基于优化制备工艺的富锰碳包覆阴极的Fe掺杂抑制晶格畸变：优化条件下的改性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.334

Xinran Li , Longjiao Chang , Shaohua Luo , Ruifen Yang , Zenglei Hou , Jie Zou

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引用次数: 0

摘要

为了解决目前橄榄石结构的聚阴离子材料LiMnPO4的低电子导电性和离子扩散问题，本研究旨在优化制备工艺，并在碳涂层改性的同时进行Fe掺杂。采用溶胶-凝胶法制备了LiMn1-xFexPO4/C （x = 0.1, 0.2, 0.3, 0.4）样品。在制备过程中，通过调整煅烧时间和温度，确定了最佳条件：在750℃下煅烧20 h，理想掺杂水平为x = 0.3，得到的LiMn0.7Fe0.3PO4/C具有优异的电化学性能，其中，在1℃的速率下，首次放电容量为173.67 mAh·g−1，循环100次后的容量保持率为98.1%。研究表明，优化焙烧条件可以细化晶粒，减少团聚，显著提高炭包覆后的电化学性能。

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Fe doping of carbon-coated manganese-rich cathode based on optimized preparation process to inhibit lattice distortion: Modification under optimal conditions

To address the issues of low electronic conductivity and ion diffusion in the current olivine-structured polyanionic material LiMnPO₄, this study aims to optimize the preparation process and implement Fe doping alongside carbon coating modifications. Samples of LiMn_1-xFe_xPO₄/C (x = 0.1, 0.2, 0.3, 0.4) were synthesized using the sol-gel method. By adjusting both calcination time and temperature during sample preparation, optimal conditions were established: calcination at 750°Cfor 20 h with an ideal doping level of x = 0.3 yielding LiMn_0.7Fe_0.3PO₄/C exhibiting superior electrochemical performance, specifically, a first discharge capacity of 173.67 mAh·g⁻¹ and a remarkable capacity retention rate of 98.1 % after 100 cycles at a rate of 1 C was achieved. Studies indicate that optimizing calcination conditions can refine grain size and reduce agglomeration, significantly enhancing the electrochemical performance post carbon coating.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.