With the advent of flexible electronics, lithium‐ion batteries have become a key component of high performance energy storage systems. Thus, considerable effort is made to keep up with the development of flexible lithium‐ion batteries. To date, many researchers have studied newly designed batteries with flexibility, however, there are several significant challenges that need to be overcome, such as degradation of electrodes under external load, poor battery performance, and complicated cell preparation procedures. In addition, an in‐depth understanding of the current challenges for flexible batteries is rarely addressed in a systematical and practical way. Herein, recent progress and current issues of flexible lithium‐ion batteries in terms of battery materials and cell designs are reviewed. A critical overview of important issues and challenges for the practical application of flexible lithium‐ion batteries is also provided. Finally, the strategies are discussed to overcome current limitations of the practical use of flexible lithium‐based batteries, providing a direction for future research.

中文翻译：

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柔性锂离子电池在实际应用中面临的问题和挑战

随着柔性电子产品的出现，锂离子电池已成为高性能储能系统的关键组成部分。因此，为跟上柔性锂离子电池的发展付出了巨大的努力。迄今为止，许多研究人员已经研究了具有灵活性的新设计的电池，但是，还需要克服一些重大挑战，例如在外部负载下电极的降解，不良的电池性能以及复杂的电池制备程序。此外，很少以系统和实际的方式来深入了解柔性电池的当前挑战。本文就柔性锂离子电池在电池材料和电池设计方面的最新进展和当前问题进行了综述。还提供了有关柔性锂离子电池实际应用中的重要问题和挑战的重要概述。最后，讨论了克服柔性锂基电池实际使用中当前局限性的策略，为将来的研究提供了方向。