Zhang Junjin, Shi Qitao, Lu Chen, Liu Xiangqi, Wang Jiaqi, Zhang Cheng, Wang Zhipeng, Li Luwen, Bachmatiuk Alicja, Shen Yanbin, Yang Ruizhi, Rümmeli Mark H
Soochow Institute for Energy and Materials Innovation, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, Soochow University, Suzhou 215006, China.
i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, China.
ACS Appl Energy Mater. 2025 Jun 9;8(12):8277-8287. doi: 10.1021/acsaem.5c00794. eCollection 2025 Jun 23.
Graphite anodes have approached their theoretical specific capacity of 372 mA h g, which becomes an obstacle for further increasing the energy density of commercial lithium-ion batteries. Various strategies have been proposed to enhance the energy density of graphite-based full batteries, such as decreasing the usage of inactive binders and conductive additives and exploring graphite/SiO composite anodes. Nevertheless, the anodes cannot balance energy density, power density, and cycling stability. In this study, we designed an all-electrochem-active graphite electrode by manipulating the Li activity of the inactive components to improve the energy density of the entire electrode. In our study, colloidal two-dimensional titanium carbide nanosheets (MXene) were employed as binders, and carbon-coated titanium dioxide nanoparticles with oxygen defects (TiO @C) acted as conductive additives in the electrode configurations. Both MXene and TiO @C can function as active materials to store lithium ions by reversible insertion and extraction with little electrochemical degradation. As a result, the all-electrochem-active graphite electrodes demonstrated a superior specific capacity of 394 mA h g at a current density of 0.2C after 300 cycles. This concept of all-electrochem-active electrodes is anticipated to inspire future research on high-energy-density batteries by activating the Li affinities of binders and conductive additives.
石墨阳极已接近其372 mA h g的理论比容量，这成为进一步提高商用锂离子电池能量密度的障碍。人们提出了各种策略来提高基于石墨的全电池的能量密度，例如减少非活性粘结剂和导电添加剂的用量以及探索石墨/二氧化硅复合阳极。然而，这些阳极无法平衡能量密度、功率密度和循环稳定性。在本研究中，我们通过控制非活性成分的锂活性来设计一种全电化学活性石墨电极，以提高整个电极的能量密度。在我们的研究中，胶体二维碳化钛纳米片（MXene）被用作粘结剂，具有氧缺陷的碳包覆二氧化钛纳米颗粒（TiO @C）在电极结构中充当导电添加剂。MXene和TiO @C都可以作为活性材料，通过可逆的嵌入和脱嵌来存储锂离子，且几乎没有电化学降解。结果，全电化学活性石墨电极在0.2C的电流密度下经过300次循环后表现出394 mA h g的优异比容量。全电化学活性电极的这一概念有望通过激活粘结剂和导电添加剂的锂亲和力来激发未来对高能量密度电池的研究。
