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双层(或多层)涂布是工业中进行极片孔隙调控及提升快充性能的主要手段之一。本设计采用上、下两层不同孔隙率或面密度组合的负极片进行对称扣式电池离子阻抗(Rion)和全电池d Q/d V曲线分析，并结合仿真建模，探究不同组合下快充性能的差异。在负极片上、下两层面密度相等且总压实密度不变的条件下，上层比下层大4%的孔隙率组合比相反孔隙率组合的Rion降低44%，等效快充倍率提升8.5%。在本设计中，良好的快充性能需要下层孔隙率不低于22%；在孔隙率上层比下层大4%时，相较于上、下层面密度比为35∶65的负极，面密度比为65∶35的负极Rion降低了8.2%，且析锂峰明显减弱。上层孔隙率从20%增大到65%时，锂离子浓度差从270.73 mol/m3逐渐减小至255.51mol/m3，上层孔隙率从65%继续增大时，锂离子浓度差不再持续减小。
Abstract：Dual(multi)-layer coating is one key industrial method for electrode porosity control and fast-charging performance enhancement. For the negative electrode, upper/lower layers with different porosities and areal densities were investigated. Differences in fast-charging performance were explored by Rion, d Q/d V and simulation. In condition of equal layer areal density and constant total compaction density, 4% higher upper-layer porosity reduced Rion by 44% and boosted equivalent fastcharging C-rate by 8.5% vs. the C-rate of the inverted combination. Optimal fast-charging performance requires a lower-layer porosity no less than 22%. With upper-layer porosity 4% higher than lower, the negative electrode with upper to lower layer surface density of 65∶35 shows the 8.2% reduction in Rion and significantly weaker lithium plating peak vs. the 35∶65 one. As the upper layer porosity increased from 20% to 65%, the lithium-ion concentration difference decreased from 270.73 mol/m3 to 255.51 mol/m3, no further reduction above 65%.
[1]Weng J W,Jossen A,Stefanopoulou A,et al. Fastcharging lithium-ion batteries require a systems engineering approach[J].Nature Energy,2025,10(11):1289-1290.
[2]Zheng M T,Zhu X X,Zheng H F,et al. Deployment strategies for Li-rich cathode materials in batteries[J].Nature Energy,2025,10(7):789-792.
[3]曾祥兵，朱红，宋开通，等．长续航纯电动车发展趋势及对动力电池系统需求的变化[J]．时代汽车，2018(7):89-90.
[4]Thompson L M,Harlow J E,Dahn J R.Increasing stack energy density without lifetime penalty by increasing electrode loading in single crystal Li[Ni0.5Mn0.3Co0.2] O2/graphite pouch cells[J].Journal of the Electrochemical Society,2021,168(10):100545.
[5]Landesfeind J,Hattendorff J,Ehrl A,et al. Tortuosity determination of battery electrodes and separators by impedance spectroscopy[J]. Journal of the Electrochemical Society,2016,163(7):A1373-A1387.
[6]Fuller T F,Doyle M,Newman J.Simulation and optimization of the dual lithium ion insertion cell[J].Journal of the Electrochemical Society,1994,141(1):1-10.
[7]王瑞梓，刘训良，豆瑞锋，等．三元软包锂离子电池放电过程扩散诱导应力与热应力对比研究[J]．储能科学与技术，2024,13(4):1128-1141.
[8]Lu L L,Lu Y Y,Zhu Z X,et al. Extremely fastcharging lithium-ion battery enabled by dual-gradient structure design[J]. Science Advances,2022,8(17):eabm6624.
[9]Wood M,Li J L,Du Z J,et al.Impact of secondary particle size and two-layer architectures on the high-rate performance of thick electrodes in lithium-ion battery pouch cells[J].Journal of Power Sources,2021,515:230429.
[10]Zhang X,Hui Z Y,King S T,et al. Gradient architecture design in scalable porous battery electrodes[J].Nano Letters,2022,22(6):2521-2528.
[11]Shodiev A,Chouchane M,Gaberscek M,et al.Deconvoluting the benefits of porosity distribution in layered electrodes on the electrochemical performance of Li-ion batteries[J].Energy Storage Materials,2022,47:462-471.
[12]Niu X Y,Lu Y Y,Chen P C,et al. Gradient-matched microstructural engineering for fast-charging,damagetolerant thick electrodes of lithium-ion batteries[J].Advanced Energy Materials,2025,15(29):e70006.
[13]Diehm R,Kumberg J,Dörrer C,et al.In situ investigations of simultaneous two-layer slot die coating of component-graded anodes for improved high-energy Liion batteries[J]. Energy Technology,2020,8(5):1901251.
[14]Zhou H Y,Gao L T,Li Y M,et al.Electrochemical performance of lithium-ion batteries with two-layer gradient electrode architectures[J]. Electrochimica Acta,2024,476:143656.
[15]Yang J,Li Y J,Mijailovic A,et al. Gradient porosity electrodes for fast charging lithium-ion batteries[J].Journal of Materials Chemistry A,2022,10(22):12114-12124.
[16]Schneider C A,Rasband W S,Eliceiri K W.NIH Image to ImageJ:25 years of image analysis[J].Nature Methods,2012,9(7):671-675.
[17]Sulzer V,Marquis S G,Timms R,et al.Python battery mathematical modelling(PyBaMM)[J]. Journal of Open Research Software,2021,9(1):14.
[18]Chang C,Li X Q,Sun Y H,et al.Force-signal driven real-time lithium plating detection in mechanically constrained LiFePO4 pouch cells[J]. Energy,2025,323:135780.
[19]张双虎，迟彩霞，乔秀丽，等．锂离子电池负极析锂问题的分析及对策[J]．电源技术，2023,47(6):709-714.
基本信息:
DOI：10.19996/j.cnki.ChinBatlnd.2026.03.002
中图分类号:TM912
引用信息:
[1]袁文静,杨慧敏,安洪力,等.高活性物质负载快充负极孔隙调控[J].电池工业,2026,30(03):280-286.DOI:10.19996/j.cnki.ChinBatlnd.2026.03.002.
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