All-Cobalt-Free Layered/Olivine Mixed Cathode Material for High-Electrode Density and Enhanced Cycle-Life Performance

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Electronic Materials Letters Pub Date : 2024-09-12 DOI:10.1007/s13391-024-00521-z

Chang-Su Kim, Kookhan Kim, An-Seop Im, Sung-Su Kim, Jongmin Kim, Ji-Yong Eom

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Abstract

In this study, a high-energy-density electrode was fabricated by combining cobalt-free layered oxide (NM) with olivine LiFePO₄ (LFP) nanoparticles. The resulting mixed all-cobalt-free cathode electrode effectively minimized electrode porosity by filling the interstitial spaces between the micron-sized layered-oxide particles with nanoscale LFP particles, significantly improving electrode density, and exhibiting excellent electrode conductivity. Furthermore, the composite electrode composed of NM and LFP achieved a volumetric capacity exceeding 600 mAh/cm^− 3, comparable to that of typical layered oxide cathode materials, while also demonstrating enhanced cycle-life performance relative to electrodes composed solely of layered oxide or LFP. The enhanced electrochemical performance is attributed to the efficient lithium-ion and electron conduction facilitated by the intimate contact between NM and LFP particles, the suppression of NM particle degradation due to the relatively stable LFP particles on the NM surface, and the reduced particle fracture during roll-pressing. These improvements have been confirmed through electrochemical analyses and electrode observations.

Graphical Abstract

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全无钴层状/橄榄石混合阴极材料可实现高电极密度和更长的循环寿命性能

在这项研究中，通过将无钴层状氧化物（NM）与橄榄石型磷酸铁锂（LFP）纳米颗粒相结合，制造出了一种高能量密度电极。通过用纳米级 LFP 颗粒填充微米级层状氧化物颗粒之间的间隙，所得到的混合全无钴阴极电极有效地减少了电极孔隙率，显著提高了电极密度，并表现出优异的电极导电性。此外，由 NM 和 LFP 组成的复合电极的体积容量超过了 600 mAh/cm- 3，与典型的层状氧化物阴极材料相当，同时还显示出相对于仅由层状氧化物或 LFP 组成的电极更强的循环寿命性能。电化学性能的提高归功于 NM 和 LFP 颗粒之间的亲密接触促进了锂离子和电子的高效传导，NM 表面相对稳定的 LFP 颗粒抑制了 NM 颗粒的降解，以及辊压过程中颗粒断裂的减少。这些改进已通过电化学分析和电极观察得到证实。

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.