CN115172709A - High-performance strontium-doped ternary sodium-ion battery positive electrode material and preparation method thereof - Google Patents
High-performance strontium-doped ternary sodium-ion battery positive electrode material and preparation method thereof Download PDFInfo
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 51
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000007774 positive electrode material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 33
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011734 sodium Substances 0.000 claims abstract description 26
- 239000011572 manganese Substances 0.000 claims abstract description 21
- 238000001354 calcination Methods 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 239000006185 dispersion Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 13
- 239000010405 anode material Substances 0.000 claims abstract description 12
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 6
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 12
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims description 6
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 6
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 229910000018 strontium carbonate Inorganic materials 0.000 claims description 6
- 238000001694 spray drying Methods 0.000 claims description 2
- 150000003438 strontium compounds Chemical class 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 108010052164 Sodium Channels Proteins 0.000 abstract description 2
- 102000018674 Sodium Channels Human genes 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 abstract description 2
- 238000009831 deintercalation Methods 0.000 abstract 1
- 229910021645 metal ion Inorganic materials 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 229910001427 strontium ion Inorganic materials 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910021314 NaFeO 2 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- PWYYWQHXAPXYMF-UHFFFAOYSA-N strontium(2+) Chemical compound [Sr+2] PWYYWQHXAPXYMF-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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- C—CHEMISTRY; METALLURGY
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Abstract
The invention discloses a high-performance strontium-doped ternary sodium-ion battery positive electrode material and a preparation method thereof. The chemical general formula of the anode material is Na 1‑x Sr x [Ni 1‑y‑z Mn y Fe z ]O 2 Wherein x is more than 0 and less than or equal to 0.04,0 and more than or equal to 1,0 and more than or equal to z is less than or equal to 1. The preparation method comprises the following steps: dispersing sodium-containing compound, nickel-containing compound, manganese-containing compound, iron-containing compound and strontium-containing compound in ionized water to obtain componentDispersing; stirring and grinding the dispersion liquid, and drying to obtain powder; calcining the obtained powder. According to the invention, strontium metal ions are doped to replace sodium sites, so that sodium ion channels are expanded, a layered structure is stabilized, and structural breakage caused by volume change in the process of sodium ion deintercalation is reduced. The prepared anode material can effectively improve the cycling stability and the discharge specific capacity of the sodium-ion battery, and the preparation process is simple and has high repeatability.
Description
Technical Field
The invention relates to a high-performance strontium-doped ternary sodium-ion battery positive electrode material and a preparation method thereof, belonging to the technical field of sodium-ion batteries.
Background
With the vigorous development and use of clean and renewable energy sources in various countries of the world, higher requirements are also put forward on large-scale energy storage systems. Currently, lithium ion batteries widely used in the 3C and electric automobile fields are the first candidates. However, lithium resources are unevenly distributed and low in abundance, so that the price of lithium salts such as lithium carbonate and lithium hydroxide is dramatically increased in recent years. Although lithium ion batteries can meet the requirements of large-scale energy storage systems on energy density, the cost problem becomes a big obstacle. The sodium ion battery and the lithium ion battery have similar working principles, are rich in sodium reserves and low in cost, are battery systems with great development potential, and are suitable for large-scale energy storage systems.
The electrode material of the sodium ion battery has a great influence on the performance of the sodium ion battery, and the defects of the positive electrode material, such as low capacity, poor cycle performance and low energy density, are obvious compared with the negative electrode material. The method is particularly important for searching and modifying a new positive electrode material with higher energy density, better cycle performance and high capacity. The cost and the electrochemical performance of the sodium-ion battery are mainly determined by the anode material of the sodium-ion battery, the anode material accounts for about 26% of the cost, and the development of the anode material of the sodium-ion battery is significant in order to obtain the high-efficiency, recyclable, non-toxic and harmless sodium-ion battery.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problems of poor stability and poor cycle performance are generally existed in the layered sodium-ion battery.
In order to solve the technical problem, the invention provides a high-performance strontium-doped ternary sodium-ion battery positive electrode material, wherein the chemical general formula of the high-performance strontium-doped ternary sodium-ion battery positive electrode material is Na 1-x Sr x [Ni 1-y-z Mn y Fe z ]O 2 Wherein x is more than 0 and less than or equal to 0.04,0 and more than or equal to 1,0 and more than z and less than or equal to 1.
The invention also provides a preparation method of the high-performance strontium-doped ternary sodium-ion battery anode material, which comprises the following steps:
step 1): weighing a sodium-containing compound, a nickel-containing compound, a manganese-containing compound, an iron-containing compound and a strontium-containing compound according to a proportion, and dispersing in ionized water to obtain a dispersion liquid;
step 2): stirring and grinding the dispersion liquid, and drying to obtain powder;
step 3): calcining the powder obtained in the step 2) to obtain the high-performance strontium-doped ternary sodium ion anode material.
Preferably, the sodium-containing compound in step 1) is sodium carbonate, the nickel-containing compound is nickel oxide, the manganese-containing compound is manganese oxide, the iron-containing compound is iron oxide, and the strontium-containing compound is strontium carbonate.
Preferably, the weight ratio of the sodium-containing compound, the nickel-containing compound, the manganese-containing compound, the iron-containing compound and the strontium compound in the step 1) is 161-166: 50-60: 90-110: 55 to 70:4 to 16.
Preferably, the solid content of the dispersion obtained in step 1) is 30-40 wt%.
Preferably, the grinding in the step 2) adopts a ball mill, and the rotation speed of the ball mill is 2500r/min.
Preferably, the drying in step 2) is spray drying.
Preferably, the calcination in step 3) is calcination in an air atmosphere in a tube furnace.
Preferably, the calcination in step 3) is specifically: calcining at 850-950 deg.c for 10-12 hr.
The invention also provides application of the high-performance strontium-doped ternary sodium-ion battery positive electrode material in a sodium-ion battery.
Ternary material Na 1-x Sr x [Ni 1-y-z Mn y Fe z ]O 2 Ni, fe, mn in the material have different functions. Generally, it is thought that increasing the content of Mn element in the material can increase the structural stability of the material, and increasing the content of Ni element can increase the specific discharge capacity. Through doping modification, the ternary sodium-ion battery can keep the stability of the structure while having higher specific discharge capacity.
Compared with the prior art, the invention has the beneficial effects that: the high-performance strontium-doped ternary sodium-ion battery positive electrode material is prepared by doping Sr to form a chemical general formula of Na 1-x Sr x [Ni 1-y-z Mn y Fe z ]O 2 The positive electrode material has larger strontium ion radius, can effectively expand a sodium ion channel, is beneficial to improving the diffusion capacity of sodium ions, increasing the ion migration rate and improving the electrochemical performance of the positive electrode material; thereby effectively improving the positive cycling stability and the specific discharge capacity of the corresponding sodium-ion battery.
Drawings
FIG. 1 is an X-ray diffraction pattern of the high performance strontium-doped ternary sodium-ion battery positive electrode material prepared in example 1;
fig. 2 is a graph showing the first charge and discharge curves of the high-performance strontium-doped ternary sodium-ion battery positive electrode material prepared in example 1 (charge and discharge start and stop voltages are 1.75-4.4v, 0.1c rate, 1c =170ma/g);
fig. 3 is a graph of cycle performance of the high-performance strontium-doped ternary sodium-ion battery positive electrode material prepared in example 1 (charge-discharge start-stop voltage is 1.75-4.4 v,1c rate, 1c =170ma/g);
fig. 4 is an XRD refinement graph of the high-performance strontium-doped ternary sodium-ion battery cathode material prepared in example 1.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
A preparation method of a high-performance strontium-doped ternary sodium-ion battery positive electrode material comprises the following steps:
(1) Sodium carbonate, nickel oxide, iron oxide, manganese oxide and strontium carbonate are used as raw materials, and the weight ratio of the raw materials is 166:56:107:60:4;
(2) Dispersing the raw materials in deionized water, adjusting the solid content in the dispersion liquid to 40%, adding the dispersion liquid into a ball mill for grinding, adjusting the grinding speed to 2500r/min, and keeping the low-temperature state in the grinding process;
(3) The ball-milled solution is utilized to obtain uniform powder by a spray dryer, and a small amount of the powder is compacted and then is placed in a tube furnace for calcination;
(4) During calcination, the sintering temperature is 900 ℃, and the temperature is kept for 12h to obtain the strontium-doped ternary sodium-ion battery anode material Na 0.99 Sr 0.01 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
The obtained material was subjected to phase detection using X-ray diffractometer (XRD, rigaku, japan), and as shown in FIG. 1, the diffraction pattern was refined by software (EXPGUI) to confirm that the material had a space group of R3m in alpha-NaFeO 2 The structure is corresponding and no obvious impurity peak exists, so that the occupancy of strontium ions at the sodium position is determined, and the obtained material is verified to be Na according to the raw material proportion 0.99 Sr 0.01 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
And (3) performance testing:
the high-performance strontium-doped ternary sodium ion positive electrode material prepared in example 1 is used in a sodium ion battery to perform a cyclic charge and discharge performance test, the first charge and discharge performance curve is shown in fig. 2, the first charge voltage is 4.4V, the discharge voltage is 1.75V, the first discharge specific capacity is 158.8mAh/g, the cyclic charge and discharge performance curve is shown in fig. 3, the first-cycle discharge specific capacity is 121.8mAh/g under the 1C multiplying power, after 100-cycle charge and discharge first cycles, the discharge specific capacity is 96.8mAh/g, the discharge specific capacity of the battery is only reduced by 25mAh/g, the cycle retention rate is 80%, and the cycle stability of the positive electrode material is good.
Example 2
A preparation method of a high-performance strontium-doped ternary sodium-ion battery positive electrode material comprises the following steps:
(1) Sodium carbonate, nickel oxide, iron oxide, manganese oxide and strontium carbonate are used as raw materials, and the weight ratio of the raw materials is 164:56:107:60:8;
(2) Dispersing the raw materials in deionized water, adjusting the solid content in the dispersion liquid to 40%, adding the dispersion liquid into a ball mill for grinding, adjusting the grinding speed to 2500r/min, and keeping the low-temperature state in the grinding process;
(3) The ball-milled solution is utilized to obtain uniform powder by a spray dryer, and a small amount of the powder is compacted and then is placed in a tube furnace for calcination;
(4) During calcination, the sintering temperature is 900 ℃, and the temperature is kept for 12h to obtain the strontium-doped ternary sodium-ion battery anode material Na 0.98 Sr 0.02 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
The phase detection of the obtained material is carried out by utilizing an X-ray diffractometer (XRD, rigaku of Japan), and the diffraction spectrogram is refined by software (EXPGUI) to confirm that the diffraction spectrum is equal to the alpha-NaFeO of the space group R3m 2 The structure is corresponding and no obvious impurity peak exists, so that the occupancy of strontium ions at the sodium position is determined, and the obtained material is verified to be Na according to the raw material proportion 0.98 Sr 0.02 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
Example 3
A preparation method of a high-performance strontium-doped ternary sodium-ion battery positive electrode material comprises the following steps:
(1) Sodium carbonate, nickel oxide, iron oxide, manganese oxide and strontium carbonate are used as raw materials, and the weight ratio of the raw materials is 163:56:107:60:12;
(2) Dispersing the raw materials in deionized water, adjusting the solid content in the dispersion liquid to 40%, adding the dispersion liquid into a ball mill for grinding, adjusting the grinding speed to 2500r/min, and keeping the low-temperature state in the grinding process;
(3) The ball-milled solution is utilized to obtain uniform powder by a spray dryer, and a small amount of the powder is compacted and then is placed in a tube furnace for calcination;
(4) During calcination, the sintering temperature is 900 ℃, and the temperature is kept for 12h to obtain the strontium-doped ternary sodium-ion battery anode material Na 0.97 Sr 0.03 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
The phase detection of the obtained material is carried out by utilizing an X-ray diffractometer (XRD, rigaku of Japan), and the diffraction spectrogram is refined by software (EXPGUI) to confirm that the diffraction spectrum is equal to the alpha-NaFeO of the space group R3m 2 The structure is corresponding and no obvious impurity peak exists, so that the occupancy of strontium ions at the sodium position is determined, and the obtained material is verified to be Na according to the raw material proportion 0.97 Sr 0.03 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
Example 4
A preparation method of a high-performance strontium-doped ternary sodium-ion battery positive electrode material comprises the following steps:
(1) Sodium carbonate, nickel oxide, iron oxide, manganese oxide and strontium carbonate are used as raw materials, and the weight ratio of the raw materials is 161:56:107:60:16;
(2) Dispersing the raw materials in deionized water, adjusting the solid content in the dispersion liquid to 40%, adding the dispersion liquid into a ball mill for grinding, adjusting the grinding speed to 2500r/min, and keeping the low-temperature state in the grinding process;
(3) The ball-milled solution is utilized to obtain uniform powder by a spray dryer, a small amount of the powder is compacted and then placed in a tube furnace to be calcined by introducing oxygen;
(4) During calcination, the sintering temperature is 900 ℃, and the temperature is kept for 12h to obtain the strontium-doped ternary sodium-ion battery anode material Na 0.96 Sr 0.04 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
The phase detection of the obtained material is carried out by utilizing an X-ray diffractometer (XRD, rigaku of Japan), and the diffraction spectrogram is refined by software (EXPGUI) to confirm that the diffraction spectrum is equal to the alpha-NaFeO of the space group R3m 2 The structure is corresponding and no obvious impurity peak exists, so that the occupancy of strontium ions at the sodium position is determined, and the obtained material is verified to be Na according to the raw material proportion 0.96 Sr 0.04 [Ni 0.25 Mn 0.5 Fe 0.25 ]O 2 。
Claims (10)
1. The high-performance strontium-doped ternary sodium-ion battery positive electrode material is characterized in that the chemical general formula is Na 1-x Sr x [Ni 1-y-z Mn y Fe z ]O 2 Wherein x is more than 0 and less than or equal to 0.04,0 and more than or equal to 1,0 and more than or equal to z is less than or equal to 1.
2. The preparation method of the high-performance strontium-doped ternary sodium-ion battery positive electrode material of claim 1, characterized by comprising the following steps:
step 1): weighing a sodium-containing compound, a nickel-containing compound, a manganese-containing compound, an iron-containing compound and a strontium-containing compound according to a proportion, and dispersing in ionized water to obtain a dispersion liquid;
step 2): stirring and grinding the dispersion liquid, and drying to obtain powder;
step 3): calcining the powder obtained in the step 2) to obtain the high-performance strontium-doped ternary sodium ion anode material.
3. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the sodium-containing compound in the step 1) is sodium carbonate, the nickel-containing compound is nickel oxide, the manganese-containing compound is manganese oxide, the iron-containing compound is iron oxide, and the strontium-containing compound is strontium carbonate.
4. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the weight ratio of the sodium-containing compound, the nickel-containing compound, the manganese-containing compound, the iron-containing compound and the strontium compound in the step 1) is 161-166: 50-60: 90-110: 55 to 70:4 to 16.
5. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the solid content in the dispersion liquid obtained in the step 1) is 30-40 wt%.
6. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the grinding in the step 2) is carried out by using a ball mill, and the grinding speed of the ball mill is 2500r/min.
7. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the drying in the step 2) is spray drying.
8. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2, wherein the calcination in the step 3) is calcination in a tube furnace in an air atmosphere.
9. The method for preparing the high-performance strontium-doped ternary sodium-ion battery positive electrode material as claimed in claim 2 or 8, wherein the calcination in the step 3) is specifically as follows: calcining at 850-950 deg.c for 10-12 hr.
10. The use of the high-performance strontium-doped ternary sodium-ion battery positive electrode material of claim 1 in a sodium-ion battery.
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