文章信息/Info

Title:

Tetrazine-Linked Conjugated Microporous Polymers as Anode Materials for Li-Ion Battery

文章編號:

1674-3962(2023)12-0985-08

作者:

張夢慧; 高超; 施磊; 馬明明; 章沖; 孫呈郭; 杜楊; 胡炳成

南京理工大學化學與化工學院，江蘇 南京 210094

Author(s):

ZHANG Menghui; GAO Chao; SHI Lei; MA Mingming; ZHANG Chong; SUN Chengguo; DU Yang; HU Bingcheng

School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

關鍵詞:

共軛微孔聚合物; 四嗪; 鋰離子電池; 增容; 負極材料

Keywords:

conjugated microporous polymer;  tetrazine;  lithium-ion battery;  capacity�瞚ncrease;  anode material

分類號:

TQ152；TB324

DOI:

10.7502/j.issn.1674-3962.202207006

文獻標志碼:

A

摘要:

共軛微孔聚合物因其交聯(lián)多孔的骨架及高度共軛的結(jié)構(gòu)，在鋰離子電池電極材料領域具有巨大的應用前景。以四嗪作為連接單元，構(gòu)筑了具有氧化還原活性的共軛微孔聚合物TZF和TBFZ，并對該共軛微孔聚合物作為鋰離子電池負極材料的性能進行了測試。結(jié)果表明，由于具有更豐富的活性單元四嗪環(huán)以及更低的最低未占分子軌道能級，TZF展現(xiàn)出比TBFZ更好的電化學性能。此外，在不同的電流密度下循環(huán)后，TZF比容量均有不同程度的提高。當電流密度為0.1C時，循環(huán)250次后比充電容量從62增加到108.6 mAh·g-1；電流密度為1.0C時，循環(huán)1000次后比充電容量從40提高到139 mAh·g-1，并且?guī)靷愋�率始終接近100%，表明TZF作為鋰離子電池負極材料具有良好的氧化還原活性及循環(huán)穩(wěn)定性。

Abstract:

Conjugated microporous polymers exhibit great application prospects in lithium-ion battery electrode materials due to the cross-linked porous skeleton and highly conjugated structure. In this work, redox-active conjugated microporous polymers TZF and TBFZ were prepared by using tetrazine as the linking units, and their performances as anode materials for Li-ion batteries were tested. The results show that TZF exhibits better electrochemical performance than TBFZ owing to the richer active unit tetrazine ring and lower LUMO energy level of TZF. In addition, the specific capacity of TZF is improved in different degrees after cycling at various C-rates. The specific charge capacity increases from 62 to 108.6 mAh·g-1 after 250 cycles at 0.1C, when the charge and discharge rate raises to 1.0C, the capacity increases from 40 up to 139 mAh·g-1 after 1000 cycles, and its coulombic efficiency is always close to 100%, indicating that TZF as an anode material for lithium-ion batteries exhibits good redox activity, good rate performance and cycle stability.