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Yolk–shell NiS ₂ /CuS hollow microspheres as an extraordinary kinetically pseudocapacitive nanoreactor for sodium-ion batteries manifest superb Na ⁺ -storage capability, including an ultrahigh ICE of 94.0%, remarkable specific capacity of 410.9 mA h g ⁻¹ after 750 cycles at 2.0 A g ⁻¹ , excellent rate capability, and prolonged cyclability in terms of a remarkable retention of 283.4 mA h g ⁻¹ even after 4200 cycles at 20.0 A g ⁻¹ .
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Zhao et al. (2021) studied this question.
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