近年来，高电压LiCoO₂（LCO）正极的研发成为学术界和工业界广泛关注的焦点。研究表明，解决表面问题是提升高电压LCO性能的最有效途径。本综述系统回顾了高电压LCO所面临的问题，包括相变和裂纹的生成、与氧氧化还原相关的问题以及副反应，以及表面结构的退化。接着，我们深入阐述了表面调制，以及表面调制与电解质调制之间的相互作用。最后，我们展望了更先进的LCO正极的发展前景，包括低成本高质量的制造，设计适用于极端条件（如高温、高速充电、低温等）的LCO正极，并实现约220 mAh·g^-1的稳定容量释放。我们期望这项工作能为未来推动高电压LCO的发展和应用提供参考。

Nowadays, the development of high-voltage LiCoO₂ (lithium cobalt oxide, LCO) cathodes has attracted the widespread attention from both the academic and industry fields. Among the multiple concerns, researches on the surface issues would provide the most effective performance optimization pathway for the synthesis of high-voltage LCO. In this work, the issues of high-voltage LCO, including the phase transitions and crack formation, the oxygen redox related issues and side reactions, as well as the surface structure degradation, have been systematically reviewed. Then, we further clarify the surface modulations, and the interplay between the surface modulation and electrolyte tuning. Finally, we propose our prospects for developing the more advanced LCO cathodes, including the low-cost and high-quality manufacturing, designing suitable LCO cathodes in some extreme conditions (such as high-temperature, high-rate charging, low temperature, etc.), and achieving stabilized capacity release of about 220 mAh·g^-1 of LCO, etc. We hope that this work can serve as a reference to promote the development and application of high-voltage LCO in future.