CN117790725A - Lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material and preparation method thereof - Google Patents
Lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material and preparation method thereof Download PDFInfo
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- CN117790725A CN117790725A CN202311772022.5A CN202311772022A CN117790725A CN 117790725 A CN117790725 A CN 117790725A CN 202311772022 A CN202311772022 A CN 202311772022A CN 117790725 A CN117790725 A CN 117790725A
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- conductive carbon
- ion battery
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 title claims abstract description 62
- 239000007774 positive electrode material Substances 0.000 title claims abstract description 42
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 33
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 239000010405 anode material Substances 0.000 claims abstract description 19
- 230000001502 supplementing effect Effects 0.000 claims abstract description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 7
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000011572 manganese Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000001694 spray drying Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910014985 LiMnxFe1-xPO4 Inorganic materials 0.000 claims description 3
- 229910014982 LiMnxFe1−xPO4 Inorganic materials 0.000 claims description 3
- 229910013418 LiNixCoyM1-x-yO2 Inorganic materials 0.000 claims description 3
- 238000005054 agglomeration Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 102220043159 rs587780996 Human genes 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 6
- 238000001035 drying Methods 0.000 abstract description 3
- 238000006138 lithiation reaction Methods 0.000 abstract description 3
- 239000011164 primary particle Substances 0.000 abstract description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 10
- 239000002033 PVDF binder Substances 0.000 description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 8
- 229910008722 Li2NiO2 Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- 229910010699 Li5FeO4 Inorganic materials 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
Classifications
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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
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The embodiment of the application provides a lithium ion battery anode material coated by a lithium-rich lithium supplementing material and a preparation method thereof, and relates to the field of lithium ion batteries. A lithium ion battery anode material coated by a lithium-rich lithium supplementing material comprises: the positive electrode active material can be at least one of lithium iron phosphate (LiFeMxPO 4,0.01< x < 0.1), lithium manganese iron phosphate (LiMnxFe 1-xPO4,0.3 < x < 0.6), ternary (LiNiXCoYM 1-x-yO2,0.1 < x < 0.6,0.3 < x+y < 0.9, M=Mn, al), the lithium-rich base material can be at least one of Li2NiMxO2 (0.02 < x < 0.1), li5FeMxO4 (0.01 < x < 0.1), and the composite conductive carbon tube is uniformly dispersed and coated with primary particles, secondary agglomerates are formed through drying and granulating, the lithium-rich base material is uniformly coated on the surface of the positive electrode active material, wherein the composite conductive carbon tube forms a three-dimensional conductive network in the positive electrode material, the lithium source in the supplementary material is obtained through pre-lithiation, and the energy density of the lithium ion positive electrode active material is improved.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a lithium ion battery anode material coated by a lithium-rich lithium-supplementing material and a preparation method thereof.
Background
The lithium ion battery is a new generation of green energy, and has larger application in the fields of digital codes, automobile power, energy storage, power grid peak shaving and the like. As market demand expands, the energy density requirements for lithium ion batteries are increasing. A lithium ion battery is a secondary battery (rechargeable battery) that operates mainly by means of lithium ions moving between a positive electrode and a negative electrode. Li+ is inserted and extracted back and forth between the two electrodes during charge and discharge: during charging, li+ is deintercalated from the positive electrode, and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging.
When the lithium ion battery is used for the first time in charge and discharge, the negative electrode is easy to irreversibly lose lithium, and the overall electrochemical performance of the overall positive electrode active material is insufficient, so that the service performance of the battery is affected.
Disclosure of Invention
The application aims to at least solve one of the technical problems existing in the prior art that the lithium loss of the first charge-discharge anode is irreversible. Therefore, the application provides a lithium ion battery anode material coated by a lithium-rich lithium-supplementing material, wherein the lithium-rich material is coated with the lithium ion battery anode material, so that irreversible capacity loss (about 10% -15%) caused by formation of an SEI film is counteracted in initial charge of the battery, SEI film loss is supplemented, and the total capacity and energy density of the lithium ion battery are improved by 5% -15%.
According to the embodiment of the application, the lithium ion battery anode material coated by the lithium-rich lithium supplementing material comprises the following components: a lithium-rich base material, a positive electrode active material and a composite conductive carbon tube solution;
the positive electrode active material can be at least one of lithium iron phosphate (LiFeMxPO 4,0.01< x < 0.1), lithium manganese iron phosphate (LiMnxFe 1-xPO4, 0.3.ltoreq.x.ltoreq.0.6), ternary (LiNiXCoYM 1-x-yO2, 0.1.ltoreq.x.ltoreq. 0.6,0.3.ltoreq.x+y.ltoreq.0.9, M=Mn, al);
the lithium-rich base material can be at least one of Li2NiMxO2 (x is more than or equal to 0.02 and less than or equal to 0.1) and Li5FeMxO4 (x is more than or equal to 0.01 and less than or equal to 0.1);
the composite conductive carbon tube solution can be at least one of a composite conductive carbon tube and an oxidized composite conductive carbon tube.
Wherein, the composite conductive carbon tube solution can be replaced by using composite conductive carbon tubes;
according to some embodiments of the present application, the composite conductive carbon tube solution is prepared by combining conductive carbon tubes and oxidizing the composite conductive carbon tubes: NMP material mass ratio 1: 50-100.
According to some embodiments of the application, the composite conductive carbon tube material feeding amount accounts for 0.1-1% of the total mass ratio, and the mass ratio of the lithium-rich base material to the positive electrode material in the final product is 1-10%.
According to the embodiment of the application, the preparation method of the lithium ion battery anode material coated by the lithium-rich lithium supplementing material comprises the following steps:
step one: mixing the composite conductive carbon tube solution in pure water according to a proportion, adding all positive electrode active materials, and stirring and dispersing at a rotating speed of 8000-16000 rpm to form uniform and stable slurry;
step two: adding a lithium-rich base material into the slurry, and stirring and dispersing at the rotating speed of 4500-12500 r/min to form uniform and stable slurry;
step three: and granulating the slurry through pressurized fluid spray drying to form secondary agglomeration positive electrode material precursor particles with the particle size of D50=6-15 um, uniformly coating the surface of the positive electrode active material by the lithium-rich base material, and penetrating the composite conductive carbon tube into the positive electrode active material agglomerates in a three-dimensional conductive network mode.
According to some embodiments of the present application,
in the first step, the feeding amount of the composite conductive carbon tube accounts for 0.1-1% of the total mass ratio;
in the first step, the solid material accounts for 10-70% of the total material;
in the second step, the charging amount of the lithium-rich base material accounts for 1-5% of the mass ratio of the anode material.
According to some embodiments of the present application, in step one, the time is controlled between 0.5 and 2 hours and the viscosity is controlled between 50 and 200cps.
According to some embodiments of the present application, in step two, the time is controlled between 2 and 6 hours and the viscosity is controlled between 100 and 500cps.
According to some embodiments of the present application, in step three, the pressure fluid is controlled at 140-260 ℃ and at a pressure of 0.2-1.0 Mpa.
The beneficial effects of this application are: the liquid phase coating process is adopted, after the composite conductive carbon tube is combined to uniformly disperse and coat primary particles, secondary agglomerates are formed through drying and granulating, and the lithium-rich base material is uniformly coated on the surface of the positive electrode active material, wherein the composite conductive carbon tube forms a three-dimensional conductive network in the positive electrode material, a lithium source in the material is supplemented, and the energy density of the lithium ion positive electrode active material is improved through pre-lithiation.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an SEM image of example 1 according to the invention;
FIG. 2 is an XRD pattern for example 2 according to the invention;
fig. 3 is a charge-discharge diagram in embodiment 3 according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.
Accordingly, the following detailed description of the embodiments of the present application, provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following describes a preparation method of a lithium ion battery anode material coated by a lithium-rich lithium supplementing material according to an embodiment of the application with reference to the accompanying drawings.
According to the embodiment of the application, the lithium ion battery anode material coated by the lithium-rich lithium supplementing material comprises the following components: the positive electrode active material can be at least one of lithium iron phosphate (LiFeMxPO 4,0.01< x < 0.1), lithium manganese iron phosphate (LiMnxFe 1-xPO4, 0.3.ltoreq.x.ltoreq.0.6), ternary (LiNiXCoYM 1-x-yO2, 0.1.ltoreq.x.ltoreq. 0.6,0.3.ltoreq.x+y.ltoreq.0.9, M=Mn, al);
the lithium-rich base material can be at least one of Li2NiMxO2 (x is more than or equal to 0.02 and less than or equal to 0.1) and Li5FeMxO4 (x is more than or equal to 0.01 and less than or equal to 0.1);
the composite conductive carbon tube solution can be at least one of a composite conductive carbon tube and an oxidized composite conductive carbon tube.
Wherein, the composite conductive carbon tube solution can be replaced by using composite conductive carbon tubes;
further, the composite conductive carbon tube solution is prepared by oxidizing the composite conductive carbon tube: NMP material mass ratio 1: 50-100.
Further, the composite conductive carbon tube material feeding amount accounts for 0.1-1% of the total mass ratio, and the mass ratio of the lithium-rich base material to the positive electrode material in the final product is 1-10%.
According to the embodiment of the application, the preparation method of the lithium ion battery anode material coated by the lithium-rich lithium supplementing material further comprises the following steps:
step one: mixing the composite conductive carbon tube solution in pure water according to a proportion, wherein the feeding amount of the composite conductive carbon tube accounts for 0.1-1% of the total mass ratio, adding all positive electrode active materials, wherein the solid materials account for 10-70% of the total materials, stirring and dispersing at the rotating speed of 8000-16000 rpm to form uniform and stable slurry, controlling the time to 0.5-2 h and the viscosity to 50-200 cps;
step two: adding a lithium-rich base material into the slurry, wherein the mass ratio of the lithium-rich base material to the anode material is 1-5%, stirring and dispersing at the rotating speed of 4500-12500 r/min to form uniform and stable slurry, controlling the time to 2-6 h and the viscosity to 100-500 cps;
step three: and (3) carrying out spray drying granulation on the slurry by using a fluid with the temperature of 140-260 ℃ and the pressure of 0.2-1.0 Mpa to form secondary agglomeration positive electrode material precursor particles with the particle size D50=6-15 um, uniformly coating lithium-rich base materials on the surface of the positive electrode active material, and penetrating and existing the composite conductive carbon tubes in the positive electrode active material agglomerates in a three-dimensional conductive network mode.
The liquid phase coating process is adopted, after the composite conductive carbon tube is combined to uniformly disperse and coat primary particles, secondary agglomerates are formed through drying and granulating, and the lithium-rich base material is uniformly coated on the surface of the positive electrode active material, wherein the composite conductive carbon tube forms a three-dimensional conductive network in the positive electrode material, a lithium source in the material is supplemented, and the energy density of the lithium ion positive electrode active material is improved through pre-lithiation.
Example 1
10g of the composite conductive carbon tube is weighed and dissolved in 12500g of deionized water, 2000g of positive electrode active material lithium iron phosphate is added, stirring is started, the speed is 8500 r/min, and stirring is carried out for 1 hour, so that uniform slurry is formed. 100g of Li2NiO2 as a lithium-rich base material was added thereto at 5500 rpm and stirred for 2 hours. Spray drying the mixed slurry at 160 ℃ under 0.2Mpa to obtain secondary agglomerated particle positive electrode active coating lithium-rich base material with the particle size of 6-10 mu m: liFePO4/Li2NiO2. The prepared coated lithium-rich lithium iron phosphate material has the characteristic of high charge capacity. The positive electrode material, polyvinylidene fluoride (PVDF), conductive carbon ink and N-methyl pyrrolidone (NMP) are mixed into slurry, and the slurry is coated on an aluminum foil sheet to prepare the battery pole piece. And then 2032 is assembled, and the charging capacity is 183.4mAh/g when the battery is charged at 0.1C and detected by a Wuhan blue electric (LAND) charging and discharging machine, so that the initial charging capacity is improved by 16.7mAh/g compared with the capacity without coating the lithium-rich base, and the capacity is improved by about 10.02%.
Example 2
20g of the composite conductive carbon tube is weighed and dissolved in 16500g of deionized water, 2000g of the ternary material of the positive electrode active material is added, stirring is started, the speed is 5500 r/min, and stirring is carried out for 2 hours, so that uniform slurry is formed. 120g of Li2NiO2 as a lithium-rich base material was added thereto at 6500 rpm and stirred for 1 hour. Spray drying the mixed slurry at 220 ℃ under 0.4Mpa to obtain secondary agglomerated particle positive electrode active coating lithium-rich base material with the particle size of 4-8 mu m: liNi0.8Co0.2Al0.3/Li2NiO2. The prepared coated lithium-rich ternary material has the characteristic of high charge capacity. The positive electrode material, polyvinylidene fluoride (PVDF), conductive carbon ink and N-methyl pyrrolidone (NMP) are mixed into slurry, and the slurry is coated on an aluminum foil sheet to prepare the battery pole piece. And then 2032 is assembled, and the charging capacity is 237.2mAh/g when the battery is charged at 0.1C and detected by a Wuhan blue electric (LAND) charging and discharging machine, so that the initial charging capacity is improved by 22mAh/g compared with the capacity without coating the lithium-rich base, and the capacity is improved by about 10.22%.
Example 3
20g of the composite conductive carbon tube is weighed and dissolved in 1350g of deionized water, 2000g of positive active material lithium iron manganese phosphate is added, stirring is started, the speed is 8500 r/min, and stirring is carried out for 0.5 hour, so that uniform slurry is formed. 60g of Li5FeO4 as a lithium-rich base material was added thereto at 4500 rpm and stirred for 4 hours. Spray drying the mixed slurry at 180 ℃ under 0.2Mpa to obtain secondary agglomerated particle positive electrode active coating lithium-rich base material with the particle size of 6-12 mu m: liMn0.6Fe0.4/Li5FeO4. The prepared coated lithium-rich lithium-based lithium manganese iron phosphate material has the characteristic of high charge capacity. The positive electrode material, polyvinylidene fluoride (PVDF), conductive carbon ink and N-methyl pyrrolidone (NMP) are mixed into slurry, and the slurry is coated on an aluminum foil sheet to prepare the battery pole piece. And then 2032 is assembled, and the charging capacity is 176.8mAh/g when the battery is charged at 0.1C and detected by a Wuhan blue electric (LAND) charging and discharging machine, so that the initial charging capacity is improved by 16.4mAh/g compared with the capacity without coating the lithium-rich base, and the capacity is improved by about 10.22%.
Comparative example
And mixing the positive electrode material lithium iron phosphate, ternary material and lithium manganese iron phosphate with polyvinylidene fluoride (PVDF), conductive carbon ink and N-methyl pyrrolidone (NMP) respectively to form slurry, and coating the slurry on an aluminum foil sheet to obtain the battery pole piece. The assembly was then 2032 charged and tested in a Wuhan blue electric (LAND) charge-discharge machine with 0.1C charge, and the data obtained are shown in the following table:
the above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The lithium ion battery anode material coated by the lithium-rich lithium supplementing material is characterized by comprising the following components in percentage by weight:
the positive electrode active material can be at least one of lithium iron phosphate (LiFeMxPO 4,0.01< x < 0.1), lithium manganese iron phosphate (LiMnxFe 1-xPO4, 0.3.ltoreq.x.ltoreq.0.6), ternary (LiNiXCoYM 1-x-yO2, 0.1.ltoreq.x.ltoreq. 0.6,0.3.ltoreq.x+y.ltoreq.0.9, M=Mn, al);
the lithium-rich base material can be at least one of Li2NiMxO2 (x is more than or equal to 0.02 and less than or equal to 0.1) and Li5FeMxO4 (x is more than or equal to 0.01 and less than or equal to 0.1);
the composite conductive carbon tube solution can be at least one of a composite conductive carbon tube and an oxidized composite conductive carbon tube.
2. The lithium ion battery positive electrode material coated with the lithium-rich lithium-supplementing material according to claim 1, wherein the composite conductive carbon tube solution is prepared by mixing a composite conductive carbon tube with an oxidized composite conductive carbon tube: NMP material mass ratio 1: 50-100.
3. The lithium ion battery anode material coated with the lithium-rich lithium-supplementing material according to claim 2, wherein the composite conductive carbon tube is added in an amount of 0.1-1% by mass, and the mass ratio of the lithium-rich base material to the anode material in the final product is 1-10%.
4. A method for preparing a lithium-rich lithium-compensating material coated lithium-ion battery positive electrode material for implementing the lithium-rich lithium-compensating material coated lithium-ion battery positive electrode material of any one of claims 1-3, comprising the steps of:
step one: mixing the composite conductive carbon tube solution in pure water according to a proportion, adding all positive electrode active materials, and stirring and dispersing at a rotating speed of 8000-16000 rpm to form uniform and stable slurry;
step two: adding a lithium-rich base material into the slurry, and stirring and dispersing at the rotating speed of 4500-12500 r/min to form uniform and stable slurry;
step three: and granulating the slurry through pressurized fluid spray drying to form secondary agglomeration positive electrode material precursor particles with the particle size of D50=6-15 um, uniformly coating the surface of the positive electrode active material by the lithium-rich base material, and penetrating the composite conductive carbon tube into the positive electrode active material agglomerates in a three-dimensional conductive network mode.
5. The method for preparing the lithium ion battery anode material coated with the lithium-rich lithium supplementing material according to claim 4, wherein the method is characterized in that,
in the first step, the feeding amount of the composite conductive carbon tube accounts for 0.1-1% of the total mass ratio;
in the first step, the solid material accounts for 10-70% of the total material;
in the second step, the charging amount of the lithium-rich base material accounts for 1-5% of the mass ratio of the anode material.
6. The method for preparing a lithium ion battery anode material coated with a lithium-rich lithium-supplementing material according to claim 5, wherein in the first step, the time is controlled to be 0.5-2 h, and the viscosity is controlled to be 50-200 cps.
7. The method for preparing the lithium ion battery anode material coated with the lithium-rich lithium supplementing material according to claim 6, wherein in the second step, the time is controlled to be 2-6 h, and the viscosity is controlled to be 100-500 cps.
8. The method for preparing a lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material according to claim 7, wherein in the third step, the pressure fluid is controlled at 140-260 ℃ and the pressure is controlled at 0.2-1.0 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772022.5A CN117790725A (en) | 2023-12-21 | 2023-12-21 | Lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772022.5A CN117790725A (en) | 2023-12-21 | 2023-12-21 | Lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material and preparation method thereof |
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| CN117790725A true CN117790725A (en) | 2024-03-29 |
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| CN202311772022.5A Pending CN117790725A (en) | 2023-12-21 | 2023-12-21 | Lithium-rich lithium-supplementing material-coated lithium ion battery positive electrode material and preparation method thereof |
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