Li-salt mediated Mg-rhodizonate batteries based on ultra-large cathode grains enabled by K-ion pillaring

doi:10.1016/j.ensm.2019.01.019

SIC OpenIR

	Li-salt mediated Mg-rhodizonate batteries based on ultra-large cathode grains enabled by K-ion pillaring
	Tian, Jing; Zhou, Xuejun; Wu, Qingping; Li, Chilin
	2019-11-01
Source Publication	ENERGY STORAGE MATERIALS
ISSN	2405-8297
Volume	22 Pages:218
Subtype	Article
Abstract	Mg-based batteries modulated by Li-salt additive can bypass the sluggish Mg solid diffusion at cathode side by kinetically better Li intercalation. However for this dual-salt system the highly electroactive cathodes endowed with high intrinsic conductivity and multi-electron transfer are still lacking, especially under large-sized grains and their high loading. Here a rhodizonate organic salt pre-pillared by K-ions (K2C6O6) is proposed as high-rate cathode for Li-salt mediated Mg batteries. Under a high loading of 70 wt%, well-crystallized K2C6O6 composed of ultra-large micro-sized grains (up to 30 mu m) shows a reversible capacity more than 300 mA h/g at 0.1 C (based on three electron transfer), and up to 200, 130 and 60mA h/ g at 2 C, 5 C and 10 C respectively. The high bulk electron/ ion conductivity and low solubility are responsible for such a superior performance based on fast Li-K electrochemical exchange and highly reversible Li intercalation without the assistance of nano-sizing, as a consequence of optimization and stabilization of desired electron structure and open framework by K-ion pre-supporting (instead of Li/Na-pillaring) and Mg-ion trapping between C6O62- layers. These large monoliths of K2C6O6 do not undergo serious grain fracture after long-term cycling, and at that time the Mg anode still remains compact and dendrite-free.
Keyword	Potassium rhodizonate Large-grain cathode Multi-electron transfer Mg-Li dual-salt electrolyte Mg batteries
DOI	10.1016/j.ensm.2019.01.019
Language	英语
WOS Research Area	Chemistry ; Science & Technology - Other Topics ; Materials Science
Publisher	ELSEVIER
Citation statistics	Cited Times:7[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/26745
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Tian, Jing,Zhou, Xuejun,Wu, Qingping,et al. Li-salt mediated Mg-rhodizonate batteries based on ultra-large cathode grains enabled by K-ion pillaring[J]. ENERGY STORAGE MATERIALS,2019,22:218.
APA	Tian, Jing,Zhou, Xuejun,Wu, Qingping,&Li, Chilin.(2019).Li-salt mediated Mg-rhodizonate batteries based on ultra-large cathode grains enabled by K-ion pillaring.ENERGY STORAGE MATERIALS,22,218.
MLA	Tian, Jing,et al."Li-salt mediated Mg-rhodizonate batteries based on ultra-large cathode grains enabled by K-ion pillaring".ENERGY STORAGE MATERIALS 22(2019):218.

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