通过局部高浓度电解液的先进设计实现超稳定的 Li||LiFePO4 电池,Journal of Colloid and Interface Science

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通过局部高浓度电解液的先进设计实现超稳定的 Li||LiFePO4 电池
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2022-08-06 , DOI: 10.1016/j.jcis.2022.08.018
Yuansheng Lin ₁ , Xiangxin Zhang ₂ , Yongchuan Liu ₂ , Qichao Wang ₃ , Changxin Lin ₃ , Sujing Chen ₄ , Yining Zhang ₅

Affiliation

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.
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.
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.
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.
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.

通过高度兼容的电解质实现的高性能Li-LiFePO电池（Li||LFP）被认为是实现锂离子电池（LIB）系统稳定性和高能量密度的突破点。然而，目前流行的商业电解液很难同时与LFP正极和锂负极达到理想的兼容性。为此，我们设计了一种先进的基于醚的局部高浓度电解质（缩写为“ADE”），它与基于 LFP 的锂金属电池（Fb-LMB）具有极高的兼容性。配备 ADE 电解质的 Li||LFP 纽扣电池系统可以严格执行超过 4000 次快速充电/放电（分别为 3C 充电和 6C 放电）循环。与原始值相比，每个循环不仅平均仅损失0.145‱的容量，而且可以在高温下循环（60°C下>200次快速充电/放电循环）。在之前的报道中，这种性能在液体电解质系统中仍然很少见。电化学性能的显着增强可归因于LFP-正极/电解质和锂金属-负极/电解质界面的稳定。此外，由于其特定的溶剂化鞘结构，其润湿性和阻燃性能均优于对照组。这项工作扩大了设计基于稳定快速充电的LFP系统的空间，并揭示了用具有高能量密度和稳定循环性能的Li ||LFP配置取代最流行的石墨||LFP系统的可能性。

"点击查看英文标题和摘要"

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

The High-Performance Li-LiFePO 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.

更新日期：2022-08-06

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