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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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結晶および無形配列で定義されたペプトイドブロックコポリマー電解質における形態学-伝導性の関係
Jing Sun1, Xunxun Liao, Andrew M Minor
1Molecular Foundry, ‡Materials Sciences Division, and §Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California , Berkeley, California 94720, United States.
Journal of the American Chemical Society
|September 25, 2014
まとめ
ポリマーのリチウムイオン伝導性は,無形状態と結晶状態で比較可能であり,充電式リチウム電池のイオン輸送機構に関する以前の仮定に異議を唱えます.
科学分野:
- 材料科学 材料科学とは
- ポリマー化学のポリマー化学について
- 電気化学 電気化学について
背景:
- リチウムイオンを伝導するポリマーは,充電可能なリチウム電池にとって不可欠です.
- イオン輸送は,通常,無形なゴムのようなポリマーのセグメンタル運動に起因する.
研究 の 目的:
- アモルフォのポリマー領域と結晶のポリマー領域の両方でリチウムイオン伝導性を調査する.
- 異なる物質状態の化学的に類似したポリマーブロックにおけるイオン輸送を比較する.
主な方法:
- サブモノマー固体相合成を用いたシーケンス定義のディブロックコポリペプトイドの合成.
- 2つの類似のコポリペプトイドを製造し,同等の導電性ブロックが,異なる無形 (pNeh) と結晶 (pNdc) の非導電性ブロックを持つ.
- 自己組み立てにより,ラメラー形状に組み合わされ,異なる無形および結晶の導電領域を作成します.
主要な成果:
- エチレンオキシを含むドメインは,無形または結晶であることにかかわらず,比較可能なリチウムイオン伝導性を示した.
- 導電ブロック (pNte) は,片方のコポリペプトイドでは無形であり,もう片方のコポリペプトイドでは結晶であり,直接比較が可能であった.
- この研究は,異なった結晶性を持つ類似したポリマー領域におけるイオン輸送を研究するためのプラットフォームを成功裏に作成しました.
結論:
- ポリマードメインの物質の状態 (アモルフォス対結晶) は,リチウムイオン伝導性に大きな影響を与えない.
- この発見は,リチウム電池用のポリマー電解質におけるイオン輸送機構の従来の理解に挑戦しています.
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