Electrolyte

Topological Solid Polymer Electrolytes

Electrolyte

Topological Solid Polymer Electrolytes

Molecular engineering creates highly ion-conductive polymers for solid-state lithium batteries Current polymer electrolytes exhibit significantly lower ionic conductivity compared to their liquid and ceramic counterparts at room temperature, which hinders their widespread adoption in practical battery applications. Recent research demonstrates that strategic positioning of specific repeating units within alternating polymer sequences can dramatically enhance lithium ion (Li+) conductivity—by as much as three orders of magnitude under the room temperature. This study reveals that an alternating arrangement of fluorinated lithium salts and polyethylene oxide (PEO) side chains can increase the uniformity of ion distribution on a molecular level. This arrangement facilitates modulated complexation between anions and Li+, leading to enhanced Li+ dissociation. It also promotes a novel migration mechanism aided by the sequence of PEO, Li+, and anions. The construction of all-solid-state batteries incorporating this design exhibits stable, dendrite-mitigated performance.

Single-Ion Polymer Electrolytes (SIPE) Molecular engineering through topology control of polymer electrolytes can influence Li+ dissociation and conduction, which endows desirable chain mobility and overcomes the inherent limitation of ion conductivity.

Academia | P. 223 Source: Han, S., Wen, P., Wang, H. Zhou, Y., Gu, Y., Zhang, L., Shao-Horn Y., Lin, X., Chen, M.

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