A composite high-voltage ternary cathode material, its preparation method and application

Abstract

The present invention discloses a composite high-voltage ternary positive electrode material and a preparation method and application thereof. The chemical formula of the composite high-voltage ternary positive electrode material is LiNi 1‑x‑y Co x Mn y Nb a O2@mCe 0.8 Dy 0.2 O 1.9 ·nLi8CeO6·pLiNbO3 / Li3NbO4, wherein x<0.3, y<0.3, 0.7≤1‑x‑y≤0.9. The composite high-voltage ternary cathode material is a ternary cathode material doped with niobium and synergistically coated with an oxygen ion conductor and a fast ion conductor. The high-voltage cycle stability of the ternary cathode material can be improved by the composite of coating and doping, and the modified ternary cathode material does not change the original single crystal morphology of the material and will not affect the morphology and particle size of the material.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium secondary batteries, and specifically relates to a doped and coated composite high-voltage ternary cathode material and a preparation method thereof, and also relates to the application of the composite high-voltage ternary cathode material in lithium-ion batteries. Background Art

[0002] Lithium-ion batteries are widely used in fields such as microelectronic devices and electric vehicles due to their excellent energy storage characteristics. According to the energy density formula: Energy = QU, it can be known that increasing the voltage U can increase the energy density, thereby improving the cruising range of new energy vehicles. After the voltage is increased, more lithium ions can be extracted, thereby achieving higher specific capacity and average discharge voltage. According to relevant research, when the charging voltage of NCM551530 increases from 4.2V to 4.6V, the specific capacity increases from 158.4 mAh / g to 207.2 mAh / g, and the energy density of the cathode material increases from 605.2 Wh / kg to 816.4 Wh / kg. At the same time, the specific capacity and energy density of NCM622 at a charging cut-off voltage of 4.5V are basically equivalent to those of NCM811 at 4.3V. At the same energy density, the high-voltage technology has lower cost and higher safety than high-nickel. However, high voltage is likely to cause macroscopic battery failure behaviors such as short battery cycle life, low thermal stability, and electrolyte consumption.

[0003] In order to overcome the inherent instability of nickel-rich ternary cathode materials at high voltages, currently, domestic and foreign research mainly focuses on improving the preparation method of ternary cathode materials and doping and coating modification, etc., which can enhance the structural stability of the materials to a certain extent. The Chinese patent with the patent number CN202210892129.2 realizes good cycle performance and high safety performance by coating a mixed polyaniline and polyurethane flexible coating on the surface of the cathode material. However, this method has a complex process and is not environmentally friendly. The Chinese patent with the patent number CN202110416541.2 obtained a high-voltage LiNi x Co y Mn z Na a BbO2@mAl2O3 ternary cathode material, increased the voltage to 4.6 volts, with stable high-voltage cycle performance and an initial charge-discharge specific capacity of 184 mAh / g; however, this material is doped with boron and is prone to gas generation during high-voltage cycling, resulting in battery failure. Summary of the Invention

[0004] In view of this, it is necessary for the present invention to provide a composite high-voltage ternary cathode material, namely a composite high-voltage ternary cathode material with synergistic coating of niobium-doped oxygen ion conductor and fast ion conductor, which improves the high-voltage cycle stability of the cathode material.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention first provides a composite high-voltage ternary positive electrode material, the chemical formula of the composite high-voltage ternary positive electrode material is LiNi 1-x-y Co x Mn y Nb a O2@mCe 0.8 Dy 0.2 O 1.9 ·nLi8CeO6·pLiNbO3 / Li3NbO4, wherein x<0.3, y<0.3, 0.7≤1-xy≤0.9; in addition, in the chemical formula, 0<a<1000ppm, 0<m<2000ppm, 0<n<2000ppm, 0<p<2000ppm. The composite high-voltage ternary positive electrode material is a positive electrode material doped with niobium in combination with an oxygen ion conductor and a fast ion conductor, and the high-voltage cycle stability of the ternary positive electrode material can be improved by the composite of coating and doping.

[0007] The present invention further provides a method for preparing the composite high-voltage ternary positive electrode material as claimed in claim 1, comprising the following steps:

[0008] Mixing dysprosium salt, cerium salt, niobium salt and water to obtain a mixed solution; adding a ternary cathode material precursor to the mixed solution, mixing, and then drying to obtain a precursor;

[0009] The precursor is fully mixed with a lithium source, ground, and calcined to obtain a composite high-voltage ternary positive electrode material;

[0010] In a further scheme, the ratio or amount of each component in the preparation method can be adjusted according to specific needs to achieve the adjustment of the final positive electrode material composition. In some typical embodiments of the present invention, in the mixed solution, the total mass concentration of dysprosium salt, cerium salt and niobium salt is between 30% and 50%; the ratio of the ternary positive electrode material precursor to the metal salt in the mixed solution is 1wt%-3wt%.

[0011] In a further embodiment, the dysprosium salt, cerium salt and niobium salt described in this article can all be conventional soluble metal salts in the art. Specific examples include: the dysprosium salt is selected from at least one of dysprosium nitrate hexahydrate and dysprosium sulfate; and / or, the cerium salt is selected from at least one of cerium nitrate hexahydrate and cerium sulfate; and / or, the niobium salt is niobium nitrate hexahydrate.

[0012] In a further embodiment, the ternary cathode material precursor described in this article is a conventional commercial nickel-cobalt-manganese ternary precursor, and its chemical formula is Ni (1-x-y) Cox Mn y (OH)₂, where 0.5 ≤ 1 - x - y ≤ 0.8, x < 0.3, and y < 0.3.

[0013] In a further aspect, the lithium source described herein is not particularly limited and can be a conventional choice in the art. For example, the lithium source can be selected from at least one of lithium carbonate and lithium hydroxide; the specific ratio can be adjusted according to actual needs. In some typical embodiments of the present invention, the lithium source and the precursor are mixed at a molar ratio of Li / (Ni + Co + Mn) of (1.01 - 1.07):1.

[0014] In a further aspect, the drying described herein is not particularly limited and can be selected from at least one of vacuum drying and freeze drying.

[0015] In a further aspect, the calcination preferably adopts staged calcination, specifically: in the first stage, it is heated to 450 - 550°C at a rate of 3 - 5°C / min and held for 4 - 6 h, and in the second stage, it is heated to 700 - 950°C at a rate of 3 - 5°C / min and held for 8 - 24 h. During the calcination process, a holding platform at 450 - 550°C is designed to facilitate the uniform nucleation of crystals, resulting in better uniformity of the finished product morphology.

[0016] The present invention further provides the use of the composite high-voltage ternary cathode material as described above or the composite high-voltage ternary cathode material prepared by the preparation method as described above in the preparation of lithium-ion batteries.

[0017] The present invention further provides a lithium-ion battery, which includes a positive electrode, and the active material of the positive electrode includes the composite high-voltage ternary cathode material as described above or the composite high-voltage ternary cathode material prepared by the preparation method as described above.

[0018] The present invention has the following beneficial effects:

[0019] The composite high-voltage ternary cathode material has a single-crystal morphology, and the oxygen ion conductor Ce 0.8 Dy 0.2 O 1.9 coating layer suppresses the activated surface lattice oxygen ions through its stable oxygen vacancies, and the fast ion conductors Li₈CeO₆&LiNbO₃ / Li₃NbO₄ synergistically strengthen the Li diffusion path through the cathode-electrolyte interface phase; in addition, part of Nb diffuses into the bulk phase and replaces part of Ni 2+ , reducing the mixing of lithium and nickel. Due to the above effects, the high-voltage cycle stability of the ternary cathode material is improved.

[0020] In addition, the oxygen ion conductor Ce 0.8 Dy 0.2 O1.9 The ternary cathode material obtained by co-modifying with the fast ion conductor Li8CeO6&LiNbO3 / Li3NbO4 does not change the original single crystal morphology of the material, indicating that the coating doping modification in the present invention will not affect the morphology and particle size of the material, but can greatly improve its cycle stability at high voltages. Description of the Drawings

[0021] Figure 1 SEM image of the composite high-voltage ternary cathode material prepared in Example 2 of the present invention;

[0022] Figure 2 First charge-discharge curve of the composite high-voltage ternary cathode material prepared in Example 2 of the present invention, test voltage 2.8 - 4.55V;

[0023] Figure 3 Cycling performance graph of the coin cell assembled with the composite high-voltage ternary cathode material prepared in Example 2 of the present invention at a rate of 0.2C, test voltage 2.8 - 4.55V. Detailed Description of the Invention

[0024] The embodiments of the present invention will be described in detail below. The following described embodiments are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Additionally, unless otherwise specified, the methods without specific conditions or steps recorded are conventional methods, and the reagents and materials used can be obtained from commercial sources.

[0026] Example 1

[0027] The preparation process of the composite high-voltage ternary cathode material in this example is as follows:

[0028] Wet mixing: 0.3 wt% Ce2(SO4)3, 0.3 wt% Dy2(SO4)3 and 0.3 wt% NbO(NO3)3 are added to deionized water and stirred thoroughly to make them evenly mixed; then 3 μm of Ni 0.6 Co 0.1 Mn 0.3 (OH)2 cathode material precursor (produced by Kelong New Energy Co., Ltd.) is poured into the mixed solution and stirred thoroughly to obtain a mixed solution, and the mixed solution is dried in vacuum at 80°C for 10 h to obtain a sediment, that is, the precursor;

[0029] Preparation of the positive electrode material: 10 g of the above-obtained precursor powder and 3.96 g of lithium hydroxide were fully mixed and ground to obtain a mixed powder, which was heated to 450 °C and held for 6 h, and then continuously heated to 890 °C and held for 12 h to obtain a composite high-voltage ternary positive electrode material, the composition of which is LiNi 0.6 Co 0.1 Mn 0.3 Nb 0.1 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6·0.2LiNbO3 / Li3NbO4;

[0030] Preparation of the finished product: The composite high-voltage ternary positive electrode material was crushed, classified, and sieved as needed.

[0031] Example 2

[0032] In this example, the preparation process of the composite high-voltage ternary positive electrode material is as follows:

[0033] Wet mixing: 0.3 wt% Ce(NO3)3·6H2O, 0.3 wt% Dy(NO3)3·6H2O, and 0.3 wt% NbO(NO3)3 were added to deionized water and stirred well to make them evenly mixed; subsequently, 3 μm of Ni 0.6 Co 0.1 Mn 0.3 (OH)2 positive electrode material precursor (produced by Kelong New Energy Co., Ltd.) was poured into the mixed solution and stirred well to obtain a mixed solution, and the mixed solution was dried in vacuum at 80 °C for 10 h to obtain a sediment, that is, the precursor;

[0034] Preparation of the positive electrode material: 10 g of the above-obtained precursor powder and 3.318 g of lithium carbonate were fully mixed and ground to obtain a mixed powder, which was heated to 450 °C and held for 4 h, and then continuously heated to 850 °C and held for 12 h to obtain a composite high-voltage ternary positive electrode material, the composition of which is LiNi 0.6 Co 0.1 Mn 0.3 Nb 0.2 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6·0.1LiNbO3 / Li3NbO4;

[0035] Preparation of the finished product: The composite high-voltage ternary positive electrode material was crushed, classified, and sieved as needed.

[0036] Example 3

[0037] The preparation process of the composite high voltage ternary positive electrode material in this embodiment is as follows:

[0038] Wet mixing: 0.3wt% Ce(NO3)3·6H2O, 0.3wt% Dy(NO3)3·6H2O and 0.3wt% NbO(NO3)3 were added to deionized water and stirred thoroughly to mix them evenly; then 3μm Ni 0.6 Co 0.1 Mn 0.3 (OH)2 cathode material precursor (produced by Cologne New Energy Company) was poured into the mixed solution and stirred thoroughly to obtain a mixed solution, and the mixed solution was dried under vacuum at 80°C for 10 h to obtain a precursor precipitate;

[0039] Preparation of positive electrode material: 10g of the above-obtained precursor powder and 3.318g of lithium carbonate were fully mixed and ground to obtain a mixed powder, which was heated to 450°C for 5h, and then continued to be heated to 920°C for 12h to obtain a composite high-voltage ternary positive electrode material, whose composition is LiNi 0.6 Co 0.1 Mn 0.3 Nb 0.3 O2@0.3Ce 0.8 Dy 0.2 O 1.9 0.3Li8CeO6;

[0040] Finished product preparation: crush, grade and sieve the composite high-voltage ternary positive electrode material as needed.

[0041] Example 4

[0042] The preparation process of the composite high voltage ternary positive electrode material in this embodiment is as follows:

[0043] Wet mixing: 0.3wt% Ce(NO3)3·6H2O, 0.3wt% Dy(NO3)3·6H2O and 0.3wt% NbO(NO3)3 were added to deionized water and stirred thoroughly to mix them evenly; then 3μm Ni 0.8 Co 0.1 Mn 0.1 (OH)2 cathode material precursor (produced by Cologne New Energy Company) was poured into the mixed solution and stirred thoroughly to obtain a mixed solution, and the mixed solution was dried under vacuum at 80°C for 10 h to obtain a precursor precipitate;

[0044] Preparation of positive electrode material: 10g of the above-obtained precursor powder and 3.318g of lithium carbonate were fully mixed and ground to obtain a mixed powder, which was heated to 450°C for 5h and then continued to be heated to 850°C for 12h to obtain a composite high-voltage ternary positive electrode material, whose composition is LiNi 0.8 Co0.1 Mn 0.1 Nb 0.3 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6;

[0045] Finished product preparation: Crush, classify, and screen the composite high-voltage ternary cathode material as needed.

[0046] Example 5

[0047] In this example, the preparation process of the composite high-voltage ternary cathode material is as follows:

[0048] Wet mixing: 0.3 wt% Ce(NO3)3·6H2O, 0.3 wt% Dy(NO3)3·6H2O, and 0.3 wt% NbO(NO3)3 are added to deionized water and stirred well to make them evenly mixed; then 3 μm of Ni 0.5 Co 0.2 Mn 0.3 (OH)2 cathode material precursor (produced by Kelong New Energy Co., Ltd.) is poured into the mixed solution and stirred well to obtain a mixed solution, and the mixed solution is vacuum dried at 80 °C for 10 h to obtain a precursor sediment;

[0049] Cathode material preparation: 10 g of the obtained precursor powder and 3.318 g of lithium carbonate are fully mixed and ground to obtain a mixed powder, heated to 450 °C and held for 5 h, and then continued to be heated to 950 °C and held for 12 h to prepare a composite high-voltage ternary cathode material, whose composition is LiNi 0.5 Co 0.2 Mn 0.3 Nb 0.3 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6;

[0050] Finished product preparation: Crush, classify, and screen the composite high-voltage ternary cathode material as needed.

[0051] Comparative Example 1

[0052] Cathode material preparation: 10 g of 3 μm of Ni 0.6 Co 0.1 Mn 0.3 (OH)2 cathode material precursor (produced by Kelong New Energy Co., Ltd.) is fully mixed and ground with 3.318 g of lithium carbonate to obtain a mixed powder, heated to 450 °C and held for 4 h, and then continued to be heated to 850 °C and held for 12 h to prepare a ternary cathode material, whose composition is LiNi 0.6 Co0.1 Mn 0.3 O2;

[0053] Finished product preparation: crush, grade and sieve the ternary positive electrode material as required.

[0054] Comparative Example 2

[0055] The preparation process of the composite high voltage ternary positive electrode material in this comparative example is as follows:

[0056] Wet mixing: 0.3 wt% Ce(NO3)3·6H2O and 0.3 wt% NbO(NO3)3 were added to deionized water and stirred thoroughly to mix them evenly. Then, 3 μm Ni 0.6 Co 0.1 Mn 0.3 (OH)2 cathode material precursor (produced by Cologne New Energy Company) was poured into the mixed solution and stirred thoroughly to obtain a mixed solution, and the mixed solution was dried under vacuum at 80°C for 10 h to obtain a precipitate, i.e., a precursor;

[0057] Preparation of positive electrode material: 10g of the above-obtained precursor powder and 3.318g of lithium carbonate were fully mixed and ground to obtain a mixed powder, which was heated to 450°C and kept for 4h, and then continued to be heated to 850°C and kept for 12h to obtain a composite high-voltage ternary positive electrode material, whose composition is LiNi 0.6 Co 0.1 Mn 0.3 Nb 0.2 O2@0.3Ce 0.8 Dy 0.2 O 1.9 0.1LiNbO3 / Li3NbO4;

[0058] Finished product preparation: crush, grade and sieve the composite high-voltage ternary positive electrode material as needed.

[0059] Comparative Example 3

[0060] The preparation process of the composite high voltage ternary material in this comparative example is as follows:

[0061] Wet mixing: 0.3 wt% Ce(NO3)3·6H2O and 0.3 wt% Dy(NO3)3·6H2O were added to deionized water and stirred thoroughly to mix them evenly. Then, 3 μm Ni 0.6 Co 0.1 Mn 0.3 (OH)2 cathode material precursor (produced by Cologne New Energy Company) was poured into the mixed solution and stirred thoroughly to obtain a mixed solution, and the mixed solution was dried under vacuum at 80°C for 10 h to obtain a precursor precipitate;

[0062] Preparation of the positive electrode material: 10 g of the above-obtained precursor powder and 3.318 g of lithium carbonate were thoroughly mixed and ground to obtain a mixed powder, which was heated to 450 °C and held for 4 h, and then further heated to 850 °C and held for 12 h to prepare a composite high-voltage ternary positive electrode material with the composition LiNi 0.6 Co 0.1 Mn 0.3 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6;

[0063] Preparation of the finished product: The composite high-voltage ternary positive electrode material was crushed, classified, and sieved as needed.

[0064] Test examples

[0065] After assembling the positive electrode materials of the lithium-ion batteries in Examples 1-5 and Comparative Examples 1-3 into button cells respectively, the charge-discharge specific capacities of the corresponding button cells were measured.

[0066] 1. Morphology characterization: Figure 2 The morphology characterization of the composite high-voltage ternary positive electrode material in Example 2 of the present invention is shown in Figure 2 It can be seen that the LiNi 0.6 Co 0.1 Mn 0.3 Nb 0.2 O2@0.3Ce 0.8 Dy 0.2 O 1.9 ·0.3Li8CeO6·0.1LiNbO3 / Li3NbO4 composite high-voltage ternary positive electrode material prepared in Example 2 of the present invention has a single-crystal morphology and good morphology.

[0067] 2. Preparation of the button cell is as follows:

[0068] (1) Preparation of the positive electrode sheet: The positive electrode material, conductive agent (acetylene black), and binder (PVDF) were weighed according to a mass ratio of 80%:10%:10%, and the weighed composite high-voltage ternary positive electrode material and acetylene black were mixed and ground in an agate mortar. After grinding evenly, it was added to N-methylpyrrolidone (NMP) that had fully reacted with PVDF and continuously ground until the slurry became a viscous liquid with a certain fluidity. The ground slurry was evenly transferred onto aluminum foil, and the sample was evenly coated with a coater with a thickness of 150 μm. Subsequently, it was pre-baked in air at 60 °C for 5 h, and then evacuated and dried at 90 °C for 12 h to remove water and organic substances in the coated sample. The electrode sheet was cut to size and reserved for use.

[0069] (2) Coin cell assembly: Using a lithium sheet as the negative electrode, the prepared positive electrode sheet as the positive electrode, and an electrolyte ratio of EC:DMC = 1:1, a coin cell was assembled.

[0070] 3. Coin cell testing: Charge-discharge testing was performed using a BTV charge-discharge tester. After testing, at 25°C, the maximum discharge capacity of the lithium-ion battery assembled with this electrode sheet was as shown in Table 1 under a test voltage of 2.8 - 4.55V and a rate of 0.2C.

[0071] Table 1 Coin cell test results of composite high-voltage ternary cathode materials in Examples 1 - 5 and Comparative Examples 1 - 3

[0072]

[0073] In addition, the coin cell prepared from the lithium-ion battery cathode material in Example 2 had an initial discharge capacity of 199.1 mAh / g at a rate of 0.2C, as Figure 2 shown. After 100 cycles, the capacity retention rate was as high as 96.39%, as Figure 3 shown.

[0074] From the above test results, it can be seen that the high-voltage ternary cathode material prepared in the present invention has a uniform and tightly structured single-crystal structure, a high discharge specific capacity, and excellent cycle stability, and can be used as a cathode material for commercial lithium-ion batteries.

[0075] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0076] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A composite high-voltage ternary cathode material, characterized in that, The chemical general formula of the composite high-voltage ternary cathode material is LiNi 1-x-y Co x Mn y Nb a O2@mCe 0.8 Dy 0.2 O 1.9 ·nLi8CeO6·pLiNbO3 / Li3NbO4, where x < 0.3, y < 0.3, 0.7 ≤ 1 - x - y ≤ 0.9, 0 < a < 1000 ppm, 0 < m < 2000 ppm, 0 < n < 2000 ppm, 0 < p < 2000 ppm; The composite high-voltage ternary cathode material is a cathode material co-coated with an oxygen ion conductor Ce 0.8 Dy 0.2 O 1.9 and a fast ion conductor Li8CeO6&LiNbO3 / Li3NbO4, and has a single crystal morphology.

2. A preparation method of the composite high-voltage ternary cathode material as described in claim 1, characterized in that, It includes the following steps: Mix dysprosium salt, cerium salt, niobium salt and water to obtain a mixed solution; add the ternary cathode material precursor into the mixed solution and mix well, and then dry to obtain the precursor; Fully mix and grind the precursor with a lithium source and calcine to prepare a composite high-voltage ternary cathode material.

3. The preparation method according to claim 2, characterized in that, In the mixed solution, the total mass concentration of dysprosium salt, cerium salt and niobium salt is between 30% and 50%.

4. The preparation method according to claim 2, characterized in that, The ratio of the ternary cathode material precursor to the metal salt in the mixed solution is 1wt% - 3wt%.

5. The preparation method according to claim 2, characterized in that, The dysprosium salt is selected from at least one of dysprosium nitrate hexahydrate and dysprosium sulfate; and / or, the cerium salt is selected from at least one of cerium nitrate hexahydrate and cerium sulfate; and / or, the niobium salt is niobium oxynitrate hexahydrate.

6. The preparation method according to claim 2, characterized in that, The ternary cathode material precursor is a conventional commercial nickel-cobalt-manganese ternary precursor, and its chemical general formula is Ni (1-x-y) Co x Mn y (OH)2, where 0.5 ≤ 1 - x - y ≤ 0.8, x < 0.3, and y < 0.

3.

7. The preparation method according to claim 2, characterized in that, The lithium source is selected from at least one of lithium carbonate and lithium hydroxide.

8. The preparation method according to claim 7, characterized in that, The lithium source and the precursor are mixed according to the molar ratio of Li / (Ni + Co + Mn) of (1.01 - 1.07):

1.

9. The preparation method according to claim 2, characterized in that, The drying method is selected from at least one of vacuum drying and freeze drying.

10. The preparation method according to claim 2, characterized in that, The calcination is carried out in stages, specifically: in the first stage, it is heated at 3 - 5°C / min to 450 - 550°C and kept warm for 4 - 6h, and in the second stage, it is heated at 3 - 5°C / min to 700 - 950°C and kept warm for 8 - 24h.

11. The application of the composite high-voltage ternary cathode material as described in claim 1 or the composite high-voltage ternary cathode material prepared by the preparation method described in any one of claims 2 - 10 in the preparation of lithium-ion batteries.

12. A lithium-ion battery, which includes a positive electrode, is characterized in that, The active material of the cathode includes the composite high-voltage ternary cathode material as described in claim 1 or the composite high-voltage ternary cathode material prepared by the preparation method described in any one of claims 2 - 10.

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