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Self-templated fabrication of micro/nano structured iron fluoride for high-performance lithium-ion batteries
Journal of Power Sources ( IF 8.1 ) Pub Date : 2018-06-16 , DOI: 10.1016/j.jpowsour.2018.06.048
Jingru Zhai , Zhengyu Lei , David Rooney , Huaguo Wang , Kening Sun

Hexagonal-tungsten-bronze-type (abbreviated as HTB) FeF3·0.33H2O has been recognized as a promising high-rate cathode material for lithium-ion batteries. However, rational engineering of advanced structures is highly desirable yet challenging to activate the insulating FeF3·0.33H2O in practical application. For the first time, a facile and economical solvothermal strategy is demonstrated to synthesize micro/nanostructured FeF3·0.33H2O through the self-templated morphology evolution and topotactic phase transformation of commercial FeF3·3H2O precursor. Benefiting from the hierarchical structure, the as-prepared FeF3·0.33H2O exhibits enhanced rate capability and cycle stability compared with the bulk FeF3·0.33H2O obtained through traditional heat treatment of FeF3·3H2O. More interestingly, simple adjustment of the synthesis solvent or temperature enables the fabrication of several iron-based fluorides with uniquely hierarchical morphology, which are still hard to be synthesized under the existing methods.



中文翻译:

用于高性能锂离子电池的微/纳米结构氟化铁的自模板制造

六方钨青铜型(缩写为HTB)FeF 3 ·0.33H 2 O被认为是锂离子电池的一种有前途的高倍率正极材料。然而,先进的结构合理的工程是非常可取的但具有挑战性的激活绝缘FEF 3 ·0.33H 2 ö在实际应用中。对于第一次,以容易和经济的溶剂热策略证明合成微/纳米结构的FEF 3 ·0.33H 2通过商业FEF的自模板形态的演变和局部规整相变ö 3 ·3H 2 ö前体。得益于分层结构,已制备的FeF 3与传统的FeF 3 ·3H 2 O热处理制得的本体FeF 3 ·0.33H 2 O相比,·0.33H 2 O表现出更高的速率能力和循环稳定性。更有趣的是,通过简单地调节合成溶剂或温度即可进行制备几种具有独特分层形态的铁基氟化物,在现有方法下仍很难合成。

更新日期:2018-06-16
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