Conductive agents are used to ensure electrodes have good charge and discharge performance. Usually, a certain amount of conductive material is added during the production of the pole piece, and the micro current is collected between the active material and the current collector to reduce the micro current.[1][2][3] The contact resistance of the electrode accelerates the rate of movement of electrons, and at the same time, can effectively increase the migration rate of lithium ions in the electrode material, thereby improving the charge and discharge efficiency of the electrode. The conductive agent carbon black is used for improving the conductivity of the electrodes and decreasing the resistance of interaction.[1]

Carbon black conductive agent

The conductive carbon black is characterized by small particle size, particularly large specific surface area, and particularly good electrical conductivity, and it can function as a liquid absorption and liquid retention in the battery.[4]

The carbon black conductive agents: acetylene black, 350G, carbon fiber (VGCF), carbon nanotubes (CNTs), Ketjen black (Ketjenblack EC300J, Ketjenblack EC600JD, Carbon ECP, Carbon ECP600JD).[5]

Acetylene Black (Polyacetylene): carbon black obtained by continuous pyrolysis of acetylene having a purity of 99% or more obtained by decomposing and purifying by-product gas during pyrolysis of calcium carbide method or naphtha (crude gasoline).

Ketjen Black: High-efficiency superconducting carbon black for lithium batteries, branched, high purity, and excellent electrical conductivity.

Graphite conductive agent: KS-6, KS-15, SFG-6, SFG-15, etc.[6]

CNTs: the incorporation of CNTs as a conductive additive at a lower weight loading than conventional carbons, like carbon black and graphite, presents a more effective strategy to establish an electrical percolation network.[7]

References

  1. 1 2 Pi, Yu-Tong; Li, Yin-Tao; Xu, Shan-Shan; Xing, Xiang-Ying; Ma, Hai-Kun; He, Zhan-Bing; Ren, Tie-Zhen (2016). "Is the conductive agent useful in electrodes of graphitized activated carbon?". RSC Advances. 6 (103): 100708–100712. doi:10.1039/C6RA18246A. ISSN 2046-2069.
  2. ↑ Zhang, Weike; Wang, Jiawei; Bao, Luyu; Gao, Zeyu; Yu, Junsheng (2019-06-01). "Nanopores created by carbon onion conductive agent providing enhanced capacitance in supercapacitors". Diamond and Related Materials. ScienceDirect. 96: 231–236. doi:10.1016/j.diamond.2019.05.015.
  3. ↑ Kang, Kisuk; Lee, Myeong Hwan; Seong, Won Mo; Kim, Jung-Joon; Yoon, Kyungho (2018-05-23). "Investigation on the interface between Li 10 GeP 2 S 12 electrolyte and carbon conductive agents in all-solid-state lithium battery". Scientific Reports. Nature. 8: 8066. doi:10.1038/s41598-018-26101-4. PMC 5966405.
  4. ↑ Kuroda, Shintaro; Tobori, Norio; Sakuraba, Mio; Sato, Yuichi (2003). "Charge–discharge properties of a cathode prepared with ketjen black as the electro-conductive additive in lithium ion batteries". Journal of Power Sources. ScienceDirect. 119–121: 924–928. doi:10.1016/s0378-7753(03)00230-1.
  5. ↑ Takamura, Tsutomu; Saito, Morihiro; Shimokawa, Atushi; Nakahara, Chieko; Sekine, Kyoichi; Maeno, Siji; Kibayashi, Naoki (2000). "Charge/discharge efficiency improvement by the incorporation of conductive carbons in the carbon anode of Li-ion batteries". Journal of Power Sources. ScienceDirect. 90: 45–51. doi:10.1016/s0378-7753(00)00446-8.
  6. ↑ "graphite" (PDF).
  7. ↑ Landi, Brian J.; Ganter, Matthew J.; Cress, Cory D.; DiLeo, Roberta A.; Raffaelle, Ryne P. (2009). "Carbon nanotubes for lithium ion batteries". Energy & Environmental Science. 2 (6): 638. doi:10.1039/b904116h. ISSN 1754-5692.
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