期刊
RSC ADVANCES
卷 7, 期 37, 页码 23157-23163出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra02581e
关键词
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资金
- National Natural Science Foundation of China [51377097, 51577104]
- China Postdoctoral Science Foundation [2014M560079]
Severe deterioration of lithium-ion cells at low temperatures constitutes one of the bottlenecks for the wide adoption of electric vehicles. Notwithstanding the remarkable progress in fundamental understanding, a knowledge gap remains in how the low-temperature aging depends on the material chemistry, the application orientation that is mainly dictated by electrode structure, and the cell format. In this contribution, four types of lithium-ion cells that are different in application orientation (power or energy), cathode chemistry (LiNixMnyCo1-x-yO2 or LiNixCoyAl1-x-yO2), and cell format (18 650 cell or pouch cell) are subjected to low-temperature cycling tests. The aging phenomena and mechanisms during low-temperature cycling are systematically analyzed using electrochemical methods. Cell resistance increases more remarkably for energy-type cells, while cell capacity decreases more quickly for power-type cells during low-temperature cycling. Different material chemistries lead to different limiting processes during low-temperature cycling. Generated heat dissipates much more easily for pouch cells than for 18 650 cells, thereby making lithium plating more serious for pouch cells during low-temperature cycling.
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