Poria cocos waste-derived cellulose-based biochar as advanced porous anode material for lithium-ion batteries

Abstract

The biochar conversed from waste has shown excellent performance as anode material for lithium-ion batteries (LIBs), and is considered to be one of the effective means to solve environmental pollution and energy shortage. However, the selection and design of waste are still important challenge due to its diverse intrinsic structure and internal complex compositions. Herein, a porous biochar anode material based on Poria cocos waste rich in cellulose was prepared by simple pyrolysis for the first time. The biochar exhibits abundant porous structure with a high specific surface area of 2290.6 m² g−1 according tothe results of physical characterization. Furthermore, the biochar as anode material of LIBs delivers an impressive initial reversible specific capacity of 1139.64 mAh g−1 at 100 mA g−1, outstanding rate capability, and amazing cycle stability with a capacity of 806.63 mAh g−1 after 300 cycles. Even at 1000 mA g−1, the biochar still exhibits excellent cycling stability with a capability of 227.85 mAh g−1 after 300 cycles. Particularly, the biochar anode can still exhibit an excellent electrochemical performance even at 60 °C. Therefore, the biochar based on Poria cocos waste provides a sustainable low-cost route for producing advanced high-capacity anode materials for LIBs.