Trace Mo Doping in NaMnO 2 Cathode Materials for High‐Capacity Sodium‐Ion Batteries
Jijie Wang, Yuhua Lin, Yongqiang Shen, Yanhong Xiang, Xianwen WuABSTRACT
The ever‐growing demand for recyclable and clean energy stimulates research on batteries. Sodium‐ion batteries are promising candidates for their rocking‐chair mechanism and high reserves. NaMnO 2 has been drawing attention owing to its environmentally friendly ingredients and outstanding cycling performance. However, insufficient sodium storage sites and unsatisfying specific capacity hinder its practical application and commercialization process. The common methods to solve these problems include doping and coating, but these lead to price increase and capacity loss. To address this, NaMn 0.99 Mo 0.01 O 2 cathode materials are synthesized with a simple solution‐gel method through doping a trace amount of Mo. Based on sufficient experimental evidence, Mo‐doping significantly improves SIB's reversible specific capacity, demonstrating great potential in promoting energy intensity. For instance, NaMn 0.99 Mo 0.01 O 2 shows an average working voltage of 3.0 V and an initial capacity of 183.7 mAh g −1 at 0.2 C. Especially, it has a remarkable specific capacity of 138.1 mAh g −1 and distinct cycling stability of 84.7% capacity retention over 100 cycles even at 1 C. This work provides a perspective on Mo doping and a promising choice for constructing high‐performance commercial batteries.