A High‐Voltage and Ultralong‐Life Sodium Full Cell for Stationary Energy Storage |
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| Authors: | Shaohua Guo Dr Pan Liu Dr Yang Sun Kai Zhu Dr Jin Yi Prof Mingwei Chen Prof Masayoshi Ishida Prof Haoshen Zhou |
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| Institution: | 1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1‐1‐1, Tsukuba 305‐8568 (Japan);2. Graduate School of System and Information Engineering, University of Tsukuba, Tennoudai 1‐1‐1, Tsukuba 305‐8573 (Japan);3. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8577 (Japan);4. National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing 210093 (China) |
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| Abstract: | Recently, there has been great interest in developing advanced sodium‐ion batteries for large‐scale application. Most efforts have concentrated on the search for high‐performance electrode materials only in sodium half‐cells. Research on sodium full cells for practical application has encountered many problems, such as insufficient cycles with rapid capacity decay, low safety, and low operating voltage. Herein, we present a layered P2‐Na0.66Ni0.17Co0.17Ti0.66O2, as both an anode (ca. 0.69 V versus Na+/Na) and as a high‐voltage cathode (ca. 3.74 V versus Na+/Na). The full cell based on this bipolar electrode exhibits well‐defined voltage plateaus near 3.10 V, which is the highest average voltage in the symmetric cells. It also shows the longest cycle life (75.9 % capacity retention after 1000 cycles) in all sodium full cells, a usable capacity of 92 mAh g?1, and superior rate capability (65 mAh g?1 at a high rate of 2C). |
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| Keywords: | batteries electrochemistry sodium stationary energy storage ultralong cycle life |
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