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Modified lithium ferric manganese phosphate material, and preparation method and application thereof

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 effects of high charge and discharge efficiency and capacity, low charge transfer resistance, and better cycle performance

Active Publication Date: 2021-08-06
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ferric manganese phosphate material, and preparation method and application thereof
  • Modified lithium ferric manganese phosphate material, and preparation method and application thereof

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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 following steps: mixing manganese source, phosphorus source, iron source, lithium source, magnesium source and water, An intermediate reaction liquid is formed; the intermediate reaction liquid is sequentially dried and pre-calcined to obtain a nuclear layer precursor; the nuclear layer precursor is mixed with a boron source and then calcined to obtain a modified lithium iron manganese phosphate material.

[0026] In the above preparation method, first utilize manganese source, phosphorus source, iron source, lithium source and magnesium source and water to mix, form intermediate reaction liquid, like this, can earlier magnesium source and iron manganese phosphate lithium main component be mixed, impel the magnesium source The dispersion uniformity is better, and during the ...

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 evenly at a molar ratio of 0.44:1:0.58:1.05:0.03, dissolve in 300mL deionized water, stir evenly with a stirring paddle, place it in a water bath at 65°C and stir for 6 hours to obtain an intermediate reaction solution.

[0042] 2. Dry the obtained intermediate reaction solution in a vacuum drying oven at 105°C for 24 hours, and then perform roller crushing and ultra-centrifugal grinding and crushing in turn, and then place it in a nitrogen protective atmosphere and heat it in a tube furnace at 400°C Intermediate calcining for 6 hours, with a heating rate of 2°C / min, to obtain the core layer precursor;

[0043] 3. Take the above 10g nuclear layer precursor, and carry out roller crushing and ultracentrifugal grinding and pulverizing treatment to it successively. The D50 of the nuclear layer precursor precursor is 8 μm, and mix it with 8.2g boric acid (boric acid is its pre...

Embodiment 2

[0046] The difference with 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 mixing ratio is 0.43:1:0.59:1.05:0.01, and the boric acid is 60% of the total weight of the precursor and the core layer precursor. During the pre-calcination process, the treatment temperature was 350°C and the treatment time was 8h; during the roasting treatment, the treatment temperature was 750°C and the treatment time was 10h. The obtained modified iron manganese phosphate lithium material, its iron manganese phosphate lithium core layer is Li(Fe 0.57 mn 0.43 ) 0.99 Mg 0.01 PO 4 , the cladding layer is a boron oxide layer.

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

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Abstract

The invention provides a modified lithium ferric manganese phosphate material, and a preparation method and application thereof. The modified lithium iron manganese phosphate material comprises a magnesium-doped lithium iron manganese phosphate nuclear layer and a boron-containing coating layer coating the surface of the magnesium-doped lithium iron manganese phosphate nuclear layer. The modified lithium iron manganese phosphate material comprises a magnesium-doped lithium iron manganese phosphate nuclear layer and a boron-containing coating layer coating the surface of the magnesium-doped lithium iron manganese phosphate nuclear layer. Based on the structure, the material is higher in conductivity and lithium ion diffusivity, lower in charge transfer impedance and better in stability. When the composite material is used as a positive electrode material of a lithium ion battery, the rate capability of the battery is better, the first charge-discharge efficiency and capacity are higher, the cycle performance is better, and 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, its preparation method and application. Background technique [0002] The cathode material with high specific capacity has always been one of the key factors limiting the wide application of lithium-ion batteries. Among many cathode materials, LiFe 1 -xMn x PO 4 Both LiMnPO 4 Relatively high voltage and LiFePO 4 Advantages of structural stability. However, LiFe x mn 1-x PO 4 Medium FeO 6 with MnO 6 Octahedral via PO 4 Tetrahedral connections fail to form a continuous conductive network, making the material relatively poorly conductive. At the same time, MnPO 4 with FePO 4 The existing structural differences make the thermal stability of the material poor. [0003] However, although scholars have done a lot of research on the synthesis and modification methods, LiFe 1- wxya x PO 4 The positive electrode mat...

Claims

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Application Information

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Patent Type & Authority Applications(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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