Study on aging characteristics and failure mechanism of lithium-ion battery under slight-overcharge cycling

doi:10.19799/j.cnki.2095-4239.2024.0256

Abstract

Abstract:

In practice, lithium-ion batteries may experience slight overcharging as a result of pack inconsistency or charging system malfunction. Long-term overcharge cycling can lead to safety hazards. To investigate the effects of slight-overcharge cycling on the aging characteristics and failure mechanisms of lithium-ion batteries, the batteries were subjected to different cut-off voltages of overcharging. The aging analysis was carried out by using electrochemical impedance spectroscopy (EIS), distribution of relaxation time (DRT), and incremental capacity analysis (ICA). The effectiveness of these techniques was validated through the integration of the scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) characterization of the disassembled electrodes. The experimental results show that slight-overcharge cycling significantly accelerates battery aging when compared to normal cycling, and leading to a faster rate of specific capacity decay. Additionally, as the number of cycles increases, the depletion of lithium ions and active materials within the battery is expedited, leading to a noticeable increase in various types of battery impedance. Notably, the charge transfer resistance of batteries cycled at 4.5 V slight-overcharge increased by 196.15% from the initial state. Slight-overcharge cycling also results in increased battery polarization and deteriorates cycling stability of the materials. Following slight-overcharge cycling, active materials were observed to detach from the current collectors, with significant fracturing of active particles in the cathode material and thickening of the solid electrolyte interface (SEI) film on the anode material, alongside a notable increase in the contents of F and P elements.

Key words: Lithium-ion battery, slight-overcharge cycling, electrochemical impedance spectroscopy, aging characteristics, failure mechanism

CLC Number:

TM 912

Yueming MIN, Chuang ZHANG, Wenjie LIU, Suzhen LIU, Zhicheng XU. Study on aging characteristics and failure mechanism of lithium-ion battery under slight-overcharge cycling[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2024.0256.

Figures/Tables 17

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电池编号	充电容量/mAh	放电容量/mAh	充放电效率/%	内阻/mΩ
1	2494.4	2480.7	99.45	37.93
2	2492.4	2479.7	99.49	37.81
3	2491.0	2479.5	99.54	38.24
4	2485.4	2472.7	99.49	38.52

元素	原子百分比（At%）				重量百分比（Wt%）
元素	原始	4.3V	4.4V	4.5V	原始	4.3V	4.4V	4.5V
C	45.3	43.8	43.7	44.3	25.20	23.93	22.84	25.32
O	27.7	28.5	27.5	24.4	20.51	20.76	20.57	18.57
F	9.6	9.6	11.4	15.5	8.40	8.34	9.96	13.99
P	0.5	0.4	0.5	1	0.67	0.50	0.83	1.41
Ni	8.3	8.7	8.2	7.2	22.49	23.26	23.03	20.21
Co	3.3	3.4	3.3	2.9	9.04	9.07	8.85	8.25
Mn	5.4	5.7	5.5	4.7	13.69	14.15	13.91	12.26

元素	原子百分比（At%）				重量百分比（Wt%）
元素	原始	4.3V	4.4V	4.5V	原始	4.3V	4.4V	4.5V
C	87.8	38.3	35.7	40.6	83.65	29.95	28.06	31.93
O	10.0	44.6	48.9	40.7	12.75	46.47	51.04	42.64
F	1.9	14.1	13.2	16.1	2.80	17.47	16.39	20.02
P	0.3	2.8	2.2	2.6	0.81	5.66	4.50	5.20
S	0.0	0.0	0.0	0.1	0.00	0.00	0.00	0.21
Ni	0.0	0.1	0.0	0.0	0.00	0.46	0.00	0.00

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