Al掺杂锰酸锂材料在水系锂离子电池中的循环稳定性

doi:10.19799/j.cnki.2095-4239.2021.0080

摘要/Abstract

摘要：

水系锂离子电池具有优良的安全性能和高离子导电性等优点，得到了广泛研究。LiMn₂O₄材料在水系锂离子电池中较差的循环稳定性使其应用受到限制。为了改善这一缺陷，以乙炔黑为模板，采用简单的高温固相法合成了Al掺杂的LiMn₂O₄材料(LiMn_1.9Al_0.1O₄)，并应用于水系锂离子全电池中。实验结果表明，在0.1 A/g的电流密度下，LiMn₂O₄材料放电比容量高达125.5 mA·h/g，略高于LiMn_1.9Al_0.1O₄材料的比容量(121.6 mA·h/g)。在0.1 A/g电流密度下，经200次循环LiMn_1.9Al_0.1O₄材料的容量保持率(90%)高于LiMn₂O₄材料(78%)。将电流密度提升到1 A/g经500次循环后LiMn_1.9Al_0.1O₄和LiMn₂O₄材料的容量保持率分别为88%和57%。上述结果表明Al掺杂的锰酸锂材料在水系锂离子电池中的循环稳定性以及倍率性能均有明显提高，说明Al的掺杂能显著提升锰酸锂正极材料的结构稳定性，并且能够缓解Mn的溶解和抑制Jahn-Teller效应，改善循环性能。

关键词: Al掺杂, LiMn₂O₄, 水系锂离子电池, 循环稳定性

Abstract:

Aqueous Li ion batteries have been extensively studied for their safety and high ionic conductivity. As an important cathode material, LiMn₂O₄ is limited because of its poor cyclic stability in aqueous Li ion batteries. Al-doped LiMn₂O₄ cathode materials were synthesized by a simple high-temperature solid phase method, using acetylene black as the template, and applied to aqueous Li ion batteries. The discharge specific capacity of LiMn₂O₄ (125.5 mA·h·g^-1) at 0.1A·g^-1 is slightly higher than that of LiMn_1.9Al_0.1O₄(121.6 mA·h·g^-1). The capacity retention of LiMn_1.9Al_0.1O₄ cathode materials at 0.1 A·g^-1 is 90% after 200 cycles, which is higher than that of LiMn₂O₄ (78%). At a high current density of 1 A·g^-1, the LiMn_1.9Al_0.1O₄ sample displays 88% capacity retention after 500 cycles, which is considerably higher than the LiMn₂O₄ sample (57%). These results confirm that Al-doped LiMn₂O₄ cathodes can alleviate the dissolution of Mn, inhibit the Jahn-Teller effect, and improve the cycling performance.

Key words: Al-doping, LiMn₂O₄, aqueous lithium-ion battery, cycling stability

中图分类号:

TM 911

Al-jawfi Ibrahim, 赵佳琦, 师萌, 康晓红. Al掺杂锰酸锂材料在水系锂离子电池中的循环稳定性[J]. 储能科学与技术, 2021, 10(4): 1330-1337.

Al-jawfi IBRAHIM, Jiaqi ZHAO, Meng SHI, Xiaohong KANG. High electrochemical stability of Al-doped spinel LiMn₂O₄cathode material for aqueous lithium-ion batteries[J]. Energy Storage Science and Technology, 2021, 10(4): 1330-1337.

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Sample	a=b=c /nm	α=β=γ /(°)	Space group	Cell volume
LMO	0.824158	90	Fd-3m	559.798
LMAO	0.823329	90	Fd-3m	558.110

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