Constructing a reliable and favorable electrode-electrolyte interface is crucial to utilize the exceptional energy storage capability in commercial lithium-ion batteries.Here,we report a facile synthesis approach for ...Constructing a reliable and favorable electrode-electrolyte interface is crucial to utilize the exceptional energy storage capability in commercial lithium-ion batteries.Here,we report a facile synthesis approach for the lithium difluorophosphate(LiPO_(2)F_(2))solution as an effective film-forming additive via direct adding the Li_(2)CO_(3) into LiPF6 solution at 45℃.Benefiting from the significantly reduced interface resistance(RSEI)and charge transfer impedance(Rct)of both the cathode and anode by adding the prepared LiPO_(2)F_(2)solution into a baseline electrolyte,the cycling performance of the graphite||LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2) pouch cell is remarkably improved under all-climate condition.展开更多
Layered F-doped cathode materials 0.3 Li_2 MnO_3-0.7 LiMn_(1/3)Ni_(1/3)CO_(1/3))O_(2-x)F_x(x = 0, 0.01, 0.02, 0.03, 0.04,0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation me...Layered F-doped cathode materials 0.3 Li_2 MnO_3-0.7 LiMn_(1/3)Ni_(1/3)CO_(1/3))O_(2-x)F_x(x = 0, 0.01, 0.02, 0.03, 0.04,0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation method. The sample of x = 0.02 demonstrates a large discharge capacity of226 mAh g^(-1) over 100 cycles at 0.1 C and excellent rate performance with discharge capacity of 96 mAh g-1 at 5.0 C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 ℃. It delivers a quite high discharge capacity of 233.7 mAh·g^(-1) at 1.0 C with capacity retention as high as 97.9% after 100 cycles. The results demonstrate that the fluorine incorporation stabilizes the cathode structure and maintains stable interfacial resistances.展开更多
基金National Natural Science Foundation of China(Nos.21935009,21761132030 and 21621091)National Key Research and Development Program of China(No.2018YFB0905400)the Doctoral Research Foundation of Binzhou University(No.2016Y06)。
文摘Constructing a reliable and favorable electrode-electrolyte interface is crucial to utilize the exceptional energy storage capability in commercial lithium-ion batteries.Here,we report a facile synthesis approach for the lithium difluorophosphate(LiPO_(2)F_(2))solution as an effective film-forming additive via direct adding the Li_(2)CO_(3) into LiPF6 solution at 45℃.Benefiting from the significantly reduced interface resistance(RSEI)and charge transfer impedance(Rct)of both the cathode and anode by adding the prepared LiPO_(2)F_(2)solution into a baseline electrolyte,the cycling performance of the graphite||LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2) pouch cell is remarkably improved under all-climate condition.
基金financially supported by the National Natural Science Foundation of China (No. 51372136)the NSFC-Guangdong United Fund (No. U1401246)
文摘Layered F-doped cathode materials 0.3 Li_2 MnO_3-0.7 LiMn_(1/3)Ni_(1/3)CO_(1/3))O_(2-x)F_x(x = 0, 0.01, 0.02, 0.03, 0.04,0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation method. The sample of x = 0.02 demonstrates a large discharge capacity of226 mAh g^(-1) over 100 cycles at 0.1 C and excellent rate performance with discharge capacity of 96 mAh g-1 at 5.0 C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 ℃. It delivers a quite high discharge capacity of 233.7 mAh·g^(-1) at 1.0 C with capacity retention as high as 97.9% after 100 cycles. The results demonstrate that the fluorine incorporation stabilizes the cathode structure and maintains stable interfacial resistances.
