Against the backdrop of global energy transformation and sustainable development, lithium-ion batteries, as the core of high-efficiency energy storage technology, have become the focus of research. As a key component of lithium-ion batteries, the battery separator directly affects the charging and discharging efficiency, cycle life and safety of the battery. Although traditional polyolefin separators are widely used, their poor thermal stability, insufficient electrolyte wetting and environmental unfriendly problems are becoming increasingly prominent. Nanocellulose is a natural, renewable, biodegradable high-performance material. With its high ionic conductivity, excellent thermal stability and mechanical strength, Nanocellulose is becoming a hot topic in the field of battery separators. This article will conduct in-depth discussion on the application advantages of nanocellulose in battery separators, the latest research progress and future development directions. 1. The core role and challenge of battery separator 1.1 The core function of battery separator The battery separator is between the positive and negative electrodes in lithium-ion batteries
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