【科学60秒】海藻之于电池的神奇功效_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】海藻之于电池的神奇功效

听力简介：

Common batteries are electrochemical cells. And they may get better thanks to living cells: the multicellular organism called brown algae.

Lithium ion batteries include a binder. It holds the graphite nanoparticles that ___1___ the anode. The binder isn’t active, but researchers say it’s crucial in the battery’s stability. In theory, a silicon anode would make a better battery than graphite, but it’s not stable. Cracks form, and the battery ___2___. The researchers thought—could a silicon anode ___3___ a better binder?

Seawater has a high ___4___ of ions, much like the battery’s electrolyte. So the researchers thought that an organism that survives in seawater might provide a natural binder. They tested alginate from brown algae. And it provided such an effective binder for silicon nanoparticles that the system didn’t degrade. The result? A battery that can store more energy, is less expensive, can last longer and wouldn’t use as many toxic chemicals in the manufacturing.

The research is online in Science Express, in advance of publication in the journal Science. [Igor Kovalenko et al., "A Major Constituent of Brown Algae for Use in High-Capacity Li-Ion Batteries"]

The scientists will ___5___ their alginate efforts, in the hope that fast-growing brown algae can help contribute to our fast-growing battery economy.
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