In　order　to　improve　the　electrochemical　performance　of　RENi3.2Mn0.2Al0.15　hydrogen　storage　alloy(RE　is　a　composite　rare　earth　Y1-xLax)for　automotive　battery　anodes,RENi3.2Mn0.2Al0.15　hydrogen　storage　alloy　was　prepared　by　vacuum　arc　melting　method,the　effects　of　rare　earth　Y1-xLax　composite　addition　and　x　value　on　the　phase　structure,morphology　and　electrochemical　performance　of　the　hydrogen　storage　alloy　were　investigated.The　results　indicated　that　when　x=0　and　0.15,the　hydrogen　storage　alloy　was　mainly　composed　of　LaNi5　and　Ce2Ni7　phases.When　x=0.25,0.33,and　0.50,the　hydrogen　storage　alloy　was　mainly　composed　of　Ce5Co19　type　and　Ce2Ni7　type　phases.When　x=0.75　and　1.00,hydrogen　storage　alloys　were　mainly　composed　of　PuNi3　type,LaNi5　type,and　Ce2Ni7　type　phases.Different　types　of　phases　exhibited　different　diffraction　contrast　under　scanning　electron　microscopy,and　the　microscopic　morphology　observed　by　scanning　electron　microscopy　was　consistent　with　the　X-ray　diffraction　pattern　test　results.When　x=0~1.00,the　activation　frequency　of　hydrogen　storage　alloys　was　ranged　from　2　to　4　times.As　x　was　increased　from　0　to　1.00,the　abundance　of　Ce2Ni7　phase,discharge　capacity,　and　capacity　retention　rate　at　100　cycles(S100)in　the　hydrogen　storage　alloy　showed　trend　of　firstly　increased　and　then　decreased.At　x=0.33,the　maximum　abundance　of　Ce2Ni7　phase(93.07%),maximum　discharge　capacity(372.6　mA·h/g),and　maximum　S100　value(89.01%)were　obtained.The　trend　of　discharge　capacity　change　in　the　hydrogen　storage　alloy　was　consistent　with　that　of　Ce2Ni7　phase　abundance.The　corrosion　current　density　i　of　hydrogen　storage　alloy　electrodes　was　negatively　correlated　with　S100,indicating　that　the　corrosion　resistance　of　hydrogen　storage　alloys　was　the　main　factor　affecting　cycling　performance.The　hydrogen　diffusion　coefficient　D0　of　hydrogen　storage　alloys　was　positively　correlated　with　HRD900,indicating　that　the　high　rate　discharge　performance　of　hydrogen　storage　alloys　was　determined　by　the　diffusion　rate　of　hydrogen.　©　2025　Editorial　Office　of　Inorganic　Chemicals　Industry.　All　rights　reserved.