标题: Molecular-Level Anion and Li<SUP>+</SUP> Co-Regulation by Amphoteric Polymer Separator for High-Rate Stable Lithium Metal Anode

作者: Li, SZ (Li, Shizhen); Yang, HQ (Yang, Hangqi); Geng, MZ (Geng, Mengzi); Do, HN (Do, Hainam); Peng, C (Peng, Chuang)

来源出版物: NANO LETTERS  卷: 24  期: 1  页: 486-492  DOI: 10.1021/acs.nanolett.3c04333  出版年: DEC 26 2023  

摘要: Regulating ion transport is a prevailing strategy to suppress lithium dendrite growth, in which the distribution of ion regulatory sites plays an important role. Here a hyperbranched polyamidoamine (HBPA) grafted polyethylene (PE) composite separator (HBPA-g-PE) is reported. The densely and uniformly distributed positive -NH2 and negative -CHNO- groups efficiently restrict the anion migration and promote Li+ transport at the surface of the lithium metal anode. The obtained Li foil symmetric cell delivers a stable cycle performance with a low-voltage hysteresis of 130 mV for over 1500 h (3000 cycles) at an ultrahigh current density of 20 mA cm(-2) and a practical areal capacity of 5 mAh cm(-2). Moreover, HBPA-g-PE separator enables a practical lithium-sulfur battery to achieve over 200-cycle stable performance with initial and retained capacity of 700 and 455 mAh g(-1), at a high sulfur loading of 4 mg cm(-2) and a low electrolyte content/sulfur loading ratio of 8 mu L mg(-1).

作者关键词: stable lithium metal anode; anion-cation coregulation; hyperbranched polyamidoamine; lithiophilic and anionphilicsites; lithium sulfur battery

地址: [Li, Shizhen; Yang, Hangqi; Geng, Mengzi; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Do, Hainam] Univ Nottingham Ningbo China, Key Lab Carbonaceous Waste Proc & Proc Intensifica, Ningbo 315100, Peoples R China.

通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Do, HN (通讯作者)，Univ Nottingham Ningbo China, Key Lab Carbonaceous Waste Proc & Proc Intensifica, Ningbo 315100, Peoples R China.

电子邮件地址: Hainam.Do@nottingham.edu.cn; Chuang.peng@whu.edu.cn

影响因子：10.8