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High-nickel single-crystal ternary cathode material with low surface residual alkali content and preparation method thereof

A positive electrode material, low surface technology, applied in the field of high-nickel single crystal ternary positive electrode material and its preparation, can solve the problem of high residual alkali on the surface, achieve the effect of improving compaction density, simple process and low cost

Inactive Publication Date: 2019-11-12
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a high-nickel single crystal ternary positive electrode material with low surface residual alkali and its preparation method, so as to solve the problem of high residual alkali on the surface of the high nickel single crystal ternary positive electrode material in the prior art

Method used

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  • High-nickel single-crystal ternary cathode material with low surface residual alkali content and preparation method thereof
  • High-nickel single-crystal ternary cathode material with low surface residual alkali content and preparation method thereof
  • High-nickel single-crystal ternary cathode material with low surface residual alkali content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, lithium hydroxide powder, nano-sized zirconia (ZrO), D50 precursor material Ni 0.85 co 0.1 mn 0.05 (OH) 2 Put it in a ball mill tank, and perform high-speed ball milling to mix evenly; wherein, the molar ratio of lithium element to metal element in the precursor is 1.06, and the mass fraction of zirconium element added to the total material is 5000ppmw. Under the condition that the volume concentration of the oxygen atmosphere is 50-99%, the sintering is carried out once, the temperature is 830° C., and the temperature is kept for 16 hours. After cooling to room temperature, crushing with a jaw crusher, crushing with a roller crusher, and sieving to obtain a primary sintered material a for later use, the primary sintered material a is a single crystal matrix material LiNi 0.85 co 0.1 mn 0.05 o 2 .

[0044] The above-mentioned primary sintered material a was subjected to water-washed and non-water-washed comparison experiments; the primary sintered material...

Embodiment 2

[0049] First, lithium hydroxide powder, nano-titanium oxide, and D50 precursor material Ni 0.83 co 0.12 mn 0.05 (OH) 2 Put it in a ball mill tank, and carry out high-speed ball milling to mix evenly; wherein, the molar ratio of lithium element to metal element in the precursor is 1.04, and the mass fraction of titanium element added in the total material is 5000ppmw. Under the condition that the volume concentration of the oxygen atmosphere is 50-99%, the sintering is carried out once, the temperature is 840° C., and the temperature is kept for 16 hours. Cooling, jaw crushing, roller crushing, crushing, and sieving; after cooling to room temperature, crushing with a jaw crusher, crushing with a roller crusher, and sieving to obtain a primary sintered material b for subsequent use, and the primary sintered material b is a single crystal LiNi 0.83 co 0.12 mn 0.05 o 2 .

[0050] The above-mentioned primary sintered material b was washed and unwashed for comparative experi...

Embodiment 3

[0055] First, lithium hydroxide powder, nano-barium oxide, and D50 precursor material Ni 0.80 co 0.10 mn 0.10 (OH) 2 , placed in a ball mill tank, and mixed uniformly by high-speed ball milling; wherein, the molar ratio of lithium: precursor metal element is 1.03, and the mass fraction of barium element added to the total material is 5000ppmw. Under the condition that the volume concentration of the oxygen atmosphere is 50% to 99%, the primary sintering is carried out at a temperature of 850°C, and after cooling to room temperature, it is pulverized by a jaw crusher, crushed by a double-roll crusher, and sieved to obtain a primary sintered material c for later use. The primary sintering material c is a single crystal matrix material LiNi 0.80 co 0.10 mn 0.10 o 2 .

[0056] Take the primary sintered material c, and carry out the comparison experiment between washing and unwashed; take the primary sintered material c and put it in deionized water according to the solid-to...

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Abstract

The invention discloses a high-nickel single-crystal ternary cathode material with low surface residual alkali content and a preparation method thereof. The preparation method comprises the followingsteps: weighing lithium hydroxide, an oxide additive and a nickel-cobalt-manganese ternary precursor, and carrying out uniform mixing through a dry high-speed mixing process so as to prepare a mixed material; subjecting the mixed material to first sintering so as to obtain a first sintered material; crushing the first sintered material, and carrying out sieving so as to obtain a first crushed material; weighing the first crushed material, a coating agent and deionized water, and carrying out water washing under stirring so as to prepare a slurry, wherein the coating agent comprises an elementX which is one or more selected from the group consisting of B, Al, Ba, Zr, Mg, Ca, Ti, Si, V, Sc, Nb, Ta and Z; drying the slurry under a vacuum condition through a dynamic rotary drying process so as to obtain a dry material; subjecting the dry material to secondary sintering so as to obtain a secondary sintered material; and crushing the secondary sintered material, and carrying out sieving soas to obtain a product. The high-nickel single-crystal ternary cathode material and the preparation method thereof provided by the invention has the following advantages: alkali reduction by water washing and in-situ coating by a wet process can be synchronously completed; the process is simple; high compaction density is realized; and the content of residual alkali is low.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries for vehicles, in particular to a high-nickel single crystal ternary positive electrode material with low surface residual alkali and a preparation method thereof. Background technique [0002] NCM is the mainstream power battery in the field of passenger vehicles. The energy density of NCM can be improved not only by increasing the Ni content in the ternary cathode material to achieve the purpose of increasing the specific capacity, but also by increasing the charge-discharge cut-off voltage and material compaction density. Compared with the conventional secondary spherical ternary cathode material, the single crystal ternary cathode material can not only increase the charge-discharge cut-off voltage, but also increase the compaction density of the material. Therefore, single crystal ternary cathode materials have gradually become the main research direction to replace convent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M4/505H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/61H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 方明毛秦钟胡子俊施翼杰张中彩吉同棕王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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