Low-cost low-cobalt single crystal ternary positive electrode material and preparation method thereof

A positive electrode material and ternary material technology, which is applied in the field of low-cost low-cobalt single crystal nickel-cobalt-manganese ternary positive electrode material preparation, can solve the problems of high sintering energy consumption, harsh sintering conditions, and environmental impact, and achieve simple preparation process, Low equipment requirements, reducing the effect of mixing processes

Inactive Publication Date: 2021-02-09
陕西彩虹新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the co-precipitation method to prepare small particle precursors needs to spend about 25% of the manufacturing cost to deal with the problem of waste liquid discharge
On the other hand, due to the use of lithium hydroxide in low-cobalt single crystal ternary products, a large amount of irritating strong alkali waste solid gas will be generated during the batching and sintering process, which not only affects the environment, but also requires corresponding waste solid gas treatment equipment, and the sintering conditions are harsh , high sintering energy consumption and other issues

Method used

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  • Low-cost low-cobalt single crystal ternary positive electrode material and preparation method thereof
  • Low-cost low-cobalt single crystal ternary positive electrode material and preparation method thereof
  • Low-cost low-cobalt single crystal ternary positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0023] A low-cost LiNi 0.55 co 0.15 mn 0.3 o 2 A single crystal ternary cathode material and a preparation method thereof, comprising the following steps:

[0024] 1) Preparation of lithium-containing precursor A

[0025] First, weigh 0.05mol Co in turn according to the stoichiometric ratio 3 o 4 , 0.295mol MnO, 0.5mol NiO, 0.05mol nickel acetate, 1.03mol lithium carbonate, 0.02mol lithium dihydrogen phosphate and 0.001mol Y 2 o 3 , according to the order of easily soluble, difficult to tolerate, and insoluble, add them to the grinder for coarse and fine grinding, control the solid content of deionized water to 35%, grind until the particle size of the insoluble matter is ≤0.5 μm, and spray dry at 320 ° C to obtain the Lithium ternary precursor A.

[0026] 2) Preparation of highly dispersed single crystal ternary material B

[0027] The pulverized lithium-containing precursor A material was sintered once, sintered in air at 950°C for 12 hours, crushed, and passed thro...

Embodiment 2

[0033] A low-cost LiNi 0.83 co 0.12 mn 0.05 o 2 A single crystal ternary cathode material and a preparation method thereof, comprising the following steps:

[0034] (1) Preparation of lithium-containing precursor A

[0035] First, weigh 0.7molNiO, 0.04molCo in turn according to the stoichiometric ratio 3 o 4 , 0.05molMnO, 0.13mol nickel acetate, 1.02mol lithium hydroxide, 0.025 lithium dihydrogen phosphate and 0.002mol ZrO 2 , according to the order of easily soluble, difficult to tolerate, and insoluble, add it to the grinder for coarse and fine grinding, control the solid content of deionized water to 35%, grind until the particle size of the insoluble matter is ≤0.5 μm, and spray dry at 260°C to obtain the content Ternary precursor A. .

[0036] (2) Preparation of highly dispersed single crystal ternary material B

[0037] The pulverized lithium-containing precursor material A was sintered once, and sintered in an oxygen atmosphere at 830°C for 12 hours. After bein...

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Abstract

The invention discloses a low-cost low-cobalt single crystal ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: adding a nickelsource, cobalt oxide, manganese oxide, a lithium source and an M doping agent in a certain stoichiometric ratio into a grinding machine, carrying out wet grinding until the particle size of insolublesubstances is less than or equal to 0.5 mu m, and carrying out spray drying to obtain an energy-saving, low-cost and low-cobalt lithium-containing ternary precursor A; carrying out high-temperature oxygen-enriched sintering and crushing treatment on the A to obtain a high-dispersion single-crystal ternary material matrix B; and coating X with B by a dry method, carrying out solid-phase sinteringin a low-temperature air atmosphere, and carrying out crushing treatment to obtain the low-cost low-cobalt single-crystal positive electrode material. The manufacturing process is environmentally friendly, pollutant emission in the precursor preparation and product sintering process is avoided, the operation process is simple and controllable, and the cost is low. Meanwhile, double doping and surface coating are achieved, the structure of the material is stabilized, the migration speed of lithium ions on the surface of the product is increased, and residual alkali on the surface of the productis reduced. The material is high in capacity and good in cycling and high-temperature safety.

Description

Technical field: [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a low-cost low-cobalt single crystal nickel-cobalt-manganese ternary positive electrode material. Background technique: [0002] With the reduction of national policy subsidies for new energy vehicles, the intensification of international competition for lithium and cobalt resources, and the continuous increase in the mileage requirements of new energy vehicles, the cost pressure of domestic and foreign lithium battery companies is also rapidly intensifying. Lithium battery cathode materials account for nearly 60%, so high-performance, low-cost cathode materials have become a hot spot in the lithium battery industry. Low-cobalt-high-nickel ternary materials are favored by researchers because of their high capacity, good safety, and low price. [0003] In addition, compared with ordinary secondary spherical te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/10C30B29/22H01M4/505H01M4/525H01M10/0525
CPCC30B1/10C30B29/22H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王慧萍吕明张帅琦李崇乔水伶方向乾曹壮
Owner 陕西彩虹新材料有限公司
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