Huang Tao, Pan Ying, Yan Chunfeng, Wu Maoxiang
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
ACS Appl Mater Interfaces. 2021 Oct 20;13(41):48881-48888. doi: 10.1021/acsami.1c15137. Epub 2021 Oct 5.
In this work, we propose that 1,1,3,3-tetramethyldisiloxane (TMDS) is beneficial for electrochemical property enhancement of LiNiMnO/Li cells at high temperatures. The LiNiMnO/Li cells with 1 vol % TMDS revealed capacity retention of 81.2% after a cycling test at 55 °C, while the cells without additive showed capacity retention of only 32.3%. The cells with 1 vol % TMDS also presented a better rate performance, reaching 100 mAh g under 3C. Physical characterization and theoretical calculations revealed that TMDS formed a thinner and better conductive layer on the LiNiMnO surface and effectively scavenged HF/F from the electrolyte, contributing to high stabilization of LiNiMnO.
在本工作中，我们提出1,1,3,3-四甲基二硅氧烷（TMDS）有利于提高LiNiMnO/Li电池在高温下的电化学性能。含1体积% TMDS的LiNiMnO/Li电池在55℃循环测试后容量保持率为81.2%，而不含添加剂的电池容量保持率仅为32.3%。含1体积% TMDS的电池也表现出更好的倍率性能，在3C下达到100 mAh g 。物理表征和理论计算表明，TMDS在LiNiMnO表面形成了更薄且导电性更好的层，并有效地从电解质中清除了HF/F，有助于LiNiMnO的高度稳定。
