Large-crystal ternary positive electrode material of lithium ion battery and preparation method of large-crystal ternary positive electrode material

A lithium-ion battery and cathode material technology, applied in the field of materials, can solve the problems of high residual alkali on the surface of materials, poor thermal stability, and poor cycle stability, and achieve good high-temperature cycle and storage performance, strong applicability, and good rate performance. Effect

Inactive Publication Date: 2018-06-22
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many problems to be solved in the practical application of ternary cathode materials.
Including: mixed cations; poor cycle stability; high residual alkali on the surface of the material; poor thermal stability, etc.

Method used

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  • Large-crystal ternary positive electrode material of lithium ion battery and preparation method of large-crystal ternary positive electrode material
  • Large-crystal ternary positive electrode material of lithium ion battery and preparation method of large-crystal ternary positive electrode material
  • Large-crystal ternary positive electrode material of lithium ion battery and preparation method of large-crystal ternary positive electrode material

Examples

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preparation example Construction

[0033] The preparation method of the lithium-ion battery large-grain body ternary positive electrode material provided by the invention, such as figure 1 As shown, it mainly includes the following steps:

[0034] (1) Mix the nickel-cobalt-manganese precursor and the lithium source according to Li(mol) / NiCoMn(mol)=1.00-1.20, sinter at 400°C-1050°C for 5-12h, cool to room temperature and crush to obtain single crystal particles ;

[0035] Specifically, the nickel-cobalt-manganese precursor may include: Ni x co y mn z (OH) 2 、Ni x co y mnz CO 3 、Ni x co y mn z O, Ni x co y mn z SO 4 Any one or more of them, where x+y+z=1;

[0036] Specifically, the lithium source may include: lithium carbonate, lithium hydroxide, lithium oxide, lithium peroxide, lithium superoxide, lithium nitrate, lithium nitrite, lithium sulfate, lithium sulfite, lithium thiosulfate, lithium silicate, chlorine Any one or more of lithium chloride, lithium bromide, lithium iodide, lithium sulfide,...

Embodiment 1

[0054] Take Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix with lithium carbonate (Li(mol) / NiCoMn(mol)=1.06), sinter at 800°C for 8h, cool to room temperature and then break; disperse the intermediate product in the ethanol solution of nano-titanium dioxide and polyethylene oxide PEO (in ethanol Under stirring state, add 0.3% by weight of titanium dioxide and 0.5% by weight of polyethylene oxide (PEO) respectively, stir for 1 hour, dry; sinter at 1000°C for 8 hours, cool to room temperature (about 25°C, the same below), crush and sieve ; Obtain the large grain body ternary positive electrode material of the lithium ion battery.

[0055] In this embodiment, the large-grain body ternary positive electrode material of the lithium-ion battery is LiNi 0.5 co 0.2 mn 0.3 o 2 / titanium dioxide complex.

[0056] figure 2 and image 3 Respectively for the large grain body LiNi prepared in this embodiment 0.5 co 0.2 mn 0.3 o 2 / TiO2 composite scanning electron microscope image, figure...

Embodiment 2

[0059] The preparation method is the same as in Example 1, and the precursor is Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , after the precursor and lithium source were mixed, the sintering temperature was 850°C and the time was 8h; after the intermediate product was mixed with the modification additive and binder, the sintering temperature was 1010°C and the time was 8h. The test method is the same as that of Example 1 above.

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Abstract

The invention discloses a large-crystal ternary positive electrode material of a lithium ion battery and a preparation method of the large-crystal ternary positive electrode material. The method comprises the steps of mixing a Ni-Co-Mn precursor and a lithium source, performing sintering for 5-12 hours under 400-1,050 DEG C, and performing cooling and smashing; and adding an intermediate product to a solution comprising a modified additive and a binding agent, performing mixing and drying, performing sintering for 5-12 hours under 500-1,100 DEG C, and performing cooling, smashing and sieving to obtain the large-crystal ternary positive electrode material of the lithium ion battery, wherein the large-crystal ternary positive electrode material of the lithium ion battery is a secondary particle formed by self-assembly and agglomeration of small single crystals. The process is simple and mature, is wide in application range and can be used for industrial production on a large scale. The lithium ion battery prepared by the method has the characteristics of high energy density and excellent cycle property.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium-ion battery large-grain body ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery system, as a widely used high-efficiency energy storage device, has been widely used in the fields of portable electronic digital products and electric vehicles, and plays an increasingly important role in today's society. In the near future, it is more expected to be used in large-scale energy storage (wind energy, solar energy, water energy and tidal energy, etc.) The big questions of development have huge implications. The ternary battery system is the leader in the lithium-ion battery system. It has a mature commercialization background and higher energy density than the existing lithium iron phosphate battery system. It has always been a hot spot in industrial and scientific research. Its positive electrode ternary...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 余随淅黄震雷马洁杨新河周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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