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.

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。