对比研究了熔体旋淬和常规熔铸合金Zr0 .9Ti0 .1(Ni,Co ,Mn ,V) 2 .1的微结构和电化学性能 .XRD分析表明 :熔体旋淬合金在退火前后的晶体结构和铸态合金一样 ,均为面心立方结构 ,由LaveC15相组成 ;并且随旋淬速度的增加 ,旋淬合金中的非晶成分越多 .电化学测试表明 :旋淬合金有较好的活化性能 ,但其最大放电容量较低 ,小于 2 80mAh/g ;而退火后的旋淬合金需经 30次循环才能完全活化 ,其最大放电容量皆为 34 0mAh/g左右 ,高于铸态合金和退火前的旋淬合金 ;在电流密度为 30 0mA/g下进行充放电循环 ,发现退火后的旋淬合金循环稳定性明显高于铸态合金电极 ,并且随旋淬速度的增加 ,循环稳定性越好 ,经过 80 0次循环后 ,退火后的 4 0m/s合金容量保持率高达 85 % ,容量衰减率只有 6.9%
文明芬
,
佟敏
,
陈廉
,
郑华
,
马荣俊
. 熔体旋淬合金Zr_(0.9)Ti_(0.1)(Ni,Co,Mn,V)_(2.1)的微结构与电化学性能[J]. 电化学, 2001
, 7(3)
: 288
-293
.
DOI: 10.61558/2993-074X.1427
The microstructure and electrochemical properties of Zr 0.9 Ti 0.1 (Ni,Co,Mn,V) 2.1 alloys prepared by both the melt_spinning method and the conventional induction melting were investigated. XRD studies show that Zr 0.9 Ti 0.1 (Ni,Co,Mn,V) 2.1 alloys at as_cast,melt_spinning and annealing are all face center cubic structure with C15 laves phase,the higher the melt_spinning rate,the more the amorphous content.The electrochemical measurements show that melt_spinning alloys have better active behavior,low discharge capacity(<280 mAh/g); but after annealed,the alloys are activated completely with 30 cycles, the capacities about 340 mAh/g are higher than those of as_cast and melt_spinning alloys;the annealec alloys have a better cycle stability than that of as_cast alloy, and the higher the melt_spinning rate is, the more stable the alloy becomes; at 300 mAh/g current density,the capacity of annealed 40 m/s alloy is up to 85% of the maximum capacity after 800 cycles, the capacity decay rate is about 6.9%.
[1] IwakuraC ,KiwnI ,MatsulN .Surfacemodificationoflaves_phaseZrV0.5Mn0.5Nialloyelectrodeswithandal kalinesolutioncontainingpotassiumborohydrideasareducingagent[J].ElectrochemActa,1995,40:561.
[2] YanDY ,SandrochG ,SudaS .SurfacemodificationofZr0.5Ti0.5V0.75Ni1.25alloyelectrodein6mol/LKOH[J].JournalofAlloysandCompounds.1994,216:237~242.
[3] J .H .Jung,H .H .Lee,D .M .Kim,etal.NewactivationprocessforZr_Ti_Cr_Mn_V_Nialloyelectrodes:thehot_chargingtreatment[J].JournalofAlloysandCompounds,1997,253~254:652~655.
[4] Bin_HongLiu,Jae_HanJung,Han_HoLee,etal.ImprovedelectrochemicalperformanceofAB2_typemetalhy drideelectrodesactivatedbythehot_chargingprocess[J].JournalofAlloysandCompounds,1996,245:132~141.
[5] Jae_HanJung,Ki_YongLee,Jai_YoungLee.TheactivationmechanismofZr_basedalloyelectrodes[J].JournalofAlloysandCompounds,1995,226:166~169.
[6] MishimaR ,MiyamuraH ,SakaiT ,etal.Hydrogenstoragealloysrapidlysolidifiedbythemelt_spinningmethodandtheircharacteristicsasmetalhydrideelectrodes[J].J .AlloysCompd.,1993,192:176.
[7] ChenL ,WuF ,TongM ,etal.AdvancednanocrystallineZr_basedAB2 hydrogenstorageelectrodematerialsforNiMHEVbatteries[J].J.AlloysCompd.,1999,293~295:508~520.
[8] AndreasZ ,DanielC ,ChrstofN ,etal.BulkandsurfacepropertiesofcrystallineandamorphousZr36(V0.33Ni0.66)64 alloyasactiveelectrodematerial[J].J.AlloysCompd.,1998,266:321~326.
[9] Chuan_jianL ,Xin_linW .InvestigationsonthecyclestabilityandstructureoftheMmNi3.6Co0.75Mn0.55Al0.1hydrogenstoragealloy[J].J .AlloysCompd.,1999,284:270~273