CN115763768A - Sodium-ion battery positive electrode material and preparation method and application thereof - Google Patents
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Abstract
The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion battery positive electrode material and a preparation method and application thereof. The positive electrode material of the sodium-ion battery comprises a layered metal oxide and a modified polyanion compound coated on the surface of the layered metal oxide: the chemical general formula of the layered metal oxide is Na x Ni a Fe b Mn c M 1‑a‑b‑c O 2 (ii) a The chemical general formula of the modified polyanionic compound is NaFe (PO) 4 ) (3‑y)/3 F y @ C; m is transition goldThe metal element is doped with substituted elements, including one or more of Cu, mg, zr, ti, al, zn or W; x is more than 0.8 and less than or equal to 1, a is more than 0 and less than or equal to 0.5, b is more than 0 and less than or equal to 0.5, and c is more than 0 and less than or equal to 0.5; y is more than 0 and less than or equal to 0.2. The positive electrode material of the sodium-ion battery has the advantages of high working voltage and capacity, high air stability, difficulty in moisture absorption, high safety and long cycle life.
Description
Technical Field
The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion battery positive electrode material and a preparation method and application thereof.
Background
At present, due to the continuous rise of the price of lithium salt, the progress of the technology of the sodium ion battery is obvious, so that the sodium ion battery becomes a research hotspot, the industrialization process is also rapidly promoted, and the rapid application in the fields of energy storage and small power can be realized. The positive electrode material is an important component in a sodium ion battery, and at present, the sodium electric positive electrode material mainly comprises three technical routes of layered oxides, prussian blue and polyanions, wherein the layered oxides are most expected to realize rapid industrialization because the energy density and the compaction density are higher, and the layered oxides have a synthetic route similar to a ternary material of a lithium battery. However, the positive electrode material of the sodium-electric layered oxide has more defects, and at present, the air stability is poor, moisture is easy to absorb, and sodium is more active than lithium, so that the surface alkali residue of the sodium-electric layered oxide is more serious than that of the lithium battery.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One aspect of the invention relates to a positive electrode material of a sodium-ion battery, which comprises a layered metal oxide and a modified polyanion-type compound coated on the surface of the layered metal oxide:
the chemical general formula of the layered metal oxide is Na x Ni a Fe b Mn c M 1-a-b-c O 2 (ii) a The chemical general formula of the modified polyanion compound is NaFe (PO) 4 ) (3-y)/3 F y @C；
Wherein M is a doped and substituted element in the transition metal element, and comprises one or more of Cu, mg, zr, ti, al, zn or W; x is more than 0.8 and less than or equal to 1, a is more than 0 and less than or equal to 0.5, b is more than 0 and less than or equal to 0.5, and c is more than 0 and less than or equal to 0.5; y is more than 0 and less than or equal to 0.2.
The sodium ion battery anode material has the advantages of higher working voltage and capacity, high air stability, difficult moisture absorption, high safety and long cycle life.
The invention also relates to a preparation method of the positive electrode material of the sodium-ion battery, which comprises the following steps:
the layered metal oxide is mixed with a sodium source, an iron source, a carbon source, phosphate and a fluorine source, and then ball-milled and calcined.
The preparation method of the positive electrode material of the sodium-ion battery adopts solid-phase sintering, has simple process, is beneficial to industrial large-scale production, and has excellent performance.
The invention also relates to a positive pole piece which comprises the positive pole material of the sodium-ion battery.
In another aspect of the invention, the invention also relates to a sodium-ion battery, which comprises a positive pole piece of the sodium-ion battery.
Compared with the prior art, the invention has the beneficial effects that:
(1) The positive electrode material of the sodium-ion battery provided by the invention has the advantages of higher working voltage and capacity, high air stability, difficulty in moisture absorption, high safety and long cycle life; the surface of the enhanced layered metal oxide is coated with the modified polyanion compound, so that the stability of the interface of the enhanced layered metal oxide is enhanced; different from the method of adopting a passivation layer to coat to achieve interface stability in the prior art, the invention coats another sodium electric anode material NaFePO on the surface of the layered metal oxide 4 The material has good thermal stability, safety and cycle life, ensures the electrochemical activity of the surface, and is specific to the coated NaFePO 4 The problem of poor conductivity is also that carbon coating is carried out to improve the rate capability of the oxide, in addition, the working voltage and the capacity are improved through F doping, the interface layer can be stabilized through fluorine doping, the rate capability is improved, and the problem of high residual alkali on the surface of the layered oxide is well solved on the premise of not sacrificing the capacity.
(2) According to the preparation method of the sodium ion battery cathode material, a wet method is not adopted in the coating process, solid-phase sintering is directly adopted, the process is simple, industrial large-scale production is facilitated, and the prepared sodium ion battery cathode material has excellent performance.
Detailed Description
While the technical solutions of the present invention will be described clearly and completely with reference to the specific embodiments, those skilled in the art will understand that the following described examples are some, but not all, examples of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
One aspect of the invention relates to a positive electrode material of a sodium-ion battery, which comprises a layered metal oxide and a modified polyanion compound coated on the surface of the layered metal oxide:
the chemical general formula of the layered metal oxide is Na x Ni a Fe b Mn c M 1-a-b-c O 2 (ii) a The chemical general formula of the modified polyanion compound is NaFe (PO) 4 ) (3-y)/3 F y @C；
Wherein M is a doped and substituted element in the transition metal element, and comprises one or more of Cu, mg, zr, ti, al, zn or W; x is more than 0.8 and less than or equal to 1, a is more than 0 and less than or equal to 0.5, b is more than 0 and less than or equal to 0.5, and c is more than 0 and less than or equal to 0.5; y is more than 0 and less than or equal to 0.2. The values of x, a, b and c satisfy the charge balance of the chemical formula.
The problem of high residual alkali of the existing layered metal oxide is effectively improved, and the stability in the air is enhanced; the layered metal oxide is coated by the method, so that the layered metal oxide has higher capacity, the coated substance is a carbon-coated fluorine-doped sodium iron phosphate material, the electrochemical activity of the surface is ensured, the carbon coating is beneficial to improving the conductivity, and the fluorine doping can stabilize an interface layer and improve the rate capability.
The layered metal oxide has high capacity and is expected to be industrialized firstly, but the interface is extremely unstable, high residual alkali is generated on the surface, andthe invention adopts a coating technology to enhance the interface stability. With an existing passivation layer (e.g. Al) 2 O 3 The method for achieving interface stability by coating with metal oxide or common phosphate is different, and the invention coats another sodium electric anode material NaFePO on the surface of the layered transition metal oxide 4 The material has good thermal stability, safety and cycle life, and is directed to coated NaFePO 4 The problem of poor conductivity is also subjected to carbon coating, the multiplying power performance of the composite oxide is improved, in addition, the working voltage and the capacity are improved through F doping, and the problem of high residual alkali on the surface of the layered oxide is well improved on the premise of not sacrificing the capacity.
Preferably, in the modified polyanionic compound, the mass of C is 0.01wt% to 2wt% (e.g., 0.01wt%, 0.05wt%, 0.1wt%, 0.3wt%, 0.5wt%, 0.7wt%, 0.9wt%, 1.3wt%, 1.5wt%, 1.7wt%, 1.9wt%, or 2 wt%) of the modified polyanionic compound.
Preferably, the mass of the modified polyanionic compound is 1wt% to 10wt% (e.g., 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, or 10 wt%) of the sodium-ion battery positive electrode material.
The invention also relates to a preparation method of the positive electrode material of the sodium-ion battery, which comprises the following steps:
the layered metal oxide is mixed with a sodium source, an iron source, a carbon source, phosphate and a fluorine source, and then ball-milled and calcined.
Preferably, the ball mill has a rotational speed of 200 to 500rpm/min (e.g., 200rpm/min, 220rpm/min, 240rpm/min, 260rpm/min, 280rpm/min, 300rpm/min, 320rpm/min, 340rpm/min, 360rpm/min, 380rpm/min, 400rpm/min, 420rpm/min, 440rpm/min, 460rpm/min, 480rpm/min, or 500 rpm/min).
Preferably, the ball milling time is 2 to 8 hours (e.g., 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, or 8 hours).
Preferably, the temperature of the calcination is 500 to 900 ℃ (e.g., 500 ℃, 520 ℃, 540 ℃, 560 ℃, 580 ℃, 600 ℃, 620 ℃, 640 ℃, 660 ℃, 680 ℃, 700 ℃, 720 ℃, 740 ℃, 760 ℃, 780 ℃, 800 ℃, 820 ℃, 840 ℃, 860 ℃, 880 ℃, or 900 ℃).
Preferably, the calcination is carried out for a time of 6 to 12h (e.g. 6h, 7h, 8h, 9h, 10h, 11h or 12 h).
Preferably, the sintering atmosphere of the calcination comprises nitrogen.
Preferably, the sodium source comprises: at least one of sodium carbonate, sodium bicarbonate, sodium hydroxide, or sodium sulfate.
Preferably, the iron source comprises: iron oxalate dihydrate (FeC) 2 O 4 ·H 2 O), ferrous phosphate (FePO) 4 ) Or ferrous sulfate.
Preferably, the carbon source comprises: at least one of glucose, sucrose or fructose.
Preferably, the phosphate salt comprises: ammonium dihydrogen phosphate (NH) 4 H 2 PO 4 ) Diammonium hydrogen phosphate ((NH) 4 ) 2 HPO 4 ) Or ammonium phosphates ((NH) 4 ) 3 PO 4 ) At least one of (1).
Preferably, the fluorine source comprises: at least one of sodium fluoride, ferric fluoride, or ferrous fluoride.
The invention also relates to a positive pole piece which comprises the positive pole material of the sodium-ion battery.
In another aspect of the invention, the invention also relates to a sodium-ion battery, which comprises the positive pole piece of the sodium-ion battery.
Embodiments of the present invention will be described in detail below with reference to specific examples and comparative examples.
Example 1
The positive electrode material for sodium ion batteries provided by the embodiment has a structure with a layered metal oxide as a core and a carbon-coated and fluorine-doped sodium iron phosphate material as a shell, and the expression of the material is NaNi 1/3 Fe 1/3 Mn 1/3 O 2 @NaFe(PO 4 ) 0.96 F 0.1 @C；
Wherein, the mass percentage of the sodium ferric phosphate shell layer structure oxide in the layered metal oxide is 5%.
In this example, the layered metal oxide is sodium nickel iron manganese (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )；
The sodium source is sodium carbonate;
the iron source is ferrous oxalate dihydrate;
the phosphate is ammonium dihydrogen phosphate;
the fluorine source is sodium fluoride;
the carbon source is glucose;
the preparation method comprises the following steps:
1. 10g of NaNi are taken 1/3 Fe 1/3 Mn 1/3 O 2 The anode material is prepared by sequentially weighing and mixing 0.16g of sodium carbonate, 0.35g of ammonium dihydrogen phosphate, 0.5g of ferrous oxalate dihydrate, 0.012g of sodium fluoride and 0.25g of glucose;
2. ball milling is carried out after uniform mixing, and the rotating speed is maintained for 5 hours at 300 rpm/min;
3. and then transferring the anode material to nitrogen atmosphere at 700 ℃ for calcining for 8h to obtain the coated and modified sodium ion battery anode material.
Example 2
The sodium ion battery cathode material provided by the embodiment has a structure with a layered oxide material as a core and a carbon-coated and fluorine-doped sodium iron phosphate material as a shell, and the expression of the material is NaNi 1/3 Fe 1/3 Mn 1/3 O 2 @NaFe(PO 4 ) 0.96 F 0.1 @C；
Wherein, the mass percentage of the sodium ferric phosphate shell layer structure oxide in the layered metal oxide is 1%;
in this example, the layered metal oxide was sodium nickel iron manganese (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )；
The sodium source is sodium carbonate;
the iron source is ferrous oxalate dihydrate;
the phosphate is ammonium dihydrogen phosphate;
the fluorine source is sodium fluoride;
the carbon source is glucose;
the preparation method comprises the following steps:
1. 10g of NaNi was taken 1/3 Fe 1/3 Mn 1/3 O 2 The anode material is prepared by sequentially weighing and mixing 0.032g of sodium carbonate, 0.07g of ammonium dihydrogen phosphate, 0.1g of ferrous oxalate dihydrate, 0.0024g of sodium fluoride and 0.25g of glucose;
2. ball milling is carried out after uniform mixing, and the rotating speed is maintained for 5 hours at 300 rpm/min;
3. and then transferring the anode material to nitrogen atmosphere at 700 ℃ for calcining for 8h to obtain the coated and modified sodium ion battery anode material.
Example 3
The sodium ion battery cathode material provided by the embodiment has a structure with a layered oxide material as a core and a carbon-coated and fluorine-doped sodium iron phosphate material as a shell, and the expression of the material is NaNi 1/3 Fe 1/3 Mn 1/3 O 2 @NaFe(PO 4 ) 0.96 F 0.1 @C；
Wherein, the sodium ferric phosphate shell layer structure oxide accounts for 10 percent of the mass of the layered transition metal oxide;
in this example, the layered oxide is sodium nickel iron manganese (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )；
The sodium source is sodium carbonate;
the iron source is ferrous oxalate dihydrate;
the phosphate is ammonium dihydrogen phosphate;
the fluorine source is sodium fluoride;
the carbon source is glucose;
the preparation method comprises the following steps:
1. 10g of NaNi are taken 1/3 Fe 1/3 Mn 1/3 O 2 Sequentially weighing and mixing 0.064g of sodium carbonate, 0.7g of ammonium dihydrogen phosphate, 1.0g of ferrous oxalate dihydrate, 0.024g of sodium fluoride and 0.25g of glucose;
2. ball milling is carried out after the mixture is evenly mixed, and the rotating speed is maintained for 5 hours at 300 rpm/min;
3. and then transferring to nitrogen atmosphere to calcine for 8h at 700 ℃ to obtain the coated modified sodium-ion battery anode material.
Example 4
The sodium ion battery positive electrode material provided by the embodiment has a structure with a layered metal oxide as a core and a carbon-coated and fluorine-doped sodium iron phosphate material as a shell, and the expression of the material is NaNi 1/3 Fe 1/3 Mn 1/3 O 2 @NaFe(PO 4 ) 0.96 F 0.1 @C；
Wherein, the sodium ferric phosphate shell layer structure oxide accounts for 5 percent of the mass of the layered metal oxide.
In this example, the layered metal oxide was sodium nickel iron manganese (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )；
The sodium source is sodium carbonate;
the iron source is ferrous oxalate dihydrate;
the phosphate is ammonium dihydrogen phosphate;
the fluorine source is sodium fluoride;
the carbon source is glucose;
the preparation method comprises the following steps:
1. 10g of NaNi are taken 1/3 Fe 1/3 Mn 1/3 O 2 The anode material is prepared by sequentially weighing and mixing 0.16g of sodium carbonate, 0.35g of ammonium dihydrogen phosphate, 0.5g of ferrous oxalate dihydrate, 0.012g of sodium fluoride and 0.25g of glucose;
2. ball milling is carried out after uniform mixing, and the rotating speed is maintained for 8 hours at 200 rpm/min;
3. and then transferring the mixture to nitrogen atmosphere at 900 ℃ for calcining for 6 hours to obtain the coated and modified sodium ion battery anode material.
Example 5
The sodium ion battery positive electrode material provided by the embodiment has a structure with a layered metal oxide as a core and a carbon-coated and fluorine-doped sodium iron phosphate material as a shell, and the expression of the material is NaNi 1/3 Fe 1/3 Mn 1/3 O 2 @NaFe(PO 4 ) 0.96 F 0.1 @C；
Wherein, the sodium ferric phosphate shell layer structure oxide accounts for 5 percent of the mass of the layered metal oxide.
The true bookIn the examples, the layered metal oxide is sodium nickel iron manganese (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )；
The sodium source is sodium carbonate;
the iron source is ferrous oxalate dihydrate;
the phosphate is ammonium dihydrogen phosphate;
the fluorine source is sodium fluoride;
the carbon source is glucose;
the preparation method comprises the following steps:
1. 10g of NaNi are taken 1/3 Fe 1/3 Mn 1/3 O 2 The anode material is prepared by sequentially weighing and mixing 0.16g of sodium carbonate, 0.35g of ammonium dihydrogen phosphate, 0.5g of ferrous oxalate dihydrate, 0.012g of sodium fluoride and 0.25g of glucose;
2. ball milling is carried out after uniform mixing, and the rotating speed is maintained for 2 hours at 500rpm/min;
3. and then transferring to nitrogen atmosphere, calcining at 500 ℃ for 12h to obtain the coated modified sodium-ion battery positive electrode material.
Comparative example 1
The preparation method of the positive electrode material of the sodium-ion battery provided by the comparative example comprises the following steps:
1. 10g of NaNi are taken 1/3 Fe 1/3 Mn 1/3 O 2 The anode material is prepared by sequentially weighing and mixing 0.16g of sodium carbonate, 0.35g of ammonium dihydrogen phosphate, 0.5g of ferrous oxalate dihydrate and 0.25g of glucose;
2. ball milling is carried out after the mixture is evenly mixed, and the rotating speed is maintained for 5 hours at 300 rpm/min;
3. and then transferring to nitrogen atmosphere to calcine for 8h at 700 ℃ to obtain the coated modified sodium-ion battery anode material.
Comparative example 2
The preparation method of the positive electrode material of the sodium-ion battery provided by the comparative example comprises the following steps:
1. 10g of NaNi was taken 1/3 Fe 1/3 Mn 1/3 O 2 The positive electrode material is prepared by sequentially weighing and mixing 0.16g of sodium carbonate, 0.35g of ammonium dihydrogen phosphate, 0.5g of ferrous oxalate dihydrate and 0.012g of sodium fluoride;
2. ball milling is carried out after the mixture is evenly mixed, and the rotating speed is maintained for 5 hours at 300 rpm/min;
3. and then transferring to nitrogen atmosphere to calcine for 8h at 700 ℃ to obtain the coated modified sodium-ion battery anode material.
Comparative example 3
Sodium nickel iron manganese acid (NaNi) 1/3 Fe 1/3 Mn 1/3 O 2 )。
Comparative example 4
This comparative example differs from example 1 only in that the rotational speed of the ball mill was 600rpm/min.
Comparative example 5
The comparative example differs from example 1 only in that the calcination temperature is 450 ℃.
Examples of the experiments
The material prepared by the experiment is placed for 5 hours in a 20% humidity environment, then the moisture and residual alkali test is carried out, the stability of the material is measured, and the fresh anode material is assembled into a button cell which is charged and discharged at 0.1C in a 2.0V-4.0V range, and the electrochemical performance is compared. The results are shown in Table 1.
TABLE 1
| Experiment number | Water content ppm | Residual alkali% | Discharge capacity mAh/g |
| Example 1 | 386 | 0.83 | 135.6 |
| Example 2 | 670 | 1.07 | 136.9 |
| Example 3 | 359 | 0.80 | 125.8 |
| Example 4 | 851 | 1.36 | 133.7 |
| Example 5 | 613 | 0.98 | 134.4 |
| Comparative example 1 | 1335 | 4.29 | 133.2 |
| Comparative example 2 | 348 | 0.95 | 134.9 |
| Comparative example 3 | 2470 | 6.32 | 137.5 |
| Comparative example 4 | 385 | 0.90 | 134.8 |
| Comparative example 5 | 840 | 2.17 | 137.4 |
As shown in the above table, comparing examples 1, 2, 3 and 3, it is found that the stability of the sodium electrical layered oxide positive electrode material in the air can be effectively improved by coating modification, the moisture absorption of the surface is inhibited, and the content of residual alkali on the surface is reduced; comparing example 1 with comparative example 1, it is found that the doping of F can effectively stabilize the interface and improve partial capacity; comparing examples 1, 4 and 5 with comparative examples 4 and 5, the coating temperature is suitably 700 ℃, the performance is weakened when the temperature is too high or too low, and the ball milling speed is 300rpm, so that better dispersion can be achieved. By comparison of experimental data, example 1 is a better air stability, relatively low moisture to residual alkali, and after coating modification, the gram volume is not lost much compared to the uncoated material of comparative example 3, thus having a better overall performance.
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the above embodiments are merely illustrative of the technical solution of the present invention and are not restrictive; those of ordinary skill in the art will understand that: modifications may be made to the above-described embodiments, or equivalents may be substituted for some or all of the features thereof without departing from the spirit and scope of the present invention; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention; it is therefore intended to cover in the appended claims all such alternatives and modifications that are within the scope of the invention.
Claims (10)
1. A positive electrode material of a sodium-ion battery is characterized by comprising a layered metal oxide and a modified polyanion-type compound coated on the surface of the layered metal oxide:
the chemical general formula of the layered metal oxide is Na x Ni a Fe b Mn c M 1-a-b-c O 2 (ii) a The chemical general formula of the modified polyanion compound is NaFe (PO) 4 ) (3-y)/3 F y @C；
Wherein M is a doped and substituted element in the transition metal element, and comprises one or more of Cu, mg, zr, ti, al, zn or W; x is more than 0.8 and less than or equal to 1, a is more than 0 and less than or equal to 0.5, b is more than 0 and less than or equal to 0.5, and c is more than 0 and less than or equal to 0.5; y is more than 0 and less than or equal to 0.2.
2. The positive electrode material for a sodium-ion battery according to claim 1, wherein the mass of C in the modified polyanionic compound is 0.01 to 2wt% of the modified polyanionic compound.
3. The positive electrode material for sodium-ion batteries according to claim 1, wherein the mass of the modified polyanionic compound is 1 to 10wt% of the positive electrode material for sodium-ion batteries.
4. The method for preparing the positive electrode material for the sodium-ion battery according to any one of claims 1 to 3, comprising the steps of:
the layered metal oxide is mixed with a sodium source, an iron source, a carbon source, phosphate and a fluorine source, and then ball-milled and calcined.
5. The preparation method of the positive electrode material of the sodium-ion battery according to claim 4, wherein the rotation speed of the ball mill is 200-500 rpm/min;
preferably, the ball milling time is 2 to 8 hours.
6. The method for preparing the positive electrode material of the sodium-ion battery according to claim 4, wherein the calcining temperature is 500-900 ℃;
preferably, the calcining time is 6-12 h;
preferably, the sintering atmosphere of the calcination comprises nitrogen.
7. The method of claim 4, wherein the sodium source comprises: at least one of sodium carbonate, sodium bicarbonate, sodium hydroxide, or sodium sulfate;
preferably, the iron source comprises: at least one of ferrous oxalate dihydrate, ferrous phosphate or ferrous sulfate.
8. The method for preparing the positive electrode material for sodium-ion batteries according to claim 4, wherein the carbon source comprises: at least one of glucose, sucrose or fructose;
preferably, the phosphate comprises: at least one of monoammonium phosphate, diammonium phosphate, or ammonium phosphate;
preferably, the fluorine source comprises: at least one of sodium fluoride, ferric fluoride, or ferrous fluoride.
9. A positive electrode sheet comprising the positive electrode material for sodium-ion batteries according to any one of claims 1 to 3.
10. A sodium-ion battery comprising the positive electrode sheet of claim 9.
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| CN117276551B (en) * | 2023-11-23 | 2024-03-19 | 兰钧新能源科技有限公司 | Sodium-electricity layered oxide positive electrode material, preparation method thereof and sodium-ion battery |
| CN117352708A (en) * | 2023-12-05 | 2024-01-05 | 浙江帕瓦新能源股份有限公司 | Double-layer coated modified polyanion type sodium-electricity positive electrode material and preparation method thereof |
| CN117352708B (en) * | 2023-12-05 | 2024-03-15 | 浙江帕瓦新能源股份有限公司 | Double-layer coated modified polyanion type sodium-electricity positive electrode material and preparation method thereof |
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