B/Al/Zr协同策略改善高镍单晶正极材料高温稳定性

doi:10.19964/j.issn.1006-4990.2023-0122

Abstract

Abstract:

In order to meet the demand of high energy density lithium-ion Battery（LIBs） in recent years，single crystal high nickel LiNi_0.89Co_0.06Mn_0.05O₂（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 Ni_0.89Co_0.06Mn_0.05（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.

Key words: lithium-ion battery, high nickel cathode, B/Al/Zr synergistic strategy, high energy density

CLC Number:

TG113

FENG Zhun. Improvement of high temperature stability of high nickel single crystal cathode materials by B/Al/Zr synergistic strategy[J]. Inorganic Chemicals Industry, 2023, 55(8): 59-64.

Figures/Tables 10

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References 16

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样品	a/Å	c/Å	c/a值	V/Å³	Li⁺/Ni²⁺ 混排度/%
NCM89	2.87	14.26	4.96	102.5	4.98
0.2%B/Al/Zr@NCM89	2.87	14.25	4.96	102.5	4.64
0.4%B/Al/Zr@NCM89	2.87	14.26	4.96	102.5	4.32
0.6%B/Al/Zr@NCM89	2.87	14.27	4.96	102.4	4.57

样品	元素质量分数/%
样品	Ni	Co	Mn	Al	Zr	B
NCM89	0.535 9	0.036 2	0.028 1	0	0	0
0.2%B/Al/ Zr@NCM89	0.534 5	0.036 1	0.028 0	0.195 6	0.192 3	0.182 6
0.4%B/Al/ Zr@NCM89	0.533 2	0.036 0	0.027 5	0.387 7	0.389 6	0.376 5
0.6%B/Al/ Zr@NCM89	0.531 8	0.035 8	0.027 0	0.587 9	0.582 7	0.568 0

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Improvement of high temperature stability of high nickel single crystal cathode materials by B/Al/Zr synergistic strategy

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