优选地，电惰性材料的浓度也从阴极侧朝着阳极侧逐渐减小。
Preferably, the concentration of the electrically inert material also gradually decreases from the cathode side toward the anode side.
优选地，电惰性材料的浓度也从阴极侧朝着阳极侧逐渐减小。
Preferably, the concentration of the electrically inert material also gradually decreases from the cathode side toward the anode side.
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