Preparation method of lithium-philic carbon nanotube paper and preparation method of composite metal lithium negative electrode

Abstract

The invention provides a preparation method of lithium-philic carbon nanotube paper. The preparation method comprises the following steps of: forming a lithium-philic material coating layer on the surface of a carbon nanotube by adopting an atomic layer deposition method, and manufacturing paper with pulp by adopting a wet papermaking process. The invention further provides a preparation method ofa composite metal lithium negative electrode. The preparation method comprises the steps: heating the solid state lithium to molten state, and then injecting lithium in a high-temperature molten state into the lithium-philic carbon nanotube paper. According to the preparation method, a uniform and compact lithium-philic coating layer is formed on the surface of the carbon nanotube by adopting anatomic layer deposition technology so that the nucleation barrier of lithium deposition is reduced, lithium metal is uniformly deposited in the carbon paper, and the prepared composite lithium metal negative electrode has the effects of inhibiting lithium dendritic crystal growth and modifying the components of a solid electrolyte interface film; meanwhile, space is provided for lithium metal deposition, the cycling stability of the lithium metal negative electrode is remarkably improved, and the cycling life is remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a preparation method of lithium-friendly carbon nanotube paper and a preparation method of a composite metal lithium negative electrode. Background technique [0002] Since the 21st century, mobile electronic information products have developed rapidly, and the capacity requirements for energy storage batteries have become increasingly stringent. The energy density of traditional lithium-ion batteries is close to the upper limit, making it difficult to meet the needs of 3C products. Li metal anode has attracted extensive attention due to its ultra-high specific capacity of 3860mAh / g and the lowest reduction potential of -3.04V. However, metal lithium anodes have been difficult to be applied in practice so far, mainly because of the problems of dendrite growth and low Coulombic efficiency during the battery cycle: on the one hand, lithium ion deposition is ...

AI Technical Summary

Problems solved by technology

However, metal lithium anodes have been difficult to be applied in practice so far, mainly because of the problems of dendrite growth and low Coulombic efficiency during the battery cycle: on the one hand, lithium ion deposition is greatly affected by the current density, the larger the current, the more lithium ion deposition Faster, the more conducive to the growth of dendrites, until it pierces the separator to cause an internal short circuit in the battery, there is a danger of battery combustion explosion; on the other hand, lithium metal has strong chemical activity, and will continue to have side reactions with the electrolyte, resulting in low Coulombic efficiency

In addition, metal foam or carbon fiber is relatively hard, which is easy to pierce the separator and cause a short circuit of the battery, which poses a potential safety risk