多向锻造对新能源汽车电池负极材料V_(3)TiNi_(0.56)Al_(0.2)储氢合金组织与性能的影响  

Effect of multi-directional forging on microstructure and properties of V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy for negative electrode material of new energy automotive batteries

作　　者：王广钢 葛动元 Wang Guanggang;Ge Dongyuan(School of Transportation,Shangqiu Polytechnic,Shangqiu 476000,China;School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]商丘职业技术学院交通学院,河南商丘476000 [2]广西科技大学机械与汽车工程学院,广西柳州545006

出　　处：《锻压技术》2025年第4期7-12,共6页Forging & Stamping Technology

基　　金：河南省高等学校重点科研项目(24B470006)。

摘　　要：V_(3)TiNi_(0.56)Al_(0.2)储氢合金是一种具有较大发展前景的钒基储氢合金。以V_(3)TiNi_(0.56)Al_(0.2)储氢合金为研究对象,采用多向锻造方法对其试样进行了锻造,并在显微组织、吸放氢性能以及充放电循环稳定性方面与锻前毛坯试样进行了对比分析。结果表明:多向锻造细化了V_(3)TiNi_(0.56)Al_(0.2)储氢合金的内部晶粒,改善了合金的吸放氢性能以及充放电循环稳定性。多向锻造V_(3)TiNi_(0.56)Al_(0.2)储氢合金的平均晶粒尺寸为13μm、最大吸氢量为2.854 wt.%、第1次充放电循环后即达到最大放电容量337.1 mAh·g^(-1)、充放电循环1000次后放电容量衰减率为15.0%。相较于锻造前的毛坯试样,经多向锻造处理后的V_(3)TiNi_(0.56)Al_(0.2)储氢合金锻件,平均晶粒尺寸减小35μm,最大吸氢量提高1.836%,最大放电容量增大181.4 mAh·g^(-1),放电容量衰减率减小56.6%。V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy is a vanadium-based hydrogen storage alloy with great development prospects.Taking V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy as the research object,the V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy sample was forged by multi-directional forging method,and a comparative analysis was conducted on the microstructure,hydrogen absorption and desorption properties,and charge-discharge cycle stability with those of the billet samples before forging.The results show that the multi-directional forging refines the grain inside the V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy and improves its hydrogen absorption and desorption properties and charge-discharge cycle stability.The average grain size of V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy after multi-directional forging is 13μm,the maximum hydrogen absorption capacity is 2.854 wt.%,the maximum discharge capacity reaches 337.1 mAh·g^(-1)after the first charge-discharge cycle,and the discharge capacity decay rate is 15.0%after 1000 charge-discharge cycles.Compared with the billet sample before forging,the average grain of V_(3)TiNi_(0.56)Al_(0.2)hydrogen storage alloy sample after multi-directional forging decreases by 35μm,and the maximum hydrogen absorption capacity increases by 1.836%,the maximum discharge capacity increases by 181.4 mAh·g^(-1),and the discharge capacity decay rate decreases by 56.6%.

关 键 词：V_(3)TiNi_(0.56)Al_(0.2)储氢合金 多向锻造 显微组织 吸放氢性能 充放电循环稳定性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]