Stannic oxide-cobalt monooxide composite thin film material, lithium battery and preparation method

Abstract

The embodiment of the invention discloses a stannic oxide-cobalt monooxide composite thin film material, a lithium battery and a preparation method. The stannic oxide-cobalt monooxide composite thin film material comprises stannic oxide layers and cobalt monooxide layers, wherein the stannic oxide layers and the cobalt monooxide layers are arranged at intervals; the thickness of the stannic oxide layers or the cobalt monooxide layers is 2nm to 50nm; the total number of the stannic oxide layers or the cobalt monooxide layers is 20 to 100. The stannic oxide-cobalt monooxide composite thin film material prepared by an alternative deposition method has the advantages that when the stannic oxide-cobalt monooxide composite thin film material is used for preparing a cathode of a lithium ion battery, the good electromechanical property is realized; on one hand, the stannic oxide and the cobalt monooxide are alternatively distributed, so that the stress caused by volume change is effectively buffered, the structure integrity is further maintained, and the cycle stability is improved; on the other hand, the metal Co (cobalt) generated in the CoO (cobalt monooxide) energy storage reaction has the function of catalyzing the electrode charging and discharging reaction activity, and the rate performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a tin dioxide-cobaltous oxide composite thin film material, a lithium battery and a preparation method. Background technique [0002] Lithium-ion battery is a new type of high-efficiency chemical power source, with the advantages of high energy density, long cycle life, high operating voltage, no memory effect, small self-discharge and wide operating temperature range, it is an ideal chemical for various portable electronic products today. The power supply is also the preferred power supply for electric vehicles in the future, with broad application space and economic value. [0003] Lithium-ion batteries usually consist of a positive electrode, a negative electrode, and an electrolyte. When charging a lithium-ion battery, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the e...

AI Technical Summary

Problems solved by technology

[0005] In the embodiment of the present invention, a kind of tin dioxide-cobaltous oxide composite thin film material, lithium battery and preparation method are provided to solve the problem of tin-based electrodes caused by lithium metallization and dealloying of tin-based electrodes in the prior art. Severe mechanical strains will eventually lead to cracks or pulverization of tin-based electrodes

Images