A kind of magnesium-based hydrogen storage electrode alloy hydride and its preparation method and application
A technology of electrode alloys and hydrides, applied in battery electrodes, electrochemical generators, alkaline battery electrodes, etc., can solve the problems of low discharge capacity, energy consumption, and low product activity, and achieve high electrochemical capacity and simple process , low cost effect
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Embodiment 1
[0023] Mix Mg powder, Mn powder and Ni powder evenly in a molar ratio of 1.5:0.5:1, and use a planetary high-energy ball mill to perform mechanical ball milling pretreatment on the mixture. The mixture is protected in an argon atmosphere. The ball milling time is 8 hours, and the ball milling speed is 500rpm , The ball-to-material ratio is 40:1. Then press the obtained pretreated mixture powder into a block, put it in a hydrogen atmosphere reaction synthesis furnace with a pressure of 4.0MPa, raise the temperature to 600°C and keep it for 5h, then cool it down to 340°C and keep it for 1h, and finally cool it naturally to room temperature , to prepare magnesium-based hydrogen storage electrode alloy hydride Mg 1.5 mn 0.5 NeH m (m=1.5±0.1), its XRD structure test is as follows figure 1 , the hydride consists of Mg 3 MnNi 2 h n (93.8wt.%, n=3.0±0.1) main phase and Mg 2 NeH 4 , MnNi and Mn phase composition.
[0024] The electrochemical performance of the magnesium-based ...
Embodiment 2
[0027]Mix Mg powder, Mn powder and Ni powder evenly in a molar ratio of 2.2:0.2:0.6, and use a planetary high-energy ball mill to perform mechanical ball milling pretreatment on the mixture. The mixture is protected in an argon atmosphere, and the ball milling time is 5h, and the ball milling speed is 300rpm , The ball-to-material ratio is 20:1. Then press the obtained pretreated mixture powder into a block, put it in a hydrogen atmosphere reaction synthesis furnace with a pressure of 1.8MPa, raise the temperature to 500°C and keep it for 2h, then cool it down to 340°C and keep it for 1h, and finally cool it naturally to room temperature , prepared to contain Mg 3 MnNi 2 h n (50.2wt.%, n=1.0±0.1) as the main phase and MgH 2 and Mg 2 NeH 4 Magnesium-based hydrogen storage electrode alloy hydride Mg 2.2 mn 0.2 Ni 0.6 h m (m=3.4±0.05).
[0028] The electrochemical performance testing system and electrode sheet preparation method of the alloy hydride are the same as in E...
Embodiment 3
[0030] Mix Mg powder, Mn powder and Ni powder evenly in a molar ratio of 1.6:0.2:1.2, and use a planetary high-energy ball mill to perform mechanical ball milling pretreatment on the mixture. The mixture is protected in an argon atmosphere. The ball milling time is 10h, and the ball milling speed is 500rpm , The ball-to-material ratio is 50:1. Then press the obtained pretreated mixture powder into a block, put it in a hydrogen atmosphere reaction synthesis furnace with a pressure of 4.0 MPa, raise the temperature to 580°C and keep it for 10h, then cool it down to 340°C and keep it for 1h, and finally cool it naturally to room temperature , prepared to contain Mg 3 MnNi 2 h n (40.8wt.%, n=3.3±0.1), Mg 2 NeH 4 and MgNi 2 Magnesium-based hydrogen storage electrode alloy hydride Mg 1.6 mn 0.2 Ni 1.2 h m (m=1.5±0.05).
[0031] The electrochemical performance testing system and electrode sheet preparation method of the alloy hydride are the same as in Example 1. The initi...
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