CN106025212A - Aluminum magnesium fluoride-coated lithium nickel cobalt manganese oxide positive electrode material and preparation method thereof - Google Patents
Aluminum magnesium fluoride-coated lithium nickel cobalt manganese oxide positive electrode material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum magnesium fluoride-coated lithium nickel cobalt manganese oxide positive electrode material and a preparation method thereof. The preparation method comprises the steps of (a) mixing a lithium nickel cobalt manganese oxide spinel material with a water-soluble aluminum salt, a water-soluble magnesium salt and water, adding a water solution of a water-soluble fluoride salt, generating an aluminum fluoride sediment and a magnesium fluoride sediment and coating the surface of the lithium nickel cobalt manganese oxide spinel material to obtain a solid-liquid mixture; and (b) sequentially carrying out solid-liquid separation, washing, drying and roasting on the obtained solid-liquid mixture to obtain the aluminum magnesium fluoride-coated lithium nickel cobalt manganese oxide positive electrode material. The aluminum magnesium fluoride-coated lithium nickel cobalt manganese oxide positive electrode material has good cycle performance and rate capability.
Description
Technical field
The present invention relates to cell art, be specifically related to nickel-cobalt lithium manganate cathode material of a kind of magnalium fluorine cladding and preparation method thereof.
Background technology
The research of rich lithium manganese base solid solution positive electrode at present is concentrated mainly on xLi2MnO3·(1-X)LiMO2(M=Mn, Ni, Co) type stratiform-layed solid-solution material and xLi2MnO3·(1-x)Li1+yMn2yO4(0<x<1；0 y 0.33) layered-spinel solid-solution material.But manganio solid solution also has gap in terms of circulation volume conservation rate and high rate performance.
Summary of the invention
It is an object of the invention to provide nickel-cobalt lithium manganate cathode material of a kind of magnalium fluorine cladding and preparation method thereof, the nickel-cobalt lithium manganate cathode material cycle performance of this magnalium fluorine cladding and good rate capability.
For achieving the above object, the present invention provides the preparation method of the nickel-cobalt lithium manganate cathode material that a kind of magnalium fluorine is coated with, this preparation method includes: a, nickle cobalt lithium manganate spinel is mixed with water-soluble aluminum salt, water-soluble magnesium salt and water after, add the aqueous solution of water solublity villiaumite, generate aluminium fluoride and Afluon (Asta) precipitates and is coated on the surface of described nickle cobalt lithium manganate spinel, obtain solidliquid mixture；B, gained solidliquid mixture is carried out successively solid-liquid separation, wash, be dried and roasting, obtain magnalium fluorine cladding nickel-cobalt lithium manganate cathode material；Wherein, nickle cobalt lithium manganate spinel consist of LixMn1-a-bNiaCobOy, a be 0.1-0.4, b be 0.1-0.4, x be 1-2, y be (x+3)/2；Weight 1-3 that gross weight the is described nickle cobalt lithium manganate spinel weight % of the described surface coated aluminium fluoride of nickle cobalt lithium manganate spinel and Afluon (Asta), described aluminium fluoride is (1-3) with the mol ratio of Afluon (Asta): 1.
Preferably, described a is 1/6, and described b is 1/6, and described x is 1, and y is 2.
Preferably, in step a, described aluminium salt is aluminum nitrate or aluminum sulfate, and described magnesium salt is magnesium chloride, magnesium sulfate or magnesium nitrate, and described villiaumite is ammonium fluoride, sodium fluoride or potassium fluoride.
Preferably, in stepb, described solid-liquid separation is heating evaporating water, filtration or centrifugation, and the heating-up temperature of described heating evaporating water is 75-100 DEG C, described solidliquid mixture is heated to weight and no longer changes；Described dry temperature is 90-140 DEG C, and the time being dried is 5-20 hour；The temperature of described roasting is 300-500 DEG C, and the time of roasting is 3-10 hour.
Preferably, the preparation method of described nickle cobalt lithium manganate spinel includes: use coprecipitation to prepare manganese cobalt nickel positive electrode material precursor；It is sintered after manganese cobalt nickel positive electrode material precursor and lithium carbonate are mixed, obtains described nickle cobalt lithium manganate spinel.
Preferably, the step that described employing coprecipitation prepares manganese cobalt nickel positive electrode material precursor includes: is dissolved in water after nickel sulfate, aluminum sulfate and cobaltous sulfate being mixed, obtains sulfate liquor；The aqueous solution using sodium carbonate carries out precipitation process to described sulfate liquor, is precipitated mixture；Gained precipitation mixture is put in reactor after ripening at 60-90 DEG C carries out solid-liquid separation, washing, is vacuum dried at 100-140 DEG C after 4-20 hour, obtain described manganese cobalt nickel positive electrode material precursor.
Preferably, the temperature of described sintering processes is 800-1000 DEG C, and the time is 10-12 hour.
The present invention also provides for the nickel-cobalt lithium manganate cathode material of a kind of magnalium fluorine cladding, the nickel-cobalt lithium manganate cathode material of described magnalium fluorine cladding includes nickle cobalt lithium manganate spinel and is coated on described nickle cobalt lithium manganate spinel aluminium fluoride and Afluon (Asta), wherein, described nickle cobalt lithium manganate spinel consist of LixMn1-a-bNiaCobOy, a be 0.1-0.4, b be 0.1-0.4, x be 1-2, y be (x+3)/2；Weight 1-3 that gross weight the is described nickle cobalt lithium manganate spinel weight % of the described surface coated aluminium fluoride of nickle cobalt lithium manganate spinel and Afluon (Asta), described aluminium fluoride is (1-3) with the mol ratio of Afluon (Asta): 1.
Preferably, described a is 1/6, and described b is 1/6, and described x is 1, and y is 2.
Preferably, described aluminium fluoride and Afluon (Asta) use coprecipitation to be coated on the surface of described nickle cobalt lithium manganate spinel.
The inventive method has the advantage that
Anti-over-charging power, structural stability, high temperature cyclic performance and the good rate capability of the nickel-cobalt lithium manganate cathode material of the magnalium fluorine cladding of the present invention.
Accompanying drawing explanation
Figure 1It is the XRD of the nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding prepared by the embodiment of the present inventionFigureXRD with uncoated magnalium fluorine nickel-cobalt lithium manganate cathode materialFigure。
Figure 2It it is the nickel-cobalt lithium manganate cathode material of magnalium fluorine of the present invention cladding?Scanning electron microscopeFigure (Amplify 2K).
Figure 3It it is the nickel-cobalt lithium manganate cathode material of magnalium fluorine of the present invention cladding?Scanning electron microscopeFigure (Amplify 10K).
Figure 4It is nickel-cobalt lithium manganate cathode material and 50 circulation specific discharge capacities of uncoated magnalium fluorine nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding prepared by the embodiment of the present inventionFigureWith circulation electric discharge coulombic efficiencyFigure。
Figure 5Be the embodiment of the present invention prepare magnalium fluorine cladding nickel-cobalt lithium manganate cathode material and uncoated magnalium fluorine nickel-cobalt lithium manganate cathode material different multiplying under discharge capacity testFigure。
Figure 6It it is the capacity-differential voltage curve of the nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding prepared by the embodiment of the present invention.
Figure 7It is nickel-cobalt lithium manganate cathode material and the AC impedance curve of uncoated magnalium fluorine nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding prepared by the embodiment of the present invention.
Detailed description of the invention
The present invention provides the preparation method of the nickel-cobalt lithium manganate cathode material that a kind of magnalium fluorine is coated with, this preparation method includes: a, nickle cobalt lithium manganate spinel is mixed with water-soluble aluminum salt, water-soluble magnesium salt and water after, add the aqueous solution of water solublity villiaumite, generate aluminium fluoride and Afluon (Asta) precipitates and is coated on the surface of described nickle cobalt lithium manganate spinel, obtain solidliquid mixture；B, gained solidliquid mixture is carried out successively solid-liquid separation, wash, be dried and roasting, obtain magnalium fluorine cladding nickel-cobalt lithium manganate cathode material；Wherein, nickle cobalt lithium manganate spinel consist of LixMn1-a-bNiaCobOy, a be 0.1-0.4, b be 0.1-0.4, x be 1-2, y be (x+3)/2, it is preferable that described a is 1/6, and described b is 1/6, and described x is 1, and y is 2；Weight 1-3 that gross weight the is described nickle cobalt lithium manganate spinel weight % of the described surface coated aluminium fluoride of nickle cobalt lithium manganate spinel and Afluon (Asta), described aluminium fluoride is (1-3) with the mol ratio of Afluon (Asta): 1.
According to the present invention, in step a, described aluminium salt, magnesium salt and villiaumite are well-known to those skilled in the art, such as, described aluminium salt can be aluminum nitrate or aluminum sulfate, and described magnesium salt can be magnesium chloride, magnesium sulfate or magnesium nitrate, and described villiaumite can be ammonium fluoride, sodium fluoride or potassium fluoride.
According to the present invention, solid-liquid separation, wash, be dried and roasting be well-known to those skilled in the art, such as, in stepb, described solid-liquid separation is heating evaporating water, filtration or centrifugation, the heating-up temperature of described heating evaporating water is 75-100 DEG C, described solidliquid mixture is heated to weight and no longer changes；Described dry temperature is 90-140 DEG C, and the time being dried is 5-20 hour；The temperature of described roasting is 300-500 DEG C, and the time of roasting is 3-10 hour.
According to the present invention, nickle cobalt lithium manganate spinel is well-known to those skilled in the art, and its preparation method may include that employing coprecipitation prepares manganese cobalt nickel positive electrode material precursor；It is sintered after manganese cobalt nickel positive electrode material precursor and lithium carbonate are mixed, obtains described nickle cobalt lithium manganate spinel；Wherein, the step that described employing coprecipitation prepares manganese cobalt nickel positive electrode material precursor may include that and is dissolved in water after nickel sulfate, aluminum sulfate and cobaltous sulfate being mixed, and obtains sulfate liquor；The aqueous solution using sodium carbonate carries out precipitation process to described sulfate liquor, is precipitated mixture；Gained precipitation mixture is put in reactor after ripening at 60-90 DEG C carries out solid-liquid separation, washing, is vacuum dried at 100-140 DEG C after 4-20 hour, obtain described manganese cobalt nickel positive electrode material precursor；The temperature of described sintering processes can be 800-1000 DEG C, and the time can be 10-12 hour.The concentration present invention of described sulfate solution is the most unrestricted, and those skilled in the art can regulate as required, and in sulfate solution, the mol ratio of nickel sulfate, aluminum sulfate and cobaltous sulfate is allocated according to the composition of the nickle cobalt lithium manganate spinelle of required preparation.
The present invention also provides for the nickel-cobalt lithium manganate cathode material of a kind of magnalium fluorine cladding, the nickel-cobalt lithium manganate cathode material of described magnalium fluorine cladding includes nickle cobalt lithium manganate spinel and is coated on described nickle cobalt lithium manganate spinel aluminium fluoride and Afluon (Asta), wherein, described nickle cobalt lithium manganate spinel consist of LixMn1-a-bNiaCobOy, a be 0.1-0.4, b be 0.1-0.4, x be 1-2, y be (x+3)/2, it is preferable that described a is 1/6, and described b is 1/6, and described x is 1, and y is 2；Weight 1-3 that gross weight the is described nickle cobalt lithium manganate spinel weight % of the described surface coated aluminium fluoride of nickle cobalt lithium manganate spinel and Afluon (Asta), described aluminium fluoride is (1-3) with the mol ratio of Afluon (Asta): 1.
Coprecipitation can be used to be coated on the surface of described nickle cobalt lithium manganate spinel according to the present invention, described aluminium fluoride and Afluon (Asta).
Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Embodiment of the present invention manganese salt, nickel source, cobalt salt and villiaumite are respectively manganese sulfate monohydrate (MnSO4·H2O), seven water nickel sulfate (NiSO4·7H2O), cobalt sulfate (CoSO4·7H2And ammonium fluoride (NH O)4F)。
Preparation embodiment 1
Preparation embodiment 1 prepares manganese cobalt nickel positive electrode material precursor [Mn4/6Ni1/6Co1/6]CO3
(1) it is respectively configured MnSO4Solution (0.8mol/L), NiSO4Solution (0.8mol/L), CoSO4Solution (0.8mol/L), Na2CO3(0.2mol/L) solution 80ml, 20ml, 20ml and 480ml, the mol ratio keeping Ni, Mn, Co is 4:1:1, is then sufficiently stirred for joined solution on magnetic stirring apparatus and makes it fully dissolve.
(2) first install and clean reactor, the air inside logical nitrogen eliminating, in reactor, add 50ml deionized water, be warming up to 50 DEG C.After temperature stabilization, add 20mlNiSO4Solution and 5mlCoSO4Solution.Meanwhile starting stirring, mixing speed is 900r/m.
After (3) 5 minutes, constant voltage burette is used to drip 40mlNa in reactor2CO3Solution.Protective gas to be passed through continuously.
(4) Na of 40ml is treated2CO3After solution dropping, the temperature of water-bath, after 10 minutes, is risen to 85 DEG C by insulated and stirred.Meanwhile, remaining sulfate liquor is mixed in a beaker.
(5) water-bath temperature is stablized after being raised to 85 DEG C 10 minutes, then uses constant pressure funnel respectively by remaining Na2CO3Solution and sulfate liquor are added drop-wise in reactor.Note, Na2CO3Being 30 minutes with the rate of addition of sulfate liquor than about 2:1, time for adding, mixing speed is constant.
(6) after all solution are all added drop-wise in reactor, insulated and stirred 4h.It is then cut off nitrogen stream, stops stirring, insulation ageing 15h.
(7), after ageing, after waiting temperature of liquid to drop to room temperature, precipitate in reactor is poured in beaker, abundant washing precipitate.Filter the precipitate washed, dry sediment 15h at 110 DEG C, obtain manganese cobalt nickel positive electrode material precursor [Mn4/6Ni1/6Co1/6]CO3。
Preparation embodiment 2
Preparation embodiment 2 prepares nickle cobalt lithium manganate spinel LiMn4/6Ni1/6Co1/6O2。
(1), Li and Mn and the Li of 1:0.667 weighing in molar ratio2CO3, in order to compensate the loss of Li, Li in sintering process2CO3Actual weight is theoretical 110%.
(2) preparation embodiment 1 gained manganese cobalt nickel positive electrode material precursor [Mn, it is fully ground4/6Ni1/6Co1/6]CO3And Li2CO3About 30min.
(3), with crucible take up ground powder to be sintered in Muffle furnace, burn 12h with 5 DEG C/min ramp to 900 DEG C, cool down after burning-out, obtain nickle cobalt lithium manganate spinel LiMn4/6Ni1/6Co1/6O2, by gained nickle cobalt lithium manganate spinel LiMn4/6Ni1/6Co1/6O2Carrying out the discharge capacity test under XRD analysis, 50 circulations discharge test, different multiplying, capacity-differential voltage test and exchange resistance test, result is shown inFigure 1、Figure 4-7WithTable 1。
Embodiment 1-3 prepares the nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding.
Embodiment 1
(1), first configuration mol ratio is the Al (NO of 2:13)3With Mg (NO3)2Solution, weighs nickle cobalt lithium manganate spinel and the NH of preparation embodiment 2 preparation according to the weight 1 weight % that the gross weight of aluminium fluoride and Afluon (Asta) is described nickle cobalt lithium manganate spinel4F is respectively put in deionized water to be placed on magnetic stirring apparatus and is sufficiently stirred for；
(2), then by nickle cobalt lithium manganate spinel, Mg (NO3)2With Al (NO3)3It is mixed into a beaker, in being placed into the water-bath that temperature is 85 DEG C, continues stirring；
(3), by NH4F is dropwise added drop-wise in mixed solution beaker, and heated and stirred is until deionized water goes not evaporate；
(4), be washed with deionized, the presoma of the nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding that 115 DEG C of dry 12h obtain, be placed in tube furnace, at N2Heat preservation sintering 5h under environment, furnace cooling obtains the nickel-cobalt lithium manganate cathode material 1 of magnalium fluorine cladding, carries out the discharge capacity test under XRD analysis, scanning electron microscope analysis, 50 circulations discharge test, different multiplying and capacity-differential voltage test, and result is shown inFigure 1-6WithTable 1。
Embodiment 2-3
Embodiment 2-3 and the difference of embodiment 1 are the heavy % of the weight 2 weight % that gross weight is described nickle cobalt lithium manganate spinel and 3 of aluminium fluoride and Afluon (Asta), obtain the nickel-cobalt lithium manganate cathode material 2 and 3 of magnalium fluorine cladding, carrying out the discharge capacity test under XRD analysis, 50 circulations discharge test, different multiplying, capacity-differential voltage test respectively and exchange resistance test, result is shown inFigure 1、Figure 4-7WithTable 1。
Comparative example 1
This comparative example 1 is to be added without magnesium salt with the difference of embodiment 2, controls the weight 2 that weight the is described nickle cobalt lithium manganate spinel weight % of aluminium fluoride, obtains the nickel-cobalt lithium manganate cathode material D1 of aluminum fluorine cladding, carries out 50 circulation discharge tests, and result is shown inTable 1。
Comparative example 2
This comparative example 2 is to be added without magnesium salt and aluminium salt with the difference of embodiment 2, but add calcium nitrate and precipitate with ammonium fluoride, control the weight 2 that weight the is described nickle cobalt lithium manganate spinel weight % of calcium fluoride, obtain the nickel-cobalt lithium manganate cathode material D2 of aluminum fluorine cladding, carrying out 50 circulation discharge tests, result is shown inTable 1。
Comparative example 3
Comparative example 3 and the difference of embodiment 1 are the heavy % of the weight 4 that gross weight is described nickle cobalt lithium manganate spinel of aluminium fluoride and Afluon (Asta), obtain the nickel-cobalt lithium manganate cathode material D3 of magnalium fluorine cladding, carry out 50 circulation discharge tests, and result is shown inTable 1。
FromFigure 1Vertical coordinate is intensity, unit a.u., and abscissa is angle, unit for °) it can be seen that the present invention prepare cladding and uncoated magnalium fluorine cladding nickel-cobalt lithium manganate cathode material be spinel structure.
FromFigure 2-3It can be seen that the nickel-cobalt lithium manganate cathode material that cladding magnalium fluorine prepared by the present invention is coated with is spherical, rough surface, it is coated with little granule.
FromFigure 4Vertical coordinate is specific discharge capacity, unit is mA h/g, abscissa is cycle-index, unit is secondary) can be seen that, the nickel-cobalt lithium manganate cathode material of cladding magnalium fluorine cladding is compared with uncoated nickel-cobalt lithium manganate cathode material, and specific discharge capacity is high, and along with cycle-index increases, effect becomes apparent from, and illustrates to be coated with nickel-cobalt lithium manganate cathode material structural stability, high temperature cyclic performance and the good rate capability of magnalium fluorine cladding.
FromFigure 5Vertical coordinate is specific discharge capacity, unit is mA h/g, abscissa is cycle-index, unit is secondary) can be seen that, the nickel-cobalt lithium manganate cathode material of cladding magnalium fluorine cladding is compared with uncoated nickel-cobalt lithium manganate cathode material, and under different multiplying, specific discharge capacity is high, and along with cycle-index and multiplying power increase, effect becomes apparent from, and illustrates that the nickel-cobalt lithium manganate cathode material anti-over-charging power being coated with magnalium fluorine cladding is good.
FromFigure 6Vertical coordinate is Differential Capacity dQ/dv, and abscissa is voltage, and unit is volt) can be seen that material reaction mechanism in charge and discharge process, the Li to cladding 3 weight %1Mn4/6Ni1/6Co1/6O2Capacity-differential voltage curve has been done in first three circulation, it is clear that the redox reaction that material is in charge and discharge process.
FromFigure 7Can be seen that material Li1Mn4/6Ni1/6Co1/6O2AC impedance contrast before and after 3 weight % claddingsFigure, two groups of data all circulate 3 times and obtain, and after cladding, solid liquid interface impedance and the charge migration resistance of material also reduce a lot.When material granule is coated with by Mg-Al-F, the transition-metal oxide of positive electrode is in the package status of fluoride, avoids as far as possible contacting with the direct of electrolyte, reduces interface resistance, and make the surface texture of material the most stable, improve the cycle performance of battery.
FromTable 1Can be seen that, the nickel-cobalt lithium manganate cathode material (embodiment 1-3) of cladding magnalium fluorine cladding prepared by embodiment and uncoated nickel-cobalt lithium manganate cathode material (preparation embodiment 2), the nickel-cobalt lithium manganate cathode material (comparative example 3) of the nickel-cobalt lithium manganate cathode material (comparative example 1-2) and excess cladding magnalium fluorine cladding that are coated with other material is compared, not only first charge-discharge specific capacity has superiority, and the discharge and recharge after 50 times also takes advantage than specific capacity, capability retention is good, illustrate that nickel-cobalt lithium manganate cathode material structural stability and the high temperature cyclic performance of the cladding magnalium fluorine cladding that the present invention provides are good.
Table 150 circulation Discharge test of preparation material prepared by embodiment 1, embodiment 1-3, comparative example 1-3
Claims (10)
1. the preparation method of the nickel-cobalt lithium manganate cathode material of a magnalium fluorine cladding, it is characterised in that
This preparation method includes:
A, nickle cobalt lithium manganate spinel is mixed with water-soluble aluminum salt, water-soluble magnesium salt and water after,
Add the aqueous solution of water solublity villiaumite, generate aluminium fluoride and Afluon (Asta) precipitates and is coated on described nickel cobalt
The surface of LiMn2O4 spinel, obtains solidliquid mixture；
B, gained solidliquid mixture is carried out successively solid-liquid separation, wash, be dried and roasting, obtain
The nickel-cobalt lithium manganate cathode material of magnalium fluorine cladding；
Wherein, nickle cobalt lithium manganate spinel consist of LixMn1-a-bNiaCobOy, a is
0.1-0.4, b be 0.1-0.4, x be 1-2, y be (x+3)/2；Described nickle cobalt lithium manganate spinelle
The aluminium fluoride of material surface cladding and the gross weight of Afluon (Asta) are described nickle cobalt lithium manganate spinel
Weight 1-3%, the mol ratio of described aluminium fluoride and Afluon (Asta) is (1-3): 1.
Preparation method the most according to claim 1, it is characterised in that described a is 1/6,
Described b is 1/6, and described x is 1, and y is 2.
Preparation method the most according to claim 1, it is characterised in that in step a, institute
Stating aluminium salt is aluminum nitrate or aluminum sulfate, and described magnesium salt is magnesium chloride, magnesium sulfate or magnesium nitrate, described
Villiaumite is ammonium fluoride, sodium fluoride or potassium fluoride.
Preparation method the most according to claim 1, it is characterised in that in stepb, institute
State solid-liquid separation for heating evaporating water, filtration or centrifugation, adding of described heating evaporating water
Hot temperature is 75-100 DEG C, described solidliquid mixture is heated to weight and no longer changes；Described dry
Temperature be 90-140 DEG C, be dried time be 5-20 hour；The temperature of described roasting is
300-500 DEG C, the time of roasting is 3-10 hour.
Preparation method the most according to claim 1, it is characterised in that described nickle cobalt lithium manganate
The preparation method of spinel includes:
Coprecipitation is used to prepare manganese cobalt nickel positive electrode material precursor；
It is sintered after manganese cobalt nickel positive electrode material precursor and lithium carbonate are mixed, obtains described
Nickle cobalt lithium manganate spinel.
Preparation method the most according to claim 5, it is characterised in that described employing is co-precipitated
Method is prepared the step of manganese cobalt nickel positive electrode material precursor and is included: by nickel sulfate, aluminum sulfate and cobaltous sulfate
It is dissolved in water after mixing, obtains sulfate liquor；The aqueous solution using sodium carbonate is molten to described sulfate
Liquid carries out precipitation process, is precipitated mixture；Gained precipitation mixture is put in reactor
At 60-90 DEG C, ripening carries out solid-liquid separation, washing, enters at 100-140 DEG C after 4-20 hour
After row vacuum drying, obtain described manganese cobalt nickel positive electrode material precursor.
Preparation method the most according to claim 5, it is characterised in that described sintering processes
Temperature is 800-1000 DEG C, and the time is 10-12 hour.
8. the nickel-cobalt lithium manganate cathode material of a magnalium fluorine cladding, it is characterised in that described magnalium
The nickel-cobalt lithium manganate cathode material of fluorine cladding includes nickle cobalt lithium manganate spinel and is coated on institute
Stating nickle cobalt lithium manganate spinel aluminium fluoride and Afluon (Asta), wherein, described nickle cobalt lithium manganate point is brilliant
Stone material consist of LixMn1-a-bNiaCobOy, a be 0.1-0.4, b be 0.1-0.4, x be 1-2,
Y is (x+3)/2；The described surface coated aluminium fluoride of nickle cobalt lithium manganate spinel and Afluon (Asta)
Weight 1-3 that gross weight is described nickle cobalt lithium manganate spinel weight %, described aluminium fluoride and fluorine
The mol ratio changing magnesium is (1-3): 1.
The nickel-cobalt lithium manganate cathode material of magnalium fluorine the most according to claim 8 cladding, it is special
Levying and be, described a is 1/6, and described b is 1/6, and described x is 1, and y is 2.
The nickel-cobalt lithium manganate cathode material of magnalium fluorine the most according to claim 8 cladding, its
Being characterised by, described aluminium fluoride and Afluon (Asta) use coprecipitation to be coated on described nickle cobalt lithium manganate point
The surface of spinel.
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| CN110337744A (en) * | 2017-06-26 | 2019-10-15 | 株式会社半导体能源研究所 | The manufacturing method and secondary cell of positive active material |
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