首页|腈基功能化有机硅氧烷成膜添加剂的合成及其在NCM811/Li电池中的应用

腈基功能化有机硅氧烷成膜添加剂的合成及其在NCM811/Li电池中的应用

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设计合成了一种腈基功能化有机硅氧烷化合物2-甲基-4-(1,1,3,3,3-五甲基二硅氧烷)丁腈(DSMCN),研究其作为电解液添加剂在高能量密度高镍三元 NCM811 电池中的电化学性能.利用线性扫描伏安法(LSV)测试了DSMCN的氧化电位,考察了DSMCN添加剂对富镍三元NCM811 电池的循环、倍率和高温等条件下的电化学性能.在25℃下,NCM811/Li电池在1 C倍率下循环200 圈后,容量保持率由基础电解液的80.93%提升至94.89%;在 55℃的高温下,容量保持率从 59.52%提升至 88.09%.电化学阻抗谱(EIS)、扫描电子显微镜(SEM)和X射线衍射(XRD)等测试发现,DSMCN 化合物能够在 NCM811 电极表面参与形成更稳定、均匀致密的正极电解质界面膜,展现出更优的电化学动力学特征,降低了界面阻抗,有利于常/高温下电极/电解液界面的 Li+扩散和电荷转移,从而提高了NCM811 电池的电化学性能.
Synthesis of Nitrile-Functionalized Organosiloxane as Film-Forming Additive for NCM811 Lithium-Ion Batteries
A nitrile-containing organodisiloxane compound 2-methyl-4-(1,1,3,3,3-pentamethyldisiloxane)butanenitrile(DSMCN)was designed and synthesized as an efficient electrolyte additive for improving the electrochemical performance of high energy density NCM811 batteries.The oxidation potential of the compound was tested using linear scanning voltammetry(LSV),and the electrochemical performances of NCM811 cells with DSMCN additive,including the cycling,rate and high-temperature performance were investigated and compared with those with the base electrolytes without DSMCN.The results demonstrated that the capacity retention of NCM811/Li half cells at room temperature was improved from 80.93%of the base electrolyte to 94.89%after 200 cycles at 1 C,while the capacity retention at a high temperature of 55℃was increased from 59.52%to 88.09%.Electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM),and X-ray diffraction(XRD)tests revealed that DSMCN participates in forming a more stable,uniform,and dense cathode electrolyte interphase layer on the NCM811 electrode surface,which leads to improved electrochemical kinetics,reduced interfacial impedance,and enhanced Li+diffusion and charge transfer at the electrode/electrolyte interface under both normal and high-temperature conditions,thereby improving the electrochemical performance of NCM811 batteries.

organosiliconnitrileelectrolyte addictivehigh-nickel NCM811 cathode

孙鸳鸳、吴海莹、骆萱、陈程、闫晓丹、郭佳丽、张灵志

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中国科学院广州能源研究所,广州 510640

中国科学技术大学,合肥 230026

中国科学技术大学 纳米科学技术学院,江苏 苏州 215123

广东省新能源和可再生能源研究开发与应用重点实验室,广州 510640

东莞ATL新能源科技有限公司,广东 东莞 523808

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有机硅 电解液添加剂 高镍NCM811正极

中国科学院科技服务网络计划(STS)东莞专项东莞市重点领域研发项目

2021160020033120221200300112

2024

新能源进展

新能源进展

CSTPCD北大核心
影响因子:0.796
ISSN:
年,卷(期):2024.12(4)
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