B/Al/Zr协同策略改善高镍单晶正极材料高温稳定性
收稿日期: 2023-03-09
网络出版日期: 2023-08-25
Improvement of high temperature stability of high nickel single crystal cathode materials by B/Al/Zr synergistic strategy
Received date: 2023-03-09
Online published: 2023-08-25
近年来，为了满足高能量密度锂离子电池（LIBs）的需求，单晶高镍LiNi0.89Co0.06Mn0.05O2（NCM89）正极材料因其比容量高、成本低而受到越来越多的关注。然而，NCM89表面锂残留过多、高温循环性能不理想及热稳定性差限制了其进一步的商业化应用。为了解决NCM89正极在长循环过程中材料结构坍塌和电池容量损失的问题，提出了一种利用B/Al/Zr协同策略来改善NCM89电化学性能的方法，即将锂源、铝源、硼源和锆源充分混合后同前驱体Ni0.89Co0.06Mn0.05（OH）2煅烧，合成B/Al/Zr掺杂的NCM89正极材料。结果表明，B/Al/Zr协同的NCM89正极材料具有良好的循环稳定性，其中0.4%B/Al/Zr@NCM89正极在200次循环后放电比容量为131.6 mA·h/g，远高于原始NCM89（99.1 mA·h/g，容量保持率为45%）。体相中均匀掺杂的B/Al/Zr能有效减少锂残留、改善界面锂离子的传输，抑制界面副反应的发生。该工作为改善高镍材料的界面稳定性、提高电化学性能提供新的见解，从而促进高能量密度锂离子电池的商业化应用。
关键词： 锂离子电池; 高镍正极; B/Al/Zr协同策略; 高能量密度
冯准 . B/Al/Zr协同策略改善高镍单晶正极材料高温稳定性[J]. 无机盐工业, 2023 , 55(8) : 59 -64 . DOI: 10.19964/j.issn.1006-4990.2023-0122
In order to meet the demand of high energy density lithium-ion Battery（LIBs） in recent years，single crystal high nickel LiNi0.89Co0.06Mn0.05O2（NCM89） cathode materials have attracted more and more attention due to their high specific capacity and low cost.However，excessive residual lithium on the surface of NCM89，unsatisfactory high-temperature cycling performance and poor thermal stability limit their further commercial use.In order to solve the material collapse and the corresponding capacity loss of NCM89 cathode during the long cycle process，an effective strategy to improve the electrochemical performance of NCM89 using B/Al/Zr synergistic strategy was proposed.B/Al/Zr doped NCM89 cathode materials were synthesized by calcining the precursor Ni0.89Co0.06Mn0.05（OH）2 after full mixing of lithium，aluminum，boron and zirconium sources.The results showed that the cathode electrode of the B/Al/Zr cooperative NCM89 had good cyclic stability.The specific discharge capacity of 0.4%B/Al/Zr@NCM89 cathode was 131.6 mA·h/g after 200 cycles，which was significantly higher than the original NCM89（99.1 mA·h/g，with a capacity retention rate of 45%）.Homogeneous doping of B/Al/Zr in the bulk phase could effectively reduce the lithium residue，improve the interfacial lithium ion transport，and inhibit the side reactions at the interface.This work provided new insights for improving the interfacial stability and electrochemical performance of high Ni materials，thus promoting the commercial application of high energy density lithium ion batteries.
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