Influence of heated calendering process on cathode film performance of lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2023.0946

Abstract

Abstract:

The cathode film for lithium-ion batteries is fabricated using lithium iron phosphate powder on a production line. During the calendering process, the roll temperature is set to 25 ℃, 60 ℃, 80 ℃, 100 ℃, and 120 ℃, respectively, and the cathode film is rolled to a uniform thickness under consistent roll pressure. Subsequently, the cathode film is fashioned intoCR2032 button batteries for evaluation. Parameters such as thickness uniformity, film resistance, peeling force, thickness rebound, elongation, and scanning electron microscopy (SEM) analyses are assessed. Additionally, electrochemical impedance spectroscopy (EIS), 0.1—2C rate performance, and short-term 1C cycle performance are characterized to ascertain the impact of heated calendering on cathode film and cell performance, and to identify the optimal calendering temperature. Findings indicate that heated calendering does not affect the elongation of the cathode film; however, it enhances the uniformity of film thickness. The process also diminishes the resistance of the cathode film, with the optimal reduction observed at 100 ℃, approximately 2.1%. Moreover, heated calendering reduces thickness rebound, with the lowest rates at 60 ℃ and 100 ℃, approximately half of that at 25 ℃. The peeling force initially increases and then decreases with roll temperature, peaking near 60 ℃. SEM images reveal tighter binding of active materials postheated calendering compared to normal temperature processes, without grain breakage. Heated calendering effectively lowers both ohmic and charge-transfer impedance, with optimal results at around 100 ℃, correlating with film resistance observations. Enhanced rate performance is also noted in cathode films subjected to heated calendering, particularly at 100 ℃. However, no significant differences are observed in the cycle performance data over 100 cycles between cathode films produced via heated and normal calendering. Overall, heated calendering positively influences both film and cell performance, with the most beneficial effects at approximately 100 ℃.

Key words: lithium ion batteries, heated calendering, lithium iron phosphate, process window

CLC Number:

TQ 152

Zhaocai LYU, Yuxi WANG, Zhitao WANG, Xiaohui SUN, Jingkang LI. Influence of heated calendering process on cathode film performance of lithium-ion batteries[J]. Energy Storage Science and Technology, 2024, 13(5): 1443-1450.

Figures/Tables 12

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References 11

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温度/℃	R_s/Ω	R_ct/Ω
25	3.696	208.400
60	2.331	183.300
80	2.353	141.900
100	2.210	132.600
120	2.173	135.900

温度/℃	不同电流下的容量/(mAh/g)				容量保持率/%
温度/℃	0.1C	0.5C	1C	2C	0.5C/0.1C	1C/0.1C	2C/0.1C
25	154	145.2	137.9	130.4	94.3	89.5	84.7
60	155	147.6	142.3	135.1	95.2	91.8	87.2
80	154	147.2	142.5	133.7	95.6	92.5	86.8
100	157.5	150.5	145.5	137.6	95.6	92.4	87.4
120	153.8	147.2	142.2	135.4	95.7	92.5	88.0

性能	不同温度下的评分
性能	25 ℃	60 ℃	80 ℃	100 ℃	120 ℃
剥离力	4	5	4	4	3
膜片电阻	2	3	2	5	4
厚度一致性	5	4	3	4	2
横向延展率	5	5	5	5	5
纵向延展率	5	5	5	5	5
厚度反弹率	1	5	3	4	2
欧姆阻抗	3	4	4	5	5
电荷传递阻抗	2	3	4	5	5
放电比容量	3	4	4	5	4
倍率容量保持率	1	3	2	4	5

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