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Do you know how is battery made? Today I will take Ni-mh battery and Li-ion Battery as examples to tell you the pricinple of them.

Nickel-Cadmium Batteries–Ni-mh rechargeable battery

Smaller than the lead acid variety are nickel-cadmium, or NiCd batteries. These rechargeable batteries use nickel oxide hydroxide as the cathode and metallic cadmium as the anode, with potassium hydroxide as the electrolyte. These batteries need to use their full charge before being recharged and are very dependable, still used today in harsh conditions where other batteries may fail. Their cadmium components, however, can become dangerous if overcharged, producing a hydrogen gas, and NiCd batteries can also suffer from “memory” problems. When recharged before being completely depleted, they tend to only discharge from the point they were last charged, leading to energy loss.

Because of the problems with cadmium, the more efficient nickel metal hydride, or NiMH, batteries were created. These use hydrogen as the anode instead of cadmium and can hold higher, longer-lasting charges than NiCd batteries. NiMH batteries have a variety of applications and can replace both lead acid batteries in cars and primary batteries used to charge everyday devices.

Li-ion Batteries

Lithium ion, or Li-ion batteries, are a more recent form of rechargeable battery wholesale. Due to their longevity, efficiency, lightweight properties and compact size, they have become the most popular choice for long-term battery use, especially in cell phones, computers and other electronic devices. These batteries use lithium and carbon for their electrodes. Since lithium is a very reactive element, it can hold a large amount of energy and loses only a small portion of it over time. The memory effect does not apply to Li-ion batteries, so they can be recharged at any time during their discharge period.