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Layered cobaltosic oxide material and preparation method and application thereof

A layered technology of cobalt tetroxide, which is applied in the field of layered cobalt tetroxide material and its preparation, can solve the problems of irregular shape of cobalt trioxide material, which is not conducive to improving the cycle performance of lithium cobalt oxide cathode material, and uneven external structure, so as to improve cycle stability Uniform performance, shape, stable and orderly structure

Active Publication Date: 2022-03-29
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can be seen from the scanning electron microscope image that the prepared cobalt tetroxide material has irregular shape, and the surface has many large pores, the external structure is not uniform, and the tap density is only 2.0g / cm 3 This is not conducive to improving the cycle performance of lithium cobalt oxide cathode materials

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  • Layered cobaltosic oxide material and preparation method and application thereof
  • Layered cobaltosic oxide material and preparation method and application thereof
  • Layered cobaltosic oxide material and preparation method and application thereof

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preparation example Construction

[0034] In this embodiment, a method for preparing the layered cobalt tetroxide material is also provided, including the following steps:

[0035] S1: Add water into the reaction kettle as the bottom liquid, and put 200kg of cobalt carbonate as the seed crystal, the seed crystal size is 8-14 μm, adjust the pH to 7.5-8.5; combine the cobalt salt solution, soluble metal salt solution and precipitant solution Flow is added in the reactor, and the feed flow ratio of described cobalt salt solution, precipitant solution and soluble metal salt solution is (10-20):(20-32):1; Wherein, the feed flow rate of initial cobalt salt solution After 5-25 hours, the feed flow rate of the cobalt salt solution is adjusted to 5-25g / L, after 15-40h, the feed flow rate of the cobalt salt solution is adjusted to 65g / L; at the same time, the precipitant solution and the feed flow rate of the soluble metal salt solution are adjusted in proportion;

[0036] S2: Aging, filtering and washing the product ob...

Embodiment 1

[0049] A kind of layered tricobalt tetroxide material, its preparation method comprises the following steps:

[0050] S1: Using deionized water, configure 20g / L aluminum sulfate solution, 100g / L cobalt chloride solution and 130g / L ammonium bicarbonate solution;

[0051] S2: Add 200L deionized water into the reaction system as the bottom liquid, and put 200kg of cobalt carbonate as the seed crystal, the seed crystal size is about 10μm, and adjust the pH to 8.0; then the prepared cobalt chloride solution and ammonium bicarbonate solution And the aluminum sulfate solution is fed into the reaction kettle at the same time by means of co-current feeding, the feed flow ratio of the cobalt chloride solution, the ammonium bicarbonate solution and the aluminum sulfate solution is 12:23.8:1; the temperature of the reaction kettle is 48°C, stirring Speed ​​is 280r / min; The feeding flow rate of cobalt chloride solution increases step by step in the feeding process, and initial cobalt chlor...

Embodiment 2

[0059] A kind of layered tricobalt tetroxide material, its preparation method comprises the following steps:

[0060] S1: Use deionized water, configure 40g / L aluminum nitrate solution, 150g / L cobalt sulfate solution and 180g / L ammonium bicarbonate solution;

[0061] S2: Add 200L of deionized water into the reaction system as the bottom liquid, and put 200kg of cobalt carbonate as the seed crystal, the seed crystal size is about 12 μm, and adjust the pH to 7.5; then the prepared cobalt nitrate solution, ammonium bicarbonate solution and The aluminum sulfate solution is fed into the reactor simultaneously in a co-current feeding manner, and the feed flow ratio of the cobalt sulfate solution, the ammonium bicarbonate solution and the aluminum nitrate solution is 10:22:1; the temperature of the reactor is 50°C, and the stirring rate is 280r / min; the feed flow rate of the cobalt salt solution increases step by step during the feeding process, the initial cobalt flow rate is 30L / h,...

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Abstract

The invention discloses a layered cobaltosic oxide material and a preparation method and application thereof. The layered cobaltosic oxide material comprises a plurality of loose layers and a plurality of compact layers, the loose layers and the compact layers are stacked from inside to outside, the loose layers are located in the center, the compact layers are located on the outermost layer, and the density of the loose layers is smaller than that of the compact layers. The layered cobaltosic oxide material provided by the invention has regular morphology, the interior of the layered cobaltosic oxide material is of a multi-layer loose and dense alternate layered structure, the structure is stable and ordered, the morphology is uniform, and when the layered cobaltosic oxide material is used for preparing a lithium ion battery, the cycle stability of the battery material can be improved.

Description

technical field [0001] The present application relates to the technical field of cathode materials for lithium-ion batteries, in particular to a layered tricobalt tetroxide material and its preparation method and application. Background technique [0002] With the rapid development of society and economy, global issues such as energy shortage, environmental protection, carbon peaking, and carbon neutrality have received more and more attention. The use of clean and renewable energy has become a future development trend. [0003] Lithium cobalt oxide cathode materials are widely used in 3C, electric vehicles, power tools, energy storage and wearable electronic products due to their high voltage, high power and stable cycle performance. Lithium cobalt oxide is usually prepared from lithium carbonate and tricobalt tetroxide by a high-temperature solid-state method; among them, tricobalt tetroxide is used as the precursor of lithium cobalt oxide cathode material, and its particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/61C01P2004/32
Inventor 谢文彬范勇张见曾雷英洪敏强
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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