Lithium battery anode structure, preparation method thereof and lithium battery structure

Abstract

The invention relates to the technical field of lithium batteries, in particular to a lithium battery anode structure, a preparation method thereof and a lithium battery structure. The lithium batteryanode structure comprises an anode current collector and an anode thin film layer formed on the anode current collector, wherein the anode thin film layer is prepared from an anode material, and a transition layer and a decoration layer are sequentially formed on the side, away from the anode current collector, of the anode thin film layer. The transition layer is arranged on the anode thin filmlayer, and can effectively reduce the interfacial resistance between an anode thin film and the decoration layer, the decoration layer on the transition layer can effectively stop direct contact of electrolyte and the anode thin film layer, an irreversible reaction between the trace amount of HF (hydrogen fluoride) in the electrolyte and the anode battery structure containing the decoration layeris avoided, meanwhile, collapse of the anode structural layer under a high voltage charging state is restrained, and accordingly the reversible capacity and the circularity of a battery produced by utilizing the anode structural layer are improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery cathode structure, a preparation method thereof, and a lithium battery structure. 【Background technique】 [0002] Lithium batteries have the advantages of high energy density and output working voltage, and are widely used in digital electronic products, electric vehicles and large-scale energy storage. The cathode material is an important part of the lithium battery, which directly affects the capacity, cycle performance and other parameters of the lithium battery. Common cathode materials include lithium iron phosphate, lithium cobaltate, lithium manganese oxide, and ternary materials. However, under high voltage, the cathode material structure will undergo irreversible collapse, resulting in rapid capacity fading. In addition, during the charge and discharge process of lithium batteries, a layer of solid electrolyte interfacial film (SEI film) w...

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Problems solved by technology

[0003] In order to overcome the problem that the current lithium ion positive electrode structure is prone to irreversible collapse, resulting in low electric energy capacity of the ion battery structure and poor charge-discharge cycle effect, the present invention provides a lithium battery positive electrode with stable structure, high electric energy specific capacity, and good charge-discharge cycle performance. Lithium battery positive electrode structure with good effect and preparation method thereof

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