Electrode and method for manufacturing same

Abstract

The invention relates to an electrode and a method for manufacturing the same. The electrode is manufactured by mixing slurry, coating, drying, rolling and cutting to shape, and includes a current collector and an electrode material layer coated on the surface of the current collector. The surface of the electrode material layer is arranged in a peak-valley shape after roughening treatment, and the roughening treatment step of electrode material layer is arranged after any step of drying, rolling or cutting to shape. According to the invention, the specific surface area of the electrode surface is increased by changing the surface morphology of the electrode, so that the electrode has a high specific surface area, the coating amount of an electrode active material can not be reduced, and the absorption rate and absorption amount of electrolyte by the electrode, thereby breaking the rule of a trade-off between rate and capacity and enabling the lithium battery to have both a high capacity density and improved rate performance, so that the lithium battery has high-rate charge and discharge characteristics; and a high coating amount of the electrode active material can better control stability of the prepared lithium battery, without foil leakage risks, thereby greatly reducing the security risks of lithium batteries.

Description

【Technical field】 [0001] The invention relates to the field of battery energy, in particular to an electrode and a manufacturing method thereof. 【Background technique】 [0002] In recent years, low-carbon economy has become a hot topic at home and abroad. As one of the most important components of low-carbon economy, "low-carbon travel" has attracted the attention of all walks of life. In the context of this general environment, lithium batteries widely used in the consumer electronics industry as new energy power batteries are considered to be the most suitable clean energy carriers for low-carbon vehicles that can achieve zero emissions. [0003] However, from the electronic market to the industrial upgrading of power batteries, it is difficult to obtain lithium batteries with good rate performance under high capacity density. At the same time, due to the limited process capability and process control capability of traditional lithium batteries, lithium batteries also ha...

AI Technical Summary

Problems solved by technology

[0003] However, from the electronic market to the industrial upgrading of power batteries, it is difficult to obtain lithium batteries that still have good rate performance at high capacity densities

At the same time, due to the limited process capability and process control capability of traditional lithium batteries, lithium batteries also have problems with process consistency and rate discharge capability, making the performance of lithium batteries unable to meet the requirements of power batteries

[0004] The traditional way to improve the rate performance of lithium batteries is to extend the area of ​​the electrodes and reduce the coating amount of active materials. Although this method can improve the rate performance of lithium batteries, it reduces the coating amount of active materials. It will inevitably increase the relative usage of matrix materials, and the energy density of batteries of the same size will decrease accordingly

At the same time, in order to obtain the highest rate charge and discharge performance, too thin coating amount will make the coating process difficult to control, and at the same time, it is very easy to cause the risk of foil leakage, causing safety hazards

Images