Electrode pole piece and method of making the same, semi-solid battery

Abstract

The invention proposes an electrode pole piece, a manufacturing method thereof, and a semi-solid battery. The method for making an electrode sheet includes: (1) preparing a core-shell material, wherein the inner core of the core-shell material is formed of lithium and the outer shell is formed of an ion-conducting polymer; (2) preparing an electrode slurry, and coating the electrode slurry with cloth on the pole piece, wherein the electrode slurry includes the core-shell material; (3) the coated pole piece is subjected to hot rolling treatment to obtain the electrode pole piece. In the production method proposed by the present invention, the surface of the lithium metal particles is firstly coated with an ion conductive polymer material to form a core-shell material, and the core-shell material is added to the electrode pole piece and heated and rolled to form the electrode pole piece. During the process, the ion-conducting polymer is melted to form a lithium-ion conductive network, and the polymer electrolyte is more uniformly distributed in the electrode plates, which improves the lithium-ion channel, thereby improving the first reversible capacity of the semi-solid battery by replenishing lithium ions.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular, to an electrode pole piece and a manufacturing method thereof, and a semi-solid battery. Background technique [0002] With the rapid development and progress of society, the problems of energy shortage and environmental pollution are becoming more and more serious, and people's demand for clean energy has become increasingly important. At the same time, the popularization of new energy vehicles has expanded the development of energy power, prompting people to develop lithium-ion batteries with higher energy density. At this stage, commercial lithium batteries have reached the bottleneck of energy density, and it is difficult to improve in terms of high energy density. As the next generation of batteries, solid-state batteries have been referred to the position of cutting-edge research, but the research and development of solid-state batteries is difficult and difficu...

AI Technical Summary

Problems solved by technology

[0005] The silicon negative electrode has a high theoretical specific capacity (up to 4200mAh / g), but it also has a very serious volume expansion problem, and the first reversible capacity is low, which is due to the formation of an alloy between silicon and lithium ions during charge and discharge. Most of the lithium ions are difficult to come out after entering, resulting in a decrease in the first reversible capacity. Therefore, supplementing lithium ions to the negative electrode material is the key to improving the first reversible capacity.

Images