不衰减 meaning in English

fadeless
unattenuated

Secondly , better performance lifepo4 / c composite was synthesized by adding proper content of sucrose to the reactants , test results exhibited the initial discharge capability could get 130mah . g - 1 and the capability didn ’ t fade down after more than ten cycles ’ test
2 .添加适量的蔗糖制备出电化学性能良好的lifepo _ 4 / c复合的正极材料,其初始放电比容量高达130mah . g - 1 ;经10次充放电循环,材料的比容量几乎不衰减。