Lithium-Ion Charged Polymer Channels Flattening Lithium Metal Anode  

作　　者：Haofan Duan Yu You Gang Wang Xiangze Ou Jin Wen Qiao Huang Pengbo Lyu Yaru Liang Qingyu Li Jianyu Huang Yun‑Xiao Wang Hua‑Kun Liu Shi Xue Dou Wei‑Hong Lai 

机构地区：[1]Hunan Provincial Key Laboratory of Thin Film Materials and Devices,School of Material Sciences and Engineering,Xiangtan University,Xiangtan 411105,People’s Republic of China [2]Guangxi Key Laboratory of Low Carbon Energy Materials,School of Chemical and Pharmaceutical Science,Guangxi Normal University,Guilin 541004,People’s Republic of China [3]Institute for Superconducting and Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,Innovation Campus,Squires Way,North Wollongong,NSW 2500,Australia [4]Institute of Energy Materials Science,University of Shanghai for Science and Technology,Shanghai 200093,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第4期379-393,共15页纳微快报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.22205191 and 52002346);the Science and Technology Innovation Program of Hunan Province(No.2021RC3109);the Natural Science Foundation of Hunan Province,China(No.2022JJ40446);Guangxi Key Laboratory of Low Carbon Energy Material(No.2020GXKLLCEM01)。

摘　　要：The concentration difference in the near-surface region of lithium metal is the main cause of lithium dendrite growth.Resolving this issue will be key to achieving high-performance lithium metal batteries(LMBs).Herein,we construct a lithium nitrate(LiNO_(3))-implanted electroactiveβphase polyvinylidene fluoride-co-hexafluoropropylene(PVDF-HFP)crystalline polymorph layer(PHL).The electronegatively charged polymer chains attain lithium ions on the surface to form lithium-ion charged channels.These channels act as reservoirs to sustainably release Li ions to recompense the ionic flux of electrolytes,decreasing the growth of lithium dendrites.The stretched molecular channels can also accelerate the transport of Li ions.The combined effects enable a high Coulombic efficiency of 97.0%for 250 cycles in lithium(Li)||copper(Cu)cell and a stable symmetric plating/stripping behavior over 2000 h at 3 mA cm^(-2)with ultrahigh Li utilization of 50%.Furthermore,the full cell coupled with PHL-Cu@Li anode and Li Fe PO_(4) cathode exhibits long-term cycle stability with high-capacity retention of 95.9%after 900 cycles.Impressively,the full cell paired with LiNi_(0.87)Co_(0.1)Mn_(0.03)O_(2)maintains a discharge capacity of 170.0 mAh g^(-1)with a capacity retention of 84.3%after 100 cycles even under harsh condition of ultralow N/P ratio of 0.83.This facile strategy will widen the potential application of LiNO_(3)in ester-based electrolyte for practical high-voltage LMBs.

关 键 词：Polymer ionic channel Li metal batteries Artificial protective layer Uniform Li deposition Electrochemical performances 

分 类 号：O631[理学—高分子化学] TM912[理学—化学]