Preparation of lithium iron phosphate with superior electrochemical performances from titanium white by-product ferrous sulfate

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2024-10-11 DOI:10.1016/j.ssi.2024.116715

Pengsen Wu , Longfei Zhao , Yang Wang , Jiajia Ge , Zijin Li , Zhenzhen Li , Guanzhou Qiu

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引用次数: 0

Abstract

In this paper, FePO₄∙2H₂O and FePO₄ have been successfully accomplished by utilizing titanium white by-product ferrous sulfate via two-step synthesis method, which is further employed to react with Li₂CO₃ via carbothermal reduction to prepare LiFePO₄ cathode materials. The composition and structure characteristics of obtained samples are studied in detail by TG-DSC, XRD, XPS, FESEM and TEM, and the electrochemical performances of prepared LiFePO₄ are also carefully investigated. The results indicate that the discharge specific capacity of LiFePO₄ synthesized from FePO₄ achieves 162.4 and 153.7 mAh∙g⁻¹ at 0.1C and 1C, which is 2.2 and 2.9 mAh∙g⁻¹ higher than that from FePO₄∙2H₂O, and the capacity retention rate reaches as high as 97.5 % after 450 cycles at 1C, correspondingly 94.8 % for LiFePO₄ from FePO₄∙2H₂O. It is mainly ascribed to the smaller particle size of LiFePO₄ synthesized from FePO₄, and the intimately ordered interface structure between the carbon layer and LiFePO₄, which greatly promotes the migration of lithium ions in the lithiation and delithiation process.

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用钛白副产品硫酸亚铁制备具有优异电化学性能的磷酸铁锂

本文利用钛白副产物硫酸亚铁，通过两步合成法成功制备了FePO4∙2H2O和FePO4，并进一步通过碳热还原法与Li2CO3反应制备了LiFePO4正极材料。通过 TG-DSC、XRD、XPS、FESEM 和 TEM 等方法详细研究了所得样品的组成和结构特征，并对制备的磷酸铁锂的电化学性能进行了细致的研究。结果表明，以 FePO4 为原料合成的 LiFePO4 在 0.1C 和 1C 下的放电比容量分别达到 162.4 和 153.7 mAh∙g-1，比以 FePO4∙2H2O 为原料合成的 LiFePO4 高 2.2 和 2.9 mAh∙g-1，并且在 1C 下循环 450 次后容量保持率高达 97.5%，相应地，以 FePO4∙2H2O 为原料合成的 LiFePO4 的容量保持率为 94.8%。这主要归因于由 FePO4 合成的 LiFePO4 的粒度较小，碳层与 LiFePO4 之间的界面结构紧密有序，在锂化和脱锂过程中极大地促进了锂离子的迁移。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.