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Spherical ternary composite positive electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery, ternary composite technology, applied in battery electrodes, positive electrodes, electrical components, etc., can solve problems such as poor ionic conductivity and electronic conductivity, inability to withstand high current charge and discharge, and unsatisfactory rate performance. Achieve the effect of improving rate performance, slowing down the irreversible reduction of capacity, and improving lithium ion conductivity

Inactive Publication Date: 2021-02-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems that the nickel-cobalt-manganese ternary positive electrode material produced by the traditional process has poor ion conductivity and electronic conductivity, cannot withstand the charge and discharge of large current, and the rate performance cannot be satisfied, the present invention provides a high electronic conductivity, A spherical ternary composite cathode material for lithium-ion batteries that maintains a high cycle life without reducing the initial capacity

Method used

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  • Spherical ternary composite positive electrode material of lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] (1) After ball milling the commercial nickel cobalt lithium manganese oxide precursor material and lithium hydroxide, sintering at high temperature to obtain NCM powder balls with an average particle size of 10 μm; the commercial nickel cobalt lithium manganese oxide precursor material includes Components in the following molar percentages: Ni content is 80 mol%, Co content is 12 mol%, Mn content is 8 mol%;

[0033] (2) Lithium hydroxide, lanthanum chloride, and zirconium nitrate are added to deionized water to prepare a LLZO precursor solution with a concentration of 15mol / ml;

[0034] (3) Add the NCM powder balls obtained in step (1) to the LLZO precursor solution obtained in step (2), stir evenly at 48r / min, control the temperature at 58°C during the stirring process, dry to obtain solid powder, 700°C Calcined at high temperature to obtain mixed powder of NCM@LLZO;

[0035] (4) Add graphene to the mixed powder of NCM@LLZO obtained in step (3), and mix evenly to obta...

Embodiment 2

[0037] (1) After the commercial nickel cobalt lithium manganese oxide precursor and lithium carbonate are ball milled, they are sintered at high temperature to obtain NCM powder balls with an average particle size of 8 μm; the commercial nickel cobalt lithium manganese oxide precursor material includes the following molar Components by percentage: Ni content is 85mol%, Co content is 7mol%, Mn content is 8mol%;

[0038] (2) Lithium carbonate, lanthanum chloride, and zirconium nitrate are added in ethanol, and the preparation concentration is the LLZO precursor solution of 30mol / ml;

[0039] (3) Add the NCM powder balls obtained in step (1) to the LLZO precursor solution obtained in step (2), stir evenly at 45r / min, control the temperature at 55°C during the stirring process, dry to obtain solid powder, 55°C Calcined at high temperature to obtain mixed powder of NCM@LLZO;

[0040] (4) Add graphene to the mixed powder of NCM@LLZO obtained in step (3), and mix evenly to obtain a ...

Embodiment 3

[0042] (1) After ball milling the commercialized nickel-cobalt lithium manganese oxide precursor and anhydrous lithium acetate, sintering at high temperature to obtain NCM powder balls with an average particle size of 3 μm; the commercial nickel-cobalt lithium manganese oxide precursor material includes Components in the following molar percentages: Ni content is 83mol%, Co content is 10mol%, Mn content is 5mol%;

[0043] (2) adding anhydrous lithium acetate, lanthanum chloride, and zirconium sulfate into a mixed solvent of deionized water and ethanol (volume ratio 1:1) to prepare a LLZO precursor solution with a concentration of 5mol / ml;

[0044] (3) Add the NCM powder ball obtained in step (1) to the LLZO precursor solution obtained in step (2), stir evenly at 50r / min, control the temperature at 60°C during the stirring process, dry to obtain a solid powder, 800°C Calcined at high temperature to obtain mixed powder of NCM@LLZO;

[0045](4) Add graphene to the mixed powder o...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a spherical ternary composite positive electrode material of a lithium ion battery and a preparation method thereof. The spherical ternary composite positive electrode material of the lithium ion battery is prepared from the following components in percentage by mass: 80-90% of NCM powder balls, 5-10% of solidelectrolyte LLZO and the balance of graphene. On the basis of an NCM ternary material pure sample, a layer of graphene is coated again, so that the electronic conductivity of the material can be improved, the rate capability of the material is improved, and meanwhile, the flexible graphene can slow down irreversible reduction of capacity caused by mentioned deformation in the charging and discharging process of the NCM, and the cycle performance of the material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a spherical ternary composite cathode material for lithium ion batteries and a preparation method thereof. Background technique [0002] At present, the ternary composite positive electrode material with the same molar ratio of nickel, cobalt and manganese has received widespread attention. Due to its high specific capacity, good cycle performance and good thermal stability, and the price of manganese and nickel is lower than that of cobalt, The cost of materials can be greatly reduced, and it is an ideal cathode material for lithium ion batteries. [0003] At present, the research on nickel-cobalt-manganese ternary cathode materials (NCM ternary materials) mainly focuses on the synthesis of materials and the relationship between electrochemical performance and structure. In actual batteries, the physical characteristics of the positive electrode material particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赵焱樟陈瑶许梦清
Owner WANXIANG 123 CO LTD
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