Hard carbon is a solid form of carbon that cannot be converted to graphite by heat-treatment, even at temperatures as high as 3000 °C.[1][2][3] It is also known as char, or non-graphitizing carbon. More colloquially it can be described as charcoal.

Hard carbon is produced by heating carbonaceous precursors to approximately 1000 °C in the absence of oxygen. Among the precursors for hard carbon are polyvinylidene chloride (PVDC), lignin and sucrose. Other precursors, such as polyvinyl chloride (PVC) and petroleum coke, produce soft carbon, or graphitizing carbon. Soft carbon can be readily converted to graphite by heating to 3000 °C.

The physical properties of the two classes of carbons are quite different. Hard carbon is a low density material, with extremely high microporosity, while soft carbon has little microporosity. Hard carbon is extensively used as anode materials in lithium-ion batteries[4] and sodium-ion batteries.[5][6]

Manufacturers of hard carbon include Xiamen Tob New Energy (China), Kuraray (Japan) and Stora Enso (Finland).

See also

References

  1. ↑ Zheng, Honghe; Qu, Qunting; Zhang, Li; Liu, Gao; Battaglia, Vincent (2012). "Hard carbon: a promising lithium-ion battery anode for high temperature applications with ionic electrolyte". RSC Advances. Royal Society of Chemistry. 2 (11): 4904–4912. Bibcode:2012RSCAd...2.4904Z. doi:10.1039/C2RA20536J. Retrieved 2020-08-15.
  2. ↑ Kamiyama, Azusa; Kubota, Kei; Nakano, Takeshi; Fujimura, Shun; Shiraishi, Soshi; Tsukada, Hidehiko; Komaba, Shinichi (2020-01-27). "High-Capacity Hard Carbon Synthesized from Macroporous Phenolic Resin for Sodium-Ion and Potassium-Ion Battery". ACS Applied Energy Materials. American Chemical Society. 3: 135–140. doi:10.1021/acsaem.9b01972.
  3. ↑ Khosravi, Mohsen; Bashirpour, Neda; Nematpour, Fatemeh (2013-11-01). "Synthesis of Hard Carbon as Anode Material for Lithium Ion Battery". Advanced Materials Research. 829: 922–926. doi:10.4028/www.scientific.net/AMR.829.922. S2CID 95359308. Retrieved 2020-08-15.
  4. ↑ Goriparti, Subrahmanyam; Miele, Ermanno; De Angelis, Francesco; Di Fabrizio, Enzo; Proietti Zaccaria, Remo; Capiglia, Claudio (2014). "Review on recent progress of nanostructured anode materials for Li-ion batteries". Journal of Power Sources. 257: 421–443. Bibcode:2014JPS...257..421G. doi:10.1016/j.jpowsour.2013.11.103. hdl:10754/552380.
  5. ↑ Irisarri, E; Ponrouch, A; Palacín, MR (2015). "Review-Hard Carbon Negative Electrode Materials for Sodium-Ion Batteries". Journal of the Electrochemical Society. 162 (14): A2476–A2482. doi:10.1149/2.0091514jes. S2CID 101160488.
  6. ↑ Dou, Xinwei; Hasa, Ivana; Saurel, Damien; Vaalma, Christoph; Wu, Liming; Buchholz, Daniel; Bresser, Dominic; Komaba, Shinichi; Passerini, Stefano (2019). "Hard carbons for sodium-ion batteries: Structure, analysis, sustainability, and electrochemistry". Materials Today. 23: 87–104. doi:10.1016/j.mattod.2018.12.040.
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