Journal
COMPOSITES PART B-ENGINEERING
Volume 177, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2019.107448
Keywords
Lithium-ion batteries; Hexagonal boron nitride; Lanthanum oxide; Bi-layer; High-rate capacity
Funding
- Fundamental Research Funds for the Chinese Central Universities [ZYGX2015Z003]
- Science & Technology Support Funds of Sichuan Province [2016GZ0151]
- National Natural Science Foundation of China [81572418, 15JCQNJC10100]
- Science and Technology Development Foundation of Tianjin's Colleges and Universities [20140116]
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Poly(vinylidene fluoride-hexafluoropropylene)-lanthanum oxide//poly(vinylidene fluoride-hexafluoropropylene)-hexagonal boron nitride (PVH-LaO//PVH-BN) bi-layer separators are developed through a two-step blading approach. La2O3 in the PVH matrix enhances the Li+ conduction by providing extra Li+ conducting pathways owing to the Lewis acid-base interaction of La atoms with the PVH chains, leading to a high lithium-ion transference number of 0.72 and ionic conductivity of 7.5 x 10(-4) S cm(-1) at room temperature. Moreover, the strong interfacial interaction between h-BN and PVH in the bi-layer separator enhances the thermal and mechanical stabilities of the separator. Batteries based on lithium iron phosphate and the bi-layer separator deliver a discharge capacity of 158 mAh g(-1) at 0.5 C after 100 cycles and a rate capacity of 81 mAh g(-1) at 10 C after 1500 cycles.
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