Lithium ion battery and anode plate thereof

Abstract

The invention provides a lithium ion battery and an anode plate thereof. The anode plate of the lithium ion battery comprises an anode current collector and an anode active substance layer applied on the anode current collector, wherein the anode active substance layer comprises an anode active material, a conducting agent and a bonding agent; the anode active substance layer also comprises a lithium-containing compound; the general formula of the lithium-containing compound is Li<3-x>AxN<1-y>Dy; before the formation of the lithium ion battery prepared by using the anode plate of the lithium ion battery, the lithium ion battery is firstly subjected to precharging so as to decompose the lithium-containing compound. The anode plate of the lithium ion battery can reduce the inreversible volume loss of the first cycle circulation of the lithium ion battery; the energy density of the lithium ion battery is improved; the side reaction in the charging and discharging process is reduced; the circulation performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and its anode sheet. Background technique [0002] Lithium-ion batteries are widely used in portable devices such as notebooks and mobile phones, and are also considered to be the key technology for next-generation vehicles. Almost all car manufacturers have launched one or more electric drive vehicles. Although lithium-ion batteries have many advantages, such as high voltage and long life, and have broad prospects in the automotive field, the energy density of lithium-ion batteries cannot meet the requirements of electric vehicles for lithium-ion batteries. [0003] Lithium-ion batteries usually use graphite, silicon, etc. as the anode active material. During the first charging process of lithium-ion batteries, when the electrode potential (vs. Li / Li+) of the anode is lower than 0.8V, the lithium ions released from the cathode will be consumed...

AI Technical Summary

Problems solved by technology

Although this method improves the first-week efficiency of lithium-ion batteries, it is easy to generate dust during the production process by using this method, which will cause harm to the human body, and adding lithium metal to the anode sheet of the lithium-ion battery reduces the electrode potential of the anode. Causes increased side reactions at the electrode-electrolyte interface, reducing efficiency and capacity during cycling

The Chinese patent document CN102916164A published on February 6, 2013 realizes "wet lithium supplementation" by spraying or dripping the organic lithium solution on the surface of the positive electrode. The sprayed organic lithium solution is directly reduced to metal lithium and embedded in the positive electrode. In the film, although the process is simple and the cost is low, the safety problem is still prominent and the operability is not strong.

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