A kind of lithium ion battery positive pole piece and lithium ion battery that can supplement lithium

Abstract

The invention discloses a lithium ion battery positive plate capable of supplementing lithium and a lithium ion battery containing this positive plate. This positive pate can provide the lithium source at the first charging, thereby placing the effect of compensating the lithium consumption when the positive and the negative form an SEI film, the first charging / discharging efficiency and the cycle performance are promoted, and the charging capacity and the energy density can be promoted, the lithium ion battery positive plate is especially suitable for the negative system with the low first charging / discharging efficiency, such as: the negative system containing silicon, silicon alloy, silicon oxide, or tin, tin alloy, and tin oxide.

Description

technical field The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion battery positive pole piece capable of replenishing lithium And a lithium-ion secondary battery containing the positive electrode sheet. Background technique Lithium-ion secondary batteries have the advantages of high voltage and high energy density, and are widely used in power supplies for consumer electronics, energy storage systems, and power systems. Improving the energy density of lithium-ion batteries has always been the most concerned industry and academia question. During the first charging process of the battery, the surface solid electrolyte film (SEI film) formed on the surface of the positive and negative electrodes will consume lithium and irreversibly solidify lithium into lithium carbonate, alkoxide, ester salt, etc., resulting in a reversible loss of lithium. , reduce the first efficiency and reduce the battery discharge capacit...

AI Technical Summary

Problems solved by technology

When using lithium metal, the requirement for the dryness of the environment is high. Powdered lithium metal has a very high reactivity, is flammable, and is easy to splash. It is difficult to manufacture and process. Lithium metal may remain inside the battery, which may bring potential dangers in subsequent use. ;When using organolithium solution, the danger brought by the powder can be avoided, but organolithium is often more active, and often needs to be protected by an inert atmosphere during the manufacturing process and cannot be manufactured and processed in the air, and is also very sensitive to moisture. Difficult to be compatible with existing processes

Images