode material
Sour lithium anode material；
(4) at 80 °C of mixed solution A temperature, under conditions of blender revolving speed is 300r/min, by nickel lithium manganate cathode material plus
Enter into mixed solution A while being added 0.5% polyvinylpyrrolidone of triethylene glycol weight, molecular weight 36000, machinery stirs
It mixes 30 minutes, obtains mixing suspension B;
(5) under 80 °C, the mechanical agitation of 300r/min, ammonium hydroxide is added into mixing suspension B, the amount of ammonium hydroxide is hydrogen
5 times of strontium oxide strontia weight.
(6) mixing suspension in step (5) is continued to stir 2h under the conditions of 160oC, 300r/min, is then mixed
Suspension filtering is closed, is washed, it is dry, obtain conductive strontium titanates coating nickel lithium manganate cathode material；
Wherein, metal salt could alternatively be iron, niobium, aluminium, any of them such as lithium or several in step (1).
Embodiment 2
A kind of preparation method containing conductive strontium titanates coating nickel lithium manganate cathode material, comprising the following steps:
(1) strontium hydroxide and butyl titanate are weighed by the molar ratio of 1:1；
(2) strontium hydroxide and butyl titanate are dissolved in triethylene glycol, are heated to 80 °C, dissolve it sufficiently, obtain mixing molten
Liquid A;
(3) at 80 °C of mixed solution A temperature, under conditions of blender revolving speed is 300r/min, by nickel lithium manganate cathode material plus
Enter into mixed solution A while being added 0.4% polyvinylpyrrolidone of triethylene glycol weight, molecular weight 50000, machinery stirs
It mixes 30 minutes, obtains mixing suspension B;
(4) under 80 °C, the mechanical agitation of 300r/min, ammonium hydroxide is added into mixing suspension B, the amount of ammonium hydroxide is hydrogen
7 times of strontium oxide strontia weight.
(5) mixing suspension in step (4) is continued to stir 6h under the conditions of 160oC, 300r/min, is then mixed
Suspension filtering is closed, is washed, it is dry, obtain conductive strontium titanate material；
(6) metal salt could alternatively be iron, niobium, aluminium, any of them such as lithium or several in step (1)
(7) dry by obtained conductive strontium titanate material and nickel lithium manganate cathode material mechanical mixture, it obtains conductive strontium titanates and applies
Layer positive electrode.
Two, comparative example
The nickel ion doped material of uncoated conduction strontium titanates coating and embodiment 2 are subjected to battery survey with following experimental method simultaneously
Examination.
Three, experimental method:
X-ray diffraction is carried out with the conductive strontium titanate material that embodiment 2 obtains, is tested with transmission electron microscope (TEM), as a result
As shown in Figure 1, the material crystalline is good, granule-morphology is cubic block, and average-size is 20 rans.
Mixed with the coating material that 10% embodiment 1 is prepared with nickel lithium manganate cathode material, and with without coating treatment
Nickel ion doped be assembled into R2025 type button cell respectively, and the first charge-discharge to them, cycle life and multiplying power are surveyed
Examination, it is as a result as shown in Figure 2, Figure 3 and Figure 4 respectively.
Four, result verification
The battery being assembled into using the conductive strontium titanates coating nickel lithium manganate cathode material that embodiment 1 is prepared as active material
Coulombic efficiency is up to 81.54% after first charge-discharge, and capacity retention ratio is 94.62% after recycling 60 times, and uncoated nickel ion doped
The battery that positive electrode is assembled into as active material coulombic efficiency after first charge-discharge is only 72.28%, is held after circulation 60 times
Measuring conservation rate is 85.88%. after 30 circulations, and discharge capacity difference is obvious, and 5C capacity improves after strontium titanates coats
4 times or so.Therefore, from the result of test data it can be seen that conductive strontium titanates is used largely to mention as clad
High every chemical property of nickel ion doped material.
Claims (10)
1. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating, it is characterized in that: including following step
It is rapid:
(1) strontium salt or strontium hydroxide and titanium salt, the third metal salt are weighed by 1:1: X molar ratio；
(2) a certain amount of triethylene glycol is added in strontium salt or strontium hydroxide and titanium salt, the third metal salt, is heated to dissolve, obtains
Solution A；
(3) nickel lithium manganate cathode material is weighed；
(4) nickel lithium manganate cathode material is added in solution A while being added suspending agent by solution A heating stirring, mechanical stirring,
Obtain mixing suspension B；
(5) under stiring, precipitating reagent is added into mixing suspension B；
(6) mixing suspension filters after the mixing suspension in step (5) being continued stirring, washs, dry, obtains titaniferous
Sour strontium base conductive coating nickel lithium manganate cathode material or conductive strontium titanate material.
2. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: titanium salt is butyl titanate or titanium tetrachloride；Strontium salt is strontium chloride；The third metal salt is molysite, in niobium salt
It is a kind of or several.
3. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 2,
It is characterized in that: the molysite is one of iron chloride, frerrous chloride, ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate；Institute
Stating niobium salt is one of niobium chloride, nitric acid niobium, ferric sulfate.
4. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: step (3), is to be by the mass ratio of strontium salt or strontium hydroxide and titanium salt gross mass and nickel lithium manganate cathode material
0.5 10:99.5 90 weighs nickel lithium manganate cathode material.
5. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the specific steps of step (4) are as follows: mixed solution is heated to 50 85 DEG C of temperature, is subject to mechanical stirring, and revolving speed is
Nickel lithium manganate cathode material is added in mixed solution A while being added suspending agent, mechanical stirring 0.5- by 100 400r/min
2h, obtains mixing suspension B, and suspending agent dosage is the 0.3 2.5% of triethylene glycol weight.
6. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the specific steps of step (5) are as follows: under 60 80 °C, the mechanical agitation of 100 400r/min, to mixing
It is added precipitating reagent in suspension B, amount hydroxy is 2 times of the amount of the substance of strontium ion in strontium salt or strontium hydroxide in precipitating reagent
To between 3 times.
7. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the specific steps of step (6) are as follows: by the mixing suspension in step (5) at 120-200 DEG C, 100 400r/
Continue to stir 0.5-6 h then mixing suspension filtering under the conditions of min, wash, it is dry, obtain the nickel of conductive coating containing strontium titanate base
Manganate cathode material for lithium.
8. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the suspending agent in step (4) is one or two kinds of mixtures of polyvinylpyrrolidone, polyvinyl alcohol.
9. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the precipitating reagent in step (5) is the mixing of one or more of ammonium hydroxide, urea, potassium hydroxide, potassium hydroxide
Object.
10. a kind of nickel lithium manganate cathode material preparation method for coating strontium titanate base conductive coating according to claim 1,
It is characterized in that: the conductive strontium titanate material that step (6) is obtained and nickel lithium manganate cathode material mechanical mixture, dry, led
Electric strontium titanates coating positive electrode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113506869A (en) * | 2021-05-07 | 2021-10-15 | 鹏盛国能(深圳)新能源集团有限公司 | Lithium battery and anode thereof |
| CN113620353A (en) * | 2021-08-06 | 2021-11-09 | 合肥国轩高科动力能源有限公司 | Strontium titanate modified nickel cobalt lithium manganate positive electrode material and lithium ion battery containing same |
| CN115241425A (en) * | 2022-07-01 | 2022-10-25 | 湖南顺隆新能源科技有限公司 | Lithium manganate positive electrode material and preparation method thereof |
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