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Mononuclear multi-shell lithium iron manganese phosphate positive electrode material, preparation method and secondary battery

A multi-shell ferromanganese phosphate and lithium manganese iron phosphate technology, which is applied in the direction of secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problems that the electrochemical performance of lithium manganese iron phosphate cathode materials needs to be further improved, and achieve improvement Excellent electrochemical performance, improved compaction density, and low-temperature performance

Active Publication Date: 2022-08-02
FOSHAN DYNANONIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide a single-core multi-shell lithium manganese iron phosphate positive electrode material and its preparation method, as well as a secondary battery, aiming to solve the electrochemical performance of the existing lithium manganese iron phosphate positive electrode material to a certain extent. raised questions

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  • Mononuclear multi-shell lithium iron manganese phosphate positive electrode material, preparation method and secondary battery
  • Mononuclear multi-shell lithium iron manganese phosphate positive electrode material, preparation method and secondary battery
  • Mononuclear multi-shell lithium iron manganese phosphate positive electrode material, preparation method and secondary battery

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preparation example Construction

[0035] as attached figure 2 As shown, the second aspect of the embodiments of the present application provides a preparation method of a single-core multi-shell lithium manganese iron phosphate composite material, comprising the following steps:

[0036] S10. Preparation of carbon-coated lithium iron phosphate particles;

[0037] S20. Prepare carbon-coated lithium iron manganese phosphate particles of different particle sizes;

[0038] S30. Using the carbon-coated lithium iron phosphate particles as the inner core, in the order of the particle size of the carbon-coated lithium iron phosphate particles from small to large, successively preparing a lithium iron phosphate coating layer on the outer surface of the inner core to form A plurality of lithium manganese iron phosphate coating layers are obtained to obtain a single-core multi-shell lithium manganese iron phosphate composite material.

[0039] In the preparation method of the single-core multi-shell lithium iron manga...

Embodiment 1

[0069] A single-core multi-shell lithium manganese iron phosphate composite material, the preparation of which comprises the steps:

[0070] 1. Take 1 g of lithium iron phosphate LFP and pass nitrogen through a tube furnace, add 0.2 g of glucose, and bake at 750 °C for 5 hours to obtain carbon-coated lithium iron phosphate.

[0071] 2. Take 400g of lithium iron manganese phosphate LFMP and pass nitrogen through the tube furnace, add 80g of glucose and mix well, then take 4g respectively and roast at 630℃ for 5h to obtain the first carbon-coated lithium iron manganese phosphate particles; take 12g and press it at 670℃ The second carbon-coated lithium iron manganese phosphate particles were obtained by roasting for 5 hours; 84 g were roasted at 700°C for 5 hours to obtain the third carbon-coated lithium manganese iron phosphate particles; 300 g were roasted at 750 °C for 5 hours to obtain the fourth carbon-coated phosphoric acid. Lithium iron manganese particles.

[0072] 3. Af...

Embodiment 2

[0084] A single-core multi-shell lithium manganese iron phosphate composite material, the preparation of which comprises the steps:

[0085] 1. Take 1 g of lithium iron phosphate LFP and pass nitrogen through a tube furnace, add 0.2 g of glucose and bake at 800 °C for 5 hours to obtain carbon-coated lithium iron phosphate.

[0086]2. Take 500g of lithium iron manganese phosphate LFMP and pass nitrogen through the tube furnace, add 100g of glucose and mix well, then take 5g respectively and roast at 650℃ for 5h to obtain the first carbon-coated lithium iron manganese phosphate particles; take 15g and press it at 700℃ The second carbon-coated lithium iron manganese phosphate particles were obtained by roasting for 5 hours; 90 g were roasted at 730°C for 5 hours to obtain the third carbon-coated lithium manganese iron phosphate particles; 390 g were roasted at 800 °C for 5 hours to obtain the fourth carbon-coated phosphoric acid. Lithium iron manganese particles.

[0087] 3. Aft...

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a single-core multi-shell lithium iron manganese phosphate positive electrode material, a preparation method thereof and a secondary battery. The composite material comprises a carbon-coated lithium iron phosphate inner core and a plurality of lithium manganese iron phosphate coating layers coating the outer surface of the inner core, the lithium manganese iron phosphate coating layer comprises lithium manganese iron phosphate particles and a carbon material coating the lithium manganese iron phosphate particles; and the particle sizes of the lithium manganese iron phosphate particles in the plurality of lithium manganese iron phosphate coating layers are gradually increased from inside to outside along the radial direction. The composite material prepared by the method disclosed by the invention is of a single-core multi-shell structure, the core is carbon-coated lithium iron phosphate, the shell is a plurality of lithium manganese iron phosphate coating layers, and the composite material can be used for preparing the lithium iron phosphate composite material through regular arrangement of the lithium iron phosphate core, the plurality of lithium manganese iron phosphate coating layers and particle sizes thereof. Therefore, the composite material has relatively high electrochemical properties such as energy density, conductivity, compaction density, safety and stability at the same time.

Description

technical field [0001] The application belongs to the technical field of battery materials, and in particular relates to a single-core multi-shell lithium iron manganese phosphate positive electrode material and a preparation method thereof, and a secondary battery. Background technique [0002] Lithium-ion battery is an energy storage device that is widely used in the field of energy storage, power batteries and portable electronic devices. Lithium-ion batteries have advantages such as high operating voltage, low self-discharge, and good safety. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, separators and shells. The positive electrode materials mainly include lithium cobalt oxide, lithium manganate, nickel-manganese binary system, nickel-cobalt-manganese ternary system, and nickel-cobalt-aluminum ternary system. system, lithium iron phosphate, lithium iron manganese phosphate, etc. Among them, lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36H01M4/62H01M10/0525C01B25/45C01B32/15B82Y30/00
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525C01B25/45C01B32/15B82Y30/00C01P2004/80C01P2004/64C01P2004/62C01P2006/40H01M2004/021H01M2004/028Y02E60/10H01M4/36H01M4/58H01M4/136C01B32/05
Inventor 徐荣益杨艺孔令涌李意能刘其峰
Owner FOSHAN DYNANONIC
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