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Spray drying preparation of spherical lithium manganate doped slurry

A technology of heteromanganese oxide and spherical shape, which is applied in the field of spray drying preparation of spherical doped lithium manganate slurry, which can solve the problems of fast product capacity decay, uncontrollable shape and size of lithium manganate particles, etc., and achieve cycle performance Improvement, environmental friendliness, uniform particle size effect

Inactive Publication Date: 2009-06-24
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to propose a slurry spray-drying preparation method for spherical doped lithium manganate to solve the problem of uncontrollable morphology and size of positive electrode material lithium manganate particles and rapid product capacity decay in the traditional solid-phase method The problem

Method used

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  • Spray drying preparation of spherical lithium manganate doped slurry
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  • Spray drying preparation of spherical lithium manganate doped slurry

Examples

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Embodiment 1

[0026] Example 1: Mix 1000g of manganese dioxide (EMD), 215g of lithium carbonate, 100g of chromium acetate solution (50wt.%), and 60g of soluble starch, add 2L of deionized water, and perform mechanical ball milling for 0.5-5h to obtain a uniformly mixed slurry The uniformly mixed slurry is spray-dried, the inlet temperature is 350 °C, and the outlet temperature is 100 °C to obtain spherical precursors; the spherical precursors are calcined at 500-700 °C for 3-6 hours, and then calcined at 700-800 °C 12-16h to obtain spherical chromium-doped lithium manganate Li 1.05 Cr 0.04 Mn 1.96 O 4 .

[0027] The battery performance tests of the obtained materials all used 2025 type button cells, which were assembled in a glove box filled with high-purity argon gas. The negative electrode adopts metal lithium sheet, the diaphragm adopts Celgard 2300 PP / PE / PP three-layer microporous composite membrane, and the electrolyte adopts 1mol·L -1 LiPF 6 / EC:DMC (1:1), where EC is ethylene c...

Embodiment 2

[0028] Example 2: Mix 500g of manganese dioxide (EMD), 123g of lithium carbonate, 62g of aluminum acetate, and 30g of PEG, add 1L of deionized water, and perform mechanical ball milling for 0.5-5h to obtain a uniformly mixed slurry; The material is spray-dried with an inlet temperature of 350 °C and an outlet temperature of 120 °C to obtain spherical precursors; the spherical precursors are calcined at 500-700 °C for 3-6 h, and then calcined at 700-800 °C for 12-16 h to obtain spherical aluminum-doped Lithium manganate Li 1.1 Al 0.1 Mn 1.9 O 4 . The battery was prepared according to the method of Example 1 and tested. Under the condition of charge and discharge rate of 0.2C, the initial discharge capacity of the material reaches 104.3mAh·g -1 , the capacity remains at 96.5mAh g after 50 cycles -1 , the capacity retention rate is only 93%.

Embodiment 3

[0029] Example 3: Mix 500g of manganese dioxide (CMD), 118g of lithium carbonate, 137g of magnesium acetate (tetrahydrate), and 30g of PVA, add 1L of deionized water, and perform mechanical ball milling for 0.5-5h to obtain a uniformly mixed slurry; The uniformly mixed slurry is spray-dried with an inlet temperature of 350°C and an outlet temperature of 120°C to obtain spherical precursors; the spherical precursors are calcined at 500-700°C for 3-6h, and then calcined at 700-800°C for 12-16h Obtain spherical magnesium-doped lithium manganate LiMg 0.2 Mn1.8 O 4 . The battery was prepared according to the method of Example 1 and tested. Under the condition of charge and discharge rate of 0.2C, the initial discharge capacity of the material reaches 111mAh·g -1 , the capacity remains at 101.7mAh g after 50 cycles -1 , the capacity retention rate is 92%.

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Abstract

The invention relates to a method for the spray drying of spherical doped lithium maganate slurry. The method comprises: mixing manganese dioxide, lithium carbonate, doped metal salt and a solution containing a dispersant according to a certain proportion; subjecting the mixture to mechanical mixing to obtain a uniformly mixed slurry; subjecting the uniformly mixed slurry to spray drying to obtain a spherical precursor; and roasting the precursor sectionally to obtain a spherical doped lithium manganate slurry cathode material product. The lithium manganate cathode material for lithium ion batteries has uniform granularity which averagely is 15mu m, uniform spherical shape and good cycle performance. The invention is simple in process, convenient in operation, environmentally friendly and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and relates to a method for preparing spherically doped lithium manganate slurry by spray drying. Background technique [0002] Spinel Lithium Manganate LiMn 2 O 4 With its rich manganese resources, low cost, good safety, no environmental pollution, and easy preparation, it has become the first choice of cathode materials for power lithium-ion batteries. In major projects, lithium manganate materials are listed as the preferred materials for power batteries to be vigorously developed to speed up their industrialization process. [0003] The main reason that hinders the industrialization of power battery-type lithium manganate is that its performance is not stable enough, that is, its capacity decays rapidly during the charge-discharge cycle, especially at high temperatures. The main factors affecting its cycle performance are: ① the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
Inventor 胡国荣彭忠东蒋庆来杜柯曹雁冰
Owner CENT SOUTH UNIV
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