Nickel -hydride battery electrode hydrogen alloy LANI5 advantages and disadvantages.solar energy storage batteries

　　LANI5 is a metal intervertebral compound with a CACU5 lattice structure. At room temperature, it can be hydrogenated with several atmospheric hydrogen pressure to generate LANI5H6 with a hexagonal lattice structure. The hydrogenation reaction is as follows:

　　LANI5+3H2 → LANI5H6

　　The advantages of large hydrogen absorption, easy activation, difficulty in poisoning, moderate balancing pressure, small lag, etc.

　　advantage:

　　LANI5 hydrogen absorption generates LANI5H6, the more 1.4%WT. The decomposition pressure of 25 ° C is about 0.2MPa, and the decomposition heat -30.1kJ/molh, 2, which is very suitable for operation at room temperature environment. Lanis is made into negative electrode materials, and the electrode is composed of a battery with Ni (OH) 2, and the theoretical electrochemical capacity of LANI5 is 372mA-H/G. It is considered to be candidate materials in applications such as heat pumps, batteries, air conditioners.

　　shortcoming:

　　LANI5 alloys have high hydrogen storage capacity and good pneumatic dynamic characteristics; the volume of the crystal cells after alloy hydrogen absorption is large. With the continuation of the charging and discharge cycle, the crystal lattice deforms Large, its capacity is rapidly attenuated.

　　shortcoming:

　　However, the capacity of the LANIS electrode decreases with the number of charging loops, so the battery life is short.

　　The volume of the crystal cells is expanded in the process of hydrogen and the hydrogen cycle (about 23.5%). In the Lavi5 alloy, only a metal intervertebral compound is formed only in a narrow composition range. The chemical measurement is slightly shifted to the rich LA side, and the rich LA phase is easy to precipitate in the mother phase crystal world. In this way, due to hydrogenation, the volume of the crystal world has changed a lot, which has promoted powdery.

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