Anode composite material particle of lithium ion battery and preparation method thereof
A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery cathode composite material particles and its preparation, can solve problems such as difficulty in large-scale industrial application, poor cycle performance of lithium-ion batteries, and uneven coating of aluminum phosphate. , to achieve the effect of good electrochemical performance
Active Publication Date: 2012-02-08
TSINGHUA UNIV +1
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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 materi
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[0038] In this embodiment, the above-mentioned method is used to prepare the positive electrode composite material particles by coating the positive electrode active material particles with aluminum phosphate, and the positive electrode composite material particles are applied to a lithium-ion battery for performance testing. The positive electrode active material particles may be lithium cobalt oxide particles or doped lithium cobalt oxide particles, and this embodiment is lithium cobalt oxide particles. The aluminum phosphate-lithium cobalt oxide composite material particles include lithium cobalt oxide particles and an aluminum phosphate layer coated on the surface of the lithium cobalt oxide particles.
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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...
Claims
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Login to view more IPC IPC(8): H01M4/136H01M4/58H01M4/1397
CPCY02E60/10
Inventor 何向明王丹姜长印黄贤坤高剑李建军
Owner TSINGHUA UNIV
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