CN112758993A - High-safety multi-element precursor, high-safety multi-element precursor cathode material and high-safety multi-element precursor cathode material production method - Google Patents
High-safety multi-element precursor, high-safety multi-element precursor cathode material and high-safety multi-element precursor cathode material production method Download PDFInfo
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Abstract
The invention discloses a high-safety production method of a multi-element precursor, which comprises the following steps: s1, mixing soluble nickel salt and soluble cobalt salt to prepare a nickel-cobalt inorganic salt mixed solution; preparing soluble manganese salt into manganese salt solution; preparing soluble aluminum salt into an aluminum salt solution by using a NaOH solution; s2, preparing a sodium hydroxide solution and an ammonia water solution; s3, adopting a coprecipitation method for production, firstly determining the material flow ratio according to the product requirements, simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into a reaction kettle, after reacting for 1-4 h, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 2-4 h, then switching to injecting the aluminum salt solution for 1-4 h, and repeatedly switching according to the above until the product particle size meets the process requirements; and S4, post-treating the slurry obtained by the reaction to obtain the high-safety multi-element precursor. The advantages are that: the cycle performance and the safety performance of the cathode material can be obviously improved.
Description
Technical Field
The invention relates to a lithium ion battery production technology, in particular to a precursor production technology.
Background
With the advent of the oil ban plan in each country, the development of lithium ion batteries in the new energy automobile industry is pushed to a new climax, and particularly as the power of new energy automobiles, the endurance capacity of the lithium ion batteries is a performance index which is focused on at present. A positive electrode material, which is one of the key materials of a lithium ion battery, has been required to have a higher capacity, so that a high nickel material is currently in the direction of development. However, the great increase in capacity is accompanied by the sacrifice of safety and cycle performance. In order to balance the performances of the cathode material in all aspects, many researchers choose to modify the cathode material, and the modification means mostly adopt a coating or doping mode. However, the high temperature reaction between the solid phases is prone to cause the problem of uneven mixing, and it is not easy to ensure that the products in each batch can completely react. The precursor is used as the precursor of the anode material, and plays a great decisive role in the performance of the anode material. The high nickel precursors currently on the market are classified from the main element types, and mainly comprise NCM and NCA. The two materials have respective characteristics, the NCM has relatively good processability, but from the synthesis result of precursors, the primary particles on the surface of the NCM precursor secondary particles can present various appearances, and at present, the primary particles commonly have spindle rod shapes, laminated layers, needle shapes, granular shapes, lath shapes, sheet shapes and the like, the structure determines the performance, and although the various structural forms give more choices to the material performance, the variability and the instability of the internal structure are also illustrated from the side. NCA is relatively poor in processability, but the primary particles on the surface of the precursor secondary particles exhibit a single form, indicating that the internal structure of the NCA precursor material is relatively stable.
In order to fuse the respective characteristics of two precursor materials and simultaneously solve the problem of uneven doping and coating of the anode material, the invention provides a high-safety multi-element precursor synthesis technology, wherein two elements, namely Al and Mn, are added into an NC binary material in a staggered manner, so that the two elements can enter the structure of the multi-element precursor at the atomic level, and the respective functions are exerted while the mutual limiting and mutual synergistic effects among atoms are achieved. After the synthesized precursor is sintered into the anode material, the cost is reduced, and the structural stability and safety of the material can be improved.
Disclosure of Invention
The invention provides a high-safety multielement precursor production method for improving the cycle performance and safety performance of a lithium ion battery anode material.
The technical scheme adopted by the invention is as follows: the production method of the high-safety multi-element precursor comprises the following steps:
s1, mixing soluble nickel salt and soluble cobalt salt with deionized water to prepare a nickel-cobalt inorganic salt mixed solution with the metal ion concentration of 0.1-2 mol/L; preparing soluble manganese salt into a manganese salt solution with the metal ion concentration of 0.1-2 mol/L by using deionized water; preparing soluble aluminum salt into an aluminum salt solution with the metal ion concentration of 0.1-2 mol/L by using a NaOH solution;
s2, preparing a sodium hydroxide solution with the concentration of 3-15 mol/L and an ammonia water solution with the concentration of 5-10 mol/L;
s3, adopting a coprecipitation method for production, firstly determining the material flow ratio according to the product requirements, simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into a reaction kettle, after reacting for 1-4 h, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 2-4 h, then switching to injecting the aluminum salt solution for 1-4 h, and repeatedly switching according to the above until the product particle size meets the process requirements;
and S4, post-treating the slurry obtained by the reaction to obtain the high-safety multi-element precursor.
As a further improvement of the present invention, the coprecipitation method is one selected from a continuous coprecipitation method, a batch coprecipitation method, or a combined continuous-batch coprecipitation method.
As a further improvement of the present invention, step S3 specifically includes: adding a required amount of base solution into a reaction kettle, introducing nitrogen for protection, heating and adding the ammonia water solution to adjust the ammonia value of the reaction base solution to be required by the process, adding the sodium hydroxide solution to adjust the pH to be required by the process after the reaction temperature is reached, then simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into the reaction kettle after the material flow proportion is determined according to the product requirement, continuously introducing nitrogen, after reacting for 1-4 h, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 2-4 h, then switching to injecting the aluminum salt solution for 1-4 h, and repeatedly switching according to the above steps until the product particle size reaches the process requirement.
As a further improvement of the invention, the soluble nickel salt is selected from one or a mixture of any of nickel sulfate, nickel nitrate, nickel carbonate and nickel acetate. The soluble cobalt salt is selected from one or a mixture of any more of cobalt sulfate, cobalt nitrate, cobalt carbonate and cobalt acetate. The soluble manganese salt is selected from one or a mixture of any more of manganese sulfate, manganese nitrate, manganese carbonate and manganese acetate. The soluble aluminum salt is selected from one or a mixture of any more of aluminum sulfate, aluminum nitrate, aluminum carbonate and aluminum acetate.
As a further improvement of the present invention, step S4 specifically includes: and (3) feeding the slurry generated by the reaction into a filtering device, pulping and washing the obtained filter cake with aqueous alkali of which the weight is 1-10 times that of the filter cake, washing the filter cake for a plurality of times with deionized water of which the weight is 1-10 times that of the filter cake, filtering to obtain a filter cake to be dried, and drying for 2-24 hours at the temperature of 100-150 ℃ to obtain the high-safety multi-element precursor.
The invention also discloses a high-safety multi-element precursor, which is prepared by the production method of the high-safety multi-element precursor. More preferably, the molar ratio of the elements in the high-safety multi-element precursor is Ni, Co, Mn and Al is 87-95: 5-2: 5-1.
The invention also discloses a preparation method of the cathode material, which comprises the step of mixing the high-safety multi-element precursor and a lithium-containing compound and then sintering. It is easy to understand that the lithium-containing compound can be selected from one or a mixture of any of lithium hydroxide, lithium carbonate, lithium acetate and lithium chloride.
The invention also discloses a positive electrode material which is prepared by the preparation method of the positive electrode material.
The invention also discloses a lithium ion battery which comprises the cathode material.
The invention also discloses a vehicle comprising the lithium ion battery.
The invention has the beneficial effects that: the cycle performance and the safety performance of the cathode material can be obviously improved.
Drawings
FIG. 1 is a graph of the particle micro-topography and the final product micro-topography of the process of example one.
FIG. 2 is a graph showing the results of dispersion analysis (EDS detection) of the elemental distribution of the product obtained in example one.
FIG. 3 is a graph of the process particle micro-topography versus the final product micro-topography of example two.
FIG. 4 is a graph showing the results of dispersion analysis (EDS detection) of the elemental distribution of the product in example two.
FIG. 5 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The first embodiment is as follows:
(1) firstly, preparing nickel sulfate and cobalt sulfate into nickel-cobalt inorganic salt mixed solution with metal ion concentration of 1.5mol/L by using deionized water;
(2) preparing manganese sulfate into a manganese salt solution with the metal ion concentration of 1mol/L by using deionized water;
(3) preparing aluminum sulfate into an aluminum salt solution with the metal ion concentration of 0.5mol/L by using a NaOH solution;
(4) preparing NaOH precipitant into 5mol/L sodium hydroxide solution by using deionized water;
(5) diluting the ammonia water solution into 2mol/L ammonia water solution by deionized water for later use;
(6) adding 30L of base solution into a reaction kettle, introducing nitrogen for protection, starting stirring at the stirring speed of 700rpm, heating, adding the ammonia water solution, adjusting the ammonia value of the reaction base solution to 0.60-0.70 mol/L, adding the sodium hydroxide solution, adjusting the pH value to 11.80-12.00 after the reaction temperature is 50 ℃, determining the material flow ratio according to the requirement of a product, namely Ni, Co, Mn, Al, 93:2:2:3, simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into the reaction kettle, continuously introducing nitrogen, controlling the pH value in the preparation process to be 11.70 +/-0.1, after reacting for 4 hours, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 4 hours, then switching to injecting the aluminum salt solution for 4 hours, and repeatedly switching according to the above steps until the particle size of the product reaches D50-11 mu m-13 mu m.
(7) Aging the slurry generated by the reaction for 5h, then feeding the slurry into a filtering device, pulping and washing the obtained filter cake by using a dilute alkali solution with the weight 8 times that of the filter cake, washing the filter cake for a plurality of times by using deionized water with the weight 10 times that of the filter cake, and filtering the filter cake after the content of each impurity reaches the standard. Drying for 24h at 130 ℃ to obtain a multi-element precursor product. The ratio of the prepared product is measured as Ni: co: mn: 92.83:1.99:2.15:3.03, the grain diameter D50 is 12.24 μm, and the sulfur element content in the product is as follows: 565 ug/g. The microstructure of the particles during the preparation process is consistent with that of the final product, and the detail is shown in figure 1. The results of the product element distribution dispersion analysis (EDS detection) are shown in fig. 2. The intelligent quantification results of product elements are shown in table 1.
(8) The precursor and lithium hydroxide were uniformly mixed at a molar ratio of M (Ni + Co + Mn + Al) to M (li): 1:1.05, and then calcined at 400 ℃ for 4 hours, then taken out and ground, and further calcined at 800 ℃ for 20 hours, and then taken out and ground to obtain a positive electrode material (a1), and then electrochemical properties were measured, as detailed in table 3, which shows the results of measuring electrochemical properties of the positive electrode material.
Example two:
(1) firstly, preparing nickel sulfate and cobalt sulfate into nickel-cobalt inorganic salt mixed solution with metal ion concentration of 2mol/L by using deionized water;
(2) preparing manganese sulfate into a manganese salt solution with the metal ion concentration of 1.5mol/L by using deionized water;
(3) preparing aluminum sulfate into an aluminum salt solution with the metal ion concentration of 1mol/L by using a NaOH solution;
(4) preparing NaOH precipitant into 10mol/L sodium hydroxide solution by using deionized water;
(5) diluting the ammonia water solution into 5mol/L ammonia water solution by using deionized water for later use;
(6) adding 30L of base solution into a reaction kettle, introducing nitrogen for protection, starting stirring at the stirring speed of 800rpm, heating, adding the ammonia water solution, adjusting the ammonia value of the reaction base solution to 0.70-0.80 mol/L, adding the sodium hydroxide solution, adjusting the pH value to 11.90-12.10 after the reaction temperature is 45 ℃, determining the material flow ratio according to the product requirement Ni: Co: Mn: Al: 90:2:3:5, simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into the reaction kettle, continuously introducing nitrogen, controlling the pH value in the preparation process to be 11.40-11.50, stopping injecting the aluminum salt solution after reacting for 3 hours, simultaneously switching to injecting the manganese salt solution for 2 hours, then switching to injecting the aluminum salt solution for 3 hours, and repeatedly switching according to the above steps until the particle size of the product reaches D50-11 mu m.
(7) Aging the slurry generated by the reaction for 5h, then feeding the slurry into a filtering device, pulping and washing the obtained filter cake by using a dilute alkali solution with the weight 8 times that of the filter cake, washing the filter cake for a plurality of times by using deionized water with the weight 10 times that of the filter cake, and filtering the filter cake after the content of each impurity reaches the standard. Drying for 24h at 130 ℃ to obtain a multi-element precursor product. The ratio of the prepared product is measured as Ni: co: mn: the Al is 90.05:1.90:3.05:5.0, the grain diameter is D50-10.64 mu m, and the sulfur element content of the product is as follows: 643. mu.g/g. The microstructure of the particles during the preparation process is consistent with that of the final product, and the detail is shown in figure 3. The results of the product element distribution dispersion analysis (EDS detection) are shown in fig. 4. The intelligent quantification results of product elements are shown in table 2.
(8) The precursor and lithium hydroxide were uniformly mixed at a molar ratio of M (Ni + Co + Mn + Al) to M (li): 1:1.05, and then calcined at 450 ℃ for 4 hours, then taken out and ground, and further calcined at 750 ℃ for 20 hours, and then taken out and ground to obtain a positive electrode material (a2), and then electrochemical properties were measured, as detailed in table 3, which shows the results of measuring electrochemical properties of the positive electrode material.
Comparative example one:
this comparative example is a control experiment of example one, carried out following exactly the same process steps and controlled conditions as example one, with the only difference that: and (6) introducing the aluminum salt solution and the manganese salt solution simultaneously. The method specifically comprises the following steps: (6) adding 30L of base solution into a reaction kettle, introducing nitrogen for protection, starting stirring at the stirring speed of 700rpm, heating, adding the ammonia water solution, adjusting the ammonia value of the reaction base solution to 0.60-0.70 mol/L, adding the sodium hydroxide solution, adjusting the pH value to 11.80-12.00 after the reaction temperature is 50 ℃, determining the material flow ratio according to the product requirement that Ni, Co, Mn and Al are 93:2:2:3, then simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the manganese salt solution, the sodium hydroxide solution and the ammonia water solution into the reaction kettle, and continuously introducing nitrogen, wherein the pH control range in the preparation process is 11.70 +/-0.1 until the particle size of the product reaches D50 which is 11-13 mu m.
The electrochemical properties of the obtained positive electrode material (D1) were measured, and the details are shown in table 3, which is a table of the results of measuring the electrochemical properties of the positive electrode material.
The electrochemical performance detection method of the anode material comprises the following steps:
three positive electrode materials prepared in examples 1-2 and comparative example 1 were mixed into slurry according to the ratio of conductive carbon to polyvinylidene fluoride (PVDF) to 90:5:5 to prepare a positive electrode sheet (the sheet compaction density was 3.3 g/cm)2) A metal lithium sheet is selected as a negative electrode material to assemble the 2025 button cell;
1. cycle performance: using 1M LiPF6 EC, DEC and DMC as 1:1: 1V% as electrolyte, activating for three circles at a rate of 0.2C, cycling for 100 times at a rate of 0.2C, respectively measuring the discharge capacity at the 1 st cycle and the discharge capacity at the 100 th cycle, and calculating the capacity retention rate of the cycling for 100 times; calculating the formula: the capacity retention (%) after 100 cycles was 100 cycles/100 cycles of discharge capacity at 1 cycle, and the specific capacity and the cycle retention of the material were obtained and are detailed in table 3.
2. The safety performance test is that the battery is charged to 4.5V at a constant current of 0.2C and is charged to 0.1C at a constant voltage of 4.5V at a normal temperature (25 ℃); disassembling the battery in an argon-protected glove box, taking out the positive plate, and cleaning in a DMC solution; after DMC is completely volatilized, scraping electrode materials from the surface of the positive plate, weighing 10mg of the electrode materials, putting the electrode materials into a special aluminum crucible, adding 0.1uL of electrolyte, and sealing; the scanning temperature range of DSC test is 50-500 ℃, and the heating rate is 10 ℃/min.
TABLE 1 Intelligent quantitative results table for a single element of the examples
| Element(s) | Weight percent of | Atomic percent | Net strength | Error% | R | A | F |
| AlK | 7.24 | 14.51 | 46.35 | 10.09 | 0.8303 | 0.2292 | 1.0044 |
| MnK | 0.89 | 0.88 | 7.75 | 14.21 | 0.8919 | 0.9503 | 1.4684 |
| CoK | 1.83 | 1.68 | 9.89 | 11.35 | 0.9027 | 0.9677 | 1.1760 |
| NiK | 90.04 | 82.93 | 391.13 | 2.24 | 0.9084 | 0.9740 | 1.0328 |
| AlK | 6.95 | 13.98 | 42.15 | 10.15 | 0.8300 | 0.2287 | 1.0044 |
| MnK | 1.03 | 1.01 | 8.45 | 14.09 | 0.8917 | 0.9504 | 1.4664 |
| CoK | 2.01 | 1.85 | 10.31 | 11.61 | 0.9025 | 0.9675 | 1.1738 |
| NiK | 90.01 | 83.16 | 371.07 | 2.28 | 0.9082 | 0.9738 | 1.0328 |
TABLE 2 Intelligent quantitative result table for binary elements in the examples
Table 3 table of electrochemical performance measurement results of positive electrode material
It can be seen from the comparative data of the first example and the second example in table 3 that the coprecipitation reaction mode of intermittently and alternately adding the aluminum salt solution and the manganese salt solution adopted by the present invention has a higher capacity retention rate after 100 cycles compared to the coprecipitation reaction mode of continuously adding the aluminum salt solution and the manganese salt solution in the first comparative example. It can also be seen that the heat release of DSC of the former lithium ion battery after charging to 4.5V is lower than that of the latter, and the temperature of the strongest heat release peak is also higher than that of the latter, indicating that the cathode material of example one has a more stable crystal structure and good thermal stability, thereby improving the safety performance of the battery.
Claims (15)
1. The production method of the high-safety multi-element precursor comprises the following steps:
s1, mixing soluble nickel salt and soluble cobalt salt with deionized water to prepare a nickel-cobalt inorganic salt mixed solution with the metal ion concentration of 0.1-2 mol/L; preparing soluble manganese salt into a manganese salt solution with the metal ion concentration of 0.1-2 mol/L by using deionized water; preparing soluble aluminum salt into an aluminum salt solution with the metal ion concentration of 0.1-2 mol/L by using a NaOH solution;
s2, preparing a sodium hydroxide solution with the concentration of 3-15 mol/L and an ammonia water solution with the concentration of 5-10 mol/L;
s3, adopting a coprecipitation method for production, firstly determining the material flow ratio according to the product requirements, simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into a reaction kettle, after reacting for 1-4 h, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 2-4 h, then switching to injecting the aluminum salt solution for 1-4 h, and repeatedly switching according to the above until the product particle size meets the process requirements;
and S4, post-treating the slurry obtained by the reaction to obtain the high-safety multi-element precursor.
2. The high-safety multi-precursor production method according to claim 1, characterized in that: the coprecipitation method is selected from one of a continuous coprecipitation method, a batch coprecipitation method or a continuous-batch combined coprecipitation method.
3. The method for producing the high-safety multi-element precursor according to claim 1, wherein the step S3 is specifically: adding a required amount of base solution into a reaction kettle, introducing nitrogen for protection, heating and adding the ammonia water solution to adjust the ammonia value of the reaction base solution to be required by the process, adding the sodium hydroxide solution to adjust the pH to be required by the process after the reaction temperature is reached, then simultaneously injecting the nickel-cobalt inorganic salt mixed solution, the aluminum salt solution, the sodium hydroxide solution and the ammonia water solution into the reaction kettle after the material flow proportion is determined according to the product requirement, continuously introducing nitrogen, after reacting for 1-4 h, stopping injecting the aluminum salt solution, simultaneously switching to injecting the manganese salt solution for 2-4 h, then switching to injecting the aluminum salt solution for 1-4 h, and repeatedly switching according to the above steps until the product particle size reaches the process requirement.
4. The high-safety multi-precursor production method according to claim 1, characterized in that: the soluble nickel salt is selected from one or a mixture of any more of nickel sulfate, nickel nitrate, nickel carbonate and nickel acetate.
5. The high-safety multi-precursor production method according to claim 1, characterized in that: the soluble cobalt salt is selected from one or a mixture of any more of cobalt sulfate, cobalt nitrate, cobalt carbonate and cobalt acetate.
6. The high-safety multi-precursor production method according to claim 1, characterized in that: the soluble manganese salt is selected from one or a mixture of any more of manganese sulfate, manganese nitrate, manganese carbonate and manganese acetate.
7. The high-safety multi-precursor production method according to claim 1, characterized in that: the soluble aluminum salt is selected from one or a mixture of any more of aluminum sulfate, aluminum nitrate, aluminum carbonate and aluminum acetate.
8. The method for producing the high-safety multi-element precursor according to claim 1, wherein the step S4 is specifically: and (3) feeding the slurry generated by the reaction into a filtering device, pulping and washing the obtained filter cake with aqueous alkali of which the weight is 1-10 times that of the filter cake, washing the filter cake for a plurality of times with deionized water of which the weight is 1-10 times that of the filter cake, filtering to obtain a filter cake to be dried, and drying for 2-24 hours at the temperature of 100-150 ℃ to obtain the high-safety multi-element precursor.
9. A high-safety multi-component precursor obtained by the production method of the high-safety multi-component precursor according to any one of claims 1 to 8.
10. The high safety multiplex precursor according to claim 9, wherein: the molar ratio of the elements in the high-safety multi-element precursor is 87-95: 5-2: 5-1.
11. A preparation method of a positive electrode material is characterized by comprising the following steps: comprising the step of mixing the high-safety multi-element precursor of claim 9 with a lithium-containing compound and then sintering the mixture.
12. The method for producing a positive electrode material according to claim 11, characterized in that: the lithium-containing compound is selected from one or a mixture of any of lithium hydroxide, lithium carbonate, lithium acetate and lithium chloride.
13. A positive electrode material produced by the method for producing a positive electrode material according to claim 11 or 12.
14. A lithium ion battery, characterized by: the lithium ion battery comprises the positive electrode material of claim 13.
15. A vehicle, characterized in that: the vehicle includes the lithium ion battery of claim 14.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114408984A (en) * | 2021-12-31 | 2022-04-29 | 宜宾光原锂电材料有限公司 | Method for recycling mother liquor in precursor preparation process |
| CN114455642A (en) * | 2021-12-31 | 2022-05-10 | 宜宾光原锂电材料有限公司 | Preparation method of nano-pore precursor |
| CN114573047A (en) * | 2022-03-08 | 2022-06-03 | 宜宾光原锂电材料有限公司 | High-power NCM precursor and preparation method thereof |
| CN114709411A (en) * | 2022-03-30 | 2022-07-05 | 天能帅福得能源股份有限公司 | Multi-element positive electrode material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968202A (en) * | 2017-11-21 | 2018-04-27 | 宁波纳微新能源科技有限公司 | A kind of positive electrode of nickel cobalt manganese core shell structure containing aluminium and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968202A (en) * | 2017-11-21 | 2018-04-27 | 宁波纳微新能源科技有限公司 | A kind of positive electrode of nickel cobalt manganese core shell structure containing aluminium and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114408984A (en) * | 2021-12-31 | 2022-04-29 | 宜宾光原锂电材料有限公司 | Method for recycling mother liquor in precursor preparation process |
| CN114455642A (en) * | 2021-12-31 | 2022-05-10 | 宜宾光原锂电材料有限公司 | Preparation method of nano-pore precursor |
| CN114455642B (en) * | 2021-12-31 | 2023-07-07 | 宜宾光原锂电材料有限公司 | Method for preparing nano pore precursor |
| CN114573047A (en) * | 2022-03-08 | 2022-06-03 | 宜宾光原锂电材料有限公司 | High-power NCM precursor and preparation method thereof |
| CN114573047B (en) * | 2022-03-08 | 2023-07-11 | 宜宾光原锂电材料有限公司 | High-power NCM precursor and preparation method thereof |
| CN114709411A (en) * | 2022-03-30 | 2022-07-05 | 天能帅福得能源股份有限公司 | Multi-element positive electrode material and preparation method thereof |
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