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Advanced rechargeable potassium-ion (K-ion) batteries are a new generation of battery systems and are deemed not only as lucrative low-cost battery alternatives to the current lithium-ion (Li-ion) technology but also as high voltage energy storage systems. The development of a K-ion battery with comparable performance as Li-ion battery is, however, a challenge because of the higher mass and larger ionic size of K-ion than that of Li-ion, which makes it difficult to identify materials (particularly cathodes) that can facilitate reversible insertion of the large K-ions at high voltages and
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