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家园 按mit news的说法

About five years ago, however, Ceder and colleagues made a surprising discovery. Computer calculations of a well-known battery material, lithium iron phosphate, predicted that the material's lithium ions should actually be moving extremely quickly.

"If transport of the lithium ions was so fast, something else had to be the problem," Ceder said.

Further calculations showed that lithium ions can indeed move very quickly into the material but only through tunnels accessed from the surface. If a lithium ion at the surface is directly in front of a tunnel entrance, there's no problem: it proceeds efficiently into the tunnel. But if the ion isn't directly in front, it is prevented from reaching the tunnel entrance because it cannot move to access that entrance.

似乎是在变层所谓的通道口(或者说surface to the diffusion channel)做了一个量子阱,锂离子直接从那里走,从而提高迁移率。碳包覆应该是从晶格上做文章吧。这里还有一个他们的数据。

http://www.electrochem.org/meetings/scheduler/abstracts/214/0588.pdf

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