Vanadium-based solid solution hydrogen storage alloy and preparation method thereof

Abstract

The invention discloses a vanadium-based solid solution hydrogen storage alloy and a preparation method thereof, and relates to the field of vanadium-based solid solution hydrogen storage alloys, and the vanadium-based solid solution hydrogen storage alloy is prepared according to the following molecular formula: 7.5-8.5% of V, 0.4-0.6% of Ti, 0.7-0.9% of Cr, 1.0-1.4% of Fe, 0.25-0.35% of Al, and 0.45-0.55% of Mn. According to the preparation method, Mn powder is laid at the bottom of a crucible in advance, a gradient diffusion path of Mn-V-Fe-Ti is formed in the magnetic stirring process, and generation of a nanoscale V-Ti core-shell structure is induced; the first smelting temperature is increased to 1850 + / -50 DEG C, step cooling is adopted in the subsequent smelting stage, and magnetic stirring frequency gradient increasing is matched; the grain size is finer, and the crystal face proportion is improved.

Description

Technical Field

[0001] The present invention relates to the field of preparation of vanadium-based solid solution hydrogen storage alloys, and in particular to a vanadium-based solid solution hydrogen storage alloy and a preparation method thereof. Background Art

[0002] Vanadium-based solid solution hydrogen storage alloys are solid solution alloys formed by vanadium (V) and other metals (such as Ti, Cr, Fe, and Al). They store and release hydrogen through physical or chemical reactions. These materials have become a research hotspot in the field of hydrogen energy storage and transportation due to their high hydrogen storage density, room-temperature hydrogen absorption and desorption capabilities, and cost advantages.

[0003] However, conventional preparation methods usually involve uniformly mixing metal materials and then smelting them, and the resulting crystal surface area and room temperature hydrogen absorption capacity need to be improved.

[0004] Therefore, it is necessary to propose a vanadium-based solid solution hydrogen storage alloy and a preparation method thereof to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a vanadium-based solid solution hydrogen storage alloy and a preparation method thereof, so as to solve the problem that the conventional preparation method usually involves uniformly mixing metal materials and then smelting them, resulting in the formation of crystal planes with a large area and room temperature hydrogen absorption capacity that need to be improved.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a vanadium-based solid solution hydrogen storage alloy, comprising V: 7.5-8.5, Ti: 0.4-0.6, Cr: 0.7-0.9, Fe: 1.0-1.4, Al: 0.25-0.35, and Mn: 0.45-0.55 in a proportion thereof.

[0007] The present invention also discloses a method for preparing a vanadium-based solid solution hydrogen storage alloy, which is used to prepare the vanadium-based solid solution hydrogen storage alloy and further includes the following preparation steps:

[0008] S101: V, Ti, Cr, Fe, Al, and Mn are prepared and placed in a vacuum crucible, and the crucible is placed in a melting furnace;

[0009] Among them, Mn is placed at the bottom of the crucible;

[0010] Pump into the crucible to 6×10 -3 Vacuum below Pa, fill with nitrogen to 0.07MPa;

[0011] Turn on the magnetic stirring function of the crucible and melt for 5 to 15 minutes to form a material block A;

[0012] Turn the cooled material block A over and over, and repeat the above stirring and melting steps 3 to 5 times to obtain a material block A with uniform composition.

[0013] S102: preparing a vanadium-based solid solution hydrogen storage alloy block, cutting a portion of a sample from the obtained material block A and placing it in a quartz container with a slit at the bottom;

[0014] The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

[0015] Preferably, the Mn powder is placed at the bottom of the crucible, and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure.

[0016] Preferably, the first melting temperature is increased to 1850±50°C, and the subsequent melting stages are cooled by steps, with a single cooling of 150°C, and the magnetic stirring frequency is gradually increased from 20 Hz to 50 Hz.

[0017] Preferably, the smelting process comprises at least three temperature step smeltings.

[0018] Preferably, when the single-roll melt spinning device spins the material block A, a pulsed high-pressure nitrogen injection is introduced, and the high-pressure nitrogen injection maintains a pulse interval of 0.5s and a peak pressure of 8MPa, so that a honeycomb microporous structure is formed on the surface of the material block A.

[0019] Preferably, the metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared in a ratio of V: 7.5, Ti: 0.4, Cr: 0.7, Fe: 1.0, Al: 0.25, and Mn: 0.45.

[0020] Preferably, the metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared in the ratio of V: 7.8, Ti: 0.45, Cr: 0.75, Fe: 1.1, Al: 0.28, and Mn: 0.48.

[0021] Preferably, the metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared in a ratio of V: 7.9, Ti: 0.49, Cr: 0.78, Fe: 1.2, Al: 0.27, and Mn: 0.51.

[0022] Preferably, the metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared in a ratio of V: 8.5, Ti: 0.6, Cr: 0.9, Fe: 1.4, Al: 0.35, and Mn: 0.55.

[0023] Technical effects and advantages of the present invention:

[0024] 1. Mn powder is pre-laid on the bottom of the crucible, and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure;

[0025] 2. The initial melting temperature was raised to 1850±50℃, and the subsequent melting stages were cooled by steps, combined with a gradient increase in the magnetic stirring frequency; the grain size was refined, and the proportion of crystal faces was increased;

[0026] 3. Through high-pressure nitrogen coordinated spin quenching, pulsed high-pressure nitrogen injection is introduced during the single-roll spin quenching stage to form a honeycomb microporous structure on the surface of material block A; the room temperature hydrogen absorption capacity is increased to more than 3.6wt%. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a step diagram of the method for preparing the vanadium-based solid solution hydrogen storage alloy of the present invention. DETAILED DESCRIPTION

[0028] The present invention provides Figure 1 A vanadium-based solid solution hydrogen storage alloy and a preparation method thereof are shown.

[0029] Example 1

[0030] Step 1, smelting. Prepare the metal vanadium, titanium, chromium, iron, aluminum and manganese in the proportion of V: 7.5, Ti: 0.4, Cr: 0.7, Fe: 1.0, Al: 0.25, Mn: 0.45, and place them in a vacuum crucible, with Mn placed at the bottom of the crucible. The vacuum degree in the crucible is 6×10 -3 Pa, and fill with nitrogen to 0.07MPa as a protective atmosphere.

[0031] The crucible is installed in a melting furnace, and the magnetic stirring function of the crucible is turned on for melting for 5 to 15 minutes to form a material block A.

[0032] The cooled material block A is turned over on its upper and lower surfaces, and the above stirring and melting steps are repeated 3 to 5 times to obtain a material block A with uniform composition.

[0033] In the present invention, Mn powder is pre-laid on the bottom of the crucible (melting point difference reaches 300°C), and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure (SEM verification shows a core-shell spacing of 5-8nm); the hydrogen absorption platform pressure of the alloy is reduced by 40% (from 0.35MPa to 0.21MPa), and the low-temperature (-20°C) hydrogen absorption rate is increased by more than 3 times.

[0034] During melting, the initial melting temperature was raised to 1850±50°C (200°C higher than the traditional process), and step cooling (ΔT=150°C / time) was adopted in the subsequent melting stage, with the magnetic stirring frequency gradually increased from 20Hz to 50Hz; the grain size was refined from 50-80nm in the traditional process to 18-22nm, and the proportion of (110) crystal planes was increased to 76%.

[0035] The smelting process includes at least three temperature step smeltings, with the first smelting temperature at 1800-1900°C and the last smelting temperature controlled at 1550-1650°C. The temperature difference between adjacent smelting stages is 100-200°C, and the magnetic stirring frequency increases gradually from 15Hz to 60Hz with the number of smeltings.

[0036] In the present invention, high-pressure nitrogen is used in conjunction with spin quenching, and pulsed high-pressure nitrogen injection (0.5s pulse interval, peak pressure 8MPa) is introduced during the single-roll spin quenching stage to form a honeycomb microporous structure (pore diameter 200-500nm, specific surface area increased by 5.8 times) on the surface of material block A; the room temperature hydrogen absorption capacity is increased from 3.2wt% to 3.6-3.8wt%, and the capacity retention rate after 100 cycles is greater than 92% (the traditional process is 78%).

[0037] During the single-roller quenching stage, a pulsed high-pressure nitrogen injection process is used with a pulse frequency of 0.2-1 Hz and a gas pressure of 5-10 MPa to form honeycomb multi-level channels with a pore size of 100-800 nm on the surface of the material block A.

[0038] Step 2: Prepare a vanadium-based solid solution hydrogen storage alloy block. Cut a portion of the sample from the obtained material block A and place it in a quartz container with a slit at the bottom.

[0039] The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

[0040] In the present invention, vanadium is a basic element with the highest mass proportion, constituting the solid solution skeleton of the alloy; titanium and vanadium form a solid solution core structure, regulating the thermodynamic properties of hydrogen absorption and desorption; chromium improves the alloy's oxidation resistance and enhances structural stability; iron replaces vanadium to reduce costs (such as by using FeV80 master alloy for preparation) while maintaining hydrogen storage capacity; aluminum can improve hydrogen diffusion kinetics and reduce the activation energy of hydrogen absorption and desorption.

[0041] The hydrogen absorption capacity at room temperature can reach more than 3.6wt%.

[0042] Table 1 Performance comparison table in Example 1

[0043]

[0044]

[0045] Example 2

[0046] Step 1: Smelting: Prepare the metals vanadium, titanium, chromium, iron, aluminum and manganese in the proportion of V: 7.8, Ti: 0.45, Cr: 0.75, Fe: 1.1, Al: 0.28, and Mn: 0.48. Place them in a vacuum crucible, with Mn placed at the bottom of the crucible. The vacuum degree in the crucible is drawn to 6×10 -3 Pa, and fill with nitrogen to 0.07MPa as a protective atmosphere.

[0047] The crucible is installed in a melting furnace, and the magnetic stirring function of the crucible is turned on for melting for 5 to 15 minutes to form a material block A.

[0048] The cooled material block A is turned over on its upper and lower surfaces, and the above stirring and melting steps are repeated 3 to 5 times to obtain a material block A with uniform composition.

[0049] In the present invention, Mn powder is pre-laid on the bottom of the crucible (melting point difference reaches 300°C), and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure (SEM verification shows a core-shell spacing of 5-8nm); the hydrogen absorption platform pressure of the alloy is reduced by 40% (from 0.35MPa to 0.21MPa), and the low-temperature (-20°C) hydrogen absorption rate is increased by more than 3 times.

[0050] During melting, the initial melting temperature was raised to 1850±50°C (200°C higher than the traditional process), and step cooling (ΔT=150°C / time) was adopted in the subsequent melting stage, with the magnetic stirring frequency gradually increased from 20Hz to 50Hz; the grain size was refined from 50-80nm in the traditional process to 18-22nm, and the proportion of (110) crystal planes was increased to 76%.

[0051] The smelting process includes at least three temperature step smeltings, with the first smelting temperature at 1800-1900°C and the last smelting temperature controlled at 1550-1650°C. The temperature difference between adjacent smelting stages is 100-200°C, and the magnetic stirring frequency increases gradually from 15Hz to 60Hz with the number of smeltings.

[0052] In the present invention, high-pressure nitrogen is used in conjunction with spin quenching, and pulsed high-pressure nitrogen injection (0.5s pulse interval, peak pressure 8MPa) is introduced during the single-roll spin quenching stage to form a honeycomb microporous structure (pore diameter 200-500nm, specific surface area increased by 5.8 times) on the surface of material block A; the room temperature hydrogen absorption capacity is increased from 3.2wt% to 3.6-3.8wt%, and the capacity retention rate after 100 cycles is greater than 92% (the traditional process is 78%).

[0053] During the single-roller quenching stage, a pulsed high-pressure nitrogen injection process is used with a pulse frequency of 0.2-1 Hz and a gas pressure of 5-10 MPa to form honeycomb multi-level channels with a pore size of 100-800 nm on the surface of the material block A.

[0054] Step 2: Prepare a vanadium-based solid solution hydrogen storage alloy block. Cut a portion of the sample from the obtained material block A and place it in a quartz container with a slit at the bottom.

[0055] The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

[0056] In the present invention, vanadium is a basic element with the highest mass proportion, constituting the solid solution skeleton of the alloy; titanium and vanadium form a solid solution core structure, regulating the thermodynamic properties of hydrogen absorption and desorption; chromium improves the alloy's oxidation resistance and enhances structural stability; iron replaces vanadium to reduce costs (such as by using FeV80 master alloy for preparation) while maintaining hydrogen storage capacity; aluminum can improve hydrogen diffusion kinetics and reduce the activation energy of hydrogen absorption and desorption.

[0057] The hydrogen absorption capacity at room temperature can reach more than 3.6wt%.

[0058] Example 3

[0059] Step 1, smelting. Prepare the metal vanadium, titanium, chromium, iron, aluminum and manganese according to the molecular formula V: 7.9, Ti: 0.49, Cr: 0.78, Fe: 1.2, Al: 0.27, Mn: 0.51, and place them in a vacuum crucible, with Mn placed at the bottom of the crucible. The vacuum degree in the crucible is 6×10 -3 Pa, and fill with nitrogen to 0.07MPa as a protective atmosphere.

[0060] The crucible is installed in a melting furnace, and the magnetic stirring function of the crucible is turned on for melting for 5 to 15 minutes to form a material block A.

[0061] The cooled material block A is turned over on its upper and lower surfaces, and the above stirring and melting steps are repeated 3 to 5 times to obtain a material block A with uniform composition.

[0062] In the present invention, Mn powder is pre-laid on the bottom of the crucible (melting point difference reaches 300°C), and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure (SEM verification shows a core-shell spacing of 5-8nm); the hydrogen absorption platform pressure of the alloy is reduced by 40% (from 0.35MPa to 0.21MPa), and the low-temperature (-20°C) hydrogen absorption rate is increased by more than 3 times.

[0063] During melting, the initial melting temperature was raised to 1850±50°C (200°C higher than the traditional process), and step cooling (ΔT=150°C / time) was adopted in the subsequent melting stage, with the magnetic stirring frequency gradually increased from 20Hz to 50Hz; the grain size was refined from 50-80nm in the traditional process to 18-22nm, and the proportion of (110) crystal planes was increased to 76%.

[0064] The smelting process includes at least three temperature step smeltings, with the first smelting temperature at 1800-1900°C and the last smelting temperature controlled at 1550-1650°C. The temperature difference between adjacent smelting stages is 100-200°C, and the magnetic stirring frequency increases gradually from 15Hz to 60Hz with the number of smeltings.

[0065] In the present invention, high-pressure nitrogen is used in conjunction with spin quenching, and pulsed high-pressure nitrogen injection (0.5s pulse interval, peak pressure 8MPa) is introduced during the single-roll spin quenching stage to form a honeycomb microporous structure (pore diameter 200-500nm, specific surface area increased by 5.8 times) on the surface of material block A; the room temperature hydrogen absorption capacity is increased from 3.2wt% to 3.6-3.8wt%, and the capacity retention rate after 100 cycles is greater than 92% (the traditional process is 78%).

[0066] During the single-roller quenching stage, a pulsed high-pressure nitrogen injection process is used with a pulse frequency of 0.2-1 Hz and a gas pressure of 5-10 MPa to form honeycomb multi-level channels with a pore size of 100-800 nm on the surface of the material block A.

[0067] Step 2: Prepare a vanadium-based solid solution hydrogen storage alloy block. Cut a portion of the sample from the obtained material block A and place it in a quartz container with a slit at the bottom.

[0068] The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

[0069] In the present invention, vanadium is a basic element with the highest mass proportion, constituting the solid solution skeleton of the alloy; titanium and vanadium form a solid solution core structure, regulating the thermodynamic properties of hydrogen absorption and desorption; chromium improves the alloy's oxidation resistance and enhances structural stability; iron replaces vanadium to reduce costs (such as by using FeV80 master alloy for preparation) while maintaining hydrogen storage capacity; aluminum can improve hydrogen diffusion kinetics and reduce the activation energy of hydrogen absorption and desorption.

[0070] The hydrogen absorption capacity at room temperature can reach more than 3.6wt%.

[0071] Example 4

[0072] Step 1, smelting. Prepare the metal vanadium, titanium, chromium, iron, aluminum and manganese according to the molecular formula V: 8.5, Ti: 0.6, Cr: 0.9, Fe: 1.4, Al: 0.35, Mn: 0.55, and place them in a vacuum crucible, with Mn placed at the bottom of the crucible. The vacuum degree in the crucible is 6×10 -3 Pa, and fill with nitrogen to 0.07MPa as a protective atmosphere.

[0073] The crucible is installed in a melting furnace, and the magnetic stirring function of the crucible is turned on for melting for 5 to 15 minutes to form a material block A.

[0074] The cooled material block A is turned over on its upper and lower surfaces, and the above stirring and melting steps are repeated 3 to 5 times to obtain a material block A with uniform composition.

[0075] In the present invention, Mn powder is pre-laid on the bottom of the crucible (melting point difference reaches 300°C), and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, inducing the formation of a nanoscale V-Ti core-shell structure (SEM verification shows a core-shell spacing of 5-8nm); the hydrogen absorption platform pressure of the alloy is reduced by 40% (from 0.35MPa to 0.21MPa), and the low-temperature (-20°C) hydrogen absorption rate is increased by more than 3 times.

[0076] During melting, the initial melting temperature was raised to 1850±50°C (200°C higher than the traditional process), and step cooling (ΔT=150°C / time) was adopted in the subsequent melting stage, with the magnetic stirring frequency gradually increased from 20Hz to 50Hz; the grain size was refined from 50-80nm in the traditional process to 18-22nm, and the proportion of (110) crystal planes was increased to 76%.

[0077] The smelting process includes at least three temperature step smeltings, with the first smelting temperature at 1800-1900°C and the last smelting temperature controlled at 1550-1650°C. The temperature difference between adjacent smelting stages is 100-200°C, and the magnetic stirring frequency increases gradually from 15Hz to 60Hz with the number of smeltings.

[0078] In the present invention, high-pressure nitrogen is used in conjunction with spin quenching, and pulsed high-pressure nitrogen injection (0.5s pulse interval, peak pressure 8MPa) is introduced during the single-roll spin quenching stage to form a honeycomb microporous structure (pore diameter 200-500nm, specific surface area increased by 5.8 times) on the surface of material block A; the room temperature hydrogen absorption capacity is increased from 3.2wt% to 3.6-3.8wt%, and the capacity retention rate after 100 cycles is greater than 92% (the traditional process is 78%).

[0079] During the single-roller quenching stage, a pulsed high-pressure nitrogen injection process is used with a pulse frequency of 0.2-1 Hz and a gas pressure of 5-10 MPa to form honeycomb multi-level channels with a pore size of 100-800 nm on the surface of the material block A.

[0080] Step 2: Prepare a vanadium-based solid solution hydrogen storage alloy block. Cut a portion of the sample from the obtained material block A and place it in a quartz container with a slit at the bottom.

[0081] The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

[0082] In the present invention, vanadium is a basic element with the highest mass proportion, constituting the solid solution skeleton of the alloy; titanium and vanadium form a solid solution core structure, regulating the thermodynamic properties of hydrogen absorption and desorption; chromium improves the alloy's oxidation resistance and enhances structural stability; iron replaces vanadium to reduce costs (such as by using FeV80 master alloy for preparation) while maintaining hydrogen storage capacity; aluminum can improve hydrogen diffusion kinetics and reduce the activation energy of hydrogen absorption and desorption.

[0083] The hydrogen absorption capacity at room temperature can reach more than 3.6wt%.

Claims

1. A vanadium-based solid solution hydrogen storage alloy, characterized in that: The method comprises preparing the composite material according to the ratio of molecular formula V: 7.5-8.5, Ti: 0.4-0.6, Cr: 0.7-0.9, Fe: 1.0-1.4, Al: 0.25-0.35, and Mn: 0.45-0.

55.

2. A method for preparing a vanadium-based solid solution hydrogen storage alloy, characterized in that: The method for preparing the vanadium-based solid solution hydrogen storage alloy according to claim 1 further comprises the following preparation steps: S101: V, Ti, Cr, Fe, Al, and Mn are prepared and placed in a vacuum crucible, and the crucible is placed in a melting furnace; Among them, Mn is placed at the bottom of the crucible; Pump into the crucible to 6×10 -3 Vacuum below Pa, fill with nitrogen to 0.07MPa; Turn on the magnetic stirring function of the crucible and melt for 5 to 15 minutes to form a material block A; Turn the cooled material block A over and over, and repeat the above stirring and melting steps 3 to 5 times to obtain a material block A with uniform composition. S102: preparing a vanadium-based solid solution hydrogen storage alloy block, cutting a portion of a sample from the obtained material block A and placing it in a quartz container with a slit at the bottom; The quartz container is placed in the induction coil of a single-roll melt spinning device for heating to melt the sample; high-pressure nitrogen is introduced to spray the molten alloy from the slit of the quartz container onto the rotating copper roller to form a vanadium-based solid solution hydrogen storage alloy block.

3. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, wherein: The Mn powder is placed at the bottom of the crucible, and a gradient diffusion path of Mn→V→Fe→Ti is formed during magnetic stirring, thereby inducing the generation of a nano-scale V-Ti core-shell structure.

4. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, wherein: The initial melting temperature was raised to 1850±50°C, and the subsequent melting stages were conducted with step-by-step cooling, with a single cooling of 150°C, and the magnetic stirring frequency was gradually increased from 20Hz to 50Hz.

5. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 4, characterized in that: The smelting process includes at least 3 temperature step smeltings.

6. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, characterized in that: When the single-roll melt spinning device spins the material block A, a pulsed high-pressure nitrogen injection is introduced. The high-pressure nitrogen injection maintains a pulse interval of 0.5s and a peak pressure of 8MPa, so that a honeycomb microporous structure is formed on the surface of the material block A.

7. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, characterized in that: Metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared according to the molecular formula V: 7.5, Ti: 0.4, Cr: 0.7, Fe: 1.0, Al: 0.25, Mn: 0.

45.

8. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, characterized in that: Metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared according to the molecular formula V: 7.8, Ti: 0.45, Cr: 0.75, Fe: 1.1, Al: 0.28, Mn: 0.

48.

9. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, wherein: Metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared according to the molecular formula V: 7.9, Ti: 0.49, Cr: 0.78, Fe: 1.2, Al: 0.27, Mn: 0.

51.

10. The method for preparing a vanadium-based solid solution hydrogen storage alloy according to claim 2, characterized in that: Metal vanadium, titanium, chromium, iron, aluminum and manganese are prepared according to the molecular formula V: 8.5, Ti: 0.6, Cr: 0.9, Fe: 1.4, Al: 0.35, Mn: 0.55.

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