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LiNi0.5Mn1.5O4(LNMO)作为下一代高比能锂离子电池正极材料的重要候选，其应用仍面临高工作电压(4.7V)下电解液易分解等问题。本研究旨在通过电解液添加剂调控，改善LNMO/Li电池高电压电化学性能，具体是在传统碳酸酯类电解液中添加三(2-氰乙基)硼酸酯(TCEB)作为成膜添加剂。研究发现，TCEB借助其硼-氧键(—B—O—)和丁腈基团(—C≡N)的协同作用，能够在LNMO正极表面优先氧化形成均匀稳定的正极界面膜，有效抑制电解液的持续分解并维持电极结构完整。电化学测试显示，添加0.25%TCEB后，LNMO/Li电池在1C倍率下循环100次的容量保持率从85.40%提升至97.23%，展现出优异的循环稳定性。
Abstract：LiNi0.5Mn1.5O4(LNMO)is a promising cathode material for next-generation high-energy-density lithium-ion batteries,yet its practical application is hindered by severe electrolyte decomposition under high operating voltage(4.7V).This study aims to enhance the electrochemical performance of LNMO/Li cells under high voltage by introducing tris(2-cyanoethyl)borate(TCEB)as a film-forming additive into conventional carbonate-based electrolytes.It is found that,owing to the synergistic effect of the boronoxygen bonds(—B—O—)and nitrile groups(—C≡N),TCEB undergoes preferential oxidation on the LNMO cathode surface,forming a uniform and stable cathode electrolyte interphase(CEI)film.This effectively suppresses continuous electrolyte decomposition and helps maintain the structural integrity of the electrode.Electrochemical tests demonstrate that with the addition of 0.25% TCEB,the LNMO/Li cell exhibits a significantly improved capacity retention of 97.23%after 100 cycles at 1C,compared to 85.40% without the additive,highlighting its superior cycling stability.
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基本信息:
DOI：10.16191/j.cnki.hbkx.2025.05.009
中图分类号:TM912
引用信息:
[1]穆金萍,畅海超,王静月,等.三（2-氰乙基）硼酸酯对LiNi_(0.5)Mn_(1.5)O_4/Li电池性能的影响[J].河北省科学院学报,2025,42(05):34-38.DOI:10.16191/j.cnki.hbkx.2025.05.009.
基金信息:
