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) XRD patterns; (b) Raman spectra of PNSHC-T samples; (c) evolution of d₀₀₂ distance and the radio of I D / I G ; (d) element proportion in PNSHC-T samples as a function of temperature.