A kind of high-nickel ternary precursor co-doped with metal vanadate compound and preparation method thereof

The technology of metal vanadate compound and precursor is applied to the field of high nickel ternary precursor co-doped with metal vanadate compound and its preparation field, which can solve the problems such as limited application of copper vanadate material, and solve the problem of cycle rate Poor performance, low electrochemical impedance, and the effect of improving the yield of the production line

Active Publication Date: 2021-07-13
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its layered structure and multi-step reduction during intercalation or deintercalation of lithium ions (Cu 2+ / Cu + and Cu + / Cu 0 ) characteristics, as an electrode material can provide higher energy density, electrode specific capacity, and excellent cycle performance, but the prepared flake or flower-shaped copper vanadate materials are extremely limited in the application of lithium-ion battery cathode materials

Method used

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  • A kind of high-nickel ternary precursor co-doped with metal vanadate compound and preparation method thereof
  • A kind of high-nickel ternary precursor co-doped with metal vanadate compound and preparation method thereof
  • A kind of high-nickel ternary precursor co-doped with metal vanadate compound and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0058] This embodiment includes the following steps:

[0059] (1) Take 30 L of 25% industrial ammonia water to obtain complexing agent solution A; uniformly mix 12 kg of sodium hydroxide with hot pure water to prepare 30 L of precipitant solution B;

[0060] (2) Mix 16.462 kg nickel sulfate hexahydrate, 2.217 kg cobalt sulfate heptahydrate, 0.658 kg manganese sulfate monohydrate (nickel-cobalt-manganese molar ratio Ni:Co:Mn=8.0:1.0:1.0) with hot pure water Prepare 50L metal salt solution C;

[0061] (3) Mix 1.2193 kg of sodium metavanadate with hot pure water, mix thoroughly to obtain 10 L of vanadium salt solution D, and store it in a constant temperature water bath at a constant temperature of 35 °C until use;

[0062] (4) Mix 0.0599 kg of anhydrous lithium hydroxide with hot pure water to prepare 5 L of co-doped metal salt solution E, and keep it sealed for later use;

[0063] (5) Solutions A, B, C, and E are kept at a constant temperature of 40°C; add hot pure water to 1...

Embodiment 2

[0069] This embodiment includes the following steps:

[0070] (1) Mix 15 L of water and 9 kg of ethylenediamine evenly, and adjust the pH of the system to 10.5 with sodium hydroxide to obtain complexing agent solution A; mix 12 kg of sodium hydroxide with 30 L of deionized hot pure water Prepare precipitant solution B together;

[0071] (2) Fully mix 28.52 kg manganese nitrate hexahydrate, 3.158 kg cobalt nitrate heptahydrate, 6.072 kg manganese nitrate tetrahydrate (nickel-cobalt-manganese molar ratio Ni:Co:Mn=7.3:0.9:1.8) with deionized hot pure water After uniformity, the volume was adjusted to 60 L to obtain metal salt solution C;

[0072] (3) Mix 2.2069 kg of sodium orthovanadate with hot pure water, mix completely and set the volume to 15 L to obtain vanadium salt solution D, and store it in a constant temperature water bath at a constant temperature of 40 °C until use;

[0073] (4) Mix 0.7887 kg of magnesium sulfate heptahydrate with hot pure water to prepare 8L of co...

Embodiment 3

[0080] This embodiment includes the following steps:

[0081] (1) Mix hot pure water and 1.0 kg of ethylenediaminetetraacetic acid evenly, adjust the pH value of the solution to 11.5 with sodium hydroxide solution, and prepare 100 L complexing agent solution A; mix hot pure water with 0.92 kg Sodium hydroxide was mixed evenly to prepare 100 L of precipitant solution B;

[0082] (2) Mix 73.788 kg of nickel chloride hexahydrate, 24.628 kg of cobalt chloride hexahydrate, and 20.524 kg of manganese chloride tetrahydrate (nickel-cobalt-manganese molar ratio Ni:Co:Mn=6:2:2) with hot pure water. Mix well and prepare 200 L metal salt solution C;

[0083] (3) Dissolve 3.6400 kg of vanadium pentoxide in sodium hydroxide, mix it evenly and set the volume to 20 L to obtain vanadium salt solution D, and store it in a constant temperature water bath at a constant temperature of 45 °C until use;

[0084] (4) Mix 8.6600 kg of lanthanum nitrate hexahydrate with hot pure water to prepare 10 L...

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Abstract

The invention provides a high-nickel ternary precursor co-doped with metal vanadate compounds and a preparation method thereof. During the co-precipitation reaction process, metal vanadate compounds are doped to realize synergistic doping of one or more than two metals to modify nickel, cobalt, manganese or aluminum ternary precursor materials; during the preparation process, the complexing agent solution and the metal solution are divided into two upper and lower liquid inlet pipes and added to the reaction kettle. Different regulation methods and growth process parameters are used at different stages of precursor growth to prepare flake-shaped, slender spindle-shaped, thick and short Ternary precursors with special primary particle shapes such as rods or internally loose, porous, dense, hollow and other cross-sectional shapes can meet the needs of lithium batteries with different properties for precursors with different physical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a ternary precursor of positive electrode materials for lithium ion batteries and a preparation method thereof, in particular to a high-nickel ternary precursor co-doped with metal vanadate compounds and a preparation method thereof. Background technique [0002] High-nickel layered transition metal oxides are currently one of the most promising cathode materials for lithium-ion batteries, such as LiNi 1-x-y mn x co y o 2 (NCM) and LiNi 1-x-y co x Al y o 2 (NCA) has aroused great interest among researchers in both industry and academia. Nickel (Ni), as a substitute for cobalt (Co) in high-nickel cathodes, has a magnetoresistance effect. When discharging, Li + It will be mixed into the nickel layer to form Li-Ni mixed row, rather than just stored between the oxide layer, which leads to high capacity of the high nickel ternary precursor cathode material, while ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505C01G53/00H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/30C01P2004/32C01P2004/61C01P2006/12H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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