Organophosphorus Hybrid Solid Electrolyte Interphase　Layer Based on Li_Xpo_4 Enables Uniform Lithium Deposition　for High-Performance Lithium Metal Batteries

Wang Qian; Wan Jing; Cao XinWen RuiGuo YuGuoLiu WenZhou Henghui

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Organophosphorus Hybrid Solid Electrolyte Interphase　Layer Based on Li_Xpo_4 Enables Uniform Lithium Deposition　for High-Performance Lithium Metal Batteries

机译：Organophosphorus Hybrid Solid Electrolyte Interphase　Layer Based on Li_Xpo_4 Enables Uniform Lithium Deposition　for High-Performance Lithium Metal Batteries

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摘要

Lithium metal is a promising anode candidate for the next-generation rechargeable battery system because of its highest specific capacity and lowest potential. However, low Coulombic efficiency (CE) and the formation of Li dendrites during the cycling process seriously hinder its practical application. Here, an organophosphorus hybrid flexible solid electrolyte interphase (SEI) layer is proposed based on a surface chelation strategy using phytic acid (PA) as Li metal surface treatment chemicals. Different from the traditional SEI layer, the polynuclear complex between PA and Li+ serves as a "connecter" in this SEI layer, which not only ensures its mechanical flexibility but also improves its lithiophilic property and ionic conductivity. With these advantages, the Li || Cu cells exhibit a high CE of 99.0% over 500 cycles at a current density of 0.5 mA cm(-2). Li || Li symmetrical cells can also maintain a stable Li plating/stripping process over 2500 h at a high current density of 10.0 mA cm(-2). Besides, all Li metal batteries (Li || S, Li || NCM, Li || LFP et al.) based on this strategy exhibit long cycling life and high capacity retention. This surface chelation strategy is believed to offer a new avenue to fabricate a stable and efficient SEI layer for practical application of Li metal batteries.

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来源
《Advanced functional materials》 |2022年第2期|2107923.1-2107923.8|共8页
作者
Wang Qian; Wan Jing; Cao XinWen RuiGuo YuGuoLiu WenZhou Henghui;
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作者单位

Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China;

Chinese Acad Sci, Key Lab Mol Nanostruct & Nanotechnol, Beijing Natl Lab Mol Sci, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Coll Sci, Beijing 100092, Peoples R China|Beijing Univ Chem Technol, Coll Energy, Beijing 100092, Peoples R ChinaPeking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China|Beijing Engn Res Ctr Power Lithium Ion Battery, Beijing 102202, Peoples R China;

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lithium dendrites; lithium metal anodes; lithium metal batteries; organic-inorganic composite layers; surface chelation;

Organophosphorus Hybrid Solid Electrolyte Interphase Layer Based on Li_Xpo_4 Enables Uniform Lithium Deposition for High-Performance Lithium Metal Batteries

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Organophosphorus Hybrid Solid Electrolyte Interphase　Layer Based on Li_Xpo_4 Enables Uniform Lithium Deposition　for High-Performance Lithium Metal Batteries