According to foreign media reports, a new study recently conducted by researchers at Stockholm University in Sweden has shown that a new method of recycling old batteries can result in better performance and cheaper rechargeable nickel-metal hydride batteries (NiMH). Dag Noréus, a professor at the Department of Materials and Environmental Chemistry at Stockholm University, said: "The new method can upgrade the recycled materials and use them directly in the production of new batteries."
The new recycling method includes mechanical cleaning to separate reusable electrode materials and corrosion products from old electrodes. "95% of the materials in the old batteries are useful, and several manufacturing steps can be saved in the manufacture of new batteries with better performance." Recycling will also be easier because the expensive remelting steps in traditional battery recycling can be eliminated, Thereby reducing costs.
A hydride battery, a so-called nickel-metal hydride battery, has a nickel electrode and a hydrogen electrode, in which hydrogen gas is stored in a metal hydride. This type of battery is one of the four basic rechargeable batteries currently on the market. Others include lithium batteries, nickel-cadmium batteries, or lead batteries.
As early as the 1990s, NiMH batteries were developed, used in hybrid vehicles such as Toyota Prius, and also used in electric toothbrushes, electric razors and other electrical appliances that are close to the human body because of such Electrical appliances need safer batteries, and cannot have the risk of explosion like lithium batteries. In addition, because NiMH batteries do not contain toxic heavy metals, they are also considered to be a more environmentally friendly battery.
The research initially focused on finding metal hydrides that can store large amounts of hydrogen in solid form. When successfully found, it is used for rechargeable batteries for the first time. Compared with nickel-cadmium batteries, the capacity of batteries with high hydrogen content has doubled. The researchers said: "Our research has made new discoveries, and new batteries made from new materials obtained through simplified recycling processes have better performance." (Yu Qiuyun)
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