Molybdenum disulfide nanosheet/nanocellulose/carbon nanotube/graphene composite lithium battery thin film negative electrode material and preparation method therefor

Abstract

The invention relates to a molybdenum disulfide nanosheet / nanocellulose / carbon nanotube / graphene composite lithium battery thin film negative electrode material and a preparation method therefor. The negative electrode material takes nanocellulose as the flexible substrate; the molybdenum disulfide nanosheet, the graphene nanosheet and the carbon nanotube are uniformly mixed and embedded in a network of the nanocellulose to form a flexible self-supporting thin film electrode material with a compact network structure, wherein the composition and the percentage of the thin film negative electrode material are as follows: 60-80wt% of molybdenum disulfide nanosheet, 10-30wt% of nanocellulose, 5-20wt% of carbon nanotube and 5-20% of graphene. By adoption of the method, the renewable energy resource-cellulose can be utilized reasonably and effectively, so that a metal aluminum foil or a copper foil is not required to be used as a current collector; a fluorine-containing polymer is not required to be used as a binder; therefore, influences and hazards to the ecological environment can be greatly avoided; the electrode obtained by the method can be directly filter-pressed, assembled and molded without a tabletting process, so that the preparation method is high in efficiency; and in addition, the thin film negative electrode material is high in mechanical flexibility and continuous bending stability.

Description

technical field [0001] The invention relates to a flexible lithium-ion battery film negative electrode material and a preparation method thereof, in particular to a molybdenum disulfide nanosheet / nanocellulose / carbon nanotube / Graphene composite flexible lithium battery film negative electrode material and preparation method thereof. Background technique [0002] With the rise of wearable electronic products, flexible electronics are developing towards portable, bendable, high-efficiency, low-cost and recyclable. The development of thin, light and flexible lithium-ion batteries with bending stability has become the frontier of research in the field of energy storage. one. However, the current coating and assembly process of lithium-ion batteries determines that traditional lithium-ion batteries cannot be bent. Bending will cause the electrode material to fall off from the current collector, affecting battery performance, and even puncturing the separator, resulting in a sho...

AI Technical Summary

Problems solved by technology

[0004] Molybdenum disulfide, as the negative electrode active material of lithium batteries, has the characteristics of high energy storage, but its application in lithium-ion batteries is limited due to its multi-layer flake shape, which is not easy to peel off.

The reported electrochemical performance of flexible Li-ion batteries, especially in terms of high-power performance (fast charging), has not yet reached the level of traditional Li-ion batteries, so the improvement in high-power performance is currently the research field of flexible Li-ion batteries. Difficulties, low lithium-ion mobility and conductivity are important reasons for limiting high-power performance. On the other hand, most of the flexible electrode research work is assembled into a button-type half-cell for electrochemical performance, and it is impossible to study the bending of flexible electrodes. The electrochemical performance in the state is far from the practical application