Lanthanum yttrium nickel hydrogen storage alloy, its production method and use of vanadium

Abstract

The application discloses a lanthanum-yttrium-nickel hydrogen storage alloy, a production method thereof and a use of vanadium. The chemical composition of the lanthanum-yttrium-nickel hydrogen storage alloy is shown as formula (1): La m Ce n Y p Ni 21‑a‑b Mn a V b (1); wherein m is greater than or equal to 0.2 and less than or equal to 2.5, n is greater than or equal to 0.5 and less than or equal to 2, m+n+p=6, a is greater than or equal to 0.3 and less than or equal to 0.9, and b is greater than or equal to 0.05 and less than or equal to 0.45; m, n, p, 21-a-b, a and b respectively represent the mole fractions of La, Ce, Y, Ni, Mn and V. The lanthanum-yttrium-nickel hydrogen storage alloy has a high reversible hydrogen storage capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to a lanthanum-yttrium-nickel hydrogen storage alloy and a production method thereof and the use of vanadium. BACKGROUND

[0002] Hydrogen is an important clean energy, but hydrogen is easy to leak, and mixed with air, it has the risk of explosion, which brings difficulties to the storage and transportation of hydrogen. Among the currently common various types of organic liquids, complexes, porous solid adsorption and metal hydride hydrogen storage materials, rare earth metal hydride hydrogen storage materials have great application potential due to their easy activation, mild hydrogen storage conditions, fast hydrogen absorption and desorption rate, and small hysteresis.

[0003] CN116479773A discloses a rare earth hydrogen storage alloy, which is a yttrium-magnesium-nickel-based hydrogen storage material with a general composition of Y a A b Mg c Ni x B y . A is one or more elements selected from La, Ce, Pr, Nd, Sm and Gd, and B is one or more elements selected from Al, V, Mn, Fe, Co, Cu and Zn, wherein 0.3≤a<1, 0<b≤0.4, 0.05≤c≤0.4, a+b+c=1, 1.5≤x≤2.5, 0≤y≤0.5, 1.5≤x+y≤2.5. The rare earth hydrogen storage alloy contains Mg element, which is prone to explosion and other safety hazards during preparation.

[0004] CN115786770A discloses a rare earth-calcium-nickel hydrogen storage alloy with a composition as shown below: La a RE b Y c Ca d Ni x Mn y Al z Q t ; wherein a, b, c, d, x, y, z and t represent the mole fraction of La, RE, Y, Ca, Ni, Mn, Al and Q, respectively; wherein 0.1≤a≤0.7, 0≤b≤0.45, 0.05≤c≤0.5, 0.1≤d≤0.6, a+b+c+d=1; 4.3≤x≤4.95, 0≤y≤0.4, 0≤z≤0.4, 0.05≤y+z≤0.65, 0≤t≤0.2, 4.8≤x+y+z+t≤5.2; wherein RE is selected from one or more of Ce, Sm, Nd and Pr; wherein Q is selected from one or more of Cu, Sn, V, Ti, Zr, Cr, Zn, Mo and Si. The hydrogen storage alloy is an AB5 type hydrogen storage alloy.

[0005] CN115992319A discloses a rare earth hydrogen storage alloy, the chemical composition of which is shown in formula (1): RE x Ca y Ni d-a- b Mn a M b (1); wherein, 0.5≤x≤0.9, 0.1≤y≤0.5, and x+y=1; 0.05≤a≤0.35, 0≤b≤0.3, 4.5≤d≤5.5, 4.68≤d-a-b≤4.95; wherein, RE is selected from one or more of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, and must contain La and Ce; wherein, M is selected from one or more of Cu, Sn, V, Ti, Zr, Cr, Zn, Mo and Si; wherein, x, y, a, b and d-a-b represent the mole fraction of each element, respectively. The hydrogen storage alloy is an AB5 type hydrogen storage alloy. SUMMARY

[0006] Therefore, one object of the present application is to provide a lanthanum-yttrium-nickel hydrogen storage alloy with higher reversible hydrogen storage capacity. Further, the lanthanum-yttrium-nickel hydrogen storage alloy has a higher proportion of hydrogen storage capacity above 0.1 MPa. Still further, the lanthanum-yttrium-nickel hydrogen storage alloy has a higher hydrogen desorption plateau pressure. Another object of the present application is to provide a production method of the above-mentioned lanthanum-yttrium-nickel hydrogen storage alloy. Still another object of the present application is to provide a use of vanadium. The above technical objects are achieved by the following technical solutions.

[0007] In one aspect, the present application provides a lanthanum-yttrium-nickel hydrogen storage alloy, the chemical composition of which is shown in formula (1):

[0008] La m Ce n Y p Ni 21-a-b Mn a V b (1);

[0009] wherein, m is greater than or equal to 0.2 and less than or equal to 2.5, n is greater than or equal to 0.5 and less than or equal to 2, m+n+p=6, a is greater than or equal to 0.3 and less than or equal to 0.9, b is greater than or equal to 0.05 and less than or equal to 0.45; m, n, p, 21-a-b, a and b represent the mole fraction of La, Ce, Y, Ni, Mn and V, respectively.

[0010] According to the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, preferably, 21-a-b is greater than or equal to 19.8 and less than or equal to 20.5, and p is greater than or equal to 2 and less than or equal to 5.

[0011] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, the lanthanum-yttrium nickel series hydrogen storage alloy has A2B7 phase as the main phase, and the content of A2B7 phase in the lanthanum-yttrium nickel series hydrogen storage alloy is greater than or equal to 60wt%.

[0012] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, the A2B7 phase is Ce2Ni7 phase.

[0013] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, the lanthanum-yttrium nickel series hydrogen storage alloy is composed of A2B7 phase and A5B 19 phase.

[0014] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, m is greater than or equal to 0.5 and less than or equal to 2, n is greater than or equal to 1 and less than or equal to 1.5, and p is greater than or equal to 2.5 and less than or equal to 4.5.

[0015] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, a is greater than or equal to 0.5 and less than or equal to 0.8, and b is greater than or equal to 0.1 and less than or equal to 0.4.

[0016] According to the lanthanum-yttrium nickel series hydrogen storage alloy of the present application, preferably, the lanthanum-yttrium nickel series hydrogen storage alloy has the composition shown in one of the following:

[0017] LaCeY4Ni 20 Mn 0.6 V 0.4 ;

[0018] LaCeY4Ni 20.1 Mn 0.6 V 0.3 ;

[0019] LaCeY4Ni 20.2 Mn 0.6 V 0.2 ;

[0020] LaCeY4Ni 20.3 Mn 0.6 V 0.1 ;

[0021] La 0.5 CeY 4.5 Ni 20 Mn 0.6 V 0.4 ;

[0022] La 0.5 CeY 4.5 Ni 20.1 Mn 0.6 V 0.3 ;

[0023] La0.5 CeY 4.5 Ni 20.2 Mn 0.6 V 0.2 ;

[0024] La 0.5 CeY 4.5 Ni 20.3 Mn 0.6 V 0.1 ;

[0025] La2Ce 1.5 Y 2.5 Ni 20.1 Mn 0.6 V 0.3 ;

[0026] La2Ce 1.5 Y 2.5 Ni 20.2 Mn 0.6 V 0.2 ;

[0027] La2Ce 1.5 Y 2.5 Ni 20.3 Mn 0.6 V 0.1 。

[0028] In another aspect, the present application provides a production method of the above-mentioned lanthanum-yttrium-nickel-based hydrogen storage alloy, comprising the following steps:

[0029] melting raw materials provided according to the composition of the lanthanum-yttrium-nickel-based hydrogen storage alloy to form an alloy liquid; rapidly quenching the alloy liquid to form an alloy sheet; then heating the alloy sheet from an initial temperature to 650-950℃ at a heating rate of 3-18℃ / min, and then heating to 950-1250℃ at a heating rate of 1-15℃ / min, and holding for 10-20h to complete annealing.

[0030] In still another aspect, the present application provides a use of vanadium in improving the reversible hydrogen storage capacity and / or the proportion of hydrogen storage capacity at 0.1MPa or above of a lanthanum-yttrium-nickel-based hydrogen storage alloy, characterized in that the amount of V in the lanthanum-yttrium-nickel-based hydrogen storage alloy is 0.05-0.45 mole fraction.

[0031] The lanthanum-yttrium-nickel-based hydrogen storage alloy comprises La 0.2-2.5 mole fraction, Ce 0.5-2 mole fraction, Y 2-5 mole fraction, Ni 19.8-20.5 mole fraction, and Mn 0.3-0.9 mole fraction.

[0032] The lanthanum-yttrium-nickel hydrogen storage alloy of the present application is substituted with cerium in place of lanthanum and / or yttrium in an appropriate amount, and the content of lanthanum and yttrium is controlled in an appropriate amount; and the lanthanum-yttrium-nickel hydrogen storage alloy is substituted with manganese and vanadium in place of nickel in an appropriate amount, so that the lanthanum-yttrium-nickel hydrogen storage alloy has a higher reversible hydrogen storage capacity. According to the preferred technical solution of the present application, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application has a higher reversible hydrogen storage capacity and a hydrogen storage capacity at a pressure of 0.1 MPa or above accounts for 10% or more; preferably, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application can take into account the reversible hydrogen storage capacity, the hydrogen storage capacity at a pressure of 0.1 MPa or above accounts for 10% or more, and the hydrogen release plateau pressure. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with specific examples, but the scope of protection of the present application is not limited thereto.

[0034] <lanthanum-yttrium-nickel hydrogen storage alloy>

[0035] The lanthanum-yttrium-nickel hydrogen storage alloy of the present application has a chemical composition as shown in formula (1):

[0036] La m Ce n Y p Ni 21-a-b Mn a V b (1).

[0037] The lanthanum-yttrium-nickel hydrogen storage alloy of the present application includes La, Ce, Y, Ni, Mn and V. Preferably, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application does not contain alkali metals and alkaline earth metals. Examples of alkali metals include but are not limited to lithium, sodium, potassium. Examples of alkaline earth metals include but are not limited to beryllium, magnesium, calcium, strontium, barium. More preferably, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application is composed of only the elements shown in formula (1), and of course can contain some unavoidable impurities.

[0038] The lanthanum-yttrium-nickel hydrogen storage alloy of the present application has A2B7 phase as the main phase. The A2B7 phase is Ce2Ni7 phase. Specifically, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application includes A2B7 phase and A5B 19 phase. The A5B 19 phase is Ce5Co 19 phase.

[0039] The content of A2B7 phase in the lanthanum-yttrium-nickel hydrogen storage alloy of the present application is greater than or equal to 60wt%; preferably, the content of A2B7 phase is 70-90wt%. In some embodiments, the content of A2B7 phase is 75-85wt%.

[0040] La represents a rare earth element lanthanum. m represents the mole fraction of La. m is greater than or equal to 0.2 and less than or equal to 2.5; preferably, m is greater than or equal to 0.5 and less than or equal to 2. In some embodiments, m is greater than or equal to 0.7 and less than or equal to 1.8. In other embodiments, m is greater than or equal to 1 and less than or equal to 1.2.

[0041] Ce represents a rare earth element cerium. n represents the mole fraction of Ce. n is greater than or equal to 0.5 and less than or equal to 2. Preferably, n is greater than or equal to 1 and less than or equal to 1.5. In some embodiments, n is greater than or equal to 1 and less than or equal to 1.2.

[0042] Y represents a rare earth element yttrium. p represents the mole fraction of Y. m + n + p = 6, and p can be determined according to m and n. p is greater than or equal to 2 and less than or equal to 5; preferably, p is greater than or equal to 2.5 and less than or equal to 4.5. In some embodiments, p is greater than or equal to 2.5 and less than or equal to 2.8. In other embodiments, p is greater than or equal to 4 and less than or equal to 4.2.

[0043] Mn represents a metal element manganese. a represents the mole fraction of manganese. a is greater than or equal to 0.3 and less than or equal to 0.9; preferably, a is greater than or equal to 0.5 and less than or equal to 0.8; more preferably, a is greater than or equal to 0.6 and less than or equal to 0.7.

[0044] V represents a metal element vanadium. b represents the mole fraction of vanadium. b is greater than or equal to 0.05 and less than or equal to 0.45; preferably, b is greater than or equal to 0.1 and less than or equal to 0.4. In some embodiments, b is greater than or equal to 0.2 and less than or equal to 0.3.

[0045] Ni represents a metal element nickel. 21 - a - b represents the mole fraction of nickel. The content of nickel can be determined according to a and b. 21 - a - b is greater than or equal to 19.8 and less than or equal to 20.5; preferably, 21 - a - b is greater than or equal to 20 and less than or equal to 20.3. In some embodiments, 21 - a - b is greater than or equal to 20.1 and less than or equal to 20.2.

[0046] In some embodiments, the lanthanum-yttrium-nickel hydrogen storage alloy of the present application has a composition shown in one of the following:

[0047] LaCeY4Ni 20 Mn 0.6 V 0.4 ;

[0048] LaCeY4Ni 20.1 Mn 0.6 V 0.3 ;

[0049] LaCeY4Ni 20.2Mn 0.6 V 0.2 ;

[0050] LaCeY4Ni 20.3 Mn 0.6 V 0.1 ;

[0051] La 0.5 CeY 4.5 Ni 20 Mn 0.6 V 0.4 ;

[0052] La 0.5 CeY 4.5 Ni 20.1 Mn 0.6 V 0.3 ;

[0053] La 0.5 CeY 4.5 Ni 20.2 Mn 0.6 V 0.2 ;

[0054] La 0.5 CeY 4.5 Ni 20.3 Mn 0.6 V 0.1 ;

[0055] La2Ce 1.5 Y 2.5 Ni 20.1 Mn 0.6 V 0.3 ;

[0056] La2Ce 1.5 Y 2.5 Ni 20.2 Mn 0.6 V 0.2 ;

[0057] La2Ce 1.5 Y 2.5 Ni 20.3 Mn 0.6 V 0.1 .

[0058] The lanthanum-yttrium-nickel hydrogen storage alloy of the present application has a high reversible hydrogen storage capacity. The reversible hydrogen storage capacity is greater than or equal to 1.6wt%; preferably, greater than or equal to 1.65wt%; more preferably, greater than or equal to 1.7wt%.

[0059] The hydrogen storage alloy has a high hydrogen storage amount ratio at 0.1 MPa or above. The hydrogen storage amount ratio at 0.1 MPa or above is greater than or equal to 70 wt%; preferably, greater than or equal to 80 wt%; more preferably, greater than or equal to 90 wt%.

[0060] The lanthanum-yttrium-nickel hydrogen storage alloy has a high hydrogen release plateau pressure. The hydrogen release plateau pressure is greater than or equal to 0.09 MPa; preferably, greater than or equal to 0.2 MPa; more preferably, greater than or equal to 0.4 MPa; most preferably, greater than or equal to 0.5 MPa.

[0061] <Production method of lanthanum-yttrium-nickel hydrogen storage alloy>

[0062] The production method of the lanthanum-yttrium-nickel hydrogen storage alloy comprises the following steps: melting raw materials provided according to the composition of the lanthanum-yttrium-nickel hydrogen storage alloy to form an alloy liquid; rapidly quenching the alloy liquid to form an alloy sheet; then heating the alloy sheet from an initial temperature to T1 at a heating rate of C1, and then heating to T2 at a heating rate of C2, and annealing for t to complete annealing. Preferably, after the annealing process, the alloy sheet is cooled to room temperature in the furnace to obtain an annealed alloy sheet.

[0063] The melting can be carried out in an inert atmosphere. The melting can be carried out in a medium-frequency induction melting furnace.

[0064] The annealing can be carried out in an inert atmosphere. Preferably, the gas providing the inert atmosphere is selected from one or more of nitrogen, argon, and helium. The initial temperature can be room temperature. For example, 20-35°C. C1 can be 3-18°C / min; preferably, 8-12°C / min. T1 can be 650-950°C; preferably, 750-850°C. C2 can be 1-15°C / min; preferably, 3-7°C / min. T2 can be 950-1250°C; preferably, 1050-1100°C. T can be 10-20 h; preferably, 13-17 h.

[0065] The production method of the present application can further comprise the following steps: crushing the annealed alloy sheet to obtain a lanthanum-yttrium-nickel hydrogen storage alloy.

[0066] The crushing can be carried out in an inert atmosphere. Preferably, the gas providing the inert atmosphere is selected from one or more of nitrogen, argon, and helium. The crushing can be carried out in a combination of mechanical crushing and grinding. The mechanical crushing can be carried out first, followed by grinding.

[0067] <Use of vanadium>

[0068] The present application finds that adding an appropriate amount of vanadium to a lanthanum-yttrium-nickel hydrogen storage alloy can improve the reversible hydrogen storage capacity and the proportion of hydrogen storage capacity above 0.1 MPa of the lanthanum-yttrium-nickel hydrogen storage alloy. Therefore, the present application provides a use of vanadium in improving the reversible hydrogen storage capacity and / or the proportion of hydrogen storage capacity above 0.1 MPa of a lanthanum-yttrium-nickel hydrogen storage alloy. In some embodiments, the present application provides a use of vanadium in improving the reversible hydrogen storage capacity of a lanthanum-yttrium-nickel hydrogen storage alloy. In other embodiments, the present application provides a use of vanadium in improving the proportion of hydrogen storage capacity above 0.1 MPa of a lanthanum-yttrium-nickel hydrogen storage alloy.

[0069] The lanthanum-yttrium-nickel hydrogen storage alloy contains La, Ce, Y, Ni and Mn. Preferably, the lanthanum-yttrium-nickel hydrogen storage alloy does not contain alkali metals and alkaline earth metals. Examples of alkali metals include but are not limited to lithium, sodium, potassium. Examples of alkaline earth metals include but are not limited to beryllium, magnesium, calcium, strontium, barium.

[0070] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar content of La can be represented by m. m is greater than or equal to 0.2 and less than or equal to 2.5; preferably, m is greater than or equal to 0.5 and less than or equal to 2. In some embodiments, m is greater than or equal to 0.7 and less than or equal to 1.8. In other embodiments, m is greater than or equal to 1 and less than or equal to 1.2.

[0071] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar content of Ce can be represented by n. n is greater than or equal to 0.5 and less than or equal to 2. Preferably, n is greater than or equal to 1 and less than or equal to 1.5. In some embodiments, n is greater than or equal to 1 and less than or equal to 1.2.

[0072] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar content of Y can be represented by p. m+n+p=6, and the value of p can be determined according to m and n. p is greater than or equal to 2 and less than or equal to 5; preferably, p is greater than or equal to 2.5 and less than or equal to 4.5. In some embodiments, p is greater than or equal to 2.5 and less than or equal to 2.8. In other embodiments, p is greater than or equal to 4 and less than or equal to 4.2.

[0073] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar content of Mn can be represented by a. a is greater than or equal to 0.3 and less than or equal to 0.9; preferably, a is greater than or equal to 0.5 and less than or equal to 0.8; more preferably, a is greater than or equal to 0.6 and less than or equal to 0.7.

[0074] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar content of Ni can be represented by 21-a-b. 21-a-b is greater than or equal to 19.8 and less than or equal to 20.5; preferably, 21-a-b is greater than or equal to 20 and less than or equal to 20.3. In some embodiments, 21-a-b is greater than or equal to 20.1 and less than or equal to 20.2.

[0075] In the lanthanum-yttrium-nickel hydrogen storage alloy of the present application, the molar amount of V can be represented by b. b is greater than or equal to 0.05 and less than or equal to 0.45; preferably, b is greater than or equal to 0.1 and less than or equal to 0.4. In some embodiments, b is greater than or equal to 0.2 and less than or equal to 0.3.

[0076] The units of m, n, p, 21-a-b, a and b are all molar parts.

[0077] The test method is described below:

[0078] The X-ray diffraction spectrum is tested as follows: Test sample: lanthanum-yttrium-nickel hydrogen storage alloy with a particle size of less than 200 mesh. Test instrument: X'Pert PRO powder X-ray diffractometer (Cu target, Kα ray). Test conditions: power of 40 kV x 40 mA, step size of 0.01°, dwell time of 30 s per step, scanning range of 10-80°. The phase composition and phase content of the lanthanum-yttrium-nickel hydrogen storage alloy are determined according to the X-ray diffraction spectrum.

[0079] The test method of the P-C-T curve is as follows: Preparation of the test sample: 1.5-1.7 g of lanthanum-yttrium-nickel hydrogen storage alloy with a particle size of less than 100 mesh is vacuumed at 300°C for 30 min, and then cooled to room temperature to obtain the sample to be tested. The test temperature is 40°C. The test instrument is a Sievelts device. The hydrogen storage performance of the lanthanum-yttrium-nickel hydrogen storage alloy is obtained according to the P-C-T curve.

[0080] Examples 1 to 11

[0081] The raw materials provided according to the composition of the lanthanum-yttrium-nickel hydrogen storage alloy shown in Table 1 are melted in an inert atmosphere to obtain an alloy liquid. The melting is carried out in a medium-frequency induction melting furnace.

[0082] The alloy liquid is rapidly quenched to form an alloy sheet.

[0083] The alloy sheet is heated in an argon atmosphere from room temperature to 800°C at a heating rate of 10°C / min; then heated to 1050°C at a heating rate of 5°C / min, and held at 1050°C for 16 h to complete the annealing process, and then cooled to room temperature in the furnace to obtain an annealed alloy sheet.

[0084] The annealed alloy sheet is first mechanically broken and then ground in an argon atmosphere to obtain a lanthanum-yttrium-nickel hydrogen storage alloy.

[0085] The composition of the lanthanum-yttrium-nickel hydrogen storage alloy is shown in Table 1. The hydrogen storage performance of the lanthanum-yttrium-nickel hydrogen storage alloy is shown in Table 1.

[0086] The X-ray diffraction patterns of the hydrogen storage alloys obtained from Examples 1 to 11 show that the hydrogen storage alloys obtained from Examples 1 to 11 are composed of Ce2Ni7 phase and Ce5Co 19 The phase composition is mainly Ce2Ni7 phase. The content of Ce2Ni7 phase is shown in Table 1.

[0087] Table 1

[0088]

[0089] From Examples 1-4, 5-8, 9-11, it can be seen that V can improve the reversible hydrogen storage capacity of the hydrogen storage alloy, but the hydrogen release plateau pressure decreases with the increase of the content of V. The hydrogen storage capacity above 0.1 MPa accounts for a trend of first increasing and then decreasing.

[0090] The present application is not limited to the above-mentioned embodiments, any modification, improvement, replacement that can be thought of by those skilled in the art without departing from the essential content of the present application falls within the scope of the present application.

Claims

1. A lanthanum yttrium nickel-based hydrogen storage alloy, characterized by, The chemical composition is shown as formula (1): La m Ce n Y p Ni 21-a-b Mn a V b (1); Wherein, m is greater than or equal to 0.2 and less than or equal to 1.8, n is greater than or equal to 1 and less than or equal to 1.2, m+n+p=6, a is greater than or equal to 0.3 and less than or equal to 0.9, b is greater than or equal to 0.2 and less than or equal to 0.45; m, n, p, 21-a-b, a and b respectively represent the mole fraction of La, Ce, Y, Ni, Mn and V; The content of A2B7 phase in the lanthanum-yttrium-nickel hydrogen storage alloy is 75-90wt%; The reversible hydrogen storage capacity of the lanthanum-yttrium-nickel hydrogen storage alloy is greater than or equal to 1.65wt%.

2. The lanthanum yttrium nickel-based hydrogen storage alloy according to claim 1, characterized by, 21-a-b is greater than or equal to 19.8 and less than or equal to 20.5, and p is greater than or equal to 2.8 and less than or equal to 5.

3. The lanthanum yttrium nickel-based hydrogen storage alloy according to claim 1, characterized by, The A2B7 phase is Ce2Ni7 phase.

4. The lanthanum yttrium nickel-based hydrogen storage alloy according to claim 1, characterized by, The lanthanum yttrium nickel-based hydrogen storage alloy is composed of A2B7 phase and A5B 19 phases.

5. The lanthanum yttrium nickel-based hydrogen storage alloy according to claim 1, characterized by, M is greater than or equal to 0.5 and less than or equal to 1.2, and p is greater than or equal to 4 and less than or equal to 4.

5.

6. The lanthanum yttrium nickel-based hydrogen storage alloy according to claim 1, characterized by, A is greater than or equal to 0.5 and less than or equal to 0.8, and b is greater than or equal to 0.3 and less than or equal to 0.

4.

7. The lanthanum yttrium nickel-based hydrogen storage alloy according to any one of claims 1 to 6, characterized by, The lanthanum-yttrium-nickel hydrogen storage alloy has the composition shown in one of the following: LaCeY4Ni 20 Mn 0.6 V 0.4 ; LaCeY4Ni 20.1 Mn 0.6 V 0.3 ; LaCeY4Ni 20.2 Mn 0.6 V 0.2 ; La 0.5 CeY 4.5 Ni 20 Mn 0.6 V 0.4 ; La 0.5 CeY 4.5 Ni 20.1 Mn 0.6 V 0.3 ; La 0.5 CeY 4.5 Ni 20.2 Mn 0.6 V 0.2 .

8. The production method of a lanthanum-yttrium nickel-based hydrogen storage alloy according to any one of claims 1 to 7, characterized by, The method comprises the following steps: The raw materials provided according to the composition of the lanthanum-yttrium-nickel hydrogen storage alloy are melted to form an alloy liquid; the alloy liquid is rapidly quenched to form an alloy sheet; then the alloy sheet is heated from an initial temperature to 650-950℃ at a heating rate of 3-18℃ / min, and then heated to 950-1250℃ at a heating rate of 1-15℃ / min, and annealed for 10-20h to complete the annealing.

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