Achieving highly stable lithium-ion/metal hybrid batteries enabled by a functional electrolyte additive

被引：0

作者：

Qiu, Yu-Ping ^{[1
,2
]}

Shi, Yu-Peng ^{[1
,2
]}

Liu, Mao-Cheng ^{[1
,2
]}

Yang, Juan ^{[4
]}

Ma, Peng-Jun ^{[4
]}

Zhang, Xu ^{[4
]}

Yang, Bing-Jun ^{[4
]}

Xu, Jing ^{[3
]}

Liu, Bao ^{[3
]}

机构：

[1] State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou

[2] School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou

[3] Automotive Engineering Research Institute, Jiangsu University, Zhenjiang

[4] Research Center of Resource Chemistry and Energy Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou

来源：

Electrochimica Acta | 2025年 / 527卷

基金：

中国国家自然科学基金;

关键词：

Cycle stability; Electrolyte additive; Energy density; Hybrid Li-ion/metal anode; Lithiophilic Mg seeds;

D O I：

10.1016/j.electacta.2025.146250

中图分类号：

学科分类号：

摘要：

Lithium-ion batteries with graphite anodes are approaching their theoretical energy density limits. Hybrid Li-ion/metal anodes integrate Li-ion intercalation/deintercalation and Li metal deposition/stripping storage mechanisms, achieving substantial improvements in energy density. However, the practical application of Li-ion/metal hybrid anodes is limited by dendrite growth and significant volume changes. In this work, a soluble Mg(TFSI)2 electrolyte additive is introduced to form lithiophilic Mg seeds on the Li metal surface, which covers the defect sites of graphite substrate and promotes uniform Li deposition, thus achieving a stable anode interface and extended cycle life. As a result, the hybrid anodes realize stable cycling performance for 160 cycles at a controlled capacity of 744 mAh g-1 with an average Coulombic efficiency of 98.71 %. When paired with LiFePO4 cathodes, the full batteries achieve an energy density of 318.9 Wh kg-1 and exhibit remarkable capacity retention of 85.8 % after 600 cycles. Therefore, this work reports a novel electrolyte optimization strategy to enhance the energy density and cycling stability of hybrid anodes for advanced energy storage. © 2025

引用

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