Electrode pole piece, manufacturing method thereof and semi-solid battery

Abstract

The invention provides an electrode pole piece, a manufacturing method thereof and a semi-solid battery. The manufacturing method of the electrode pole piece comprises the following steps of (1) preparing a core-shell material of which the inner core is formed by lithium and the outer shell is formed by an ionic conductive polymer; (2) preparing an electrode slurry, and coating the electrode slurry on a pole piece, the electrode slurry comprising the core-shell material; and (3) carrying out hot rolling treatment on the coated pole piece to obtain the electrode pole piece. According to the manufacturing method of the present invention, firstly, the surfaces of lithium metal particles are coated with the ionic conductive polymer material to form the core-shell material, the core-shell material is added into the electrode pole piece, and is heated and rolled to form the electrode pole piece, so that during the heating and rolling process, the ionic conductive polymer is molten to form alithium ion conductive network, and the polymer electrolyte is more uniformly distributed in the electrode pole piece, and a lithium ion channel is improved, and accordingly the first reversible capacity of the semi-solid battery is improved by supplementing the lithium ions.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular, to electrode pole pieces, a manufacturing method thereof, and a semi-solid battery. Background technique [0002] With the rapid development and progress of society, the problem of energy shortage and environmental pollution is becoming more and more serious, and people's demand for clean energy is becoming more and more important. At the same time, the popularity of new energy vehicles has led to the expansion of energy and 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 the 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 difficult. The process ...

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.

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