Conductive binary Li borate glass coating for improved Ni-rich positive electrode in sulfide-based all-solid-state Li batteries

Jiayao Luo, Bangjun Guo, Nana Li, Qianjin Huang, Jingjing Wang, Yongzhu Fu, Linan Jia, Xi Zhang, Junbo Hou, Jinhui Zhu () and Xiaodong Zhuang ()
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Jiayao Luo: Shanghai Jiao Tong University
Bangjun Guo: Shanghai Jiao Tong University
Nana Li: Shanghai Jiao Tong University
Qianjin Huang: Shanghai Jiao Tong University
Jingjing Wang: Shanghai Jiao Tong University
Yongzhu Fu: Zhengzhou University
Linan Jia: Shanghai Jiao Tong University
Xi Zhang: Shanghai Jiao Tong University
Junbo Hou: Power System Resources Environmental Technology Co. Ltd
Jinhui Zhu: Shanghai Jiao Tong University
Xiaodong Zhuang: Shanghai Jiao Tong University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract Coating Ni-rich layered oxide positive electrodes is essential to improve their electrochemical performance in sulfide-based all-solid-state Li batteries, but achieving cost-effective, high-performance positive electrodes remains challenging. In this work, we apply a thin (~3 nm) conductive binary Li borate glass coating (0.5Li2O·0.5B2O3) onto single-crystal LiNi0.8Co0.1Mn0.1O2 using a simple dry process and heating. This coated positive electrode delivers 209 mAh g−1 specific capacity at a specific current of 20 mA g−1 with 79.7% initial Coulombic efficiency, retains 87.8% capacity after 1000 cycles at a specific current of 200 mA g−1, and achieves 14.6 mAh cm−2 areal capacity. Pouch cells with this positive electrode reach 383 Wh kg−1 specific energy, and sustain 300 cycles at a specific current of 66.67 mA g−1. Various characterizations reveal that this coating can enhance Li-ion transport, stabilize the positive electrode lattice, and strengthen the interface between positive electrode and sulfide electrolyte. Here we show that conductive glass coatings enable high-voltage positive electrodes with high stability and specific energy in all-solid-state batteries.

Date: 2025
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DOI: 10.1038/s41467-025-64532-6

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