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Lithium manganese phosphate composite cathode material and preparation method and application thereof

A composite positive electrode material, lithium manganese phosphate technology, applied in the direction of phosphate, phosphorus oxyacid, phosphorus compound, etc., can solve the problems of low conductivity, poor safety, and can not fundamentally solve the cost, toxicity and safety of lithium batteries

Inactive Publication Date: 2017-02-22
博尔特新材料(银川)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lithium cobalt oxide LiCoO 2 Due to the disadvantages of high price, shortage of resources, and poor safety, the application in power lithium batteries is hindered; lithium manganese oxide LiMn 2 o 4 It is a positive electrode material for lithium batteries following the commercialization of lithium cobalt oxide. Its cycle performance has been improved to a certain extent, but the high temperature cycle performance has not been solved, which limits its application in power batteries, especially electric vehicle power supplies; nickel cobalt manganese acid Lithium LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and lithium iron phosphate LiFePO 4 Ternary materials have shown great potential to replace lithium cobalt oxide in recent years, but this cannot fundamentally solve the cost, toxicity and safety problems of lithium batteries
[0004] Lithium manganese phosphate has the characteristics of low cost and wide source of raw materials. It has broad application prospects in lithium battery cathode materials. At present, the preparation methods of lithium manganese phosphate include solid-phase method and microwave hydrothermal method, but according to reports, they all have operation cumbersome, many synthesis steps and other shortcomings, and the prepared lithium manganese phosphate cathode material has an Achilles heel, its poor conductivity, its low electrical conductivity, it is difficult to obtain commercial application

Method used

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  • Lithium manganese phosphate composite cathode material and preparation method and application thereof
  • Lithium manganese phosphate composite cathode material and preparation method and application thereof
  • Lithium manganese phosphate composite cathode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix Ti and C powders with a mass purity of 98.5% and a particle size of <1 μm at a ratio of 1:1 to make a mixture, and then add water and grinding balls at a mass ratio of 1:2:3, Ball mill at a speed of 400rpm for 2h, then dry, and statically press at 240MPa, hold the pressure for 5min, then raise the temperature from 25°C to 1800°C at a rate of 2°C / min, and calcinate at 1800°C for 10h, cool and pulverize Produce TiC;

[0034] (2) Add 155.88g of lithium dihydrogen phosphate, 367.72g of manganese acetate, 3.4g of magnesium acetate, 10.1g of iron oxide, 0.7g of niobium pentoxide, 1.0g of silver oxide, and 20g of TiC into 500ml of ethanol and stir to disperse, then ball mill to make ball mill slurry;

[0035] (3) drying the ball milled slurry to obtain a precursor, followed by ball milling, crushing, and compacting to obtain a green body;

[0036] (4) The green body was placed in nitrogen and calcined at 850° C. for 16 hours, then cooled, pulverized, and compacted to...

Embodiment 2

[0038](1) Mix Ti and C powders with a mass purity of 98.5% and a particle size of <1 μm at a ratio of 1:1 to make a mixture, and then add water and grinding balls at a mass ratio of 1:2:3, Ball mill at a speed of 400rpm for 2h, then dry, and statically press at 240MPa, hold the pressure for 5min, then raise the temperature from 25°C to 1800°C at a rate of 2°C / min, and calcinate at 1800°C for 10h, cool and pulverize Produce TiC;

[0039] (2) Add 1125.0g of lithium acetate, 1150.1g of manganese carbonate, 1151.4g of ammonium dihydrogen phosphate, 12.8g of magnesium oxide, 4.9g of aluminum oxide, 12.8g of copper oxide, 4.8g of cerium oxide, and 33g of TiC into 10L of water and stir to disperse, followed by ball milling to obtain a ball mill slurry;

[0040] (3) drying the ball milled slurry to obtain a precursor, followed by ball milling, crushing, and compacting to obtain a green body;

[0041] (4) The green body was baked at 550° C. for 20 h in argon, then cooled, pulverized,...

Embodiment 3

[0043] (1) Mix Ti and C powders with a mass purity of 98.5% and a particle size of <1 μm at a ratio of 1:1 to make a mixture, and then add water and grinding balls at a mass ratio of 1:2:3, Ball mill at a speed of 400rpm for 2h, then dry, and statically press at 240MPa, hold the pressure for 5min, then raise the temperature from 25°C to 1800°C at a rate of 2°C / min, and calcinate at 1800°C for 10h, cool and pulverize Produce TiC;

[0044] (2) Stir and disperse 38g of lithium carbonate, 93.5g of manganese hydroxide, and 122g of 85% phosphoric acid in 100g of water, then add 1.05g of zirconia, 0.6g of zinc oxide, 1.5g of ammonium metavanadate, 1.8g of manganese acetate, 0.35g of Lanthanum oxide and 28g TiC, followed by ball milling to make a ball mill slurry;

[0045] (3) drying the ball milled slurry to obtain a precursor, followed by ball milling, crushing, and compacting to obtain a green body;

[0046] (4) The green body was placed in argon and calcined at 1200° C. for 2 ho...

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Abstract

The invention discloses a lithium manganese phosphate composite cathode material and a preparation method and application thereof. According to the method, lithium manganese phosphate is used as a matrix, and TiC and a dopant wrap the outside of the matrix to obtain the lithium manganese phosphate composite cathode material. The method is gentle in reaction condition, simple in process, convenient to operate, low in production cost, and simple and controllable in synthesis path; the morphology and the size of the material are easily micro-regulated; the material is suitable for being produced on a large scale; and the prepared lithium manganese phosphate composite cathode material is good in electrical conductivity, high in conductivity, high in capacity and good in rate capability.

Description

technical field [0001] The invention relates to the preparation and application of new energy materials, in particular to a lithium manganese phosphate composite cathode material and a preparation method and application thereof. Background technique [0002] As a new type of energy storage power supply, lithium-ion batteries have the advantages of high working voltage, high energy density, no memory effect, and low discharge rate. They are now widely used in electric vehicles, communication equipment, energy storage equipment, aerospace and other fields. Among them, the positive electrode of the battery plays an important role in the performance of the battery. [0003] Commercial lithium battery cathode materials mainly include lithium cobalt oxide LiCoO 2 , lithium manganese oxide LiMn 2 o 4 , lithium nickel cobalt manganese oxide LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and lithium iron phosphate LiFePO 4 Four kinds. Among them, lithium cobalt oxide LiCoO 2 Due to the disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/505H01M10/0525H01M4/36C01B25/45C01B25/37C01B25/26
CPCC01B25/265C01B25/377C01B25/45H01M4/362H01M4/505H01M4/58H01M10/0525Y02E60/10
Inventor 侯春平孙永林贺超
Owner 博尔特新材料(银川)有限公司
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