Battery cell and lithium ion battery with battery cell

Abstract

The invention provides a battery cell and a lithium ion battery with the battery cell. The battery cell comprises a positive pole, a negative pole and a diaphragm between the positive pole and the negative pole. The positive pole comprises a positive pole current collector and a positive pole material layer on the surface of the positive pole current collector. The negative pole comprises a negative pole current collector and a negative pole material layer on the surface of the negative pole current collector. The positive pole material layer comprises a positive pole active material, a conductive agent and a positive pole binder. The negative pole material layer comprises a negative pole active material and a negative pole binder. The battery cell is characterized in that the battery cell also comprises a modification layer on the surface of the positive pole material layer and / or a modification layer on the surface of the negative pole material layer and the modification layer comprises a quinone compound. In a lithium ion battery, the battery cell improves lithium ion battery energy density and cycle and storage performances at a high temperature under high pressure.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an electric core and a lithium ion battery containing the electric core. Background technique [0002] Lithium-ion batteries are widely used for their high voltage, high capacity, low consumption, no memory effect, no pollution and small size. [0003] However, most of the currently prepared lithium-ion batteries are prone to gas production and rapid capacity decay during high-temperature storage or high-temperature cycling. In response to this technical problem, the existing prior art mentions that by coating the surface of the positive electrode material layer with trioxide Dialuminum layer or siloxane compound layer to reduce the reactivity between the positive electrode active material or the negative electrode active material and the electrolyte, so as to achieve the purpose of solving the above technical problems, but this kind of material is prone to coating during the...

AI Technical Summary

Problems solved by technology

[0003] However, most of the currently prepared lithium-ion batteries are prone to gas production and rapid capacity decay during high-temperature storage or high-temperature cycling. In response to this technical problem, the existing prior art mentions that by coating the surface of the positive electrode material layer with trioxide Dialuminum layer or siloxane compound layer to reduce the reactivity between the positive electrode active material or the negative electrode active material and the electrolyte, so as to achieve the purpose of solving the above technical problems, but this kind of material is prone to coating during the coating process. uneven, and the coating is easy to fall off during the use of the battery, so the above technical problems cannot be solved well

[0004] The prior art also discloses the use of 3-hydroxy-2-(4-pyridyl)-1,4-naphthoquinone as the negative electrode active material, and also discloses adding quinone compounds to positive electrode slurry or negative electrode slurry or electrolyte Moderate; the battery assembled with 3-hydroxy-2-(4-pyridyl)-1,4-naphthoquinone as the negative electrode active material has low voltage and low energy density, and the working range of lithium-ion batteries composed of this technology is 1.0V- 3.0V (vs. Li + / Li), the platform range is wide, and the cycle performance is poor; adding quinone compounds to the positive electrode slurry or negative electrode slurry not only affects the conductivity of the active material, but also changes in the properties of the quinone compound itself can cause the shedding of the active material; If quinone compounds are added to the electrolyte, the viscosity of the electrolyte will increase, which will also affect the performance of the battery