CAJ | 학술논문

研究熔体快淬Al75_xSi25Crx(x=2,4,7,10,摩尔分数,％)锂离子电池合金负极材料的电化学性能.快淬带由纳米晶和非晶组成.电化学测试表明:负极材料存在活化过程；Al73Si25Cr2负极材料的最大比容量为1119mA·h/g,循环30次后可保持为586 mA·h/g:Al71Si25Cr4合金的循环性能更加稳定,经过30次循环后,容量仅衰减24％；嵌Li极片中未检测到含Li的金属间化合物；退火后,由于惰性相Al13Si4Cr4的形成,合金的比容量减小,嵌Li极片中出现A1Li相;固溶于非平衡态合金中的Cr降低了嵌Li活性,增强了结构稳定性,这是活化和抑制结构演变的主要原因.
연구용체쾌쉬Al75_xSi25Crx(x=2,4,7,10,마이분수,％)리리자전지합금부겁재료적전화학성능.쾌쉬대유납미정화비정조성.전화학측시표명:부겁재료존재활화과정；Al73Si25Cr2부겁재료적최대비용량위1119mA·h/g,순배30차후가보지위586 mA·h/g:Al71Si25Cr4합금적순배성능경가은정,경과30차순배후,용량부쇠감24％；감Li겁편중미검측도함Li적금속간화합물；퇴화후,유우타성상Al13Si4Cr4적형성,합금적비용량감소,감Li겁편중출현A1Li상;고용우비평형태합금중적Cr강저료감Li활성,증강료결구은정성,저시활화화억제결구연변적주요원인.
Melt-spun Al75-Si25Crx (x=2,4,7,10,mole fraction,％) alloys were investigated as anode materials for lithium-ion batteries.The as-quenched ribbons consist of nano-grains and metallic glass.The electrochemical measurements reveal that an activation behavior is exhibited in the anodes.The specific capacity of the Al73Si25Cr2 anodes can reach a maximum of 1 119 mA·h/g and maintain at 586 mA·h/g after 30 cycles.A more stable cycle performance is shown and a capacity loss is only 24％ over 30 cycles for Al71Si2sCr4.The intermetallic compounds with Li cannot be detected in the lithiated anodes.After the ribbons were annealed,the specific capacities become much lower due to the formation of inert Al13Si4Cr4,and an AlLi phase can be tested in the lithiated anodes.The Cr dissolved in the non-equilibrium alloys causes low lithiation activity and strong structure stability,which could be the main reason of the activation and a restriction of structure evolution.