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Modified lithium iron manganese phosphate material, its preparation method and application

A modified technology of lithium iron manganese phosphate, applied in chemical instruments and methods, phosphorus compounds, active material electrodes, etc., can solve the problems of lithium ion battery cycle performance, poor rate performance, and low electronic conductivity and lithium ion diffusion rate , to achieve the effect of high charge and discharge efficiency and capacity, low charge transfer resistance and long cycle life

Active Publication Date: 2022-06-07
SVOLT ENERGY TECHNOLOGY CO LTD
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a modified lithium iron manganese phosphate material, its preparation method and application, to solve the problem of low electronic conductivity and lithium ion diffusion rate in the lithium iron manganese phosphate material in the prior art, and its composition The problem of poor cycle performance and rate performance of lithium-ion batteries

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  • Modified lithium iron manganese phosphate material, its preparation method and application
  • Modified lithium iron manganese phosphate material, its preparation method and application

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preparation example Construction

[0025] According to another aspect of the present invention, the present invention also provides a method for preparing the above-mentioned modified lithium iron manganese phosphate material, comprising the steps of: mixing a manganese source, a phosphorus source, an iron source, a lithium source, a magnesium source and water, forming an intermediate reaction solution; drying and pre-calcining the intermediate reaction solution in sequence to obtain a core layer precursor; mixing the core layer precursor with a boron source and then performing calcination to obtain a modified lithium iron manganese phosphate material.

[0026] In the above preparation method, the manganese source, phosphorus source, iron source, lithium source, magnesium source and water are mixed to form an intermediate reaction solution. In this way, the magnesium source can be mixed with the main components of lithium iron manganese phosphate to promote The dispersion uniformity is better, and in the subsequ...

Embodiment 1

[0041] 1. Mn (CH 3 COO) 2 ·4H 2 O, NH 4 H 2 PO 4 , Fe(CH 3 COO) 2 , CH 3 COOLi·2H 2 O, Mg(OH) 2 Mix uniformly at a molar ratio of 0.44:1:0.58:1.05:0.03, dissolve in 300 mL of deionized water, stir evenly with a stirring paddle, and place it in a 65°C water bath to stir for 6 hours to obtain an intermediate reaction solution.

[0042] 2. The obtained intermediate reaction solution was dried in a vacuum drying oven at 105°C for 24h, and then subjected to roller crushing and ultracentrifugation grinding and pulverization in sequence, and then placed in a nitrogen protective atmosphere, in a tube furnace at 400°C. Pre-calcined for 6 h at a heating rate of 2 °C / min to obtain the core layer precursor;

[0043] 3. Take the above 10g of the core layer precursor, and perform the roller crushing and ultracentrifugation grinding and pulverization treatment in turn. 45% of the total body weight) was mixed and heated to 700 °C in a nitrogen atmosphere, the heating rate was 2 °C / ...

Embodiment 2

[0046] The difference from Example 1 is:

[0047] Mn(CH 3 COO) 2 ·4H 2 O, NH 4 H 2 PO 4 , Fe(CH 3 COO) 2 , CH 3 COOLi·2H 2 O, Mg(OH) 2 The mixture is 0.43:1:0.59:1.05:0.01, and the boric acid is 60% of the total weight of the precursor of the core layer. In the pre-calcination process, the treatment temperature was 350°C and the treatment time was 8h; in the calcination process, the treatment temperature was 750°C and the treatment time was 10h. The obtained modified lithium iron manganese phosphate material has a lithium iron manganese phosphate core layer of Li(Fe 0.57 Mn 0.43 ) 0.99 Mg 0.01 PO 4 , and the cladding layer is a boron oxide layer.

[0048] The particle size of the magnesium-doped lithium iron manganese phosphate core layer is 6 μm, and the average thickness of the boron-containing cladding layer is 8 nm.

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Abstract

The invention provides a modified lithium iron manganese phosphate material, its preparation method and application. The above-mentioned modified lithium iron manganese phosphate material comprises a magnesium-doped lithium iron manganese phosphate core layer and a boron-containing cladding layer coated on the surface of the magnesium-doped lithium iron manganese phosphate core layer. The modified lithium iron manganese phosphate material of the present invention comprises a magnesium-doped lithium iron manganese phosphate core layer and a boron-containing coating layer coated on the surface of the magnesium-doped lithium iron manganese phosphate core layer. Based on this structure, the material has higher electrical conductivity and lithium ion diffusion ability, lower charge transfer resistance, and better stability. When it is used as the cathode material of lithium-ion batteries, the rate performance of the battery is better, the first charge and discharge efficiency and capacity are higher, and the cycle performance is better, especially the cycle life is longer.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a modified lithium iron manganese phosphate material, a preparation method and application thereof. Background technique [0002] Cathode materials with high specific capacity have always been one of the key factors limiting the wide application of lithium-ion batteries. Among the many cathode materials, LiFe 1 -xMn x PO 4 Both LiMnPO 4 Relatively high voltage and LiFePO 4 The advantage of structural stability. However, LiFe x Mn 1-x PO 4 Medium FeO 6 with MnO 6 Octahedron via PO 4 Tetrahedral connections cannot form a continuous conductive network, making the material relatively poor in conductivity. Meanwhile, MnPO 4 with FePO 4 The existing structural differences make the thermal stability of the material also poor. [0003] However, although scholars have carried out a lot of research on synthesis and modification methods, LiFe 1- xMn x PO 4 The positive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B25/45C01B35/10
CPCH01M4/366H01M4/5825H01M4/624H01M4/626H01M10/0525C01B25/45C01B35/1027H01M2004/021H01M2004/028Y02E60/10
Inventor 聂荣健刘道淦王守兵陈岩
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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