Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment

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	Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment
	Peng, Zhe; Xu, Xiaoyue; Wang, Tao; Bi, Yujing; Liu, Meng; Yang, Wenchao; Wang, Deyu
刊名	JOURNAL OF POWER SOURCES
	2017
卷号	341 页码:175-182
ISSN号	0378-7753
英文摘要	LiMnPO4 has attracted massive interests due to its appropriate redox potential and the success of its iron comparative in the lithium ion batteries. The bulk substitution has been widely used to address the poor electrochemical activity of LiMnPO4, which is much lower than that of LiFePO4. In this work, we compare the performance of the core-shell structure and the homogeneous substitution with the same Mn/Fe molar ratio of LiMn0.8Fe0.2PO4. The core-shell phosphate material after carbon coating is composed of a core part of quasi-single LiMnPO4 phase, and a 3-4 nm' shell layer of quasi-single LiFePO4-phase, separated by the phase boundary with 1-2 nm thickness. It is interesting to reveal that the core-shell samples exhibit capacities of 156.4, 144.5, 128.2 mAh g(-1) under 0.1C, 1C and 5C respectively, which are 5-10% higher than that of the homogenous substituted LiMn(0.8)FecuPO(4) at the corresponding rates, while both of these samples present excellent cyclic stability, still retaining similar to 95% of the initial capacities after 1000 cycles under 1C discharging rate. Our results demonstrate that the main reason for LiMnPO4's poor electrochemical activity should be emphasized on the surface polarization, whereas the tardiness on bulk transportation is not as serious as it was presumed. (C) 2016 Elsevier B.V. All rights reserved.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/13986]
专题	2017专题
推荐引用方式 GB/T 7714	Peng, Zhe,Xu, Xiaoyue,Wang, Tao,et al. Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment[J]. JOURNAL OF POWER SOURCES,2017,341:175-182.
APA	Peng, Zhe.,Xu, Xiaoyue.,Wang, Tao.,Bi, Yujing.,Liu, Meng.,...&Wang, Deyu.(2017).Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment.JOURNAL OF POWER SOURCES,341,175-182.
MLA	Peng, Zhe,et al."Improvement of electrochemical activity of LiMnPO4-based cathode by surface iron enrichment".JOURNAL OF POWER SOURCES 341(2017):175-182.