Lithium metal composite strip capable of inhibiting dendritic crystal growth and production equipment and energy storage device thereof

Abstract

The invention discloses a lithium metal composite strip for inhibiting dendrite growth. The strip comprises a lithium metal strip, the lithium metal strip comprises a lithium metal layer, and a lithium alloy layer for inhibiting lithium dendrite is arranged on the lithium metal layer. The invention further discloses an energy storage device, the energy storage device comprises a positive electrodeand a negative electrode, an electronically insulated and ion-conducting electrolyte is arranged between the positive electrode and the negative electrode, and the positive electrode and / or the negative electrode are / is made of the lithium metal composite strip. The invention further discloses production equipment of the lithium metal composite strip capable of inhibiting dendritic crystal growth. The equipment comprises: an unwinding mechanism which is used for winding metal bands; a coating section which is used for coating the surface of the lithium metal layer with the liquid lithium alloy layer, and the shaping section is internally provided with a cooling device, so that the liquid lithium alloy layer is cooled and shaped, the lithium alloy layer is formed on the surface of the lithium metal layer, and a lithium metal composite strip is obtained; and a winding mechanism which is used for winding the obtained lithium metal composite strip.

Description

technical field [0001] The invention relates to the technical field of energy storage equipment, in particular to a lithium metal composite strip that inhibits dendrite growth, its production equipment, and an energy storage device. Background technique [0002] Li dendrite growth is one of the fundamental issues affecting the safety and stability of Li-ion batteries. The growth of lithium dendrites will lead to the instability of the electrode and electrolyte interface during the cycle of lithium-ion batteries, destroying the generated solid electrolyte interface (SEI) film, and the growth of lithium dendrites will continue to consume the electrolyte and lead to metal lithium The irreversible deposition of dead lithium leads to low coulombic efficiency; the formation of lithium dendrites can even pierce the diaphragm and cause short-circuiting inside the lithium-ion battery, causing thermal runaway of the battery to cause combustion and explosion. [0003] The Chinese pate...

AI Technical Summary

Problems solved by technology

The tin composite lithium electrode sprays a layer of tin powder on the metal lithium sheet, although it can inhibit the growth of dendrites, but the tin powder layer will block the conduction of the separator and even lead to ion isolation, resulting in an increase in the internal resistance of the battery.

In addition, the particle size of the tin powder is relatively large, and the thickness of the metal lithium sheet is required to be larger than the particle size of the tin powder. Therefore, the thickness of the metal lithium sheet is thicker, resulting in a mismatch in the capacity between the electrodes, resulting in material waste and increased manufacturing costs. and reduce the energy density of energy storage devices

Images