Ni-rich cathode materials have attracted considerable attention due to the high electrochemical capacities and prominent price advantage, while their extensive applications are still impeded by the poor structure stability induced by the intrinsic Li⁺/Ni²⁺ cation mixing and mechanical stress accumulation upon cycling. To address these issues, a typical negative thermal expansion (NTE) material ZrV₂O₇ (ZVO) is firstly employed as coating layer on LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) particles to promote the electrochemical performances through enhancing the structure stability upon repeated cycling and operating at high temperature. The NCM622@1.0 wt% ZVO sample exhibits excellent cyclability (71.0% capacity retension after 500 cycles under 25 °C and 67.0% capacity retension after 200 cycles under 55 °C) and rate capability (60.7% at 5 C). Further in-situ XRD analysis confirms that the structure stability of NCM622 could be prominently stabilized both under electrochemical and thermal treatments after ZVO decoration. Intensive investigation implies the unique functionalities of ZVO in restraining the stress accumulation and volume expansion, thus contributing to the bulk structure stability and interface compatibility of modified NCM622, besides the traditional effect of surface deposition layers (physical separation between solid electrode/electrolyte and inhibited irreversible surface side reactions).

富镍阴极材料由于其高电化学容量和突出的价格优势而备受关注，而其广泛的应用仍然受到固有的Li ⁺ / Ni ²⁺阳离子混合和循环时机械应力累积引起的不良结构稳定性的阻碍。。为了解决这些问题，首先采用典型的负热膨胀（NTE）材料ZrV ₂ O ₇（ZVO）作为LiNi _0.6 Co _0.2 Mn _0.2 O ₂上的涂层。（NCM622）颗粒通过在反复循环和在高温下运行时增强结构稳定性来提高电化学性能。NCM622@1.0 wt％ZVO样品具有出色的循环能力（在25°C下500次循环后容量保持率为71.0％，在55°C下200次循环后容量保持率为67.0％）和速率能力（在5 C下为60.7％）。进一步原位XRD分析证实，在ZVO装饰后，无论是电化学还是热处理，NCM622的结构稳定性都可以得到显着稳定。深入的研究表明，ZVO在抑制应力积累和体积膨胀方面具有独特的功能，因此除了表面沉积层的传统作用（固体电极/电解质之间的物理分离和抑制的不可逆作用）外，还有助于改性NCM622的整体结构稳定性和界面相容性。表面副反应）。