Lithium battery, negative plate thereof and preparation method of negative plate

Abstract

The invention discloses a lithium battery, a negative plate thereof and a preparation method of the negative plate. According to the present invention, the lithium battery negative plate comprises: a negative electrode functional layer, the negative electrode functional layer comprises a negative electrode current collector provided with a plurality of pores, a lithium-loving layer and a lithium-repellent layer, the negative electrode current collector has a first plating layer surface and a second plating layer surface opposite to each other, and the pores penetrate through the negative electrode current collector in the direction from the first plating layer surface to the second plating layer surface; the lithium-loving layer is arranged on the first plating layer surface, and the lithium-repellent layer is arranged on the second plating layer surface; and the electrolyte layer is coated on the surface of the negative electrode functional layer, and at least part of the electrolyte layer is positioned in the pores. Compared with the prior art, the volume energy density and the mass energy density of the battery are improved, and the cycle service life of the battery is longer.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium ion batteries, and in particular to a lithium battery, a negative electrode sheet thereof, and a method for preparing the negative electrode sheet. Background technique [0002] Lithium batteries have received extensive attention due to their high energy density and long cycle life. However, safety issues and limited energy density are the two main problems faced by current liquid lithium-ion batteries. Safe solid-state electrolyte batteries have gradually become the first choice, but The poor interfacial wettability of the solid electrolyte hinders the transmission of lithium ions, which affects the service life and energy density of the lithium battery. Using lithium metal instead of graphite as the negative electrode can significantly increase the energy density of the lithium battery, but the charging and discharging process of the lithium metal battery , when lithium...

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Problems solved by technology

[0002] Lithium batteries have received extensive attention due to their high energy density and long cycle life. However, safety issues and limited energy density are the two main problems faced by current liquid lithium-ion batteries. Safe solid-state electrolyte batteries have gradually become the first choice, but The poor interfacial wettability of the solid electrolyte hinders the transmission of lithium ions, which affects the service life and energy density of the lithium battery. Using lithium metal instead of graphite as the negative electrode can significantly increase the energy density of the lithium battery, but the charging and discharging process of the lithium metal battery , when lithium metal is deposited-stripping-deposited on the negative electrode current collector, it will cause huge interlayer pores, and slowly the negative electrode and electrolyte layer will be separated from physical contact, resulting in a huge internal resistance of the battery, resulting in poor cycle performance of the battery, and even causing Open circuit, causing safety problems

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