A method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process.

Abstract

The present invention discloses a method for manufacturing NCM positive electrode particles coated with LLZO and glass phase by using a sintering process, wherein the manufacturing process of the positive electrode particles comprises the following steps: Step 500: taking a plurality of large NCM particles and a glass phase material and placing them into a first mixer to uniformly mix the two; the glass phase material is a lithium ion conductivity higher than 10 ‑5 S / cm amorphous solid electrolyte; step 510: oxygen sintering the mixed NCM large particles with the glassy material to form NCM large particles with a glassy layer; step 520: placing a plurality of LLZO fine particles and the NCM large particles with a glassy layer into a second mixer for mixing to form composite NCM large particles; step 530: then oxygen sintering the composite NCM large particles to eliminate the interfacial resistance between the LLZO fine particles and the NCM large particles during lithium ion transmission, thereby forming a plurality of sintered powders. The process also includes step 540 of mixing the sintered powders with a carbon material.

Description

Technical Field

[0001] This invention relates to the field of cathode material technology, and in particular to a method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process. Background Technology

[0002] A battery is primarily formed by placing a positive electrode and a negative electrode in an electrolyte. The positive electrode is composed of numerous positive electrode conductive units (positive electrode materials, such as lithium cobalt oxide) mixed and dispersed in a slurry. Generally, the positive electrode conductive units must first be mixed with the conductive slurry before being applied to the electrode sheets and assembled into a battery. Therefore, the numerous positive electrode conductive units (positive electrode materials) are connected to each other through the conductive slurry. Thus, the conductive slurry must possess conductivity or enhance conductivity to allow free electrons to migrate between different positive electrode conductive units without consuming excessive energy due to internal resistance, thereby achieving effective conductivity. Therefore, the conductivity of the slurry must be adjusted using specific conductive materials during its manufacturing process.

[0003] To increase conductivity, multiple positive electrode particles are typically filled into the positive electrode slurry. These particles can be made of materials such as NCM (lithium nickel manganese cobalt oxide), LMFP (lithium manganese iron phosphate), or mixtures thereof, and are distributed throughout the slurry. However, in existing technologies, the interfaces of the positive electrode particles are prone to side reactions, leading to a reduced lifespan of the positive electrode and low electronic conductivity, resulting in poor overall battery performance.

[0004] Based on extensive experience with battery materials, the applicant proposes a novel design to further enhance the conductivity of the slurry. This design involves adding carbon nanotubes and nanoscale amorphous carbon to coat the cathode particles in the battery's cathode material, thereby improving the overall conductivity of the cathode. Furthermore, coating the surface of these cathode particles with a glassy phase material reduces interfacial impedance, improves powder coating properties, stabilizes the powder in the electrolyte, and prevents interfacial side reactions.

[0005] Therefore, existing technologies have shortcomings and need to be improved. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the prior art. This invention proposes a method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process. This method forms a glass phase layer by coating the outer surface of large NCM particles with a glass phase material. This glass phase layer prevents direct contact between the large NCM particles and the electrolyte, reducing interfacial side reactions. Simultaneously, it reduces the interfacial impedance for lithium ions to enter and exit the large NCM particles, improving rate charge / discharge performance. The presence of the glass phase layer also accommodates volume changes during charge / discharge, improving the mechanical properties of the powder and reducing breakage. Furthermore, numerous fine LLZO particles are used to coat the large NCM particles. These fine LLZO particles have the ability to accommodate and equalize lithium ions. Therefore, when lithium ions pass through the cathode, the dispersed fine LLZO particles guide and disperse the lithium ion pathway, allowing for a better lithium ion pathway in the cathode design. In addition, carbon nanotubes and nanoscale amorphous carbon are further coated on the outer surface of the large NCM particles coated with fine LLZO particles. This allows electrons to conduct on the large composite NCM particles, and the amorphous carbon at various nanoscales can fill the gaps formed by the interlacing of multiple carbon nanotubes, creating a more complete electron conduction path. The structure of this invention can provide stability to the overall cathode slurry structure, thereby reducing the amount of cobalt used.

[0007] To achieve the above objectives, this invention proposes a method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process. These cathode particles are present in the cathode of a solid-state or near-solid-state battery. The manufacturing process includes the following steps:

[0008] Step 500: Take NCM (lithium nickel cobalt manganese oxide) material, which consists of multiple large NCM particles; these large NCM particles are irregularly cubic in shape; place the large NCM particles and the glass phase material into the first mixer simultaneously, and stir thoroughly to ensure uniform mixing; the glass phase material has a lithium-ion conductivity higher than 10. -5 Non-crystalline solid electrolyte with S / cm;

[0009] Step 510: Then, the stirred NCM large particles and the glass phase material are sintered in an oxygen-enriched manner; after sintering, the NCM large particles are coated with a glass phase layer formed by the glass phase material, forming NCM large particles with a glass phase layer; this glass phase layer can prevent the NCM large particles from direct contact with the electrolyte, reduce interfacial side reactions; and at the same time reduce the interfacial resistance of lithium ions entering and leaving the NCM large particles.

[0010] Step 520: Mix LLZO (lithium lanthanum zirconium oxide) material with NCM large particles with a glass phase layer. The LLZO material consists of multiple LLZO fine particles. Place the NCM large particles with a glass phase layer and the LLZO fine particles into a second mixer and stir thoroughly to make the LLZO fine particles evenly distributed in the glass phase layer or on the surface, forming composite NCM large particles.

[0011] Step 530: Next, the composite NCM large particles are sintered in an oxygen-enriched environment. The sintering process is used to eliminate the interfacial resistance between the LLZO fine particles and the NCM large particles during lithium-ion transport, forming multiple sintered powders.

[0012] The method for manufacturing NCM cathode particles coated with LLZO and glass phase using the sintering process further includes step 540: mixing sintered powder, multiple CNTs (Carbon Nanotubes), and multiple nanoscale amorphous carbon materials.

[0013] The features and advantages of the present invention can be further understood through the following description, and please refer to the accompanying drawings while reading. Attached Figure Description

[0014] Figure 1 This diagram shows the manufacturing process of the positive electrode particle of the present invention.

[0015] Figure 2 This diagram shows the structure of the positive electrode particle of the present invention.

[0016] Figure 3 This diagram shows the structure of the positive electrode of the present invention.

[0017] Figure 4 This diagram shows the structure of the composite NCM large particles of the present invention.

[0018] Figure 5 This diagram shows the structure of the composite NCM large particles of the present invention.

[0019] Figure 6 This diagram shows the structure of the composite NCM large particles of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] The structural composition of the present invention, as well as its effects and advantages, are described in detail below with reference to the accompanying drawings, and a preferred embodiment of the present invention is provided.

[0022] Please refer to Figures 1 to 6 The figure shows a method of manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process according to the present invention.

[0023] like Figure 3 As shown, the positive electrode 100 of a typical solid-state or solid-state-like battery includes:

[0024] A positive electrode substrate 10;

[0025] A positive electrode paste layer 12 is coated on the positive electrode substrate 10, wherein the positive electrode paste layer 12 comprises:

[0026] A positive electrode slurry 14 containing a binder; wherein the binder is such as PVDF (polyvinylidene difluoride), PEO (poly(ethylene oxide)), etc.

[0027] Multiple positive electrode particles 200, which account for 80wt% to 98wt% of the positive electrode slurry layer 12.

[0028] The manufacturing process of the positive electrode particle 200 (please refer to...) Figure 1 It includes the following steps:

[0029] The material is NCM (lithium nickel cobalt manganese oxide), which consists of multiple large NCM particles 22, each with a size of 3 to 5 micrometers; it has a single crystal structure. The large NCM particles 22 are irregularly cubic in shape.

[0030] Step 500: The NCM large particles 22 and the glass phase material are simultaneously placed into a first mixer 50 (such as a dry mixer: a three-dimensional mixer or a flat roller mixer or a wet mixer: a DC impeller mixer, wherein anhydrous alcohol or isopropanol solvent is added to the wet mixer) and stirred thoroughly to ensure that the two are uniformly mixed. The rotation speed of the first mixer 50 is 20 rpm to 500 rpm and the stirring time is 2 hours to 12 hours.

[0031] The glass phase material has a lithium-ion conductivity higher than 10. -5 Non-crystalline oxide or non-oxide solid electrolytes with a S / cm. Examples include lithium oxides of Group IIIA, IVA, and VA (e.g., Li₂O-RO). x R = at least one of B (boron), Al (aluminum), Si (silicon), Ge (germanium), P (phosphorus), As (arsenic), etc., x = 1 to 3), or an amorphous oxide-based solid electrolyte (such as amorphous perovskite solid electrolyte (LLTO), garnet solid electrolyte (LLZO), or at least one of lithium-phosphorus-oxy-nitride (LiPON).

[0032] Step 510: Then, the stirred NCM macroparticles 22 and the glass phase material are subjected to oxygen sintering, wherein the sintering temperature is 250°C to 650°C, the temperature is increased by 1.5°C to 5°C per minute, and the highest temperature is held for 0.5 hours to 4 hours. After sintering, a glass phase layer 25 is formed by coating the NCM macroparticles 22 with the glass phase material, thus forming NCM macroparticles 250 with a glass phase layer. The thickness of the glass phase layer 25 is between 5 nanometers and 100 nanometers.

[0033] The glass phase layer 25 can prevent the large NCM particles 22 from directly contacting the electrolyte, reducing interfacial side reactions; at the same time, it reduces the interfacial impedance of lithium ions entering and leaving the large NCM particles 22, improving the rate charge and discharge performance. The presence of the glass phase layer 25 can accommodate the volume change during charge and discharge, improving the mechanical properties of the powder and reducing breakage.

[0034] Step 520: Apply LLZO (lithium lanthanum zirconium oxide) material (such as Li) 6.2 Ga 0.8 La3Zr2O 12 (Gas-doped lithium lanthanum zirconium oxide) is mixed with the large NCM particles 250 having a glass phase layer, wherein the LLZO material consists of multiple LLZO fine particles 24, and the maximum radial dimension of a single LLZO fine particle 24 is less than 40 nanometers.

[0035] The aforementioned large NCM particles 250 with a glass phase layer and the fine LLZO particles 24 are simultaneously placed into a second mixer 52 (such as a three-dimensional mixer or a flat roller mixer) and thoroughly stirred to achieve uniform mixing. The second mixer 52 rotates at 20 rpm to 500 rpm for 2 to 12 hours. After stirring, the fine LLZO particles 24 are distributed within or on the surface of the glass phase layer 25, forming a composite NCM large particle 20 (such as...). Figure 4 ).

[0036] The LLZO in the fine LLZO particles 24 is preferably selected from at least one of Ga-LLZO (gallium-doped lithium lanthanum zirconium oxide), Cu-LLZO (copper-doped lithium lanthanum zirconium oxide), Ta-LLZO (tantalum-doped lithium lanthanum zirconium oxide), Sr-LLZO (strontium-doped lithium lanthanum zirconium oxide), and Al-LLZO (aluminum-doped lithium lanthanum zirconium oxide).

[0037] Preferred LLZO is selected from Cua,Xb-LLZO (copper-doped lithium lanthanum zirconium oxide), where X is selected from Ga (gallium), Ta (tantalum), Sr (strontium), Ba (barium), and Al (aluminum), and a+b = 0.25 to 0.8, a > 0.1. Using copper doping in LLZO is quite difficult, but it can make the overall structure more stable, the lithium-ion channels smoother, and it increases the sintering speed while being relatively inexpensive to manufacture. It also reduces the formation of lithium carbonate when the material is exposed to air, thus increasing the surface stability of the entire material during sintering.

[0038] In a single composite NCM large particle 20, the total weight of all the LLZO fine particles 24 is between 0.2 wt% and 2 wt% of the weight of the NCM large particles 250 with the glass phase layer.

[0039] Step 530: Next, the composite NCM large particles 20 are subjected to oxygen sintering at a temperature of 550 to 650°C, with a heating rate of 1.5°C to 5°C per minute, and held at the highest temperature for 0.5 to 2 hours. This sintering process eliminates the interfacial resistance between the LLZO fine particles 24 and the NCM large particles 22 during lithium-ion transport, forming multiple sintered powders 40. Essentially, after sintering, the LLZO fine particles 24 widen in the transverse direction along the surface of the composite NCM large particles 20, while shortening in the longitudinal direction, with the overall volume remaining unchanged. After sintering, the LLZO fine particles 24 adhere to the NCM large particles 250 with a glass phase layer, forming the composite NCM large particles 20.

[0040] The next step is to mix the sintered powder 40, multiple CNTs 30 (Carbon Nanotubes), and multiple nanoscale amorphous carbon 35 to form carbon-coated cathode particles 300. There are two methods for this, which are described below:

[0041] Step 540A: The sintered powder 40, the plurality of CNTs 30, and the plurality of nano-sized amorphous carbon 35 are simultaneously placed into a dry stirrer 55 (such as a planetary stirrer or a drum stirrer) for mixing, so that the CNTs 30 and the nano-sized amorphous carbon 35 coat the composite NCM large particles 20 to form the coated carbon material cathode particles 300 (such as... Figure 1 The dry mixer 55 has a mixing speed of 50 rpm to 500 rpm and a mixing time of 2 hours to 8 hours.

[0042] This nanoscale amorphous carbon 35 acts as a super P conductive agent. The size of this nanoscale amorphous carbon 35 ranges from 20 nanometers to 100 nanometers. Each of these nanoscale amorphous carbon 35 particles is primarily located within the voids formed by the interlacing of multiple CNT 30 particles (e.g., ...). Figure 2 The total weight of this nanoscale amorphous carbon 35 accounts for between 0.1 wt% and 2 wt% of the weight of a single composite NCM macroparticle 20.

[0043] Alternatively, step 530 can be followed by step 540B.

[0044] Step 540B: ​​The CNT 30 is first mixed with the sintered powder 40, and then mixed with the nano-sized amorphous carbon 35 to form the positive electrode particles 300 coated with carbon material. The CNTs and the sintered powder are mixed using either dry ball milling or wet ball milling.

[0045] Dry ball milling involves placing the CNT 30 and the sintered powder 40 directly into a dry ball mill 57 for ball milling. The dry ball mill 57 operates at a speed between 50 rpm and 1000 rpm, with a mixing time between 20 minutes and 12 hours, and the ball milling is carried out at room temperature to 50 degrees Celsius.

[0046] Another mixing method is wet ball milling, in which the CNT 30 is dispersed in a dispersant and then placed in a wet ball mill 56 with the sintered powder 40 for wet ball milling. The speed of the wet ball mill 56 is between 50 rpm and 500 rpm, and the mixing time is between 20 minutes and 12 hours. The dispersant is selected from polar or non-polar non-aqueous organic solvents.

[0047] After mixing the CNT 30 with the sintered powder 40 using any of the ball milling methods described above, the nano-sized amorphous carbon 35 is added and mixed, so that the CNT 30 and the nano-sized amorphous carbon 35 coat the composite NCM large particles 20 to form the positive electrode particles 300 of the coated carbon material.

[0048] The CNT 30 consists of short-chain CNT 32 and long-chain CNT 34. The length of the short-chain CNT 32 is between 0.5 micrometers and 1 micrometer, and the length of the long-chain CNT 34 is between 3 micrometers and 8 micrometers. The total weight of the CNT 30 accounts for between 0.1 wt% and 2 wt% of the weight of a single NCM large particle 22.

[0049] The CNT 30 can form different levels of bridging on the composite NCM macroparticles 20. The more CNTs 30 added, the better the overall conductivity of the composite NCM macroparticles 20. Figure 5 and 6As shown, the short-chain CNT 32 is used to bridge the LLZO fine particles 24 and the NCM large particles 22. The long-chain CNT 34 is used to completely encapsulate the composite NCM large particles 20. CNT is a fairly good conductive material, and when it is attached to the composite NCM large particles 20, it forms a shape like a ball of yarn (e.g., Figure 2 ).

[0050] Carbon nanotubes 30 (CNTs 30) are used to increase electronic conductivity by forming conductive bridges around the various LLZO fine particles 24, allowing electrons to conduct across the composite NCM large particles 20. The carbon nanotubes 30 are randomly distributed on the surface of the composite NCM large particles 20. Because carbon nanotubes have extremely high conductivity, electrons can conduct between the different LLZO fine particles 24 and the NCM large particles 22 via the carbon nanotubes, thus increasing the overall conductivity of the positive electrode 100.

[0051] The nanoscale amorphous carbon 35, like the CNT 30, serves as a conductive agent. Because the nanoscale amorphous carbon 35 is in particulate form, while the carbon nanotubes 30 are elongated, gaps are formed between the crisscrossing nanotubes 30. These gaps cannot conduct current. Therefore, adding the nanoscale amorphous carbon 35 into these gaps allows charge to be conducted to the next carbon nanotube 30 through the bridging of the nanoscale amorphous carbon 35, thus further increasing current transfer.

[0052] In this invention (CNT 30 + nano-grade amorphous carbon 35): 20 individual composite NCM particles = (0.09 to 3): 100 (by weight).

[0053] The ratio of CNT30: nano-grade amorphous carbon 35: single composite NCM large particles 20 (containing LLZO and NCM large particles with a glass phase layer) is 0.5:1:100 (by weight).

[0054] After sintering and stirring, the NCM large particles 22 have a size of 3 to 5 micrometers; the LLZO fine particles 24 have a lateral dimension (i.e., the dimension along the spherical surface) between 50 nanometers and 300 nanometers. The nanoscale amorphous carbon 35 has a size between 20 nanometers and 100 nanometers.

[0055] The advantage of using carbon nanotubes in this invention is that lithium ions can be easily stabilized between these nanotubes. Therefore, the positive electrode slurry in this invention can stabilize a large number of lithium ions, thus improving the overall lithium ion conductivity. Furthermore, electrons can be easily fixed between these short-chain carbon nanotubes, thereby improving the overall lithium ion conductivity. Moreover, because the ion conductivity is very high, it facilitates rapid charging and discharging of the entire battery. Additionally, it reduces the amount of cobalt used, lowering the overall production cost.

[0056] The advantages of this invention are that a glass phase material is coated onto the outer surface of the large NCM particles to form a glass phase layer. This glass phase layer can prevent direct contact between the large NCM particles and the electrolyte, reducing interfacial side reactions; it also reduces the interfacial impedance for lithium ions to enter and exit the large NCM particles, improving rate charge and discharge performance. Furthermore, the presence of the glass phase layer can accommodate volume changes during charge and discharge, improving the mechanical properties of the powder and reducing breakage. The large NCM particles are further coated with numerous fine LLZO particles. These fine LLZO particles have the ability to accommodate and equalize lithium ions. Therefore, when lithium ions pass through the positive electrode, the dispersed LLZO particles can guide and disperse the lithium ion pathway, thus the design of the positive electrode of this invention provides a better pathway for lithium ions. This invention also further coats the outer surface of the large NCM particles coated with fine LLZO particles with carbon nanotubes and nanoscale amorphous carbon. This allows electrons to conduct on the composite NCM particles, and the nanoscale amorphous carbon particles can fill the gaps formed by the interlacing of multiple carbon nanotubes, forming a more complete electron conduction path. The structure of this invention can provide stability to the overall positive electrode slurry structure, thus reducing the amount of cobalt used.

[0057] In summary, the human-centered and considerate design of this invention is highly suitable for practical needs. Its specific improvements over existing deficiencies represent a significant breakthrough compared to known technologies, offering substantial functional enhancements that are not easily achieved. Furthermore, this invention has not been publicly disclosed or revealed in domestic or international literature or markets, thus complying with patent law requirements.

[0058] The above detailed description is a specific description of a feasible embodiment of the present invention. However, this embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the spirit of the present invention should be included within the patent scope of the present invention.

Claims

1. A method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process, characterized in that, The positive electrode particle is present in the positive electrode of a solid-state or solid-state-like battery, and the manufacturing process of the positive electrode particle includes the following steps: Step 500: Take NCM material, specifically lithium nickel cobalt manganese oxide material, wherein the NCM material consists of multiple large NCM particles; wherein the large NCM particles are irregularly cubic in shape; place the large NCM particles and the glass phase material simultaneously into a first mixer and stir thoroughly to ensure uniform mixing; the glass phase material has a lithium-ion conductivity higher than 10. -5 A non-crystalline oxide or amorphous oxide-based solid electrolyte with a S / cm, wherein the non-crystalline oxide is an oxide of lithium and group IIIA, IVA, or VA; the size of a single NCM particle is 3 to 5 micrometers. Step 510: Next, the stirred NCM large particles and the glass phase material are subjected to oxygen sintering; after sintering, the NCM large particles are coated with a glass phase layer formed by the glass phase material, thus forming NCM large particles with a glass phase layer; in step 510, the sintering temperature is 250°C to 650°C, the temperature is increased by 1.5°C to 5°C / minute, and the temperature is held at the highest temperature for 0.5 hours to 4 hours; Step 520: Mix the LLZO material with the NCM large particles having a glass phase layer, wherein the LLZO material consists of multiple LLZO fine particles; simultaneously place the NCM large particles with the glass phase layer and the LLZO fine particles into a second mixer and stir them thoroughly to achieve uniform mixing. After stirring, the LLZO fine particles are distributed within or on the surface of the glass phase layer, forming composite NCM large particles; the LLZO material is lithium lanthanum zirconium oxide material; the maximum radial dimension of the LLZO fine particles is less than 40 nanometers; Step 530: Next, the above-mentioned composite NCM large particles are subjected to oxygen sintering to form multiple sintered powders; in step 530: the sintering temperature is 550℃ to 650℃, the temperature is increased by 1.5℃ to 5℃ / minute, and the temperature is held at the highest temperature for 0.5 hours to 2 hours. Step 540: Mix the sintered powder, multiple CNTs and multiple nanoscale amorphous carbons with carbon materials to form positive electrode particles coated with carbon materials.

2. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, in Each of these large NCM particles has a single-crystal structure; The thickness of the glass phase layer is between 5 nanometers and 100 nanometers.

3. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, In step 500, the first mixer is selected from a three-dimensional mixer, a flat roller mixer, or a DC impeller mixer; Anhydrous alcohol or isopropanol solvent is added to the DC impeller mixer and stirred thoroughly to ensure uniform mixing.

4. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The material of this glass phase is selected from Li2O-RO x Where R is at least one of boron, aluminum, silicon, germanium, phosphorus, and arsenic, and x = 1 to 3; LLTO; LLZO; LiPON; At least one of the above items.

5. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The LLZO in the fine LLZO particles is selected from at least one of gallium-doped lithium lanthanum zirconium oxide, copper-doped lithium lanthanum zirconium oxide, tantalum-doped lithium lanthanum zirconium oxide, strontium-doped lithium lanthanum zirconium oxide, and aluminum-doped lithium lanthanum zirconium oxide.

6. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The LLZO is selected from Cu a X b -LLZO, namely copper-doped lithium lanthanum zirconium oxide, where X is selected from at least one of gallium, tantalum, strontium, barium, and aluminum, and a+b=0.25 to 0.8, a>0.

1.

7. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, In a single composite NCM macroparticle, the total weight of all the LLZO fine particles is between 0.2 wt% and 2 wt% of the weight of the NCM macroparticle with the glass phase layer.

8. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, In step 520, the second mixer rotates at a speed of 20 rpm to 500 rpm and the mixing time is 2 hours to 12 hours.

9. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The carbon material is mixed by placing the sintered powder, multiple CNTs, and multiple nano-sized amorphous carbons into a dry stirrer for mixing, so that the CNTs and nano-sized amorphous carbons coat the composite NCM large particles to form the positive electrode particles of the coated carbon material; wherein the stirring speed of the dry stirrer is 50 rpm to 500 rpm, and the stirring time is 2 hours to 8 hours.

10. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The carbon material is mixed in the following manner: the CNT is first mixed with the sintered powder, and then mixed with the nano-sized amorphous carbon to form the positive electrode particles coated with carbon material; the CNT and the sintered powder are mixed by dry ball milling or wet ball milling.

11. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 10, characterized in that, The dry ball milling method involves directly placing the CNT and the sintered powder into a dry ball mill for ball milling. The speed of the dry ball mill is between 50 rpm and 1000 rpm, the mixing time is between 20 minutes and 12 hours, and the ball milling is carried out at room temperature to 50 degrees Celsius. Then, the nano-sized amorphous carbon is added and mixed, so that the CNT and the nano-sized amorphous carbon coat the composite NCM large particles to form the positive electrode particles of the coated carbon material.

12. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 10, characterized in that, The wet ball milling method involves dispersing the CNT in a dispersant and then placing it together with the sintered powder into a wet ball mill for wet ball milling. The speed of the wet ball mill is between 50 rpm and 500 rpm, and the mixing time is between 20 minutes and 12 hours. The dispersant is selected from polar or non-polar non-aqueous organic solvents. Then, the nano-sized amorphous carbon is added and mixed, so that the CNT and the nano-sized amorphous carbon coat the composite NCM large particles to form the positive electrode particles of the coated carbon material.

13. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The amorphous carbon at this nanoscale ranges in size from 20 nanometers to 100 nanometers; each of these nanoscale amorphous carbons is mainly located between the voids formed by the interlacing of multiple CNTs; The total weight of the nanoscale amorphous carbon accounts for between 0.1 wt% and 2 wt% of the weight of a single composite NCM particle.

14. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The CNT consists of short-chain CNTs and long-chain CNTs. The length of the short-chain CNTs is between 0.5 micrometers and 1 micrometer, and the length of the long-chain CNTs is between 3 micrometers and 8 micrometers. The short-chain CNTs are used to bridge the LLZO fine particles and the NCM large particles. The long-chain CNTs are used to encapsulate the composite NCM large particles.

15. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The total weight of the CNT accounts for between 0.1 wt% and 2 wt% of the weight of a single composite NCM particle.

16. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, Wherein (the CNT + the nano-grade amorphous carbon): the ratio of a single composite NCM particle is (0.09 to 3): 100, which is the weight ratio.

17. The method for manufacturing NCM cathode particles coated with LLZO and a glass phase using a sintering process as described in claim 1, characterized in that, The ratio of CNT : nanoscale amorphous carbon : single composite NCM large particle is 0.5 : 1 : 100, which is the weight ratio.

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