Black phosphorus-titanium dioxide-carbon composite anode material and preparation method thereof, and application of black phosphorus-titanium dioxide-carbon composite anode material

Abstract

The invention discloses a black phosphorus-titanium dioxide-carbon composite anode material and a preparation method thereof, and application of a black phosphorus-titanium dioxide-carbon composite anode material. The preparation method comprises the following steps that: red phosphorus is subjected to a ball-milling reaction in an inert gas protective atmosphere to obtain nanoscale black phosphorus; black phosphorus, titanium dioxide and a carbon material are mixed in an inert gas protective atmosphere to obtain a mixture, and ball milling on the mixture is performed to obtain a black phosphorus-titanium dioxide-carbon composite anode material. Carbon and black phosphorus are linked through a C-P bond, so that tight contact between black phosphorus and the carbon material in the chargingand discharging process is guaranteed, and volume change in the black phosphorus lithium intercalation process is relieved. Ti-O-P bonds exist between titanium dioxide and black phosphorus, the utilization rate of the active material black phosphorus can be effectively increased, and the electron migration rate at the interface is increased. The black phosphorus-titanium dioxide-carbon composite anode material prepared by the invention is used as a lithium ion battery anode material, and shows the excellent cycle performance and the relatively high reversible capacity.

Description

technical field

[0001] The invention relates to a battery material that can be used to prepare lithium ion batteries, in particular to a black phosphorus-titanium dioxide-carbon composite negative electrode material and its preparation method and application. Background technique

[0002] Lithium-ion battery (LIB) is a relatively mature rechargeable battery at present. It not only has the characteristics of high specific capacity, long cycle life, no memory effect, low self-discharge rate, etc., but also has little pollution, meets environmental protection requirements, and can be widely used in Electric vehicles, aerospace, biomedical engineering and other fields. With the rapid development of science and technology around the world, the advancement of lithium-ion battery technology can no longer meet the growing needs of emerging energy applications, which usually require higher power / energy density and longer life, especially in power energy market as well as the grid en...

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