Pseudosolvent Guiding Ultralight V<sub>2</sub>CT<i><sub>x</sub></i>/Bacterial Cellulose with Fast Ion Diffusion Paths for High‐Rate and High‐Capacity Lithium Metal Anodes
Zhiwei Chen, Meng He, Xiao Zhang, J. Z. Yu, Jianguang Xu, Jinshan Wang, Juhua Luo, Chi Chen, Yuxi Song, Xin‐Bing Cheng, Wei Yao
Abstract
Abstract Practical application of Li metal anodes (LMAs) is restricted by growth of Li dendrites. Achieving uniform Li deposition with high practically available specific capacity is vital to obtain advanced LMAs. Herein, an ultralight V 2 CT x /bacterial cellulose (U‐V 2 CT x /BC) foam with a volume density of 0.039 g cm −3 is guided by tertiary butanol to avoid restacking of both V 2 CT x and BC. The lithiophilic functional groups of V 2 CT x and BC synergistically induce the uniform Li nucleation. The loose stacking structure of the U‐V 2 CT x /BC provides 3D ion channels for accelerating Li + diffusion, homogeneous Li + flux, as well as enough lithiophilic sites and interspace for Li deposition. As a result, the U‐V 2 CT x /BC@Li exhibits superior stability of 2800 h at 5 mAh cm −2 and 5 mA cm −2 with an ultrahigh practically available specific capacity of 2040 mAh g −1 . Furthermore, full‐cells paired with LiFePO 4 cathodes possess a remarkable capacity retention of 80.7% after 800 cycles at 1 C. Even at harsh conditions, the U‐V 2 CT x /BC@Li||LiFePO 4 full‐cells can also run 100 cycles at 0.3 C with a capacity retention of 84.9%. This work sheds light on both surface engineering and multiscale architecture design for the advanced LMAs with high practically available specific capacity.