Xi 'an jiaotong university in frontier science and technology institute, professor li kui-wai team and the Chinese academy of sciences researcher at the institute of yongsheng hu group cooperation study found that the traditional studies of hard carbon negative half cell method, badly underestimated the hard carbon negative performance, and evaluate the performance of hard carbon improvement scheme is proposed.
The results of this study were published in the journal nano energy.
With the rapid development of new energy vehicles and grid energy storage, lithium resources tend to be tight and will further aggravate the shortage.
Sodium ion batteries are ideal alternatives, but due to the lack of suitable anode materials, the multiplier performance and cyclic stability are far from the requirements.
Hard carbon negative materials have high capacity and high efficiency of the first week, but they are considered to have poor multiplier performance and cyclic stability.
Researchers in the experiment using macadamia nut shell as precursor, MHC hard carbon high-temperature pyrolysis, can provide the specific capacity of 314 mah/g, as well as the efficiency of 91.4% in the first week, is now reported the highest efficiency in the first week of hard carbon materials.
With the NCNFM positive electrode material, the multiplier performance is far higher than that of its semi-battery, and can circulate for 1300 weeks at 1C ratio. The capacity retention rate is over 70%.
The results turn the academic performance of sodium ion battery hard carbon negative rate and cycle stability, to sodium ion batteries will be relatively large impact on the development direction of the future, and will promote the sodium ion batteries from research stage to industrialization.