Anode composite material particle of lithium ion battery and preparation method thereof

Abstract

The invention relates to an anode composite material particle of a lithium ion battery and a preparation method thereof. The composite material particle comprises anode active substance particles and an aluminium phosphate layer cladded thereon. The invention also relates to the preparation method of the anode composite material particle of a lithium ion battery. The method comprises steps of: providing an aluminium nitrate solution; adding anode active substance particles to be cladded in the aluminium nitrate solution, controlling an addition of the anode active substance and forming a mixture; adding a phosphate solution into the mixture for reaction to form an aluminium phosphate layer on the anode active substance particle surfaces; and carrying out heat treatment on anode active substance particle with the aluminium phosphate layer to obtain the anode composite material particles.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode composite material particle and a preparation method thereof, in particular to a lithium ion battery positive electrode composite material particle with aluminum phosphate and a preparation method thereof. Background technique [0002] Coating the particle surface of the positive electrode active material of the lithium ion battery with other materials is a common method for modifying the positive electrode active material in the prior art. For example, coating a layer of carbon on the surface of lithium iron phosphate particles can effectively solve the problem of low conductivity of lithium iron phosphate, so that lithium iron phosphate coated with a carbon layer has better conductivity. In addition, the prior art has shown that coating aluminum phosphate on the surface of lithium cobalt oxide or other positive electrode active material particles can improve the thermal stability of th...

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Problems solved by technology

Therefore, the aluminum phosphate coating layer formed on the surface of the positive electrode active material by the above method is not uniform enough, and it is impossible to ensure that the surface of each positive electrode active material can be uniformly coated with a layer of aluminum phosphate, so that the lithium ion battery using the positive electrode active material The cycle performance is not good, making this method difficult for large-scale industrial application

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