| abstract |
The invention discloses a kind of lithium ion battery and preparation method thereof, the preparation method includes：Electrolyte, positive electrode and negative material are assembled；Wherein, electrolyte includes：Lithium hexafluoro phosphate, ethyl propionate, LiBF4, methyl ethyl carbonate, sodium chloride, potassium chloride, nano silicon dioxide, additive and deionized water；Positive electrode includes modified phosphate iron lithium, fusion vinyl fluoride and carbon black；Negative material includes graphite, butadiene-styrene rubber, graphite and sodium carboxymethylcellulose；So that lithium ion battery effectively discharges under big multiplying power current conditions under fast charging and discharging and low temperature environment. |