Reagent for wet coating of high-nickel ternary positive electrode material as well as preparation method and application of reagent

A technology of wet coating and positive electrode materials, which is applied in the direction of chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of cycle diving, material performance degradation, affecting material cycle life and safety performance, etc., and achieve the goal of blocking corrosion Effect

Pending Publication Date: 2021-01-05
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the development of society, cruising range and cost have gradually become an important indicator for consumers to choose new energy vehicles. Therefore, the positive electrode materials are gradually developed in the direction of high nickel (increasing capacity, increasing cruising range) and underestimating (reducing cost). The higher the level of residual alkali on the surface of the material and the more serious the mixing of lithium and nickel, the worse the cycle performance, the severe flatulence, and the lower safety performance
[0005] Currently, high nickel (n Ni ≥0.80) The production process of the material is mainly to reduce the residual alkali on the surface of the material by washing and coating, but the performance of the material will be greatly reduced after washing, and the internal resistance will increase at the same time, which will affect the cycle life and safety performance of the material
[0006] Patent CN201910041610.9 discloses a method for preparing dry and wet carbon-coated high-nickel ternary cathode materials. The cycle performance and rate performance of the material prepared by this method are improved, but the SEM image of the patent is used to find the material Uneven surface coating can easily lead to poor stability of material batches and risk of cyclic diving; patent 201811522126.X discloses the preparation method of lithium manganese iron phosphate and the method of coating ternary materials. The method adopts wet fusion method , to prepare nano-scale high-capacity cathode materials. The cycle performance and safety performance of the ternary materials prepared by this method are improved, but this method is designed for hydrothermal synthesis reactions, which is not suitable for industrialized large-scale production
Therefore, the wet coating process and the selection of coating agents for high-nickel cathode materials need to be optimized

Method used

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  • Reagent for wet coating of high-nickel ternary positive electrode material as well as preparation method and application of reagent
  • Reagent for wet coating of high-nickel ternary positive electrode material as well as preparation method and application of reagent
  • Reagent for wet coating of high-nickel ternary positive electrode material as well as preparation method and application of reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Al is preferred 2 (SO 4 ) 3 , MgSO 4 , Mn(CH 3 COO) 2 , MnSO 4 and Li 2 CO 3According to the molar ratio of metal ions aluminum ion, magnesium ion, manganese ion, manganese ion and lithium ion 1:1:0.5:0.5:1, weigh the mass respectively, dissolve them in 1L deionized water, stir in the reaction kettle at 30°C for 2h, and let stand A mixed salt solution with a total metal molar mass of 0.25 mol / L was obtained, which was recorded as reagent 1 for wet coating.

[0036] application:

[0037] S1. Put Ni 0.83 co 0.12 mn 0.05 (OH) 2 The ternary precursor is packed in a bowl, and pre-oxidized in an oxygen atmosphere furnace at 400°C for 2 hours to obtain a composite metal oxide; the average particle size of the nickel-cobalt-containing ternary precursor is 10.0um, and the specific surface area is 5m 2 / g, bulk density is 1.72g / cm 3 , the tap density is 2.05g / cm 3 ;

[0038] S2. Mix the composite metal oxide with battery-grade lithium hydroxide monohydrate at a li...

Embodiment 2

[0042] Al(NO 3 ) 3 , Ti(SO 4 ) 2 , NH 4 h 2 PO 4 and LiNO 3 Weigh the masses of aluminum ions, titanium ions, phosphorus ions and lithium ions respectively, dissolve them in 1L of deionized water and stir in a reactor at 20°C for 5 hours, and after standing still, the molar mass (the sum of the molar weights of metal ions and phosphorus ions) is 0.20 mol / L mixed salt solution, recorded as reagent 2 for wet coating.

[0043] application:

[0044] S1. Put Ni 0.80 co 0.10 mn 0.10 (OH) 2 The ternary precursor is packed in a bowl, and pre-oxidized in an air atmosphere furnace at 450°C for 6 hours to obtain a composite metal oxide; the average particle size of the nickel-cobalt-containing ternary precursor is 10.5um, and the specific surface area is 8m 2 / g, bulk density 1.75g / cm 3 , the tap density is 2.10g / cm 3 ;

[0045] S2. Mix the composite metal oxide with battery-grade lithium hydroxide monohydrate at a lithium-to-metal molar ratio of 1.06:1, and add ZrO with a...

Embodiment 3

[0049] Al[OCH(CH 3 ) 2 ] 3 and CTAB were weighed according to the molar ratio of aluminum and bromide ions of 2:1, dissolved in 1L of 75% ethanol solution respectively, stirred at 60°C for 3 hours, and weighed according to the molar ratio of aluminum and silicon ions of 1:1. 8 h 20 o 4 The Si solution was slowly dropped into the mixed solution and continued to stir for 7 hours. After standing still, a mixed salt solution with a total metal molar mass of 0.5 mol / L was obtained, which was recorded as reagent 3 for wet coating.

[0050] application:

[0051] S1. Put Ni 0.88 co 0.09 al 0.03 (OH) 2 The ternary precursor is packed in a bowl, and pre-oxidized in an air atmosphere furnace at 650°C for 4 hours to obtain a composite metal oxide; the average particle size of the nickel-cobalt-containing ternary precursor is 11.0um, and the specific surface area is 9m 2 / g, bulk density is 1.8g / cm 3 , the tap density is 2.25g / cm 3 ;

[0052] S2. Mix the composite metal oxide w...

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Abstract

The invention discloses a reagent for wet coating of a high-nickel ternary positive electrode material, and belongs to the technical field of lithium ion power batteries for new energy vehicles. The reagent for wet coating of the high-nickel ternary positive electrode material comprises the following raw materials: a metal source and / or a complexing agent and a solvent, wherein the metal source isat least one of a lithium source, an aluminum source, a magnesium source, a titanium source, a manganese source, a nickel source and a phosphorus source; the complexing agent is at least one of CTAB,citric acid and ammonium citrate; and the solvent is at least one of deionized water, ethanol, absolute ethyl alcohol and acetone. The reagent for wet coating coats the surface of a material througha liquid phase reaction, so that the surface of the material is uniformly coated, the circularity is good, and the residual alkali level is low.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries for new energy vehicles, and in particular relates to a reagent for wet-process coating of a high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] The ternary cathode material is currently one of the most widely used and most promising cathode materials on the market. The current mainstream ternary cathode materials in the market include NCM and NCA, and LiCoO 2 , LiNiO 2 and LiMnO 2 Compared with the three cathode materials, NCM or NCA combines the advantages of the above three materials to achieve a ternary synergistic effect, and has the advantages of high energy density, low cost, and good market prospects. [0003] The influence mechanism of the three elements in NCM and NCA on the electrochemical performance of the material is different. Among them, the main role of Ni is to help increase the batt...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/52H01M4/62H01M10/0525
CPCC01G53/006H01M4/62H01M4/505H01M4/523H01M10/0525C01P2004/03C01P2006/40C01P2006/10C01P2006/11C01P2006/12C01P2004/61Y02E60/10
Inventor 张中彩毛秦钟王鑫吕玉辰邱永华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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