CN114883550A - MXene-coated ternary cathode material, preparation method thereof and lithium ion battery - Google Patents

MXene-coated ternary cathode material, preparation method thereof and lithium ion battery Download PDF

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CN114883550A
CN114883550A CN202210729961.0A CN202210729961A CN114883550A CN 114883550 A CN114883550 A CN 114883550A CN 202210729961 A CN202210729961 A CN 202210729961A CN 114883550 A CN114883550 A CN 114883550A
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mxene
ternary
positive electrode
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cathode material
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周永兵
谭小芳
王超
曾汉民
何巍
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Hubei Eve Power Co Ltd
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Abstract

The invention relates to an MXene-coated ternary cathode material, a preparation method thereof and a lithium ion battery, wherein the preparation method comprises the following steps: (1) MXene is prepared by an etching method; (2) mixing a ternary precursor and a lithium source, and carrying out primary calcination to obtain a ternary positive electrode primary calcined product; (3) and (3) mixing a dispersing agent, MXene obtained in the step (1) and the ternary positive electrode primary sintered product obtained in the step (2), and carrying out secondary calcination to obtain the MXene coated ternary positive electrode material. According to the preparation method of the MXene-coated ternary cathode material, the uniform conductive network coating layer is formed on the surface of the ternary cathode material, so that the side reaction of the ternary material and electrolyte can be effectively inhibited; the preparation process of the MXene coated ternary cathode material is optimized, and the problem of complex material preparation process is solved; the electronic conductivity and the ionic conductivity of the anode material are improved, and the rate capability and the cycle performance are further improved.

Description

MXene-coated ternary cathode material, preparation method thereof and lithium ion battery
Technical Field
The invention belongs to the technical field of preparation of lithium ion battery anode materials, relates to a preparation method of an MXene-coated ternary anode material, and particularly relates to an MXene-coated ternary anode material, a preparation method thereof and a lithium ion battery.
Background
The ternary cathode material has the outstanding advantages of high power density, energy density, excellent cycle performance and the like, is concerned about, and becomes one of the most widely applied cathode materials of the lithium ion secondary battery in industry. Researches find that high specific capacity can be obtained in the ternary cathode material along with the continuous increase of the content of nickel, but the material structure can generate defects at the same time, and the Ni has catalytic activity in a high charge state 4+ The interface side reaction between the anode material and the electrolyte is aggravated, the metal ion dissolution and surface oxygen release of the material are initiated, and then the conversion from a layered structure to a spinel or rock salt structure is generated, so that the capacity attenuation and the cycle stability of the anode material are reduced, and the service life of the lithium ion battery is reduced.
At present, in order to solve the above problems, the stability of the structure of the ternary positive electrode material is generally improved by coating the surface of the material with different compounds.
CN 112103504A provides a preparation method of a ternary material loaded few-layer/rod-shaped MXene composite material, which comprises the following steps: adding multilayer two-dimensional MXene powder with preset mass into an intercalating agent, uniformly stirring by magnetic force, performing centrifugal treatment after complete reaction, and taking a lower-layer precipitate; adding the lower-layer precipitate into a three-neck flask, pouring deionized water, performing ultrasonic treatment in a gas atmosphere for a preset time, performing centrifugal treatment, taking the upper-layer liquid, and performing freeze drying to obtain less-layer/rod-shaped MXene; mixing the less-layer/rod-shaped MXene with the ternary material to prepare electrode slurry, coating the electrode slurry on an aluminum foil, and performing vacuum drying to form the ternary material loaded less-layer/rod-shaped MXene composite material. The invention can inhibit M-H2 phase change under higher voltage and absorb Ni/Co/Mn atoms due to the addition of MXene, and can reduce the generation rate of metal dendrites, thereby enhancing and stabilizing the nickel-rich positive electrode structure and keeping excellent multiplying power and cycle performance.
CN 112164791A discloses a preparation method of a novel MXene coated nickel-cobalt-manganese ternary cathode material, wherein MXene dispersion liquid is prepared firstly, MAX phase is used as a raw material for preparing MXene, an acid etching method is used for preparing organ-shaped MXene, the organ-shaped MXene is prepared into MXene monolithic dispersion liquid by means of ultrasonic stripping, and the prepared MXene dispersion liquid is enabled to be negatively charged on the basis of oxygen-containing functional groups on the surface of the MXene dispersion liquid. The positive charge is carried on the surface of the ternary positive electrode material by treating the nickel-cobalt-manganese ternary positive electrode material with a cationic surfactant, and the MXene lamella is coated on the surface of the nickel-cobalt-manganese ternary positive electrode material by electrostatic adsorption self-assembly. The MXene coating layer effectively isolates the direct contact of the ternary cathode material and the electrolyte, and the occurrence of direct contact side reaction is effectively avoided. The preparation method is simple, short in flow, easy to operate in steps, excellent in material processing performance and electrochemical performance, capable of reducing the impedance of the battery and improving the high rate performance and the cycle stability of the material.
In the technical scheme, the ternary cathode material is coated and modified, but MXene is directly mixed with the ternary material by CN 112103504A to prepare the composite material, so that the composite effect is possibly poor, which is mainly reflected in that the combination effect of the MXene and the ternary material is possibly poor, and the MXene is easily separated from the ternary material main body. The structural stability of the ternary cathode material may be affected by the repeated use of CN 112164791A through centrifugation and water washing, the cost is increased by adding the water washing procedure, and the freeze drying method is not beneficial to industrial mass preparation.
Therefore, how to optimize and improve the preparation process of the material and provide the MXene coated and modified ternary cathode material is a problem to be solved in the technical field of lithium ion battery cathode material preparation.
Disclosure of Invention
In order to solve the technical problems, the invention provides an MXene-coated ternary cathode material, a preparation method thereof and a lithium ion battery, the preparation process of the MXene-coated ternary cathode material is optimized, the problem of complex material preparation process is solved, and the electrochemical properties of the ternary cathode material, such as rate performance, high-temperature circulation, high-temperature storage and the like, are obviously improved compared with the uncoated ternary cathode material.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a preparation method of an MXene coated ternary cathode material comprises the following steps:
(1) MXene is prepared by an etching method;
(2) mixing a ternary precursor and a lithium source, and carrying out primary calcination to obtain a ternary positive electrode primary calcined product;
(3) and (3) mixing a dispersing agent, MXene obtained in the step (1) and the ternary positive electrode primary sintered product obtained in the step (2), and carrying out secondary calcination to obtain the MXene coated ternary positive electrode material.
According to the preparation method of the MXene-coated ternary cathode material, the uniform conductive network coating layer is formed on the surface of the ternary cathode material, so that the side reaction of the ternary material and electrolyte can be effectively inhibited; the preparation process of the MXene coated ternary cathode material is optimized, and the problem of complex material preparation process is solved; the electronic conductivity and the ionic conductivity of the ternary cathode material are improved, and further the electrochemical properties such as multiplying power property, cycle performance and the like are improved.
Preferably, the etching method in step (1) comprises:
and mixing MAX and etching mixed liquid, and stirring for reaction to obtain the MXene.
Preferably, the MAX has the chemical formula M n+1 AX n Wherein n is 1, 2 or 3, A comprises any one or a combination of at least two of Al, Ga, In, Ti, Si, Ge, Sn or Pb, typical but not limiting combinations include Al and Ga, Ga and In, In and Ti, Ti and Si, Si and Ge, Ge and Sn, Sn and Pb, Al, Ga and In, Ga, and Pb,In and Ti combination, In, Ti and Si combination, Ti, Si and Ge combination, Si, Ge and Sn combination, Ge, Sn and Pb combination, Al, Ga, In and Ti combination, Ga, In, Ti and Si combination, In, Ti, Si and Ge combination, Ti, Si, Ge and Sn combination, Si, Ge, Sn and Pb combination, preferably Ti 3 AlC 2 。
Preferably, the etching mixture includes a mixture solution of a lithium source and an acid.
Preferably, the lithium source comprises LiF.
Preferably, the concentration of the lithium source is 2 to 5mol/L, for example, 2mol/L, 2.5mol/L, 3mol/L, 4mol/L or 5mol/L, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the acid comprises HCl.
Preferably, the acid is present in a mass fraction of 10 to 50 wt.%, for example 10 wt.%, 20 wt.%, 30 wt.%, 40 wt.% or 50 wt.%, but not limited to the recited values, and other values not recited within the range of values are equally applicable.
Preferably, the reaction time is 0.5 to 5 hours, for example, 0.5 hour, 1 hour, 3 hours, 4 hours or 5 hours, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, MXene in the step (1) has a chemical formula of M n+1 X n Wherein N is 1, 2 or 3, M is any one or combination of at least two of Ti, V, Sr, Cr, Ta, Nb, Zr, Mo or Hf, and X is C and/or N.
M is any one or a combination of at least two of Ti, V, Sr, Cr, Ta, Nb, Zr, Mo, or Hf, and typical but non-limiting combinations include combinations of Ti and V, V and Sr, Sr and Cr, Cr and Ta, Ta and Nb, Nb and Zr, Zr and Mo, Mo and Hf, Ti, V and Sr, V, Sr and Cr, Sr, Cr and Ta, Nb and Zr, Nb, Zr and Mo, Zr, Mo and Hf, Ti, V, Sr and Cr, V, Cr and Ta, Sr, Ta, Nb and Zr, Ta, Nb, Zr, Mo and Mo, Nb, Zr, and Hf.
The method for preparing the Mxene by the etching method optimizes and adjusts the concentration and the reaction time of the etching mixed liquid on the basis of the prior art.
Preferably, the ternary precursor of step (2) comprises a ternary precursor of Nickel Cobalt Manganese (NCM) and/or Nickel Cobalt Aluminium (NCA).
Preferably, the material proportion of Ni in the ternary precursor in step (2) includes any one of Ni33, Ni50, Ni60, Ni70, Ni80, Ni90 or Ni 99.
In the present invention, Ni33 means that the molar content of Ni in the ternary precursor is 33% in terms of molar content, Ni50, Ni60, Ni70, Ni80, Ni90, and Ni99, and so on.
Preferably, the time of the primary calcination in the step (2) is 5 to 16 hours, such as 5 hours, 7 hours, 9 hours, 10 hours, 12 hours, 14 hours or 16 hours, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the temperature of the primary calcination in step (2) is 650 to 1100 ℃, for example 650 ℃, 800 ℃, 900 ℃, 1000 ℃ or 1100 ℃, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the atmosphere of the primary calcination in the step (2) is oxygen and/or air.
Preferably, the mass ratio of MXene to ternary positive electrode calcined product in the step (3) is 1 (5-200), and the mass ratio can be 1:5, 1:8, 1:10, 1:15, 1:20, 1:50, 1:100, 1:150 or 1:200, but is not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.
Preferably, the dispersant of step (3) comprises water and/or NMP.
Preferably, after mixing MXene obtained in step (1) and the ternary cathode calcined product dispersing agent obtained in step (2) in step (3), the liquid-solid ratio is 100-500 mL/g, for example, 100mL/g, 200mL/g, 300mL/g, 400mL/g or 500mL/g, but not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the temperature of the secondary calcination in step (3) is 150 to 850 ℃, for example, 150 ℃, 250 ℃, 350 ℃, 550 ℃, 580 ℃, 600 ℃, 720 ℃, 750 ℃ or 850 ℃, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the time of the secondary calcination in step (3) is 2-13 h, for example, 2h, 5h, 6h, 7h, 8h, 9h, 10h or 13h, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the atmosphere of the secondary calcination in the step (3) is oxygen and/or air.
As a preferable technical solution of the preparation method of the first aspect of the present invention, the preparation method comprises the steps of:
(1) mixing MAX and LiF/HCl mixed liquor, wherein the concentration of HCl is 10-50 wt%, and stirring for reacting for 0.5-5 h to obtain MXene;
the chemical formula of MXene is M n+1 X n Wherein N is 1, 2 or 3, M is any one or combination of at least two of Ti, V, Sr, Cr, Ta, Nb, Zr, Mo or Hf, and X is C and/or N;
(2) mixing a ternary precursor and a lithium source, and calcining for 5-16 h at 650-1100 ℃ in the atmosphere of any one or combination of at least two of oxygen, air or compressed gas to obtain a ternary positive electrode primary calcined product;
the material proportion of Ni in the ternary precursor comprises any one of Ni33, Ni50, Ni60, Ni70, Ni80, Ni90 or Ni 99;
(3) and (2) mixing water and/or NMP, MXene obtained in the step (1) and the ternary positive electrode calcined product obtained in the step (2), wherein the mass ratio of the MXene to the ternary positive electrode calcined product is 1 (5-200), the mixed liquid-solid ratio is 100-500 mL/g, and secondary calcination is carried out at the temperature of 150-850 ℃ for 2-13 h to obtain the MXene coated ternary positive electrode material.
In a second aspect, the invention provides an MXene-coated ternary cathode material, which is obtained by the preparation method of the first aspect.
In a third aspect, the invention provides a lithium ion battery, wherein the lithium ion battery contains the modified ternary cathode material according to the first aspect.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the preparation method of the MXene-coated ternary cathode material, the uniform conductive network coating layer is formed on the surface of the ternary cathode material, so that the side reaction of the ternary material and electrolyte can be effectively inhibited; the preparation process of the MXene coated ternary cathode material is optimized, and the problem of complex material preparation process is solved; the electronic conductivity and the ionic conductivity of the ternary cathode material are improved, and further the electrochemical properties such as multiplying power property, cycle performance and the like are improved.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a preparation method of an MXene coated ternary cathode material, and the preparation method comprises the following steps:
(1) mixed Ti 3 AlC 2 And LiF/HCl mixed solution, wherein the mass fraction of HCl is 20 wt%, the concentration of LiF is 2.5mol/L, and the Ti is obtained after stirring reaction for 2.5 hours 3 C 2 ；
(2) Mixed NCM811 (chemical formula Ni) 0.8 Co 0.1 Mn 0.1 (OH) 2 ) Calcining the precursor and lithium hydroxide for 12 hours at 850 ℃ in an oxygen atmosphere to obtain a ternary positive electrode calcined product;
(3) mixing water and Ti obtained in step (1) 3 C 2 And (3) obtaining the ternary positive electrode calcined product obtained in the step (2), wherein the mass ratio of MXene to the ternary positive electrode calcined product is 1:100, the mixed liquid-solid ratio is 250mL/g, and secondary calcination is carried out at the temperature of 500 ℃ for 8h to obtain the MXene-coated ternary positive electrode material.
Example 2
The embodiment provides a preparation method of an MXene coated ternary cathode material, and the preparation method comprises the following steps:
(1) mixed Ta 4 GaC 3 And LiF/HCl mixed solution, wherein the mass fraction of HCl is 25 wt%, the concentration of LiF is 5mol/L, and the stirring reaction is carried out for 0.5h to obtain Ta 4 C 3 ；
(2) Mixing an NCM811 precursor and lithium carbonate, and calcining for 15 hours at 900 ℃ in an air atmosphere to obtain a ternary positive electrode primary calcined product;
(3) mixing NMP and Ta obtained in step (1) 4 C 3 And (3) carrying out secondary calcination at 150 ℃ for 13h in an oxygen atmosphere to obtain the MXene coated ternary positive electrode material, wherein the mass ratio of MXene to the ternary positive electrode calcined product obtained in the step (2) is 1:5, and the liquid-solid ratio after mixing is 100 mL/g.
Example 3
The embodiment provides a preparation method of an MXene coated ternary cathode material, and the preparation method comprises the following steps:
(1) mixing (V) 0.5 Cr 0.5 ) 3 AlC 2 And LiF/HCl mixed solution, wherein the mass fraction of HCl is 10 wt%, the concentration of LiF is 2mol/L, and the mixture is stirred to react for 5 hours to obtain (V) 0.5 Cr 0.5 ) 3 C 2 ；
(2) Mixing an NCM811 precursor and lithium carbonate, and calcining for 7 hours at the temperature of 1100 ℃ to obtain a ternary positive electrode primary calcined product;
(3) mixing water and (V) obtained in step (1) 0.5 Cr 0.5 ) 3 C 2 And (3) obtaining the ternary positive electrode calcined product obtained in the step (2), wherein the mass ratio of MXene to the ternary positive electrode calcined product is 1:200, the mixed liquid-solid ratio is 500mL/g, and secondary calcination is carried out at the temperature of 850 ℃ for 2h in an air atmosphere to obtain the MXene-coated ternary positive electrode material.
Example 4
This embodiment provides a method for preparing an MXene-coated ternary cathode material, in which a ternary precursor is replaced with NCM622 (chemical formula is Ni) 0.6 Co 0.2 Mn 0.2 (OH) 2 ) Otherwise, the remaining process steps are the same as in example 1.
Example 5
This embodiment provides a method for preparing an MXene-coated ternary positive electrode material, in which a ternary precursor is replaced with NCA (chemical formula is Ni) 0.8 Co 0.1 Al 0.1 (OH) 2 ) Otherwise, the remaining process steps are the same as in example 1.
Example 6
This example provides a method for preparing an MXene-coated ternary cathode material, which includes the same process steps as in example 1, except that the temperature of the primary calcination in step (2) is 1200 ℃.
Example 7
This example provides a method for preparing an MXene-coated ternary cathode material, which comprises the same process steps as in example 1, except that the temperature of the primary calcination in step (2) is 600 ℃.
Example 8
This example provides a method for preparing an MXene-coated ternary cathode material, which comprises the same process steps as in example 1, except that the time for primary calcination in step (2) is 3 hours.
Example 9
This example provides a method for preparing an MXene-coated ternary cathode material, which comprises the same process steps as in example 1, except that the time for primary calcination in step (2) is 18 hours.
Example 10
This example provides a method for preparing an MXene-coated ternary cathode material, which is the same as example 1 except that the temperature of the secondary calcination in step (3) is 900 ℃.
Example 11
This example provides a method for preparing an MXene-coated ternary cathode material, which is the same as example 1 except that the temperature of the secondary calcination in step (3) is 100 ℃.
Example 12
This example provides a method for preparing an MXene-coated ternary cathode material, which includes the same process steps as in example 1, except that the time for the second calcination in step (3) is 1 h.
Example 13
This example provides a method for preparing an MXene-coated ternary cathode material, which comprises the same process steps as example 1, except that the time for the second calcination in step (3) is 14 h.
Example 14
This example provides a method for preparing MXene-coated ternary cathode material, except Ti 3 AlC 2 The mass ratio of the ternary positive electrode and the ternary positive electrode calcined product is 1:4, and the rest process steps are the same as those in the embodiment 1.
Example 15
This example provides a method for preparing MXene-coated ternary cathode material, except Ti 3 AlC 2 The mass ratio of the ternary positive electrode and the calcined product is 1:220, and the rest process steps are the same as those of the example 1.
Comparative example 1
The present comparative example provides a method of preparing a ternary cathode material, the method comprising:
and mixing the ternary precursor of NCM811 with lithium sulfate, and calcining at 800 ℃ for 12h in an oxygen atmosphere to obtain the ternary cathode material.
And assembling the MXene-coated ternary cathode material into a soft package battery according to GB 31241-2014, and carrying out an electrochemical performance test.
The test method comprises the following steps: carrying out specific capacity test under the conditions of 0.2C and 4.25V; testing the rate performance under the condition of 3C/0.2C; the charge/discharge test cycle performance was performed at 45 ℃ at 1C/1C.
The results of the boost data for each test are shown in tables 1 and 2.
TABLE 1
Figure BDA0003712815690000101
Figure BDA0003712815690000111
TABLE 2
Figure BDA0003712815690000112
Figure BDA0003712815690000121
From the data in tables 1 and 2, the following conclusions can be drawn:
(1) from examples 1 to 5, the preparation method of the MXene-coated ternary cathode material provided by the invention has the advantages that a uniform conductive network coating layer is formed on the surface of the ternary cathode material, so that the side reaction of the ternary material and an electrolyte can be effectively inhibited; the electronic conductivity and the ionic conductivity of the anode material are improved, and the rate capability and the cycle performance are further improved.
(2) As can be seen from the comparison between examples 6 to 13 and example 1, when the temperature or time of the primary calcination is not within the preferred range of the present invention, the calcination effect is not ideal, which affects the tap density of the ternary positive electrode calcined product, or causes the poor crystallization property of the ternary positive electrode calcined product, thereby reducing the electrochemical performance and further being not beneficial to the improvement of the electrochemical performance of the MXene-coated ternary positive electrode material; when the temperature or time of the secondary calcination is not in the preferable range of the invention, the coating effect of MXene is affected, and the MXene is easy to be separated from the ternary cathode main body, which is further not beneficial to the improvement of the electrochemical performance of the ternary material by the MXene-coated ternary cathode material.
(3) It can be seen from the comparison between examples 14 and 15 and example 1 that when the mass ratio of MXene to the ternary positive electrode calcined product is not within the preferred range of the present invention, too little MXene cannot form a conductive network coating layer on the surface of the ternary material, the coating effect is not ideal, and too much MXene tends to deposit on the surface of the ternary material, thereby reducing the conductivity, and failing to achieve the effect of improving the electrochemical performance of the MXene-coated ternary positive electrode material.
In conclusion, the preparation method of the MXene-coated ternary cathode material provided by the invention is simple and beneficial to industrial mass production, and the uniform MXene conductive network coating layer is formed on the surface of the ternary cathode material, so that the side reaction of the ternary material and an electrolyte can be effectively inhibited, the electronic conductivity and the ionic conductivity of the cathode material are improved, and the rate capability and the cycle performance are further improved.
The present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed process flow, i.e. it is not meant to imply that the present invention must rely on the above detailed process flow to be practiced. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. The preparation method of the MXene-coated ternary cathode material is characterized by comprising the following steps of:
(1) MXene is prepared by an etching method;
(2) mixing a ternary precursor and a lithium source, and carrying out primary calcination to obtain a ternary positive electrode primary calcined product;
(3) and (3) mixing a dispersing agent, MXene obtained in the step (1) and the ternary positive electrode primary sintered product obtained in the step (2), and carrying out secondary calcination to obtain the MXene coated ternary positive electrode material.
2. The production method according to claim 1, wherein the etching method of step (1) includes:
mixing MAX and etching mixed liquor, and stirring for reaction to obtain MXene;
preferably, the MAX has the chemical formula M n+1 AX n Wherein n is 1, 2 or 3, and a comprises any one or a combination of at least two of Al, Ga, In, Ti, Si, Ge, Sn or Pb.
3. The method according to claim 2, wherein the etching mixture comprises a mixture solution of a lithium source and an acid;
preferably, the lithium source comprises LiF;
preferably, the acid comprises HCl;
preferably, the mass fraction of the acid is 10 to 50 wt%.
4. The method according to any one of claims 1 to 3, wherein the reaction time is 0.5 to 5 hours.
5. The method according to any one of claims 1 to 4, wherein the MXene of step (1) has a chemical formula of M n+1 X n Wherein N is 1, 2 or 3, M is any one or combination of at least two of Ti, V, Sr, Cr, Ta, Nb, Zr, Mo or Hf, and X is C and/or N.
6. The production method according to any one of claims 1 to 5, characterized in that the ternary precursor in step (2) comprises a ternary precursor of NCM and/or NCA;
preferably, the material proportion of Ni in the ternary precursor in the step (2) comprises any one of Ni33, Ni50, Ni60, Ni70, Ni80, Ni90 or Ni 99;
preferably, the time of the primary calcination in the step (2) is 5-16 h;
preferably, the temperature of the primary calcination in the step (2) is 650-1100 ℃;
preferably, the atmosphere of the primary calcination in the step (2) is oxygen and/or air.
7. The preparation method according to any one of claims 1 to 6, wherein the mass ratio of MXene to ternary positive electrode calcined product in the step (3) is 1 (5-200);
preferably, the dispersant of step (3) comprises water and/or NMP;
preferably, the liquid-solid ratio after mixing in the step (3) is 100-500 mL/g;
preferably, the temperature of the secondary calcination in the step (3) is 150-850 ℃;
preferably, the time of the secondary calcination in the step (3) is 2-13 h;
preferably, the atmosphere of the secondary calcination in the step (3) is oxygen and/or air.
8. The production method according to any one of claims 1 to 7, characterized by comprising the steps of:
(1) mixing MAX and LiF/HCl mixed liquor, wherein the concentration of HCl is 10-50 wt%, and stirring for reacting for 0.5-5 h to obtain MXene;
the chemical formula of MXene is M n+1 X n Wherein N is 1, 2 or 3, M is any one or combination of at least two of Ti, V, Sr, Cr, Ta, Nb, Zr, Mo or Hf, and X is C and/or N;
(2) mixing a ternary precursor and a lithium source, and calcining for 5-16 h at 650-1100 ℃ in the atmosphere of any one or combination of at least two of oxygen, air or compressed gas to obtain a ternary positive electrode primary calcined product;
the material proportion of Ni in the ternary precursor comprises any one of Ni33, Ni50, Ni60, Ni70, Ni80, Ni90 or Ni 99;
(3) and (2) mixing water and/or NMP, MXene obtained in the step (1) and the ternary positive electrode calcined product obtained in the step (2), wherein the mass ratio of the MXene to the ternary positive electrode calcined product is 1 (5-200), the mixed liquid-solid ratio is 100-500 mL/g, and secondary calcination is carried out at the temperature of 150-850 ℃ for 2-13 h to obtain the MXene coated ternary positive electrode material.
9. An MXene-coated ternary cathode material, which is obtained by the preparation method of any one of claims 1 to 8.
10. A lithium ion battery comprising the modified ternary positive electrode material according to claim 9.
CN202210729961.0A 2022-06-24 2022-06-24 MXene-coated ternary cathode material, preparation method thereof and lithium ion battery Pending CN114883550A (en)

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