Anode material with uniform porous structure and preparation method thereof

A porous structure and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of insufficient high-rate charge and discharge performance and power performance, insufficient contact between positive electrode materials and electrolyte, low tap density and compaction density, and achieve Improve cycle stability and thermal stability, reduce side reactions, and low cobalt content

Inactive Publication Date: 2021-11-16
HENAN KELONG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commercialized nickel-cobalt-lithium manganese oxide cathode materials in the market are mostly solid structures, which are usually prepared by solid-structure nickel-cobalt-manganese hydroxide precursors, and the solid structure makes the lithium ion transmission path long, and the cathode material is not in sufficient contact with the electrolyte. , resulting in insufficient high-rate charge-discharge performance and power performance
In addition, cathode materials with a shell on the outside and a hollow interior prepared by the template method or the inner core oxidation method, such as patents CN201310469896. The enhanced contact of the electrolyte can improve the rate and power performance of the positive electrode material to a certain extent, but the material with a hollow structure is prone to collapse during preparation or use due to the difference in internal and external structures, and the tap density and compaction density are relatively high. Low, the particle strength is not high, and the positive electrode material particles are easily broken when the pole piece is rolled, resulting in the destruction of the positive electrode material structure and affecting the electrical properties of the material
For the porous structure, many materials have been reported, such as patents CN202010881538.3, CN202010968022.2, CN202110130621.1, etc., a positive electrode material with a porous structure has been developed, but the pores inside the material are concentrated in the core, forming a large hole. Similar to the hollow structure, there are the same structural problems

Method used

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  • Anode material with uniform porous structure and preparation method thereof
  • Anode material with uniform porous structure and preparation method thereof
  • Anode material with uniform porous structure and preparation method thereof

Examples

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Embodiment 1

[0030] A cathode material with uniform porous structure Li 1.15 Ni 0.499 co 0.2 mn 0.3 W 0.001 o 2 @Al 2 o 3 &B 2 o 3 The preparation method comprises the following steps:

[0031] Synthesis of Ni-Co-Mn Oxalate Precursor Ni with Dense Structure by Co-precipitation Method 0.5 co 0.2 mn 0.3 C 2 o 4: Use sulfate containing Ni, Co, Mn to prepare a mixed metal salt solution with a total metal ion concentration of 2mol / L, the molar ratio of Ni, Co, and Mn is 5:2:3, and the prepared ammonium ion concentration is 5mol / L Ammonia solution, ammonium oxalate solution with an oxalate ion concentration of 3mol / L was prepared, and then added to a reaction kettle with pure water as the bottom liquid for reaction; during the reaction, the temperature was controlled at 55°C, and the stirring speed was controlled at 800r / L min, the pH is controlled at 10, and nitrogen is continuously fed into the reactor; the obtained solid-liquid mixture is filtered, separated, washed, and dried t...

Embodiment 2

[0036] A cathode material with uniform porous structure Li 1.1 Ni 0.545 co 0.15 mn 0.30 Mg 0.002 Ti 0.002 Y 0.001 o 2 @WO 3 The preparation method comprises the following steps:

[0037] Synthesis of Ni-Co-Mn Oxalate Precursor Ni with Dense Structure by Co-precipitation Method 0.55 co 0.15 mn 0.30 C 2 o 4 : Prepare a mixed metal salt solution with a total metal ion concentration of 2mol / L with sulfate containing Ni, Co, and Mn. The molar ratio of Ni, Co, and Mn is 55:15:30, and the ammonium ion concentration is 5mol / L. Ammonia solution, prepare an oxalic acid solution with an oxalate ion concentration of 3mol / L, and then add it to a reaction kettle with pure water as the bottom liquid for reaction; during the reaction, the temperature is controlled at 50°C, and the stirring speed is controlled at 600r / min , the pH is controlled at 11, and nitrogen gas is continuously fed into the reactor; the obtained solid-liquid mixture is filtered, separated, washed, and dried ...

Embodiment 3

[0042] A cathode material with uniform porous structure Li 1.08 Ni 0.598 co 0.1 mn 0.3 Zr 0.002 o 2 @Al 2 o 3 & WO 3 The preparation method comprises the following steps:

[0043] Synthesis of Ni-Co-Mn Oxalate Precursor Ni with Dense Structure by Co-precipitation Method 0.6 co 0.1 mn 0.3 C 2 o 4 : Use sulfate containing Ni, Co, Mn to prepare a mixed metal salt solution with a total metal ion concentration of 2mol / L, the molar ratio of Ni, Co, and Mn is 6:1:3, and the prepared ammonium ion concentration is 5mol / L Ammonia solution, ammonium oxalate solution with an oxalate ion concentration of 3mol / L was prepared, and then added to a reaction kettle with pure water as the bottom liquid for reaction; during the reaction, the temperature was controlled at 55°C, and the stirring speed was controlled at 700r / L min, the pH is controlled at 12, and nitrogen is continuously fed into the reactor; the obtained solid-liquid mixture is filtered, separated, washed, and dried to...

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Abstract

The invention discloses a positive electrode material with a uniform porous structure. The morphology of the positive electrode material is the uniform porous structure, the secondary particle D50 of the material is 2-15 [mu] m, and the porosity of the positive electrode material is 1.5-5%. The preparation method comprises the following steps: synthesizing a nickel-cobalt-manganese oxalate precursor with a compact structure by adopting a coprecipitation method, subjecting the oxalate precursor with the compact structure and a metal oxide doped with elements to mixing and presintering to obtain a doped nickel-cobalt-manganese oxide precursor with a uniform porous structure; and uniformly mixing the doped nickel-cobalt-manganese oxide precursor having the uniform porous structure with a lithium salt, carrying out primary sintering, carrying out mixing with a coating compound, and carrying out secondary sintering to finally obtain the doped and coated nickel-cobalt-lithium manganate positive electrode material with the uniform porous structure. The process of the method is simple, cost is relatively low, the performance of the material is obviously improved, and the prepared nickel-cobalt-lithium manganate positive electrode material with the uniform porous structure still has excellent rate capability and output power under the condition of low cobalt content.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material with a uniform porous structure and a preparation method thereof. Background technique [0002] In recent years, with the mass application of lithium-ion batteries in hybrid electric vehicles and 48V vehicle start-stop systems, the market has increasingly higher requirements for the rate and power performance of lithium-ion batteries. Nickel cobalt lithium manganate ternary material is widely used in the field of power batteries due to its high capacity and energy density, excellent cycle performance, reliable safety performance, and low toxicity. [0003] In order to improve the rate and power performance of lithium-ion batteries, one of the quick and effective methods is to increase the cobalt content in the nickel-cobalt lithium manganate ternary cathode material, but cobalt is a relatively scarce strategic metal and is expensive. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028C01P2004/80C01P2006/40Y02E60/10
Inventor 赵田罗依梦王天伟万传恒牛宏刚栗晓静徐云军文万超陈丹凤尹正中程迪
Owner HENAN KELONG NEW ENERGY CO LTD
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