In the context of electric vehicle batteries, consider the following elements:
I. Cobalt
II. Graphite
III. Lithium
IV. Nickel
How many of the above usually make up battery cathodes?
विद्युत वाहन बैटरियों के संदर्भ में निम्नलिखित तत्वों पर विचार कीजिए : I. कोबाल्ट II. ग्रेफाइट III. लिथियम IV. निकेल। उपर्युक्त में से कितने सामान्यतः बैटरी कैथोड के निर्माण में प्रयुक्त होते हैं?
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