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- Title
Position‐Responsive SEI Layer in Bicomponent‐Bidirectional Gradient Current Collector Induces Homogenized Ion Flux for Highly Reversible Li Metal Anode.
- Authors
Yin, Xiangkai; Zhu, Runxi; Hu, Xiaofei; Zhao, Hongyang; Li, Xinyang; Liu, Limin; Niu, Shuwen; Wang, Jiazheng; Meng, Yi; Su, Yaqiong; Ding, Shujiang; Yu, Wei
- Abstract
A gradient current collector (GCC) can encourage preferential Li metal deposition on the more lithiophilic/conductive bottom of 3D anodes, enhancing the reversibility of the battery. However, as the deposition proceeds, the reduction of lithophilicity/conductivity easily causes the disturbance of Li+ flux. Herein, a brand‐new bicomponent‐bidirectional gradient current collector (BGCC) is proposed. The BGCC constructs slow‐release additives with reverse gradient distribution (SA gradient) based on GCC, allowing it to build a position‐responsive solid electrolyte interface layer. Additionally, as the deposition amount increases, the slow‐release additives will release more and present a stronger ability to regulate Li+ flux, ensuring the anodereversibility under large deposition amounts conditions. Consequently, asymmetric cells can exhibit high reversibility with an average coulomb efficiency (CE) of 97.8% and sustain over 200 cycles using carbonate‐based electrolytes. The Li@BGCC||LiFePO4 full cells hold a capacity retention of 94.8% over 400 cycles with thin Li. Notably, even at low temperatures, the Li@BGCC anodes can exhibit a CE as high as 98.46% and excellent capacity retention of 97.8% after 100 cycles paired with NCM811 cathodes. This strategy opens up a new direction for the development of 3D current collectors.
- Subjects
SOLID electrolytes; METALS; LOW temperatures; CATHODES; ELECTROLYTES; IONIC conductivity
- Publication
Advanced Functional Materials, 2024, Vol 34, Issue 9, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202310358