Enhanced performance of flexible quasi-solid-state lithium batteries with high-loading cathode enabled by laser drilling

阴极 电解质 材料科学 锂(药物) 电化学 电极 电池(电) 化学工程 复合数 复合材料 纳米技术 化学 工程类 物理 内分泌学 物理化学 功率(物理) 医学 量子力学
作者
Shaoping Wu,Hongpeng Zheng,Nan Zhang,Weizheng Cheng,Hezhou Liu,Huanan Duan
出处
期刊:Journal of Power Sources [Elsevier BV]
卷期号:542: 231782-231782 被引量:10
标识
DOI:10.1016/j.jpowsour.2022.231782
摘要

Gel electrolyte composite with high areal capacity cathode effectively improves battery energy density and safety. Still, the insufficient interface contact between electrolyte and electrode limits the capacity release inside the thick cathode. Here, we rationally design a self-supporting cathode and use the in-situ polymerization method to integrate the gel electrolyte with the cathode. This cathode can effectively reduce the content of inactive electrode components. Meanwhile, the design of the regularly-arranged pore structure of the cathode introduced by laser texturing facilitates the penetration of the prepolymer solution and enables outstanding lithium-ion transport. Notably, the quasi-solid LiFePO4/Li half-cell with active material loading of 8 mg cm−2 exhibits good electrochemical performance (118.5 mAh g−1 after 100 cycles at 0.2C at room temperature). Moreover, when the loading of active materials increases to 30 mg cm−2, the LiFePO4/Li4Ti5O12 full-cell can still have a relatively high discharge capacity (105.9 mAh g−1 after 400 cycles at 0.2C at room temperature). It is worth noting that the quasi-solid pouch cell prepared by in-situ polymerization has a certain flexibility, indicating that this strategy has application potential in flexible electronic devices.
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