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Lithium manganese phosphate positive pole material and preparation method thereof

A cathode material, lithium manganese phosphate technology, used in battery electrodes, electrical components, circuits, etc., can solve problems such as not being able to achieve good improvement, reduce manganese dissolution, and achieve suppression of lattice distortion and good surface structure. Effects of stability, guaranteed safety performance and cycle performance

Active Publication Date: 2014-04-23
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it adopts the method of evenly replacing some manganese ions with iron ions and cobalt ions, the prepared LiFe 0.05 co 0.05 mn 0.9 PO 4 The material can't make a good improvement in reducing the dissolution of manganese in the material

Method used

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  • Lithium manganese phosphate positive pole material and preparation method thereof
  • Lithium manganese phosphate positive pole material and preparation method thereof

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preparation example Construction

[0024] The invention discloses a preparation method of lithium manganese phosphate cathode material, which comprises the following steps:

[0025] Step a) mix the aqueous solution of Mn source compound and M1 source compound with PO 4 3- Mix in the reaction kettle, adjust the pH value to 2-7, and get Mn after reaction 1-y-z Ml y PO 4 , the concentration of the Mn source compound in the aqueous solution is 1-y-z mol / L, the concentration of the M1 source compound in the aqueous solution is y mol / L, 0≤y≤0.3, 0

[0026] Step b) Add the aqueous solution of the M2 source compound dropwise to the reaction kettle, adjust the pH value to 2-7, and the M2 source compound and PO 4 3- reaction to form Mn coated with phosphate of M2 1-y-z Ml y PO 4 , the concentration of the aqueous solution of the M2 source compound is z mol / L;

[0027] Step c) mixing the product obtained in step b), the lithium source compound and the carbon source compound, ball milling and dry mixing, roas...

Embodiment 1

[0038](1) Dissolve 0.7mol of manganese nitrate and 0.05mol of iron nitrate (M1 compound) in 1L of deionized water to form a mixed solution containing Mn and Fe elements, wherein the concentration of Mn is 0.7mol / L, and the concentration of Fe is 0.05 mol / L; Dissolve 0.25mol of ferric nitrate (M2 compound) in 1L of deionized water to form a solution containing Fe element, wherein the concentration of Fe is 0.25mol / L; dilute 85% concentrated phosphoric acid with deionized water to obtain 1mol / L phosphoric acid solution 1L; prepare 1mol / L NH 3 ·H 2 O solution 1L;

[0039] (2) Use a peristaltic pump to slowly drop the mixed solution containing Mn and Fe elements prepared above and the phosphoric acid solution into the transmission reactor at the same time, wherein the drip rate of the peristaltic pump is 0.1mL / s, and the heating temperature of the reactor is 30 ℃, the stirring speed is 100r / min, by adjusting the NH 3 ·H 2 The drop rate of the O solution stabilizes the pH valu...

Embodiment 2

[0042] (1) Dissolve 0.8mol of manganese carbonate and 0.1mol of magnesium sulfate (M1 compound) in 1L of deionized water to form a mixed solution containing Mn and Mg elements, wherein the concentration of Mn is 0.8mol / L, and the concentration of Mg is 0.1 mol / L; Dissolve 0.1mol of cobalt sulfate (M2 compound) in 1L of deionized water to form a solution containing Co element, wherein the concentration of Co is 0.1mol / L; dilute 85% concentrated phosphoric acid with deionized water to obtain 1mol / L phosphoric acid solution 1L; prepare 1mol / L NH 3 ·H 2 O solution 1L;

[0043] (2) Use a peristaltic pump to slowly drop the mixed solution containing Mn and Mg elements and the phosphoric acid solution into the transmission reactor at the same time, wherein the dripping rate of the peristaltic pump is 0.5mL / s, and the heating temperature of the reactor is 50 ° C. The speed is 500r / min, by adjusting NH 3 ·H 2 The drop rate of the O solution stabilizes the pH value of the reaction ...

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Abstract

The invention discloses a lithium manganese phosphate positive pole material which comprises Li[x]Mn[1-y-z]M1[y]M2[z]PO[4] particles and a carbon layer coated on the surface of the Li[x]Mn[1-y-z]M1[y]M2[z]PO[4] particles, wherein the concentration of M2 gradually decreases from the particle surface to the center. Correspondingly, the invention also provides a preparation method of the lithium manganese phosphate positive pole material. Compared with the positive pole material with uniformly distributed doping substances, the gradient-structure positive pole material has higher surface structure stability, and avoids the side reaction with the electrolyte, thereby lowering the leaching amount of manganese and ensuring the safety performance and cycle performance of the material. In addition, a doping element is distributed in the gradient-structure positive pole material in a gradient mode, thereby well inhibiting lattice distortion caused by Jahn-Teller effect.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, and more specifically, relates to a lithium manganese phosphate positive electrode material and a preparation method thereof. Background technique [0002] The olivine-type lithium manganese phosphate cathode material has the advantages of high working voltage, mild synthesis conditions, wide source of raw materials, and no pollution to the environment. It is considered to be the preferred cathode material for power lithium-ion batteries that is expected to replace lithium iron phosphate. However, lithium manganese phosphate has a large amount of Mn at the end of charging 3+ , high spin Mn 3+ It will cause the Jahn-Teller effect, causing the Mn-O bond to change along the a, b, and c axes, thereby distorting and breaking the structure of the lithium manganese phosphate material, which will seriously affect the cycle performance of the lithium manganate cathode material. In a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 夏永高刘兆平陈立鹏张明浩
Owner 宁波富理电池材料科技有限公司
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