期刊
ENERGY STORAGE MATERIALS
卷 38, 期 -, 页码 249-254出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.03.017
关键词
All-solid-state lithium batteries; High energy density; Polydopamine-coated Li6PS5Cl; Thickness; Surface modification
资金
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China [U1964205, 51872303, 51902321]
- Zhejiang Provincial Natural Science Foundation of China [LD18E020004, LY18E020018]
- Ningbo S&T Innovation 2025 Major Special Programme [2018B10061, 2018B10087, 2019B10044]
- Jiangxi Provincial Key R&D Program of China [20182ABC28007]
- Youth Innovation Promotion Association CAS [2017342]
By coating a thin, homogenous polydopamine layer on Li6PS5Cl electrolyte particles, this study successfully enhanced the energy density of all-solid-state lithium batteries while maintaining high cycling stability. The energy density of the full-cell was increased by reducing the thickness and weight of the electrolyte layer.
All-solid-state lithium batteries with high safety and high energy density are one of the most promising next generation energy storage devices. However, the enhancement of energy density of all-solid-state lithium batteries is generally hindered by the thick and heavy solid electrolyte layer. In this work, a 5 nm thick homogeneous polydopamine layer is coated on the Li6PS5Cl electrolyte particles in organic alkali solution, resulting in a modified adhesive particle surface. Free-standing polydopamine-coated Li6PS5Cl thin film with thickness of 35 mu m could be achieved by cold pressing. All-solid-state lithium battery with the polydopamine-coated Li6PS5Cl thin film is assembled and exhibits a discharge capacity of 485.1 mAh g(-1) after 100 cycles with a capacity retention of 78.5% at 0.1 C and 25 degrees C. A high full-cell level energy density of 284.4 Wh kg(-1) can be realized with reduced thickness and weight of electrolyte layer.
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