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Energy Density of Cylindrical Li-Ion Cells: A Comparison of Commercial 18650 to the 21700 Cells

Open access
Quinn, Jason B., Waldmann, Thomas, Richter, Karsten, Kasper, Michael, Wohlfahrt-Mehrens, Margret·2018·Journal of The Electrochemical Society

Abstract

The standard format for cylindrical Li-ion cells is about to change from 18650-type cells (18mm diameter, 65mm height) to 21700-type cells (21mm diameter, 70mm height). We investigated the properties of five 18650 cells, three of the first commercially available 21700, and three types of the similar 20700 cells in detail. In particular, the (i) specific energy/energy density and electrode thickness, (ii) electrode area and cell resistance, (iii) specific energy as a function of discharge C-rate, as well as (iv) heating behavior due to current flow are analyzed. Finally, the production effort for cells and packs are roughly estimated for 21700 cells compared to 18650 cells.

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Metadata

Authors
Quinn, J. B., Waldmann, T., Richter, K., Kasper, M., & Wohlfahrt-Mehrens, M.
Venue
Journal of The Electrochemical Society
Published
2018
Volume
165
Issue
14
Pages
A3284-A3291
ISSN
  • 0013-4651 (ISSN-L)
  • 1945-7111
OpenAlex
W2897375170
Cited by
212
References
4
FWCI
8.67
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Energy Density of Cylindrical Li-Ion Cells: A Comparison of Commercial 18650 to the 21700 Cells. https://app.cochat.ai/papers/10.1149/2.0281814jes
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Quinn, J. B., Waldmann, T., Richter, K., Kasper, M., & Wohlfahrt-Mehrens, M. (2018). Energy Density of Cylindrical Li-Ion Cells: A Comparison of Commercial 18650 to the 21700 Cells. Journal of The Electrochemical Society. https://doi.org/10.1149/2.0281814jes

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