Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 29, Pages 11239-11246Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta03407a
Keywords
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Funding
- National Science Foundation of China [21373154]
- National Key Basic Research Program of China [2015CB251100]
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Lithium ion batteries have now been used as a power source for electric vehicles; however, their safety still remains a serious concern as the accidents reported increase with the rapid increase of electric vehicles in transportation markets. To address this issue, we describe herein a novel temperature-responsive cathode by coating an ultra-thin layer of poly(3-octylthiophene) (P3OT) with a thickness less than 1 mm in between the Al substrate and cathode-active LiCoO2 layer to form a sandwiched Al/P3OT/LiCoO2 cathode (LCO-PTC). This LCO-PTC cathode demonstrates almost the same electrochemical performance as the conventional LiCoO2 cathode at ambient temperature but a strong PTC behavior to switch off the cell reaction in a high temperature range of 90-100 degrees C, thus protecting the cell from thermal runaway. Because of its easy fabrication, cost effectiveness and particularly good compatibility with the current battery technology, this new type of PTC electrode can be conveniently extended to other Li-insertion cathodes for building safer Li-ion batteries.
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