Hard carbons derived from pine nut shells as anode materials for Na-ion batteries

Guo Hao¹, Sun Kai^{1, †}, Lu Yaxiang^{2, 3, ‡}, Wang Hongliang¹, Ma Xiaobai¹, Li Zhengyao¹, Hu Yong-Sheng^{2, 3}, Chen Dongfeng^{1, §}

Rate capabilities of (a) PNSHC-1000, (b) PNSHC-1200, (c) PNSHC-1400, and (d) PNSHC-1600 electrodes.