Bicomponent electrolyte additive excelling fluoroethylene carbonate for high performance Si-based anodes and lithiated Si-S batteries
Bicomponent electrolyte additive excelling fluoroethylene carbonate for high performance Si-based anodes and lithiated Si-S batteries
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用于高性能硅基阳极和锂化硅硫电池的双组分电解质添加剂，性能优于氟代碳酸亚乙酯
DOI：
10.1016/j.ensm.2018.11.001
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发表时间：
2019-07
影响因子：
20.4
通讯作者：
Jiulin Wang
中科院分区：
文献类型：
--
作者：
Zhixin Xu;Jun Yang;Ji Qian;Tao Zhang;Yanna Nul;Renjie Chen;Jiulin Wang
近年来，用于高能锂离子电池和锂硫电池的硅基负极材料作为“超锂离子电池”的候选材料得到了广泛的研究。FEC电解液添加剂对改善硅基电极的循环稳定性有重要作用，但其高温性能仍不理想。本文提出了一种新的双组分添加剂（LiPO 2F 2 + DMTFA）来代替LiPF 6/碳酸盐电解液中的FEC。所得电解质显示出高的离子电导率（10.9mS cm-1）、良好的抗氧化能力（> 5Vvs.Li/Li+）以及即使在升高的温度下也与Si基阳极优异的相容性。该电解液也适用于锂硫电池的S@pPAN正极。含有该电解质的原位锂化Si-S@pPAN电池在1 C下提供约1400 mA h g-1硫的高可逆容量，1000次循环的容量保持率为92.1%，在2 C下提供约1350 mA h g-1硫的高可逆容量，2000次循环的容量保持率为94.8%。其速率性能也得到了很大的改善。这种电池系统避免了传统Li-S电池的一些致命缺陷，包括Li枝晶的形成和热不稳定性。该方法具有良好的实际应用前景。
Si-based anode materials for advanced high energy Li-ion batteries and Li-S battery as a promising candidate for “beyond LIBs” have been intensively studied in recent years. Although FEC electrolyte additive plays an important role in improving the cycle stability of Si-based electrodes, its high temperature behavior is still unsatisfactory. Herein, a new bicomponent additive (LiPO2F2+ DMTFA) is proposed to replace FEC in LiPF6/carbonate electrolyte. The resulting electrolyte shows high ionic conductivity (10.9 mS cm-1), good anti-oxidation capability (>5 Vvs.Li/Li+) and excellent compatibility with Si-based anodes even at elevated temperature. Moreover, this electrolyte is also fit for S@pPAN cathode developed for Li-S batteries. An in-situ lithiated Si-S@pPAN cell containing the proposed electrolyte delivers a high reversible capacity of about 1400 mA h g-1sulfurwith retention of 92.1% for 1000 cycles at 1 C and about 1350 mA h g-1sulfurwith a capacity retention of 94.8% for 2000 cycles at 2 C. Its rate performance has been also improved greatly. This cell system avoids some fatal flaws of conventional Li-S cells, including the Li dendrite formation and thermal instability. It is promising for the practical application.
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影响因子：
10.8
作者：
Yang, Yuan;McDowell, Matthew T.;Cui, Yi
通讯作者：
Cui, Yi
新型锂硅硫电池利用优化的类固体电解质来提高安全性和循环寿命
影响因子：
13.3
作者：
Zhou Dong;Liu Ming;Yun Qinbai;Wang Xia;He Yan-Bing;Li Baohua;Yang Quan-Hong;Cai Qiang;Kang Feiyu
通讯作者：
Kang Feiyu
影响因子：
9.2
作者：
A. Xiao;Wentao Li;B. Lucht
通讯作者：
A. Xiao;Wentao Li;B. Lucht
影响因子：
6.6
作者：
Kim, Koeun;Park, Inbok;Choi, Nam-Soon
通讯作者：
Choi, Nam-Soon
影响因子：
5.4
作者：
Park, Joonam;Jeong, Jiseon;Lee, Yong Min
通讯作者：
Lee, Yong Min