The invention provides an
electrolyte, a preparation method thereof and a
lithium ion battery, and relates to the field of
lithium ion batteries. According to the
electrolyte, carbon-coated ferroferric
oxide particles are introduced to serve as a magnetic additive, the carbon-coated ferroferric
oxide particles are mainly composed of ferroferric
oxide nano-particles and
porous carbon coating layers coating the surfaces of the ferroferric oxide nano-particles, and the structure enables the ferroferric oxide nano-particles to have good
dispersion stability in the
electrolyte; and when the electrolyte is under the action of an external
magnetic field, the carbon-coated ferroferric oxide particles can generate specific response and movement, and are orderly arranged in a certain direction within milliseconds to form a
chain structure and a
linear channel, so that the
diffusion of
lithium ions in the electrolyte is changed from disordered state to ordered state, the
transmission rate of the lithium ions is improved, and meanwhile, the performance of the
lithium ion battery is improved. And under the
magnetic flux superposition effect of the magnetic particles, Li < + > cuts magnetic induction lines, so that the temperature of the electrolyte is increased, and the
fast charging performance is further improved. The invention also provides a
lithium ion battery which comprises the electrolyte.