hard carbon的用法和樣例：
例句
- The positive electrode is a rod of hard carbon fitted with a brass cap.
正電極是一個(gè)裝有黃銅帽的硬碳棒。 - Hard carbon is a promising anode material for lithium ion batteries due to its high capacity and low cost.
摘要硬碳具有嵌鋰容量大，造價(jià)低，循環(huán)壽命長(cháng)等優(yōu)點(diǎn)，是制備高安全性鋰離子電池負極潛在的優(yōu)良材料。
