[3] [3] Sondergaard R, Hosel M, Angmo D, et al. Roll-to-roll fabrication of polymer solar cells[J]. Materials Today, 2012, 15(1/2): 36-49.

[4] [4] Gunther T, Billot N, Schuster J, et al. The manufacturing of electrodes: Key process for the future success of lithium-ion batteries[C]// Adv. Mater. Research, 2016, 1140: 304-311.

[5] [5] Rupnowski P, Ulsh M, Sopori B, et al. In-line monitoring of Li-ion battery electrode porosity and areal loading using active thermal scanning-modeling and initial experiment[J]. J. of Power Sources, 2018, 375: 138-148.

[8] [8] Kramer W. Gauge for measuring the thickness of an unsupported web: United State, 5,210,593[P]. 1993-5-11.