三(2-羧乙基)膦阻隔层对锂硫电池穿梭效应的抑制

doi:10.7503/cjcu20190258

摘要/Abstract

摘要：

为了抑制热力学穿梭效应, 改善锂硫电池的电化学性能. 将三(2-羧乙基)膦芳纶纸中间层(TCEP-AP)嵌在锂硫电池正极和隔膜之间. 通过透射电子显微镜(TEM)、扫描电子显微镜(SEM)、红外光谱和元素能谱分析(EDS)等对材料进行结构和性能表征. 电化学实验表明, TCEP是一种特别有效的多硫化物剪切剂, 在0.1C倍率时, S-TCEP-AP 锂硫电池的初始放电容量达到1544 mA·h·g ^-1. 在1C倍率下循环400次后, 比放电容量仍维持在609 mA·h·g ^-1, 衰减率极低(每周衰减0.029%), 展现出良好的倍率和循环性能.

关键词: 锂硫电池, 氧化还原反应, 亲磷酯, 中间层, 穿梭效应, 多硫化锂

Abstract:

In order to prevent the thermodynamics shuttle effect, improve the electrochemical performance of lithium sulfur batteries, the tris(2-carboxyethyl)phosphine-aramid paper(TCEP-AP) interlayer was sandwiched between cathode and separator. The morphology and structure of materials were observed by transmission electron microscopy(TEM), scanning electron microscopy(SEM), infrared spectroscopy and energy dispersive spectroscopy(EDS). Electrochemical tests show that TCEP can be an especially effective agent to cut polysulfides, and the initial discharge capacity reached 1544 mA·h·g ^-1 for S-TCEP-AP Li-S battery at 0.1C. The S-TCEP-AP Li-S battery specific discharge capacity remains at 609 mA·h·g ^-1, and a negligible fading rate of 0.029% per cycle at 1C was obtained after 400 cycles. The S-TCEP-AP Li-S battery shows good multipliability and cyclic performance.

Key words: Lithium-sulfur battery, Redox reaction, Phosphophilic ester, Interlayer, Shuttle effect, Lithium polysulfides

中图分类号:

O646
TM912.9

TrendMD:

黄雅盼, 孙晓刚, 李锐, 梁国东, 魏成成, 胡浩. 三(2-羧乙基)膦阻隔层对锂硫电池穿梭效应的抑制. 高等学校化学学报, 2019, 40(11): 2375.

HUANG Yapan, SUN Xiaogang, LI Rui, LIANG Guodong, WEI Chengcheng, HU Hao. Suppression of Shuttle Effect of Lithium-sulfur Batteries by Tris(2-carboxyethyl)phosphine Interlayer ^†. Chem. J. Chinese Universities, 2019, 40(11): 2375.

图/表 10

Fig.1 Structures of S-TCEP-AP(Ⅰ) and S-NONE(Ⅱ) lithium-sulfur batteries and mechanism of reduction of disulfides by TCEP(Ⅲ)

Fig.2 SEM(A) and TEM(B) images of the MWCNTs

Fig.3 SEM images of the aramid paper (A) Surface image; (B) cross-section image.

Fig.4 SEM image(A), element mapping of P(B) and O(C) and EDS(D) of TCEP-AP

Fig.5 SEM image of the cathode

Fig.6 Pore size distribution of MWCNTs(A), infrared spectra of TCEP-AP and AP(B) and cyclic curves of lithium-sulfur battery(C)

Fig.7 The first cycle charge/discharge curves at 0.1C, 0.2C, 0.5C, 1C, 2C of S-AP(A), S-TCEP-AP(B) lithium-sulfur batteries, the first cycle charge/discharge curves at 0.1C(C) and rate capability(D) of different lithium-sulfur batteries

Fig.8 Long cycling performance of S-TCEP-AP lithium-sulfur battery at 1C for 400 cycles

Fig.9 Comparison of EIS before(A) and after 60 cycles(B) charge-discharge test

Fig.10 SEM images of cathodes of S-NONE(A), S-AP(B) and S-TCEP-AP(C) after 50 cycles and SEM(D) and element mapping(insets) images of TCEP-AP after 50 cycles

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