Although great efforts have been made in investigating layered metal oxides for high-energy rocking-chair batteries, the capacities of conventional materials have reached the bottlenecks of theoretical values, which are critically dependent on the ability to (de)intercalate the single cation. In this work, we demonstrate a proof of concept, i.e., both cationic and anionic co-(de)intercalation into a typical layered oxide, which is firstly investigated in a P3-Na_0.5Ni_0.25Mn_0.75O₂. During the electrochemical process, the energy storage is not only provided by the conventional cationic (Na⁺) (de)intercalation with the charge compensation of cationic (Ni²⁺↔Ni⁴⁺) reversible redox, but also achieved by the release and uptake of anions (ClO₄⁻) accompanied by an anionic (O²⁻↔O⁻) reversible redox. Furthermore, the results show that the anion-participating electrochemical process is a fast-kinetics process, and the feasibility of this mechanism could extend to various anions.

尽管在研究用于高能摇椅电池的层状金属氧化物方面已经付出了巨大的努力，但是常规材料的容量已达到理论值的瓶颈，而理论值严重依赖于（去）嵌入单个阳离子的能力。在这项工作中，我们证明了概念的证明，即将阳离子和阴离子共（脱）嵌入典型的层状氧化物中，首先在P3-Na _0.5 Ni _0.25 Mn _0.75 O _{2中进行了研究}。在电化学过程中，不仅通过常规的阳离子（Na ⁺）（脱）插层以及阳离子（Ni 2 ⁺ ↔Ni4 ⁺）可逆的氧化还原，而且还由释放实现和阴离子的摄取（CLO ₄ ^- ）伴随着阴离子（O ^2- ↔O ^- ）可逆的氧化还原。此外，结果表明，参与阴离子的电化学过程是快速动力学过程，该机制的可行性可以扩展到各种阴离子。