锰基钠离子电池正极材料设计及电化学性能研究

doi:10.19964/j.issn.1006-4990.2023-0247

Abstract

Abstract:

Sodium ion batteries have become the successor of lithium ion batteries due to their advantages of environmental friendliness and abundant reserves，and have great application potential in energy storage materials.In view of the problems of unstable structure and poor cycle stability of manganese-based cathode materials for sodium ion batteries，Na_0.7Fe _x Mn_（1-_x_）O₂（0<x<1） manganese-based cathode materials were prepared by sol-gel method.The effects of n（Fe）/n（Mn） molar ratio on the microstructure and electrochemical properties of Na_0.7Fe _x Mn_（1-_x_）O₂ materials were investigated.The results showed that the doping of iron stabilized the P2 phase crystal form of the material and increased the sodium layer spacing.The P2-phase layered cathode materials of Na_0.7Fe_0.2Mn_0.8O₂ and Na_0.7Fe_0.35Mn_0.65O₂were synthesized.The synthesized two materials of Na_0.7Fe_0.2Mn_0.8O₂and Na_0.7Fe_0.35Mn_0.65O₂ had charge/discharge specific capacities of 88.54，63.73 mA·h/g and 74.02，49.01 mA·h/g in the first cycle.After 100 cycles，the charge/discharge specific capacities were 51.94，51.36 mA·h/g and 52.15，51.59 mA·h/g，respectively，and the cycle efficiencies were 58.01% and 69.7%，respectively，showing good capacity retention and cycle performance.In terms of rate，the charge and discharge specific capacity of the two materials could still reach 113.82，110.25 mA·h/g and 51.75，51.11 mA·h/g when the two materials were charged at 2C high current and recycled to 0.5C rate.Both materials showed good cycle rate performance.In general，the performance of Na_0.7Fe_0.2Mn_0.8O₂ was more excellent.

Key words: manganese-based, cathode material, iron-doped, P2 phase, specific capacity

CLC Number:

TQ137.12

LIU Dexin, MA Tengyue, AN Jinling, LIU Jinrong, HE Weiyan. Study on cathode material design and electrochemical properties of manganese-based sodium ion battery[J]. Inorganic Chemicals Industry, 2024, 56(3): 51-55.

Figures/Tables 6

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Table 1

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References 19

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样品	a/Å	b/Å	c/Å	V/Å³
Na_0.7MnO_2.05	2.876	2.876	11.12	79.70
Na_0.7Fe_0.2Mn_0.8O₂	2.884	2.883	11.14	80.21
Na_0.7Fe_0.35Mn_0.65O₂	2.871	2.871	11.17	79.76

材料名称	元素	质量分数/%	相对原子质量	物质的量比	归一化
Na_0.7Fe_0.2Mn_0.8O₂	Na	31.47	22.99	1.37	1.23
	Fe	13.82	55.85	0.25	0.22
	Mn	47.56	54.94	0.87	0.78
Na_0.7Fe_0.35Mn_0.65O₂	Na	26.28	22.99	1.14	0.90
	Fe	25.75	55.85	0.46	0.36
	Mn	44.11	22.99	0.80	0.64

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Study on cathode material design and electrochemical properties of manganese-based sodium ion battery

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