METHOD FOR INCREASING SAFETY OF LITHIUM-ION BATTERIES

Method for increasing safety of lithium-ion batteries includes: (A), heating heavy oil to obtain a raw coke; (B), heating the raw coke to 850-900°C for at least 4 hours at heating rate of 3-5°C/min to obtain a carbon-containing material; (C), grinding and grading the carbon-containing material, taking out a carbon-containing powder with D50 of 8-12µm and D10 of 1-8µm; (D), heating the carbon-containing powder to 1030-1220°C for at least 4 hours at heating rate of 3-10°C/min to obtain a carbon material powder; (E), after adding pitch accounting for at least 4wt% of the carbon material powder to the carbon material powder, heating the carbon material powder to 1030-1220°C for at least 5 hours at heating rate of 0.90-1.25°C/min, to obtain soft carbon modified by pitch; (F), adding the soft carbon to graphite as an anode material, and a weight ratio of the soft carbon to the graphite is 1: 1-39.