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Method for preparing high-compaction lithium manganese iron phosphate by explosion method

A technology for solidifying lithium iron manganese phosphate and lithium iron manganese phosphate is applied in the field of preparing high-pressure lithium iron manganese phosphate by an explosion method, and can solve the problems of poor electrochemical performance and energy density of lithium iron manganese phosphate, and compaction density of lithium iron manganese phosphate. problems such as poor lithium iron manganese phosphate and large particle size of lithium iron manganese phosphate, to achieve the effect of facilitating large-scale preparation, improving electrochemical performance and energy density, and improving compaction density

Active Publication Date: 2022-04-12
江苏贝特瑞纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the three-stage compaction and calcination process is complex and takes a long time to prepare; and the process is uncontrollable, which makes the particle size of lithium manganese iron phosphate larger and unevenly distributed, resulting in poor compaction density of lithium manganese iron phosphate, which in turn leads to manganese phosphate The electrochemical performance and energy density of lithium iron are not good

Method used

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Embodiment 1

[0044] A method for preparing high-pressure lithium iron manganese phosphate by explosive method, the lithium iron manganese phosphate molecular formula LiMn x Fe 1-x PO 4 , the preparation method comprises the following steps:

[0045] S1. Preparation of precursor powder:

[0046] (1) Take 0.5mol of lithium source, 0.5mol of iron phosphate and 0.5mol of manganese source, place lithium source, iron phosphate and manganese source in the ratio of n(lithium source) / n(iron phosphate + manganese source)=0.5 In the ball mill tank, add zirconium beads and 50kg of mixed medium, seal it and place it in a ball mill, and after ball milling at a speed of 200r / min at room temperature for 2 hours, the mixed material is obtained; the mixed medium is tap water; the lithium source is carbonic acid Lithium; The manganese source is manganese carbonate;

[0047] (2) Put the mixed material in a drying oven, pre-dry it at 60°C and grind it into powder to obtain the precursor powder;

[0048] S...

Embodiment 2

[0057] A method for preparing high-pressure lithium iron manganese phosphate by explosive method, the lithium iron manganese phosphate molecular formula LiMn x Fe 1-x PO 4 , the preparation method comprises the following steps:

[0058] S1. Preparation of precursor powder:

[0059] (1) Take 0.5mol of lithium source, 0.5mol of iron phosphate and 0.5mol of manganese source, place lithium source, iron phosphate and manganese source in the ratio of n(lithium source) / n(iron phosphate + manganese source)=0.5 In the ball mill tank, add zirconium beads and 50kg of mixed medium, seal it and place it in a ball mill, and after ball milling at a speed of 300r / min at room temperature for 6 hours, the mixed material is obtained; the mixed medium is tap water; the lithium source is carbonic acid Lithium; The manganese source is manganese carbonate;

[0060] (2) Put the mixture in a drying oven, pre-dry it at 80°C and grind it into powder to obtain the precursor powder;

[0061] S2. Prep...

Embodiment 3

[0070] A method for preparing high-pressure lithium iron manganese phosphate by explosive method, the lithium iron manganese phosphate molecular formula LiMn x Fe 1-x PO 4 , the preparation method comprises the following steps:

[0071] S1. Preparation of precursor powder:

[0072] (1) Take 0.5mol of lithium source, 0.5mol of iron phosphate and 0.5mol of manganese source, place lithium source, iron phosphate and manganese source in the ratio of n(lithium source) / n(iron phosphate + manganese source)=0.5 In the ball mill tank, add zirconium beads and 50kg mixed medium, seal it and place it in a ball mill, and after ball milling at a speed of 400r / min for 10 hours at room temperature, the mixed material is obtained; the mixed medium is tap water; the lithium source is carbonic acid Lithium; The manganese source is manganese carbonate;

[0073] (2) Put the mixed material in a drying oven, pre-dry it at 100°C and grind it into powder to obtain the precursor powder;

[0074] S2...

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Abstract

The invention relates to the technical field of lithium manganese iron phosphate, in particular to a method for preparing high-compaction lithium manganese iron phosphate through an explosion method. According to the method for preparing the high-compaction lithium manganese iron phosphate through the explosion method, the molecular formula of the lithium manganese iron phosphate is LiMnxFe1-xPO4, and the preparation method comprises the following steps that S1, precursor powder is prepared; s2, preparing an emulsion matrix; s3, preparing a blasting charge; s4, explosive synthesis; and S5, ball-milling refining: carrying out dry ball-milling on the crude lithium manganese iron phosphate for 2-8 hours to obtain the high-compaction lithium manganese iron phosphate. The preparation method disclosed by the invention has the advantages that the formation of high-compaction nanoscale lithium manganese iron phosphate is facilitated, the compaction density of the lithium manganese iron phosphate is improved, and the electrochemical performance and the energy density of the material can be further improved. In addition, raw materials used in the explosion method are cheap, the synthesis process is simple, the preparation time is short, the energy consumption is low, and large-scale preparation is facilitated.

Description

technical field [0001] The present application relates to the technical field of lithium manganese iron phosphate, more specifically, it relates to a method for preparing high-pressure compacted lithium manganese iron phosphate by an explosion method. Background technique [0002] Lithium manganese phosphate is a natural mineral or artificially synthesized ternary lithium battery positive electrode material. The unique structure can maintain the stability of the crystal form during the process of lithium ion intercalation and extraction, and has good stability, so that it has stable physical and chemical properties when used as an electrode material. Lithium manganese phosphate theoretically has a specific capacity of 171mAh / g and a discharge platform of about 4.1 V, which also makes lithium manganese phosphate an ideal material for a new generation of lithium-ion power batteries. [0003] In related technologies, the compacted density of lithium iron manganese phosphate is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCY02E60/10
Inventor 王曼岳海峰郭欢李槐华黄祥坤虎国栋管攀磊
Owner 江苏贝特瑞纳米科技有限公司
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