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研究了冷却速率对TiV2.1Ni0.4Zr0.06Cu0.03Cr0.1合金的相结构及电化学性能的影响。XRD、EBI、EDS分析表明,合金主要由V基固溶体主相和以网状分布于主相晶界的Ti2Ni基第二相组成。电化学测试表明,冷却速率较快时合金的最大放电容量、交换电流密度、极限电流密度和循环稳定性都得到提高。而高倍率性能下降是由于在较大的电流密度下快冷样品中第二相催化相在碱液中的溶解析出速率较快造成的。
The effect of cooling rate on the phase structure and electrochemical performance of TiV2.1Ni0.4Zr0.06Cu0.03Cr0.1 alloy was studied. The results of XRD, EBI and EDS show that the alloy consists of the main phase of the V-based solid solution and the second phase of Ti2Ni based on the grain boundaries of the main phase. Electrochemical tests show that the maximum discharge capacity, the exchange current density, the limiting current density and the cycle stability of the alloy are all improved when the cooling rate is high. The high rate of performance degradation is due to the larger current density fast cooling samples in the second phase of the catalytic phase in the lye solution dissolution rate faster.