Preparation method of lithium manganese iron phosphate

A technology of lithium manganese iron phosphate and iron phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as poor conductivity, difficult preparation, and limited improvement range, so as to improve conductivity and improve electrical conductivity. Chemical properties, effect of reducing local concentration

Pending Publication Date: 2022-02-08
湖南安尔信新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since LiMnPO 4 The extremely poor conductivity of , is considered as an insulator, leading to the synthesis of LiMnPO capable of reversible charge and discharge 4 Very difficult, which limits its development and application
[0004] Lithium manganese iron phosphate LiMn x Fe 1-x PO 4 (04 Developed on the basis of modification, its preparation is difficult, although Fe 2+ The introduction of lithium manganese phosphate can improve the electrochemical performance of lithium manganese phosphate, but the range of improvement is limited, and it is difficult to fully exert the electrochemical performance of the material, which makes it difficult for the prepared lithium manganese iron phosphate to meet the application requirements.

Method used

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  • Preparation method of lithium manganese iron phosphate
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  • Preparation method of lithium manganese iron phosphate

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Experimental program
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Effect test

Embodiment 1

[0034] A kind of preparation method of lithium manganese iron phosphate of the present invention comprises the following steps:

[0035] (1) At normal temperature, ferrous sulfate solution and phosphoric acid are injected into the premixing unit of the reactor in a continuous parallel flow and top feeding mode to obtain premixed raw materials;

[0036] (2) The pre-mixed raw materials enter the bottom of the reactor, and hydrogen peroxide is injected from the feeding port in the middle of the side of the reactor, and the molar ratio of ferrous, phosphoric acid and hydrogen peroxide in the reactor is controlled to be 1:1.2:1, and at the bottom of the reactor Carry out precipitation reaction, control the pH value of the reaction process to 1-2, and the reaction temperature is 60°C, react for 1h, then raise the temperature to 90°C, continue to react for 6h, and obtain a mixed slurry;

[0037] (3) filtering the mixed slurry obtained in step (2), and washing the obtained filter resi...

Embodiment 2

[0047] A kind of preparation method of lithium manganese iron phosphate of the present invention comprises the following steps:

[0048] (1) At normal temperature, ferrous sulfate solution and phosphoric acid are injected into the premixing unit of the reactor in a continuous parallel flow and top feeding mode to obtain premixed raw materials;

[0049] (2) The premixed raw materials enter the bottom of the reactor, and hydrogen peroxide is injected from the feeding port in the middle of the side of the reactor body, and the molar ratio of ferrous, phosphoric acid and hydrogen peroxide in the reactor is controlled to be 1:1.1:0.8, and at the bottom of the reactor Carry out precipitation reaction, control the pH value of the reaction process to be 1-2, and the reaction temperature is 50°C, react for 1h, then raise the temperature to 95°C, continue to react for 4h, and obtain a mixed slurry;

[0050] (3) filtering the mixed slurry obtained in step (2), and washing the obtained fi...

Embodiment 3

[0053] A kind of preparation method of lithium manganese iron phosphate of the present invention comprises the following steps:

[0054] (1) At normal temperature, ferrous sulfate solution and phosphoric acid are injected into the premixing unit of the reactor in a continuous parallel flow and top feeding mode to obtain premixed raw materials;

[0055] (2) The premixed raw materials enter the bottom of the reactor, and hydrogen peroxide is injected from the feeding port in the middle of the side of the reactor, and the molar ratio of ferrous, phosphoric acid and hydrogen peroxide in the reactor is controlled to be 1:1.25:0.7. Carry out precipitation reaction, control the pH value of the reaction process to 1-2, and the reaction temperature is 40°C, react for 2h, then raise the temperature to 85°C, continue to react for 8h, and obtain a mixed slurry;

[0056] (3) filtering the mixed slurry obtained in step (2), and washing the obtained filter residue to obtain an iron phosphate...

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Abstract

The invention discloses a preparation method of lithium manganese iron phosphate, wherein through a premixing unit and a stirring unit in a reaction kettle, the reaction is more uniform when an iron salt and a phosphate are mixed, the local concentration is reduced, a uniform iron phosphate precursor is prepared, and then the lithium manganese iron phosphate with uniform morphology is prepared by combining a wet method and a solid phase method. The conductivity of the lithium manganese iron phosphate is improved through carbon coating, and the cycle life, the first discharge capacity and the charge-discharge efficiency of the lithium manganese iron phosphate positive electrode material are improved.

Description

technical field [0001] The invention belongs to the field of new energy materials and relates to a preparation method of lithium manganese iron phosphate. Background technique [0002] With the enhancement of public awareness of environmental protection and the country's strong support in the field of new energy, lithium-ion batteries have gradually become widely used power storage devices. Lithium iron phosphate batteries are widely used in the field of new energy vehicles and energy storage due to their advantages such as good safety performance, long cycle life and low price, and because they do not contain precious metals and rare elements, they have abundant raw material reserves and relatively low environmental pollution. Small, lithium iron phosphate batteries are gradually favored by the market. However, the discharge voltage platform of lithium iron phosphate is low (~3.4V), and the compacted density is only 2.4g / cm 3 , leading to its low energy density, which lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/505H01M4/525
CPCC01B25/45H01M4/505H01M4/525C01P2004/03C01P2006/40Y02E60/10
Inventor 李普良苏凯州刘大可
Owner 湖南安尔信新材料有限责任公司
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