Trace Fluorinated Carbon Dots Driven Li‐Garnet Solid‐State Batteries

Author:

Zhu Fangjun1,Xu Laiqiang12,Hu Xinyu1,Yang Mushi1,Liu Huaxin1,Gan Chaolun3,Deng Wentao1,Zou Guoqiang1,Hou Hongshuai1,Ji Xiaobo1ORCID

Affiliation:

1. State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

2. College of Materials Science and Engineering Central South University of Forestry and Technology Changsha 410004 China

3. Zhangjiagang Guotai Huarong New Chemical Materials Co., Ltd Zhangjiagang 215600 China

Abstract

AbstractGarnet solid‐state electrolyte Li6.5La3Zr1.5Ta0.5O12 (LLZTO) holds significant promise. However, the practical utilization has been seriously impeded by the poor contact of Li|garnet and electron leakage. Herein, one new type of garnet‐based solid‐state battery is proposed with high performance through the disparity in interfacial energy, induced by the reaction between trace fluorinated carbon dots (FCDs) and Li. The work of adhesion of Li|garnet is increased by the acquired Li‐FCD composite, which facilitates an intimate Li|garnet interface with the promoted uniform Li+ deposition, revealed by density functional theory (DFT) calculations. It is further validated that a concentrated C−Li2O−LiF component at the Li|garnet interface is spontaneously constructed, due to the significant disparity in interfacial energy between C−Li2O−LiF|LLZTO and C−Li2O−LiF|Li. Furthermore, The electron transport and Li dendrites penetration are effectively hindered by the formed Li2O and LiF. The Li‐FCD|LLZTO|Li‐FCD symmetrical cells demonstrate stable cycling performance for over 3000 hours at 0.3 mA cm−2 and 800 hours at 0.5 mA cm−2. Furthermore, the LFP|garnet|Li‐FCD full cell exhibits remarkable cycling performance (91.6 % capacity retention after 500 cycles at 1 C). Our research has revealed a novel approach to establish a dendrite‐free Li|garnet interface, laying the groundwork for future advancements in garnet‐based solid‐state batteries.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Hunan Province

Publisher

Wiley

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