Optimization of Mechanical Milling Parameters of Negative Alloy for V-Ti Battery
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摘要: 采用不同机械球磨工艺参数进行了钒钛系电池负极合金V-20.5Ti-14Ni-6Co-4Al制备,并进行了充放电循环稳定性和耐腐蚀性能的测试与对比分析。结果表明:球磨转速和球磨时间对合金充放电循环稳定性和耐腐蚀性能产生明显影响。随球磨转速从300 r/min增至700 r/min、球磨时间从2 h延长至10 h,合金的充放电循环稳定性和耐腐蚀性能均先提高后下降。合金的球磨转速优选600 r/min、球磨时间优选6 h。与球磨转速300 r/min相比,球磨转速600 r/min时合金的放电容量衰减率减小16个百分点、腐蚀电位正移了81 mV。与球磨时间2 h相比,球磨时间6 h时合金的放电容量衰减率减小18个百分点、腐蚀电位正移了116 mV。Abstract: V-20.5 Ti-14 Ni-6 Co-4 Al battery alloy samples for negative electrode were prepared at different mechanical ball milling process parameters,and the charge-discharge cycle stability as well as the corrosion resistance of the obtained samples were tested and compared.The results show that the ball milling speed and time have a significant effect on the charge-discharge cycle stability and corrosion resistance of the alloys.With the increase of milling speed from 300 r/min to 700 r/min and the milling time from 2 h to 10 h,both of the charge-discharge cycle stability and corrosion resistance of the alloy increase first and then decrease.The ball milling speed and time of the alloy are optimized at 600 r/min and 6 h respectively.Compared with those of the alloy at the ball milling speed of 300 r/min,the decay rate of discharge capacity of the alloy at 600 r/min of ball milling speed decreases by 16% with the corrosion potential shifting positively by 81 mV.Compared with those of the alloy at the milling time of 2 h,the decay rate of discharge capacity of the alloy at the ball milling time of 6 h decreases by 18%,with the corrosion potential shifting positively by 116 mV.
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Key words:
- vanadium titanium battery /
- anode alloy /
- mechanical ball milling /
- speed /
- time /
- discharge capacity /
- corrosion potential
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