Facile Fabrication of Hierarchical LiMnPO4 Microspheres for High-Performance Lithium-Ion Batteries Cathode
Facile Fabrication of Hierarchical LiMnPO4 Microspheres for High-Performance Lithium-Ion Batteries Cathode
复制标题
轻松制备用于高性能锂离子电池正极的多级 LiMnPO4 微球
DOI：
10.1149/2.0401902jes
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发表时间：
2019-01-10
影响因子：
3.9
通讯作者：
Zong, Lingbo
中科院分区：
文献类型：
--
作者：
Li, Junzhe;Luo, Shao-hua;Zong, Lingbo
开发先进的正极材料以实现高功率应用是锂离子二次电池的一项重要技术。本文以MnCO 3微球为自牺牲模板，设计并制备了多级LiMnPO 4微球。具有高振实密度和更多暴露的活性位点的新型分级结构有利于电解质渗透，并且还为快速Li离子嵌入和脱嵌反应提供足够的接触面积。此外，均匀的薄碳层从LiMnPO 4微球的内部延伸到外部，可以进一步构建导电和坚固的碳网络，这将不可避免地加速电子的传输，提高放电容量。具体地，实现了0.05 C下158.4mAh g（-1）和5 C下104.3mAh g（-1）的高可逆容量。此外，在5 ℃下200次循环后保持了98%的上级容量保持率，显示出优异的循环稳定性。这项工作可能为制备其他先进电极材料开辟了一个有前途的策略。(C)2019电化学学会。
Developing advanced cathode materials to achieve the high-power applications is an important technology for the rechargeable lithium-ion batteries. In this work, hierarchical LiMnPO4 microspheres are designed and fabricated using MnCO3 microspheres as the self-sacrificial template. The novel hierarchical structure with high tap density and more exposed active sites is favorable for the electrolyte penetration and also provides sufficient contact areas for fast Li-ion intercalation and deintercalation reaction. In addition, the uniform thin carbon layer extending from the interior to the outside of the LiMnPO4 microsphere, could further construct a conductive and robust carbon network, which will inevitably accelerate the transport of electrons and improve the discharge capacity. Specifically, a high reversibility capacity of 158.4 mAh g(-1) at 0.05 C and 104.3 mAh g(-1) at 5 C is achieved. Furthermore, the superior capacity retention with 98% after 200 cycles at 5 C is maintained, revealing an excellent cycle stability. This work may open up a promising strategy to prepare other advanced electrode materials. (C) 2019 The Electrochemical Society.