锂离子电池快充石墨负极研究与应用

丁晓博, 黄倩晖, 熊训辉

Research and Application of Fast-Charging Graphite Anodes for Lithium-Ion Batteries

Xiaobo Ding, Qianhui Huang, Xunhui Xiong

表1 文献报道的石墨的改性策略和电化学性能

Table 1 modification strategies and electrochemical properties of graphite in other reports.

Modification strategy Electrochemical performance (capacity/corresponding current density) Reference Edge-plane activated graphite coated by an amorphous Si nanolayer 100 mAh?g?1/1 A?g?1 200 mAh?g?1/0.67 A?g?1 21 The electrolyte consists of 1.0 M lithium trifluoromethanesulfonate (LiTF) in DEGDME ~100 mAh?g?1/1 A?g?1 30 The electrolyte consists of a superconcentrated 4.5 M LiFSA/AN solution ~278 mAh?g?1/1.86 A?g?1 31 LTO coated graphite ~143 mAh?g?1/2.14 A?g?1 32 PEGPE coated natural graphite 298 mAh?g?1/0.186 A?g?1 26 Graphite particles oriented perpendicularly to the current collector 83 mAh?g?1/0.74 A?g?1 33 Silicon-nanolayer-embedded graphite/carbon composite ~260 mAh?g?1/1.86 A?g?1 34 Zirconia film coated graphite ~370 mAh?g?1/1.12 A?g?1 35 Superconcentrated (1 : 1.1) LiFSA/DMC electrolytes ~243 mAh?g?1/1.86 A?g?1 36 The electrolyte consists of 3.6 M LiFSA in DME ~108 mAh?g?1/1.86 A?g?1 ~250 mAh?g?1/0.74 A?g?1 37 Using a combination of lithium difluorophosphate (LiDFP) and vinylene carbonate (VC) as electrolyte additives 250 mAh?g?1/1.8 A?g?1 38 Amorphous carbon coating on the graphite surface 263 mAh?g?1/1.86 A?g?1 39 Adding LiNO3 into the graphite electrode 291.7 mAh?g?1/0.68 A?g?1 40 A rapid cell internal heating step 80% SOC acquired in 15 min at 50 ℃ 41 An asymmetric temperature modulation method 6C charge to 80% SOC 42