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International Journal of Electrochemical Science · 2023 ·Vol. 12 ·期 8 ·6930-6939 · IF 1.5

Enhanced Electrochemical Performance of LiFePO4 as Cathode for Lithium Ion Battery by Codoping with Titanium and Nitrogen

Wei Su,Kaiqi Xu,Guobin Zhong,Zengfu Wei,Chao Wang,Yuezhong Meng

Titanium and nitrogen codoped LiFePO 4 was synthesized via a simple solid state reaction using TiN as the dopant source. The morphology, structure, valence state and electrochemical performance of all the samples were investigated and compared with the undoped LiFePO 4 . The results showed that the codoped samples maintained an olivine structure with modified lattice parameters and exhibited a prominent improved electrochemical performance. Among all the codoped samples, LiFe 0.94 Ti 0.04 PO 4-σ N 0.04 showed the best rate capability of 108.1 mAh g -1 even at a high rate of 5 C and exhibited a capacity retention of about 94% after 100 cycles at 1 C.

研究领域: 材料科学 · 电化学 · 能源存储 · 无机化学 · 固态化学

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JOURNAL OF ELECTROANALYTICAL CHEMISTRY · 2017 · IF 3.012

Electrochemical investigation of electrochromic device based on WO3 and Ti doped V2O5 films by using electrolyte containing ferrocene

Y.X. Wei,Y.B. Ma,M. Chen,W.M. Liu,L. Li,Y. Yan

Electrochromic devices (ECDs) based on WO 3 and Ti doped V 2 O 5 films are fabricated by using lithium (LiClO 4 ) liquid electrolyte containing ferrocene redox couple . The addition of ferrocene in electrolyte enhances electrochromic properties of device. The device based on LiClO 4 -Ferrocene electrolyte has larger charge density than that based on LiClO 4 electrolyte. In the 600–1500 nm wavelength range, the transmittance of colored device is under 2% and it has faster coloring response. At 680 nm wavelength, it shows larger changes in transmittance from 68% to 1.8% while device based on LiClO 4 electrolyte changes transmittance from 68.3% to 11.5%. The cycling data reveal that device based on LiClO 4 -Ferrocene electrolyte can yield more stable electrochromic properties at 65 °C than room temperature. In order to deeper understand the effect of electrolyte on films and devices, electrochemical impedance spectroscopy (EIS) and the voltage distribution of films based on an analog cell are separately measured and analyzed in LiClO 4 and LiClO 4 -Ferrocene electrolytes. Results indicate that compared with LiClO 4 electrolyte, films have lower charge-transfer resistance and the distributed voltage on Ti doped V 2 O 5 film is larger in LiClO 4 -Ferrocene electrolyte, which can enhance optical properties of ECD by improving charge density of Ti doped V 2 O 5 film.

研究领域: 材料科学 · 电化学 · 功能材料 · 纳米科技 · 能源技术

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Enhanced Electrochemical Performance of LiFePO4 as Cathode for Lithium Ion Battery by Codoping with Titanium and Nitrogen

Electrochemical investigation of electrochromic device based on WO3 and Ti doped V2O5 films by using electrolyte containing ferrocene