A kind of ternary cathode material and preparation method thereof
A positive electrode material, graphene technology, applied in the field of ternary positive electrode materials and its preparation, can solve the problems of cycle performance decline, powder resistivity increase, etc., achieve the effect of reducing powder resistivity, obvious effect, and improving cycle performance
Active Publication Date: 2022-03-29
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to overcome the technical defects that the powder resistivity increases and the cycle performance decreases during the preparation and modification process of the ternary positive electrode material, and to provide a ternary positive electrode material and its preparation method
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Embodiment 1
[0033] The ternary cathode material described in Example 1 and Comparative Example 1 is Li n Ni 1-x-y co x mn y o 2 , wherein 0
[0034] The size of the graphene oxide described in Example 1 is 0.2 μm, the number of layers is 3 layers, C:O=1.9, and the concentration of the graphene oxide solution is 2 g / L.
[0035] Example 1
[0036] A preparation method of a ternary cathode material, comprising the steps of:
[0037] (1) Add ternary positive electrode material and deionized water according to the ratio of material to water ratio of 2:1 in the washing process, and add 0.0016% (based on graphene oxide weight, the mass ratio to ternary positive electrode material is 0.0016%) graphite oxide Graphene solution, stirred in water washing equipment at a stirring speed of 80r / min for 30min, so that graphene oxide is uniformly and fully coated on the surface of the ternary positive electrode material;
[0038] (2) After the ternary po...
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Abstract
The invention discloses a ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) Washing: adding water to wash the ternary positive electrode material, adding a graphene oxide solution and stirring to obtain the washed ternary positive electrode material. A ternary positive electrode material coated with graphene oxide; (2) drying: the ternary positive electrode material coated with graphene oxide is filtered and dried to obtain a ternary positive electrode material coated with graphene oxide after drying; ( 3) Sintering: sintering the dried graphene oxide-coated ternary cathode material to obtain a graphene-coated ternary cathode material. The present invention not only reduces the powder resistivity of the ternary positive electrode material, but also reduces the powder resistivity of the ternary positive electrode material by coating the graphene oxide during the water washing process of the ternary positive electrode material and generating a high-conductivity conductive layer on the surface of the ternary positive electrode material through the subsequent high-temperature sintering process. Moreover, the cycle performance of the ternary cathode material is improved.
Description
technical field [0001] The invention relates to the technical field of modification of ternary positive electrode materials, in particular to a ternary positive electrode material and a preparation method thereof. Background technique [0002] Compared with cathode materials such as lithium iron phosphate, high-nickel ternary cathode materials have the advantages of high specific capacity, high working voltage, and high ion and electronic conductivity. With the continuous improvement of energy density requirements of subsidy policies, the demand for ternary cathode materials by battery cell enterprises is increasing day by day. [0003] The improvement of the capacity of the ternary cathode material is due to the increase of Ni content in the material, but the consequences are the increase of pH, the increase of gas production of the charged core, and the decrease of high temperature and normal temperature cycle performance. [0004] In order to improve a series of problems...
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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 时志翔于建谢恒斌金国山袁徐俊佘圣贤
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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