煅烧对空气电极的多孔结构和电化学性能的影响

doi:10.19964/j.issn.1006-4990.2023-0482

Abstract

Abstract:

The optimization of the pore structure for the air electrode plays a crucial role in enhancing electrochemical performance of the electrode.The oxygen transmission rate can be enhanced，leading to achieve high energy density and long discharge life of metal air batteries by the recombination of the porous electrode structure.In the forming process of air electrode，the effects of calcination temperatures（200，250，300，350，400 ℃） on the apparent morphology，micropore structure，and electrochemical performance of the air electrode were investigated using scanning electron microscopy，differential thermal analysis，specific surface area measurement，wetting angle determination，and electrochemical testing.Additionally，the discharge performance of the Mg-based air battery was further evaluated.The results showed that the fiber melting state of PTFE binder in air electrode changed the distribution of micropore structure（including air inlet and liquid inlet） via the increase of heat treatment temperature，which affected the oxygen reduction electrochemical performance and the discharge life of air electrode.In particular，the air electrode prepared at a calcination temperature of 350 ℃，which was close to the PTFE phase transition point（343 ℃），exhibited the uniform pore size distribution and the optimal hydrophobic characteristics（including hydrophobic points and gas diffusion channels）.As a result，the air electrode demonstrated the minimum electrode polarization（with an electrode current density of 159.1 mA/cm² at a polarization potential of -0.45 V），the longest discharge lifespan（with a discharge time of 39.0 h at a current density of 15 mA/cm²），as well as high capacity and power density（37.4 A·h and 13.05 mW/cm²，respectively）.

Key words: air electrode, calcination temperature, electrochemical property, metal air battery

CLC Number:

TQ138.13

LIU Hui, WANG Hongliang, YU Kun, GAO Shengnan. Effect of calcination on porous structure and electrochemical properties of air electrode[J]. Inorganic Chemicals Industry, 2024, 56(6): 80-86.

Figures/Tables 11

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References 16

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样品	比表面积/ （m²·g^-1）	平均孔径/ nm	孔体积/ （cm³·g^-1）
AR-200	100.86	45.11	0.66
AR-250	98.75	42.36	0.64
AR-300	84.25	39.95	0.59
AR-350	90.81	37.92	0.64
AR-400	64.21	20.78	0.48

煅烧温度/℃	催化层/s				防水透气层/s
煅烧温度/℃	C-1	C-2	C-3	C-4	F-1	F-2	F-3	F-4
200	89	90	96	99	183	185	192	198
250	94	94	99	102	186	195	201	206
300	110	112	110	112	208	210	206	211
350	89	91	93	95	179	172	187	190
400	122	126	124	128	220	225	231	228

煅烧温度/℃	平均电压/V	寿命/ h	容量/ （A·h）	功率密度/ （mW·cm^-2）
200	0.85	12.5	12.00	12.75
250	0.82	21.3	20.50	12.30
300	0.80	35.4	34.00	12.00
350	0.87	39.0	37.40	13.05
400	0.67	17.9	17.18	10.05

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Effect of calcination on porous structure and electrochemical properties of air electrode

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