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- 저자 : Youlong Wang (검색결과 2 건)
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The Effect of K-Ion on the Electrochemical Performance of Spinel LiMn2O4
Lilong Xiong,Youlong Xu,Xiang Xiao,Jie Wang,Yutao Li 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Spinel LiMn2O4 is regarded as one of the cathode active materials for rechargeablelithium-ion batteries with the most potential. K+-ion modified LiMn2O4 samples aresynthesized by solid-state reaction. The SEM analysis shows that the modifiedsamples exhibit uniform particle size distribution and much better crystallinity. Themodified sample K1 exhibits ionic diffusion coefficient of 1.43 × 10−10 cm−2 s−1 and2.04 × 10−10 cm−2 s−1, which is much higher than that of the un-modified spinelLiMn2O4 sample. The electrochemical measurements show that K+-ion modificationcould effectively reduce the charge transfer resistance, improve the capacityretention and rate capacity of the spinel materials.
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Wenshan Li,Xuhui Wen,Jian Zhang,Youlong Wang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.6
This paper describes a narrow pulse suppression method that is called hybrid modulation strategy for T-type neutral point clamped (TNPC) three-level converters. Conventional VSVPWM does not function well in high-frequency TNPC converters due to the problem of narrow pulses during the permanent magnet synchronous motor (PMSM) starting process. The narrow pulse phenomenon occurs when the ON/OFF state time of the driving pulse is less than the minimum time required by the power devices. The narrow pulse threatens the safe operation of power devices and results in a high surge voltage and electromagnetic interference. In addition, neutral point voltage unbalance is caused by the narrow pulse in motor starting process. The eff ects of the narrow pulse on the surge voltage and the neutral point voltage are both discussed in this paper. The minimum pulse width function is designed to defi ne the relationship between the gate drive signal and the modulation strategy. The switch pattern limited region of the virtual space vector modulation strategy is analyzed by the minimum pulse width function under both low and high modulation indexes. A resistance inductance load and a PMSM drive system test setup based on a TNPC three-level converter are both established to verify the analysis and eff ectiveness of the proposed method.
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