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Lithium ion battery gradient anode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor material stability, crystal structure defects, and material failure, and achieve enhanced stability, enhanced rate performance, intercalation/ The effect of unimpeded exit channel

Active Publication Date: 2018-07-10
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application CN104781964A has prepared a positive electrode material with a spinel phase on the surface, and the rate performance of the material is improved, but the Jahn-Teller effect existing in the spinel phase material during the cycle will lead to material failure
The patent application CN104471759A prepared lithium-ion battery cathode materials as lithium cobalt-based oxides and surface-treated lithium nickel-based oxides. By adjusting the sintered particle size of the materials, the rate performance of the materials can be improved, but the single component and surface-treated materials The crystal structure is still flawed, making the material less stable

Method used

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  • Lithium ion battery gradient anode material and preparation method thereof
  • Lithium ion battery gradient anode material and preparation method thereof
  • Lithium ion battery gradient anode material and preparation method thereof

Examples

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Embodiment 1

[0049] A Ti gradient doped multi-element positive electrode material, the initial ratio of metal ions in the material is Ni:Co:Mn =0.80:0.10:0.10, and the change rule of the doping element D from the particle center to the particle surface is 0~0.02. The average particle size of the positive electrode material is about 12.0 μm, and the tap density is about 2.6 g / cm 3 .

[0050] The specific preparation method is as follows:

[0051] Prepare a 1.5 mol / L mixed solution with a molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate of 0.80:0.10:0.10 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanium sol stabilizer as solution (2) and put it into sub-tank R2, and then prepare the 2mol / L solution of titanium sol as solution (3) and put it into sub-tank R3. Add the solution in the sub-tank of R3 into R2 with stirring at a flow rate of 0.1 L / h to obtain a dopant element solution (4) with a continuously increasing concentr...

Embodiment 2

[0054] A Ti gradient doped multi-component positive electrode material, the initial metal ion ratio in the material is Ni:Co:Mn =0.60:0.20:0.20, and the change rule of the doping element D from the particle center to the particle surface is 0~0.03. The average particle size of the positive electrode material is about 16.0 μm, and the tap density is about 2.9 g / cm 3 .

[0055] The specific preparation method is as follows:

[0056] Prepare a 1.5 mol / L mixed solution with a molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate of 0.60:0.20:0.20 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanium sol stabilizer as solution (2) and put it into sub-tank R2, and then prepare the 2mol / L solution of titanium sol as solution (3) and put it into sub-tank R3. Add the solution in the sub-tank of R3 into R2 with stirring at a flow rate of 0.1 L / h to obtain a dopant element solution (4) with a continuously increasing concentrat...

Embodiment 3

[0059] A Ti gradient doped multi-component positive electrode material, the initial metal ion ratio in the material is Ni:Co:Mn =0.50:0.20:0.30, and the change rule of the doping element D from the particle core to the surface is 0~0.04. The average particle size of the gradient material is about 6.3 μm, and the tap density is about 2.1 g / cm 3 .

[0060] The specific preparation method is as follows:

[0061] Prepare a 1.5 mol / L mixed solution with a molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate of 0.50:0.20:0.30 and record it as solution (1) and put it into sub-tank R1. Prepare the solution containing titanium sol stabilizer as solution (2) and put it into sub-tank R2, and then prepare the 2mol / L solution of titanium sol as solution (3) and put it into sub-tank R3. Add the solution in the sub-tank of R3 into R2 with stirring at a flow rate of 0.1 L / h to obtain a dopant element solution (4) with a continuously increasing concentration. Then metal salt ...

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Abstract

The invention discloses a lithium ion battery gradient anode material and a preparation method thereof. The average composition formula of the material is Li0.3+deltaNixCoyMnzD1-x-y-zO2, delta is notsmaller than 0 and not larger than 0.9, x is not smaller than 0.3 and not larger than 1, y is not smaller than 0 and not larger than 0.4, z is not smaller than 0 and not larger than 0.4, D is one or more of Mo, Ca, Mg, Fe, Zr, Ti, Zn, Y, W, V, Nb, Sm, La, B, Al and Cr, and the content of the doping element D is continuously increased from the particle core to the surface. According to different rates of different regions in the spherical material, doping elements are optimally distributed; in the precipitation process, by changing the contents of the doping elements in different stages, the lithium ion transmission rate in the crystal structure inside the material is increased, then, the rate capability of an existing multi-element material is improved, and the cycle life of the material is prolonged; the process is continuous and controllable, operation is easy, the cost is low and the material is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a gradient cathode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the advantages of high discharge voltage, high specific energy, high specific power and long life, the ternary material LiNi, which is a cathode material for commercial lithium-ion batteries x co y mn 1-x-y o 2 It has become a research hotspot, and by adjusting the content of each element in it, a variety of positive electrode materials can be derived. In order to meet the needs of electric vehicles, the rate performance, cycle performance and safety performance of ternary materials are still needed. Among them, enhancing the rate performance of materials and taking into account other properties of materials has become one of the key issues to be solved urgently. [0003] When the traditional ternary positive electrode material is charged an...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王竞鹏刘亚飞陈彦彬张学全冯海兰
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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