CN108807969A - Method for reducing residual alkali on surface of layered positive electrode material of lithium ion battery - Google Patents
Method for reducing residual alkali on surface of layered positive electrode material of lithium ion battery Download PDFInfo
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- CN108807969A CN108807969A CN201810371980.4A CN201810371980A CN108807969A CN 108807969 A CN108807969 A CN 108807969A CN 201810371980 A CN201810371980 A CN 201810371980A CN 108807969 A CN108807969 A CN 108807969A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003513 alkali Substances 0.000 title claims abstract description 30
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 29
- 239000007774 positive electrode material Substances 0.000 title abstract 4
- 239000000463 material Substances 0.000 claims abstract description 46
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000005245 sintering Methods 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 30
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000010406 cathode material Substances 0.000 claims description 48
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 24
- 235000019441 ethanol Nutrition 0.000 claims description 22
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 17
- 239000011572 manganese Substances 0.000 claims description 15
- SEVNKUSLDMZOTL-UHFFFAOYSA-H cobalt(2+);manganese(2+);nickel(2+);hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mn+2].[Co+2].[Ni+2] SEVNKUSLDMZOTL-UHFFFAOYSA-H 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 229910004170 Li(NiaCObMnc)O2 Inorganic materials 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 239000010405 anode material Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium;hydroxide;hydrate Chemical compound [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 229910003684 NixCoyMnz Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910015872 LiNi0.8Co0.1Mn0.1O2 Inorganic materials 0.000 description 1
- 229910017223 Ni0.8Co0.1Mn0.1(OH)2 Inorganic materials 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- 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
-
- 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
-
- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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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- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a method for reducing residual alkali on the surface of a layered anode material of a lithium ion battery, which comprises the following steps: s1, adding pure water into the nickel-cobalt-manganese layered positive electrode material, stirring and cleaning to obtain a wet material; s2, mixing the wet material with ethanol, stirring, filtering, and drying to obtain powder; and S3, mixing the powder with the nano oxide, and then sintering. According to the method for reducing the residual alkali on the surface of the layered positive electrode material of the lithium ion battery, provided by the invention, the residual alkali on the surface is reduced through water washing, then the water on the surface of the material is quickly removed through alcohol washing, the residual alkali content of the positive electrode material obtained through treatment is low, the pH value is reduced, and the processing performance of the material is favorably improved.
Description
Technical field
The present invention relates to technical field of lithium ion more particularly to a kind of reduction layered cathode material of lithium ion battery tables
The method of face residual alkali.
Background technology
Layered cathode material Li (NixCoyMnzM1-x-y-z)O2(0.6<x<1,0<y<0.2,0≤z<0.2)) due to its theory
The characteristics of capacity height (275mAh/g) and as one of the crucial main material of lithium ion high specific energy electric core architecture exploitation.In stratified material
In, Ni2+It is the main component of contribution capacity, but with Ni2+The increase of content can cause lithium nickel mixing in sintering process serious,
The coulombic efficiency for influencing lithium ion deintercalation in charge and discharge process, is sintered under the atmosphere of the high pure oxygen of generally use thus, controls Ni2+With
Ni3+Conversion；The followed by high material surface residual alkali of nickel content is higher, surface texture structure during lithium ion deintercalation repeatedly
It is destroyed, and is reacted with electrolyte, lead to poor circulation.The main thought for solving problems is then by material bodies phase
Stably-doped structure and surface modified stable interface.Washing and cladding be it is a kind of can reduce surface residual alkali and stabilizing material surface knot
The effective means of structure.The washing process used to rich lithium material in the patent of Publication No. CN 104518214A is mixed raw material
Technique is unable to reach the result for reducing pH；It needs to use boron after using washing process in Publication No. CN 107394160A patents
The sintering of element secondary high-temperature carries out material structure stabilization, and material pH value can return increasing.For the higher layered cathode material of Ni contents
Expect Li (NixCoyMnzM1-x-y-z)O2(0.6<x<1,0<y<0.2,0≤z<0.2)), to moisture-sensitive, drying course due to when
Between it is long, cause material and water time of contact long, the lattice lithium on surface caused to lack, cause washing after material structure deterioration,
Performance degradation is serious, thus can to drying equipment, more stringent requirements are proposed, and wash after need resintering, but if two burn temperature
It is excessively high that pH value can be caused to return increasing, to influence performance of lithium ion battery.
Invention content
Technical problems based on background technology, the present invention propose a kind of reduction layered cathode material of lithium ion battery
The method of surface residual alkali reduces surface residual alkali by washing, then washes the moisture of quickly removal surface of material by alcohol, through handling
The positive electrode residual alkali content arrived is low, and pH value reduces, and is conducive to the raising of material processing performance.
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1, pure water is added in nickel cobalt manganese layered cathode material, stirring and washing obtains moist material；
S2, it stirs, filters after mixing moist material with ethyl alcohol, drying obtains powder；
S3, powder is mixed with nano-oxide, is then sintered.
Preferably, in S1,0.5-1.5 parts of nickel cobalt manganese layered cathode materials are added in 1-3 parts of 55-65 DEG C of pure water by weight
In, stirring and washing 3-5min filters, obtains moist material.
Preferably, in S1, nickel cobalt manganese layered cathode material chemical formula is Li (NiaCobMnc)O2, wherein 0.8≤a≤
0.9,0.06≤b≤0.1, and a+b+c=1.
Preferably, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide and list
Water lithium hydroxide presses Li:(Ni+Co+Mn) molar ratio is 1.03-1.09:1 is uniformly mixed, and is sintered in pure oxygen atmosphere, sintering temperature
Degree is 730-790 DEG C, and sintering time 12-20h obtains nickel cobalt manganese layered cathode material.
Preferably, in S2,1-5min is stirred after moist material is mixed with ethyl alcohol, is filtered, under 85-95 DEG C of temperature condition
Drying, obtains powder.
Preferably, in S2 amount of alcohol added be S1 in pure water gross mass 30-50wt%.
Preferably, in S3, nano-oxide is nano zircite and/or nano aluminium oxide, and the quality of nano-oxide
For the 0.2-0.8wt% of powder gross mass.
Preferably, it in S3, is sintered in pure oxygen atmosphere, and sintering temperature is 350-450 DEG C, sintering time 1-3h.
Surface residual alkali is reduced by first being washed to layered cathode material in the present invention, reduces material pH value, improves material and adds
Work performance, then alcohol wash quickly removal surface of material moisture, improve drying efficiency, meanwhile, the introducing that alcohol is washed can be precisely controlled
Washing time reduces the degree of structure destruction caused by the long contact of moisture and material；Then it is coated with nano-oxide
It is effectively improved the interface stability of material, reduces the interface side reaction of material and electrolyte.The present invention proposes a kind of reduction
The method of layered cathode material of lithium ion battery surface residual alkali, entire technological process is simple, reduces the requirement to drying equipment, easily
Low through handling obtained positive electrode residual alkali content in large-scale production, pH value reduces, and is conducive to carrying for material processing performance
It is high.
Specific implementation mode
In the following, technical scheme of the present invention is described in detail by specific embodiment.
Embodiment 1
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,1 part of 60 DEG C of pure water is added in 1 part of nickel cobalt manganese layered cathode material by weight, stirring and washing 3min takes out
Filter, obtains moist material；
S2,1min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 90 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 50wt% of pure water gross mass in S1；
S3, powder is mixed with nano aluminium oxide, is then sintered in pure oxygen atmosphere, sintering temperature is 450 DEG C, when sintering
Between 1h；Wherein, the quality of nano aluminium oxide is the 0.3wt% of powder gross mass.
Wherein, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide
(Ni0.8Co0.1Mn0.1(OH)2) with monohydrate lithium hydroxide press Li:(Ni+Co+Mn) molar ratio is 1.09:1 in high speed mixer
It is uniformly mixed, is sintered in pure oxygen atmosphere, sintering temperature is 790 DEG C, sintering time 12h, and obtaining chemical formula is
LiNi0.8Co0.1Mn0.1O2Nickel cobalt manganese layered cathode material.
Embodiment 2
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,1.5 parts of 60 DEG C of pure water are added in 1 part of nickel cobalt manganese layered cathode material by weight, stirring and washing 3min takes out
Filter, obtains moist material；
S2,1min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 90 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 40wt% of pure water gross mass in S1；
S3, powder is mixed with nano zircite, is then sintered in pure oxygen atmosphere, sintering temperature is 400 DEG C, when sintering
Between 3h；Wherein, the quality of nano zircite is the 0.8wt% of powder gross mass.
Wherein, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide
(Ni0.83Co0.11Mn0.06(OH)2) with monohydrate lithium hydroxide press Li:(Ni+Co+Mn) molar ratio is 1.07:1 in high speed mixer
In be uniformly mixed, be sintered in pure oxygen atmosphere, sintering temperature be 770 DEG C, sintering time 20h, obtaining chemical formula is
LiNi0.83Co0.11Mn0.06O2Nickel cobalt manganese layered cathode material.
Embodiment 3
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,3 parts of 60 DEG C of pure water are added in 1.5 parts of nickel cobalt manganese layered cathode materials by weight, stirring and washing 4min takes out
Filter, obtains moist material；
S2,1min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 90 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 40wt% of pure water gross mass in S1；
S3, powder is mixed with nano zircite, nano aluminium oxide, is then sintered in pure oxygen atmosphere, sintering temperature is
400 DEG C, sintering time 2h；Wherein, the quality of nano zircite is the 0.2wt% of powder gross mass, the quality of nano aluminium oxide
For the 0.4wt% of powder gross mass.
Wherein, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide
(Ni0.85Co0.1Mn0.05(OH)2) with monohydrate lithium hydroxide press Li:(Ni+Co+Mn) molar ratio is 1.05:1 in high speed mixer
It is uniformly mixed, is sintered in pure oxygen atmosphere, sintering temperature is 740 DEG C, sintering time 15h, and obtaining chemical formula is
LiNi0.85Co0.1Mn0.05O2Nickel cobalt manganese layered cathode material.
Embodiment 4
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,3 parts of 60 DEG C of pure water are added in 1 part of nickel cobalt manganese layered cathode material by weight, stirring and washing 5min takes out
Filter, obtains moist material；
S2,1min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 90 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 30wt% of pure water gross mass in S1；
S3, powder is mixed with nano zircite, nano aluminium oxide, is then sintered in pure oxygen atmosphere, sintering temperature is
350 DEG C, sintering time 3h；Wherein, the quality of nano zircite is the 0.3wt% of powder gross mass, the quality of nano aluminium oxide
For the 0.4wt% of powder gross mass.
Wherein, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide
(Ni0.9Co0.06Mn0.04(OH)2) with monohydrate lithium hydroxide press Li:(Ni+Co+Mn) molar ratio is 1.03:1 in high speed mixer
It is uniformly mixed, is sintered in pure oxygen atmosphere, sintering temperature is 710 DEG C, sintering time 15h, and obtaining chemical formula is
LiNi0.9Co0.06Mn0.04O2Nickel cobalt manganese layered cathode material.
Embodiment 5
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,2 parts of 55 DEG C of pure water are added in 1 part of nickel cobalt manganese layered cathode material by weight, stirring and washing 4min takes out
Filter, obtains moist material；
S2,4min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 95 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 45wt% of pure water gross mass in S1；
S3, powder is mixed with nano zircite, is then sintered in pure oxygen atmosphere, sintering temperature is 420 DEG C, when sintering
Between 2h；Wherein, the quality of nano zircite is the 0.5wt% of powder gross mass.
Embodiment 6
A kind of method reducing layered cathode material of lithium ion battery surface residual alkali proposed by the present invention, including following step
Suddenly：
S1,2.5 parts of 55 DEG C of pure water are added in 1 part of nickel cobalt manganese layered cathode material by weight, stirring and washing 4min takes out
Filter, obtains moist material；
S2,5min is stirred after mixing moist material with ethyl alcohol, filters, is dried under 85 DEG C of temperature conditions, obtain powder；
Wherein, amount of alcohol added is the 30wt% of pure water gross mass in S1；
S3, powder is mixed with nano zircite, is then sintered in pure oxygen atmosphere, sintering temperature is 380 DEG C, when sintering
Between 2.5h；Wherein, the quality of nano zircite is the 0.2wt% of powder gross mass.
Wherein, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide
(Ni0.9Co0.06Mn0.04(OH)2) with monohydrate lithium hydroxide press Li:(Ni+Co+Mn) molar ratio is 1.03:1 in high speed mixer
It is uniformly mixed, is sintered in pure oxygen atmosphere, sintering temperature is 730 DEG C, sintering time 19h, and obtaining chemical formula is
LiNi0.9Co0.06Mn0.04O2Nickel cobalt manganese layered cathode material.
The anode material for lithium-ion batteries that embodiment 1-4 is obtained is assembled into the positive electrode in corresponding comparative sample
2016 button batteries, test under conditions of 2.75-4.3V discharge ranges, 1C theoretical capacities 200mAh/g, obtain table 1；Wherein, right
It is and to be sintered nickel cobalt manganese hydroxide and monohydrate lithium hydroxide in pure oxygen atmosphere through mixed at high speed in corresponding embodiment than sample
Obtained positive electrode.
The chemical property of 1 embodiment 1-4 materials of table
Anode material for lithium-ion batteries capacity is higher in embodiment as can be seen from Table 1, good cycle, and by washing
Alcohol wash and cladding processing after, the pH of material declines, and is conducive to the promotion of the processing performance of material.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of method reducing layered cathode material of lithium ion battery surface residual alkali, which is characterized in that include the following steps：
S1, pure water is added in nickel cobalt manganese layered cathode material, stirring and washing obtains moist material；
S2, it stirs, filters after mixing moist material with ethyl alcohol, drying obtains powder；
S3, powder is mixed with nano-oxide, is then sintered.
2. the method for reducing layered cathode material of lithium ion battery surface residual alkali according to claim 1, which is characterized in that S1
In, 1-3 parts of 55-65 DEG C of pure water are added in 0.5-1.5 parts of nickel cobalt manganese layered cathode materials by weight, stirring and washing 3-
5min filters, obtains moist material.
3. the method according to claim 1 or claim 2 for reducing layered cathode material of lithium ion battery surface residual alkali, feature exist
In in S1, nickel cobalt manganese layered cathode material chemical formula is Li (NiaCobMnc)O2, wherein 0.8≤a≤0.9,0.06≤b≤
0.1, and a+b+c=1.
4. according to any one of the claim 1-3 methods for reducing layered cathode material of lithium ion battery surface residual alkali,
It is characterized in that, in S1, nickel cobalt manganese layered cathode material is prepared by following technique：By nickel cobalt manganese hydroxide and single water hydrogen-oxygen
Change lithium and presses Li:(Ni+Co+Mn) molar ratio is 1.03-1.09:1 is uniformly mixed, and is sintered in pure oxygen atmosphere, sintering temperature is
730-790 DEG C, sintering time 12-20h obtains nickel cobalt manganese layered cathode material.
5. according to any one of the claim 1-4 methods for reducing layered cathode material of lithium ion battery surface residual alkali,
It is characterized in that, in S2,1-5min is stirred after moist material is mixed with ethyl alcohol, filter, dried under 85-95 DEG C of temperature condition,
Obtain powder.
6. according to any one of the claim 1-5 methods for reducing layered cathode material of lithium ion battery surface residual alkali,
It is characterized in that, amount of alcohol added is the 30-50wt% of pure water gross mass in S1 in S2.
7. according to any one of the claim 1-6 methods for reducing layered cathode material of lithium ion battery surface residual alkali,
It is characterized in that, in S3, nano-oxide is nano zircite and/or nano aluminium oxide, and the quality of nano-oxide is powder
The 0.2-0.8wt% of gross mass.
8. according to any one of the claim 1-7 methods for reducing layered cathode material of lithium ion battery surface residual alkali,
It is characterized in that, in S3, is sintered in pure oxygen atmosphere, and sintering temperature is 350-450 DEG C, sintering time 1-3h.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109616665A (en) * | 2018-12-13 | 2019-04-12 | 合肥国轩高科动力能源有限公司 | Preparation method for reducing residual alkali of nickel cobalt lithium manganate ternary positive electrode material, product and application thereof |
| CN109742376A (en) * | 2019-01-16 | 2019-05-10 | 合肥国轩高科动力能源有限公司 | High-nickel positive electrode material and preparation method thereof |
| CN110040791A (en) * | 2019-04-30 | 2019-07-23 | 合肥国轩高科动力能源有限公司 | Ternary cathode material and preparation method thereof |
| CN111092200A (en) * | 2019-11-13 | 2020-05-01 | 中南大学 | Li3Cr(MoO4)3Coating modified high-nickel ternary cathode material and preparation method thereof |
| CN111370664A (en) * | 2020-03-18 | 2020-07-03 | 溧阳中科海钠科技有限责任公司 | Method for reducing residual alkali content on surface of layered positive electrode material of sodium-ion battery and application |
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| CN112340783A (en) * | 2020-09-30 | 2021-02-09 | 宜宾锂宝新材料有限公司 | Modification method for reducing residual alkali on surface of high-nickel ternary cathode material, high-nickel ternary cathode material prepared by modification method and lithium ion battery |
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