多向锻造对汽车电池负极合金组织及性能的影响

    Effect of Multi-Directional Forging on Microstructure and Properties of Negative Electrode Alloys for Automobile Batteries

    • 摘要: 为了研究多向锻造对新能源汽车电池负极合金组织与性能的影响,对V3TiNi0.56Al0.3新能源汽车电池负极合金进行了多向锻造试验,并通过金相显微镜、扫描电镜、充放电循环试验和耐碱液腐蚀试验等方法,进行了多向锻造合金与未锻造合金的显微组织、电化学稳定性和耐碱液腐蚀性能的测试与对比分析。结果表明:与未锻造合金相比,多向锻造合金内部晶粒明显细化,组织分布更均匀,第二相呈密集连续的三维网状分布;充放电循环100次后多向锻造合金的放电容量衰减率减小了46%,合金的电化学稳定性大幅提高;多向锻造合金的腐蚀电位正移了109 mV,合金耐碱液腐蚀性能得到改善。多向锻造V3TiNi0.56Al0.3新能源汽车电池负极合金具有更好的市场应用前景。

       

      Abstract: In order to study the effect of multi-directional forging on microstructure and properties of the negative electrode alloy for new energy vehicle battery,the multi-directional forging tests of V3TiNi0.56Al0.3 negative electrode alloy for new energy vehicle battery were carried out,and the microstructure,electrochemical stability and alkali corrosion resistance of multidirectional forged alloy and unforged alloy were tested and analyzed by metallographic microscope,scanning electron microscope,charge-discharge cycle test and alkali corrosion resistance test.The results show that After charge-discharge for 100 cycles the grains in the alloy with multi-directional forging are obviously refined,the distribution of microstructure is more uniform,and the second phase presents dense and continuous three-dimensional network.the discharge capacity decay rate of the multi-directional forged alloy is decreased by 46%,and the electrochemical stability of the alloy is greatly improved;the corrosion potential of the multidirectional wrought alloy is shifted by 109 mV,and the alkali corrosion resistance of the alloy is improved.The multi-directional forging V3TiNi0.56Al0.3 alloy negative electrode alloy for new energy vehicle battery has a better market application prospect.

       

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