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Metal doped and Mxene coated double modified lithium iron phosphate composite material, and preparationmethodand application

A technology of lithium iron phosphate and composite materials, applied in chemical instruments and methods, phosphorus compounds, non-metallic elements, etc., can solve the problem of poor electronic conductivity and ion conductivity, poor cycle performance and rate performance, and small diffusion coefficient of lithium ions and other problems, to achieve the effect of good uniformity, high specific surface area, good conductivity and hydrophilicity

Active Publication Date: 2019-12-20
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the poor electronic conductivity and ion conductivity of lithium iron phosphate in lithium ion batteries in the prior art. During charging and discharging, the diffusion coefficient of lithium ions is small, resulting in small discharge capacity of the material at room temperature, poor cycle performance and The problem of poor magnification performance

Method used

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  • Metal doped and Mxene coated double modified lithium iron phosphate composite material, and preparationmethodand application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1). Put Ti 3 C 2 Put it in a furnace and heat it at 200°C for 1.5min, then cool it down to room temperature naturally to get TiO 2 / Ti 3 C 2 composite materials;

[0037] (2). 1.0mol / L ferrous oxalate (the added volume is 0.75L), 2.0mol / L ammonium dihydrogen phosphate, 4.0mol / L LiOH according to the molar ratio of iron element, phosphate radical and lithium element is 1 :1.2:1.05 were placed in the reactor in turn, stirred at 100r / min for 1h, then added 0.15mol Ti 3 C 2 TiO prepared by heating in step (1) 2 / Ti 3 C 2 Composite material, adjust the pH of the solution to 8. Nitrogen was introduced at a flow rate of 2L / min, and the temperature of the reactor was raised to 120°C. After reacting for 2 hours, it was cooled to room temperature, centrifuged, and dried to obtain the precursor product;

[0038] (3). The precursor product of step (2) is placed in a high-temperature furnace, and N is introduced at a flow rate of 1L / min. 2 , raise the temperature of the ...

Embodiment 2

[0040] (1). Put Ti 3 C 2 After heating at 250 °C for 5 min in a furnace, it was naturally cooled to room temperature to obtain TiO 2 / Ti 3 C 2 composite material;

[0041] (2). The 3.0mol / L ferrous oxalate (the added volume is 0.25L), 2.0mol / L ammonium dihydrogen phosphate, and 4.0mol / L LiOH are 1 according to the molar ratio of iron, phosphate and lithium. : 1.2: 1.05 were placed in the reactor in turn, stirred at 100r / min for 30min, and then added 0.4mol Ti 3 C 2 TiO prepared by heating in step (1) 2 / Ti 3 C 2 composite material, adjust the pH of the solution to 8, introduce nitrogen gas, heat the reaction kettle to 120°C, react for 2 hours, cool to room temperature, centrifuge, and dry to obtain the precursor product;

[0042] (3). The precursor product of step (2) is placed in a high-temperature furnace, and N is fed at a flow rate of 1 L / min. 2 , the high temperature furnace was heated to 550 °C for 6 hours of high temperature sintering, cooled down, and cooled ...

Embodiment 3

[0044] (1). Zr 3 C 2 After heating at 200°C for 1.5min in a furnace, it was naturally cooled to room temperature to obtain ZrO 2 / Zr 3 C 2 composite material;

[0045] (2) 2.0mol / L ferrous oxalate (the added volume is 0.5L), 2.0mol / L ammonium dihydrogen phosphate and 4.0mol / L lithium acetate are 1 according to the molar ratio of iron element, phosphate group and lithium element :1.1:1.1 were placed in the reactor in turn, stirred at 120r / min for 3h, and then added 0.1mol Zr 3 C 2 ZrO prepared by heating in step (1) 2 / Zr 3 C 2 composite material, adjust the pH of the solution to 8, introduce nitrogen at a flow rate of 2L / min, heat the reaction kettle to 120°C, react for 2h, cool to room temperature, centrifuge, and dry to obtain the precursor product;

[0046] (3). The precursor product of step (2) is placed in a high-temperature furnace, and N is fed at a flow rate of 1 L / min. 2 , the high-temperature furnace was heated to 550 °C for 6 hours of high-temperature sint...

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Abstract

The invention discloses a preparation method of a metal doped and Mxene coated double modified lithium iron phosphate composite material. The preparationmethod comprises the following steps that S1, alithium iron phosphate / Mxene precursor is prepared, specifically, an iron salt solution, a phosphoric acid or a salt solution thereof and a lithium salt solution are sequentially placed in a reactionkettle, the Mxene is added after stirring evenly, the pH of a solution is adjusted to 7-10, after protective gas is introduced for reaction, cooling is conducted to the room temperature, and a precursor product is obtained by centrifugal separation and drying; and S2, the precursor product of the step 1 is placed in a high-temperature furnace, sintering is conducted at high temperature in an inert atmosphere, and cooling is conducted to the room temperature to obtain the metal doped and Mxene coated double modified lithium iron phosphate composite material. Double modifying is conducted on the lithium iron phosphate through doping and Mxene surface coating, the conductivity of an electrode material is effectively improved, and the prepared composite material shows excellent large-rate performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a metal-doped and Mxene-coated double-modified lithium iron phosphate composite material for lithium-ion batteries and its preparation method and application. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high working voltage, good safety, and no memory effect, and are widely used in many portable electronic devices such as notebook computers, mobile phones, and instrument lamps. At the same time, lithium-ion batteries also have good application prospects in the fields of electric vehicles, electric tools, and energy storage power stations. Therefore, with the continuous expansion of the application field of lithium-ion batteries and the continuous upgrading and replacement of corresponding products, higher and higher requirements will be put forward for lithium-ion batteries, and the most dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/36H01M4/58H01M4/62H01M10/0525C22B34/12C22B34/14C22B34/22B82Y30/00B82Y40/00
CPCC01B25/45H01M4/364H01M4/626H01M4/5825H01M10/0525C22B34/1281C22B34/14C22B34/22B82Y30/00B82Y40/00H01M2004/028C01P2004/80C01P2004/64C01P2004/62C01P2006/40Y02E60/10
Inventor 吴其修
Owner GUANGDONG DONGDAO NEW ENERGY
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