Previously, lithium metal batteries were disposable (as opposed to rechargeable lithium-ion batteries). They used lithium metal as electrodes to generate electricity through the corrosion or oxidation of lithium metal. Like other dry cell batteries, they were discarded after use and could not be recharged.
Lithium metal batteries use lithium metal electrodes, which have extremely high energy density, far exceeding that of dry cell batteries made of other materials. This provides ample power for devices that require long-term power supply, such as portable devices like cameras.
The most produced lithium metal battery is the button cell, which is usually used for timing in computers or devices and can last for several years, even as long as the computer itself.
It is understood that the new generation of lithium metal batteries is now a rechargeable battery and is expected to be used in electric vehicles.
Working principle of lithium metal batteries
Previously, lithium metal batteries worked on the same principle as ordinary dry cell batteries. They used lithium metal as electrodes and generated electrical energy through the corrosion or oxidation of lithium metal. Once the battery was used up, it was unusable and could not be recharged.
The advantages of lithium metal batteries are also obvious. Lithium metal battery technology is an engineering breakthrough that will greatly improve battery performance, enhance battery lifespan, significantly improve the economic efficiency of energy storage, promote the upgrading and transformation of consumer electronics products, and have significant implications for human life.
Lithium metal batteries (LMBs) are batteries that use lithium metal as the negative electrode, while the positive electrode material can be oxygen, elemental sulfur, metal oxides, or other substances. LMBs are among the most promising next-generation high-energy-density storage devices, capable of meeting the stringent requirements of emerging industries. However, the direct application of lithium metal can lead to safety issues, poor rate and cycle performance, and even the fragmentation of the negative electrode material inside the battery.
Characteristics of lithium metal batteries
Lithium metal is highly reactive and has strong reducing properties. Therefore, the density it exhibits during deposition is very important. This density can effectively reduce the contact area between lithium metal and the electrolyte, while also avoiding some side effects, thereby promoting the growth of cycle life.
Lithium metal has a theoretical specific capacity of 3860 mAh/g and excellent conductivity, making it an ideal anode material for lithium-ion batteries. However, lithium metal anodes face problems such as lithium dendrite formation and dead lithium during use, which not only seriously affect the cycle performance of lithium metal batteries but also cause serious safety hazards.
Lithium-metal batteries, developed by SolidEngergy at MIT, can reduce the size of current lithium-ion batteries by half, potentially enabling their use in electric vehicles. This engineering breakthrough significantly improves battery performance, extends battery life, dramatically enhances the economics of energy storage, and promotes the upgrading and transformation of consumer electronics, holding profound significance for human life.
