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, §}

(a) and (b) SEM pictures of PNSHC-1400. (c)–(f) HRTEM images of PNSHC-1000, PNSHC-1200, PNSHC-1400, and PNSHC-1600, respectively.