Constructing the high-areal-capacity, solid-state Li polymer battery via the multiscale ion transport pathway design
Volume 56, Issue , Page 53–65
| Kefan Zhou, Donghao Ma, Helin Wang, Xiaoyu Tang, Miao Bai, Fu Liu, Zhiqiao Wang, Yue Ma
Abstract
The parasitic Li dendrite formation and retarded ion diffusion dynamics inhibit the deployment of solid-state batteries (SSBs) at high areal capacity loadings. Here, we present the modular design of the Li+ percolating network by grafting the ionic-conductive polyether amine (PEA) at the multiple scales: the PEA modified zinc hydroxystannate (PEA@ZHS) (flame retardant units) and polyamide 6 (mechanical rigid units) are coherently introduced to optimize the PEO-based solid electrolyte (PX-PEA@ZHS) with the Young's modulus (3.41 GPa), ionic conductivity (4.29 × 10−4 S cm−1 at 55 °C) and flame retardancy (22% reduction of heat release rate); on the other hand, PEA molecules are grafted onto the acetylene black additive to establish the dual conductive network, endowing two orders of magnitude increase of ionic conductivity for the high-compaction cathodes. The as-integrated symmetric cell exhibits a critical current density up to 0.8 mA cm−2 and cycling endurance for 1000 h at 0.2 mA cm−2; upon the SSBs assembly with the record high loading of LiFePO4 (12.4 mg cm−2), the high-areal-capacity, cycling stability as well as the extreme temperature endurance till 110 °C are simultaneously realized, which inspire the rational design of commercially feasible, energy-dense, flame-resistance energy storage prototype.
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DOI: 10.1016/j.mattod.2022.04.004
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