(西安交通大學(xué) 金屬材料強(qiáng)度國家重點(diǎn)實(shí)驗(yàn)室， 西安 710049)
摘 要: 采用XRD分析了La1.3CaMg0.7Ni9儲(chǔ)氫合金的晶體結(jié)構(gòu)， 并研究了合金的氣相儲(chǔ)氫特性以及電化學(xué)性能。 結(jié)果表明， 合金由具有PuNi3結(jié)構(gòu)的LaNi3主相和LaNi5、 LaNi2.28第二相構(gòu)成； 在1.6MPa氫壓和300K下， 合金的儲(chǔ)氫量達(dá)到1.68%（質(zhì)量分?jǐn)?shù)）， 比純LaNi5的儲(chǔ)氫量提高了20%； 合金的活化性能良好， 經(jīng)3個(gè)充放電循環(huán)即可完全活化， 其放電容量達(dá)到395mA·h/g， 比AB5型儲(chǔ)氫合金的容量提高了23％， 經(jīng)100次循環(huán)后容量保持率為80%。
關(guān)鍵字: 儲(chǔ)氫合金； P-C-T曲線； 放電容量； 循環(huán)穩(wěn)定性
ZHU Jie-wu, LIU Yong-ning
（State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University, Xi′an 710049, China）
Abstract: The structure of La1.3CaMg0.7Ni9 hydrogen storage alloy was analyzed by XRD. The gas hydrogen storage characteristics and electrochemical properties of alloy were investigated. The results show that the prepared alloy is composed of LaNi3 with PuNi3 structure as matrix phase and LaNi5 and LaNi2.28 as secondary phases. At 1.6MPa H2 pressure and 300K the hydrogen storage capacity of alloy reaches to 1.68% (mass fraction), which is 20% higher than that of pure LaNi5. The activity of alloy is so good that the alloy is activated fully after 3 charging/discharging cycles. The discharge capacity of alloy reaches to 395mA·h/g, which is 23% higher than that of AB5 type hydrogen storage alloys. After 100 charging/discharging cycles, 80% of the initial capacity can remain.
Key words: hydrogen storage alloy； P-C-T curve； discharge capacity； cycle stability
