Recent achievements of free‐standing material and interface optimization in high‐energy‐density flexible lithium batteries

Abstract

Lithium-based batteries are the most potential state-of-the-art energy storage device for flexible electronics. The flexible lithium batteries have the advantages of high energy density, robust mechanical durability, and stable power output even under dynamic deformation. Among them, the synergies of flexible free-standing electrodes, solid electrolytes, and electrode-electrolyte interfaces are crucial to achieving the goal of high energy density and safety performance for flexible lithium batteries.Therefore, a thorough understanding of the interface formation mechanism and influencing factors is crucial for the design of flexible electrodes and solid electrolytes. In this review, the interface challenges in flexible lithium-based batteries including interface formation, electrodeselectrolyte interface, and interparticle interface characteristics are presented. Then, strategies of interface optimization are summarized and discussed. Following this, the interface of flexible lithium-based batteries with novel architecture is introduced, including the interface between each component and unit of the battery. Finally, the perspectives for the future development of flexible lithium-based batteries are also given.

Interface Engineering on Constructing Physical and Chemical Stable Solid‐State Electrolyte Toward Practical Lithium Batteries

“…Therefore, solid-state lithium batteries (SSLBs) using solid-state electrolyte (SSE) have attracted lots of interest due to their higher energy density and safety compare to traditional LIBs. [12][13][14][15][16] Continuous efforts have been devoted to developing high-energy-density SSLBs and revealing their fundamental electrochemistry.…”

Three-Dimensional Carbon Nanomaterial/Aluminum Oxide/Aluminum Composite Current Collectors for Flexible Supercapacitors

“…The current collectors for FSSCs need to meet the following requirements: (i) good electrical conductivity, (ii) chemically stable and not reacting with active materials, adhesives, and electrolytes, (iii) good connection with electrode materials, (iv) good flexibility, and (v) cost-effective and easy to mass produce. − Aluminum (Al) foil is one of the most commonly used current collectors for energy storage devices, especially in supercapacitors and sodium-ion batteries, due to its flexibility, low price, and lightweight. However, the biggest problem with Al foil current collectors is the poor connection between the Al foil and active materials, which can lead to a decrease in the stability of the supercapacitor.…”

Multifunctional Silane Additive Enhances Inorganic–Organic Compatibility with F‐rich Nature of Interphase to Support High‐Voltage LiNi0.5Mn1.5O4//graphite Pouch Cells

“…Moreover, the HF generated by electrolyte decomposition will corrode the positive electrode and lead to the dissolution of transition metal, which in turn will catalyze further electrolyte decomposition as well as deteriorate the solid electrolyte interphase (SEI) on the anode surface. [21][22][23][24][25][26] In the practical full batteries, except for considering the destruction of the cathode material and the violent decomposition of the electrolyte, the degradation of the anode is also an important factor that directly affecting the battery performance. Therefore, the protection of anode should be taken into consideration while improving the electrochemical properties of high voltage cathode.…”

“…Moreover, the HF generated by electrolyte decomposition will corrode the positive electrode and lead to the dissolution of transition metal, which in turn will catalyze further electrolyte decomposition as well as deteriorate the solid electrolyte interphase (SEI) on the anode surface. [ 21–26 ]…”