Ultra-stable Li||LiFePO4 batteries via advanced designing of localized high concentration electrolyte

Yuansheng Lin; Xiangxin Zhang; Yongchuan Liu; Qichao Wang; Changxin Lin; Sujing Chen; Yining Zhang

doi:10.1016/j.jcis.2022.08.018

Ultra-stable Li||LiFePO₄ batteries via advanced designing of localized high concentration electrolyte

J Colloid Interface Sci. 2022 Dec 15;628(Pt B):14-23. doi: 10.1016/j.jcis.2022.08.018. Epub 2022 Aug 6.

Authors

Yuansheng Lin¹, Xiangxin Zhang², Yongchuan Liu³, Qichao Wang⁴, Changxin Lin⁵, Sujing Chen⁶, Yining Zhang⁷

Affiliations

¹ College of Chemistry, Fuzhou University, Fuzhou 350108, PR China; Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China. Electronic address: linyuansheng@fjirsm.ac.cn.
² Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China. Electronic address: xxzhang@fjirsm.ac.cn.
³ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China. Electronic address: liuyongchuan@fjirsm.ac.cn.
⁴ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: wangqichao@fjirsm.ac.cn.
⁵ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: linchangxin@fjirsm.ac.cn.
⁶ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China; Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, PR China.
⁷ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, PR China; Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: ynzhang@fjirsm.ac.cn.

PMID: 35973254
DOI: 10.1016/j.jcis.2022.08.018

Abstract

The High-Performance Li-LiFePO₄ batteries (Li||LFP) realized by highly compatible electrolytes are considered to be the breakthrough point to achieve the stability and high energy density of lithium-ion battery (LIB) systems. However, the current prevailing commercial electrolytes can hardly be compatible with both LFP cathode and lithium anode simultaneously to an ideal extent. On this very note, we designed an advanced ether-based localized high concentration electrolyte (abbreviated as "ADE"), which exhibits extreme compatibility with LFP-based lithium metal batteries (Fb-LMBs). Equipped with ADE-electrolyte, the Li||LFP coin cell system can carry out more than 4000 fast-charging/discharging (3C for charge and 6C for discharge, respectively) rigorously cycles. Each cycle can not only sacrifice just 0.145‱ capacity on average compared with the original value, but also cycle at elevated temp (>200 fast charging/discharging cycles under 60 °C). This performance remains rare in liquid electrolyte systems in previous reports. The significantly enhanced electrochemical performance can be ascribed to the stabilization of both LFP-cathode/electrolyte and Li-metal-anode/electrolyte interphases. In addition, due to its specific solvated sheath structure, its wettability and flame-retarding properties are superior to those of the control group. This work expands the space for designing a stable fast-charge LFP-based system and sheds light on the possibility of replacing the most popular graphite||LFP system with Li ||LFP configuration with high energy density and stable cyclic performance.

Keywords: Fast-charge/discharge; LFP-based Li metal batteries; Localized high concentration electrolyte; Long cyclic life.