Carbon materials for smart batteries

Abstract

Smart batteries play a key role in upgrading energy storage systems. However, they require a well-balanced integration of material structure, functional properties, and electrochemical performance, and their development is limited by conventional material systems in terms of energy density, response time, and functional integration. Carbon materials have emerged as a key solution for overcoming these problems due to their structural adjustability and multifunctional compatibility. Strategies for improving their electrochemical performance by changing the pore structure and interlayer spacing, as well as chemical functionalization, and composite design are analyzed, and their impact on improving the specific capacity and cycling stability of batteries is demonstrated. The unique advantages of carbon materials in realizing smart functions such as power supply, real-time monitoring and energy management in smart batteries are also discussed. Based on current progress in related fields, the prospects for the use of carbon materials in smart batteries are evaluated.

1. Introduction

The development of smart batteries and material innovation has always been closely intertwined[1–2]. Since Intel and Duracell proposed the concept of smart battery system (SBS) in 1995, high-performance batteries and their associated control and management systems have gradually become a critical component of modern power technology[3–4]. At present, driven by smart requirements such as real-time perception, dynamic response and self-determination[5], the traditional battery material system also needs to be optimized and upgraded to meet the comprehensive requirements of smart batteries for high energy density[6–7], rapid response[8–9], environmental adaptability[10–11] and functional integration[12–13]. Under this context, carbon materials, with their unique atomic structure adjustability[14–15] and multi-dimensional functional compatibility[16–17], are playing an increasingly important role in the application of smart batteries (Fig. 1).

The basic architecture of a smart battery retains the core components of conventional secondary batteries, including anode, cathode, electrolyte and separator, through which reversible ion transport and energy storage/release processes are facilitated[18]. The typical structural composition of a smart battery is illustrated in Fig. 2. Smart batteries are integrated with a variety of intelligent functional modules, endowing them with advanced capabilities such as power supply, sensing, self-protection, and thermal management[19]. As illustrated in Fig. 2, flexible sensors are incorporated into the battery to enable real-time monitoring of environmental stimuli, including external stress, temperature, and pressure. The sensed data can be wirelessly transmitted to mobile devices or AI terminals, thereby enabling dynamic perception and closed-loop feedback control[20]. In addition, phase change materials or thermo-responsive polymers are embedded within the battery, which can actively release flame retardants and block ion transport pathways under conditions of overheating or malfunction, thus achieving effective thermal management and enhanced safety protection[21]. Furthermore, self-healing materials with dynamic bonding characteristics are employed, allowing the battery structure to autonomously repair mechanical damage (e.g., cracking), thereby extending the operational lifespan of the device[22]. Such integration of structure and function transforms the smart battery from a conventional energy storage device into an intelligent energy system with the capabilities of perception, feedback, and self-regulation[23].