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Can "defective" improve the performance of 18650 lithium battery 3000mah?
Recently, scientists at Rice University's Brown School of Engineering discovered that placing specific defects in the crystal lattice of a lithium iron phosphate cathode can widen the channels for lithium ions.
Their theoretical calculations could improve performance by two orders of magnitude and point the way to similar improvements in other types of batteries.
These defects, called countersites, form when atoms are placed in the wrong location in the lattice—that is, when iron atoms are in the positions that lithium should occupy.
Anti-site defects hinder the movement of lithium within the crystal lattice and are generally considered detrimental to battery performance.
However, taking lithium iron phosphate as an example, researchers found that they create many detours inside the cathode, allowing lithium ions to reach the reaction front over a wider surface, which helps improve the charge and discharge rate of lithium-ion batteries.
The research was published in the Nature journal Computational Materials.
"Without defects, lithium can only access this small region near the phase boundary," said Tang, assistant professor of materials science and nanoengineering.
"However, antisite defects can make the insertion of lithium ions on the lithium ion surface more uniform, so the lithium ion interface moves faster and the battery charges faster."
"If you apply a large voltage and force a non-defective cathode to charge quickly, you will have a very high local lithium flux at the cathode surface, which can cause damage to the cathode," he said.
“With structural materials like steel and ceramics, people have been exploiting defects to make the material stronger,” he said, “but we haven’t talked much about exploiting defects to make better battery materials.”
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