锡镍合金负极材料的制备及电化学性能研究

Synthesis and electrochemical performance study of the tin-nickel alloy negative materials

在碱性镀液中,用脉冲电镀法制得具有单斜Ni3Sn4结构的锡镍合金负极材料。采用充放电循环实验、X射线衍射光谱法(XRD)、阻抗、环境扫描电镜(SEM)等研究了影响样品电化学性能的因素。实验结果表明,由组成为45g/L硫酸镍、75g/L乙二胺四乙酸二钠、40g/L酒石酸钾钠、250g/L焦磷酸钾和40g/L锡酸钠的镀液制得样品表面含有孔径为200～300nm的孔洞。在1.5～0.01V的电压区间,以100mA/g的电流放电时,该样品第1次循环的放电比容量为764mAh/g,第50次循环的放电比容量为405mAh/g。充放电的库仑效率较高。

A series of tin-nickel alloy negative materials with a monoclinic Ni3Sn4 structure （ Space group ： C2/m ） were prepared by a pulse electrode position method from an alkaline solution. The charge-discharge test, XRD, electrochemical impedance spectra and environmental SEM were carried out to study the electrochemical performance of the samples. The experimental results show that the sample prepared from a alkaline solution, in which contained 45 g/L NiSO4·6 H2O, 75 g/L Na2EDTA·2 H2O, 40 g/L KNaC4H4O6·4 H2O, 250 g/L K4P2O7·3 H2O and 40 g/L Na2SnO3·3 H2O, exhibits the capacities of 764 mAh/g in the 1st cycle and 405 mAh/g in the 50 th cycle in the voltage range of 1.5 to 0.01 V at a discharge current of 100 mA/g. The charge-discharge cycles of the sample possess higher coulomb efficiencies than previous samples＇. The sample surface shows the porous performance with an aperture diameter of 200 to 300 nm.