Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 351, Issue -, Pages 260-269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.03.015
Keywords
Lithium ion battery safety; Thermal stability; LiNixCoyMnzO2(NCM); Composite safety electrolyte; High energy density
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Funding
- National Key R&D Program of China [2016YFB0100306]
- National Natural Science Foundation of China [51674228]
- External Cooperation Program of BIC, CAS [211134KYSB20150004]
- Youth Innovation Promotion Association CAS [2013286]
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LiNixCoyMnzO2 (NCM) cathode material with high energy density is one of the best choices for power batteries. But the safety issue also becomes more prominent with higher nickel content. The improvement of thermal stability by material modification is often complex and limited. In this study, a composite safety electrolyte additive consisting of perfluoro-2-methyl-3-pentanone, N, N-Dimethylacetamide (and fluorocarbon surfactant is proved to be effective and simple in improving the thermal stability of NCM materials. Electrochemical compatibility of composite safety electrolyte with various NCM materials is investigated. Uniform interface film, lower impedance and polarization for NCM (622) cycled in composite safety electrolyte are proved to be the main reasons to ensure good cycle performance. Homemade pouch cells (NCM (622)/C) are used to verify the effectiveness for practical application, accelerating rate calorimeter and nail penetration test shows a slower temperature rise and delay of thermal runaway. For heating experiment, no fire appears for pouch cell with composite safety electrolyte. Thus, this composite safety electrolyte is effective to improve the safety of lithium ion batteries with NCM materials.(
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