Negative plate of lithium ion battery, diaphragm and manufacturing method of negative plate and diaphragm

Abstract

The invention specifically relates to a negative plate of a lithium ion battery, a diaphragm and manufacturing methods thereof. The negative plate of the lithium ion battery comprises a negative substrate. At least a surface of the negative substrate is uniformly coated with an active material layer which is characterized in that the surface of at least an active material layer is coated with lithium metal. When the negative plate is applied to a lithium ion battery, lithium metal is subjected to a dissolution reaction due to local battery theory. Simultaneously, a SEI film is generated on the surface of the active material layer of the negative plate, and a few lithium ions are embedded into the active material. Thus, capacity of the lithium ion battery is raised so as to overcome the problem that mismatching between capacity of the manufactured negative pole and capacity of a positive pole is caused and performance of the positive pole cannot be fully performed due to high irreversible capacity of materials such as Sn, Si and the like. Capacity of the lithium ion battery is raised greatly. Therefore, the negative plate can be adopted to raise capacity of the lithium ion battery.

Description

【Technical field】 [0001] The invention belongs to the technical field of manufacturing methods of lithium-ion batteries, and in particular relates to a negative electrode sheet, a diaphragm and a manufacturing method of the lithium-ion batteries. 【Background technique】 [0002] Lithium-ion battery is a portable and environmentally friendly battery with high voltage, high energy density, long cycle life, and good safety performance. It has been widely used in portable electronic devices such as mobile phones, video recorders, and tablet computers. got some application. However, with the miniaturization of portable electronic devices, and the development and application of high-power devices such as electric vehicles (EV) and hybrid electric vehicles (HEV) have been highly valued, people require high-capacity lithium-ion batteries as power systems. and high power characteristics. [0003] In order to meet the requirements of high capacity and high power, researchers have con...

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Problems solved by technology

Although this method can play the role of lithium supplementation and increase the capacity of the battery, however, because the lithium powder is relatively light, it is easy to float in the air, which will cause a greater safety hazard to the operator.

[0006] In addition, the Japanese patent application with application number JP2008038720 mentions that a metal lithium layer is evaporated on the surface of the negative electrode sheet by vacuum evaporation. Although the thickness of the evaporated metal lithium layer is thinner than that of the metal lithium sheet, in the process The thickness of the evaporated metal lithium layer is difficult to control, and the whole process must be carried out in a vacuum environment, the evaporation efficiency is also low, the subsequent electrode sheet processing is also more complicated, and the production cost is higher

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