a2b7 type gadolinium-containing nickel hydrogen storage alloy, negative electrode, battery and preparation method

A technology of hydrogen storage alloy and negative electrode, which is applied in the field of negative electrode, battery and its preparation, and hydrogen storage alloy. It can solve the problems of poor self-discharge characteristics, improve self-discharge characteristics, increase cycle life, improve activation cycle times and high temperature The effect of discharge capacity

Active Publication Date: 2021-06-11
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above hydrogen storage alloys do not belong to A 2 B 7 type, and poor self-discharge characteristics

Method used

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  • a2b7 type gadolinium-containing nickel hydrogen storage alloy, negative electrode, battery and preparation method
  • a2b7 type gadolinium-containing nickel hydrogen storage alloy, negative electrode, battery and preparation method

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preparation example Construction

[0092] The hydrogen storage alloy of the present invention can be prepared by various methods. For example, including high-temperature melting and casting method, high-temperature melting-rapid quenching method, mechanical alloying method, powder sintering method, high-temperature melting-gas atomization method, reduction diffusion method, replacement diffusion method, combustion synthesis method, self-propagating high-temperature synthesis method and chemical method. Specifically, the method for preparing the hydrogen storage alloy of the present invention includes: (1) a step of forming an alloy sheet or an alloy block; (2) a heat treatment step. The metal raw material is smelted, then flaked to form alloy flakes or cast into alloy blocks, and then heat treated to obtain A 2 B 7 gadolinium-containing nickel hydrogen storage alloy.

[0093] In step (1), the overall composition satisfies RE x Gd y Ni z-a-b mn a al b Under the protection of inert gas, the metal raw mate...

Embodiment 1

[0107] According to the formula in Table 1, the metal raw materials Ni, Mn, Al, La, and Gd were placed in the vacuum melting furnace from the bottom to the top in sequence, and then the vacuum melting furnace was purged with argon for 5 times, and then Vacuumize the vacuum melting furnace to an absolute vacuum of ≤5Pa, and fill it with argon to a relative vacuum of -0.055MPa. The vacuum melting furnace is heated to 1300°C, and the heating is stopped after the metal raw materials in the furnace are completely melted into a metal solution. Cast the molten metal to a cooling copper roll, and flake it into an alloy sheet with a thickness of 0.2 mm. The alloy sheet was placed in an environment with an absolute vacuum of 0.01 Pa and protected by argon, and heat-treated at 875° C. for 16 hours to obtain a gadolinium-containing nickel hydrogen storage alloy.

[0108] The pressure-composition-isothermal (P-C-T) curve of gained gadolinium-containing nickel hydrogen storage alloy sees ...

Embodiment 2

[0110] According to the formula in Table 1, the metal raw materials Ni, Mn, Al, La, and Gd are placed in the vacuum melting furnace from the bottom to the top in sequence, and then the vacuum melting furnace is purged with argon for 5 times, and then Vacuumize the vacuum melting furnace to an absolute vacuum of ≤5Pa, and fill it with argon to a relative vacuum of -0.055MPa. The vacuum melting furnace is heated to 1300°C, and the heating is stopped after the metal raw materials in the furnace are completely melted into a metal solution. Cast the molten metal to a cooling copper roll, and flake it into an alloy sheet with a thickness of 0.2 mm. The alloy sheet was placed in an environment with an absolute vacuum of 0.01 Pa and protected by argon, and heat-treated at 950° C. for 16 hours to obtain a gadolinium-containing nickel hydrogen storage alloy.

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Abstract

The invention discloses a 2 B 7 Gadolinium-containing nickel hydrogen storage alloy, negative electrode, battery and preparation method. The hydrogen storage alloy has RE x Gd y Ni z‑a‑b mn a Al b Composition; RE is selected from one or more elements in La, Ce, Pr, Nd, Y, Sm and Sc; x, y, z, a and b represent the mole fraction of each element; x>0, y≥ 1, and y+x=6; 22>z≥19; 9≥a+b>0. The nickel-based hydrogen storage alloy electrode of the invention has higher maximum discharge capacity, longer service life and less self-discharge.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, a negative electrode, a battery and a preparation method. Background technique [0002] As anode materials for nickel-metal hydride (MH-Ni) secondary batteries, hydrogen storage alloys have been widely used. With the rapid growth of demand for nickel-metal hydride batteries for new energy vehicles, smart grid energy storage, and communication base station reserve power, the global market demand for hydrogen storage alloys will also increase rapidly, and higher requirements are also put forward for the comprehensive performance of hydrogen storage alloys. Require. It is an urgent task to develop advanced hydrogen storage alloys with high capacity and long life, especially higher requirements for high-temperature discharge capability and self-discharge characteristics. [0003] CN1165542A discloses a kind of hydrogen storage alloy, and its chemical composition is (R 1-x L x )(Ni 1-y m y ) z , R ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02H01M4/24H01M4/38H01M10/30
CPCC22C1/026C22C19/03C22C2202/04H01M4/242H01M4/383H01M10/30H01M2004/027Y02E60/10
Inventor 闫慧忠熊玮王利周淑娟李金张旭赵玉园李宝犬徐津郑天仓
Owner BAOTOU RES INST OF RARE EARTHS
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