Nickel-hydrogen cell electrode and its preparing method

Abstract

Electrode of nickel-hydrogen battery includes foaming nickel sheets and Nano carbon tubes formed on the foaming nickel sheets. The said foaming nickel sheets are as conductive substrate and current collection body. The said Nano carbon tubes are formed on surface of the foaming nickel sheets and inside pores. Moreover, Nano carbon tubes are contacted to the foaming nickel sheets directly. The method includes step of generating Nano carbon tubes on foaming nickel sheets through chemical vapor deposition, and sintering step for making Nano carbon tubes integrate with foaming nickel sheets hard. Comparing with prior art, the invention provides features of higher hydrogen capacity stored, no any bonding agent so as to obtain advantages of raised conductivity, reduced resistance of electrode, in favor of charging and discharging electricity in large current, and prolonged cycle life.

Description

【Technical field】 [0001] The invention relates to a nickel-hydrogen battery, in particular to a negative electrode of the nickel-hydrogen battery and a preparation method thereof. 【Background technique】 [0002] Ni-MH batteries are developed from Ni-Cd batteries. Compared with Ni-Cd batteries, Ni-MH batteries greatly improve the memory effect of Ni-Cd batteries, do not use cadmium metal which is harmful to the environment, and have a larger capacity than Ni-Cd batteries. Improvement is a secondary battery with high energy density, long cycle life, and less environmental pollution. It is often used in mobile phones, notebook computers, digital cameras and other electronic products. [0003] The composition of Ni-MH battery mainly includes positive electrode, negative electrode, separator, electrolyte and so on. [0004] Generally speaking, the active material of the positive electrode of the nickel-metal hydride battery is nickel hydroxide powder, and a small amount of addit...

AI Technical Summary

Problems solved by technology

[0010] However, when applied to the negative electrode of a nickel-metal hydride battery, the above-mentioned composite hydrogen storage material needs to be bonded to the conductive substrate with a binder, so that the composite hydrogen storage material powder and the conductive substrate can be firmly combined into one, and the binder cannot Avoid affecting the direct contact between the composite hydrogen storage material powder particles and between the composite hydrogen storage material and the conductive substrate, resulting in an increase in the resistance of the negative electrode

Thereby, the high-current charge-discharge capability of the nickel-metal hydride battery containing the negative electrode is weakened, and the charge-discharge cycle life is reduced.

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