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Lithium ferric manganese phosphate as cathode material of lithium ion battery and preparation method thereof

A technology of lithium iron manganese phosphate and lithium-ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as low platform voltage, no batch protection circuits and chargers, and application restrictions, so as to reduce difficulty and improve Ion conductivity and electron conductivity, effect of battery cost reduction

Inactive Publication Date: 2011-03-30
天津斯特兰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low platform voltage (3.3V), there is no batch protection circuit and charger, so its application on electronic equipment is limited

Method used

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  • Lithium ferric manganese phosphate as cathode material of lithium ion battery and preparation method thereof
  • Lithium ferric manganese phosphate as cathode material of lithium ion battery and preparation method thereof
  • Lithium ferric manganese phosphate as cathode material of lithium ion battery and preparation method thereof

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Experimental program
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Embodiment 1

[0039] Reference attached Figure 1 to Figure 4 .

[0040] A lithium-ion battery cathode material lithium iron manganese phosphate, which has Mg doped ions, and the chemical composition of the battery cathode material lithium iron manganese phosphate is Li 0.99 Mg 0.01 Fe 0.4 Mn 0.6 PO 4 .

Embodiment 2

[0042] Reference attached Figure 1 to Figure 4 .

[0043] Lithium iron manganese phosphate lithium ion battery cathode material 0.99 Mg 0.01 Fe 0.4 Mn 0.6 PO 4 The preparation method, its preparation process: Weigh Li 2 CO 3 7.3182g, NH 4 H 2 PO 4 23.0067g, MnCO 3 13.794g, FeC 2 O 4 ·2H 2 O14.3949g, Mg(OH) 2 Place 0.1177g in a beaker, add 96mL of a mixed solution of water and ethanol, and then use a high-shear emulsifying disperser to disperse for 2h at a speed of 7.5Kr / min. Place the prepared slurry in an oven at 70°C. Dry for 10 hours, take it out and grind and put it into a crucible, then put the crucible into a muffle furnace, raise it to 450°C at a rate of 5°C / min, and pre-fire at a constant temperature for 15 hours to obtain a low-temperature lithium iron manganese phosphate material. Then add 5% polyvinyl alcohol to the low-temperature lithium iron manganese phosphate material, grind it for 1 hour, take it out and dry it and put it in a crucible, put the crucible in a muff...

Embodiment 3

[0045] Reference attached Figure 5 to Figure 8 .

[0046] A lithium-ion battery cathode material lithium iron manganese phosphate, which has Nb doped ions, and the chemical composition of the battery cathode material lithium iron manganese phosphate is Li 0.99 Nb 0.01 Fe 0.3 Mn 0.7 PO 4 .

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Abstract

The invention relates to a lithium ferric manganese phosphate as a cathode material of a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. The lithium ferric manganese phosphate as the cathode material has a chemical composition: Li1-yMyFel-xMnxPO4. The preparation method of the lithium ferric manganese phosphate as the cathode material comprises the following steps of: (1) synthesizing a precursor: placing raw materials into a container; adding a dispersant; grinding and dispersing 1-3 hours at rotation speed of 1000-2500r / min; and drying and grinding pasty paste; (2) preburning: heating to the temperature of 350-550 DEG C according to a heating rate of 1-10 DEG C / min; preburning 3-20 hours at constant temperature; cooling to room temperature along with a furnace; and preparing the lithium ferric manganese phosphate; and (3) coating carbon at high temperature: mixing and dispersing the lithium ferric manganese phosphate, a carbon source and the dispersant 1-3 hours; after drying, heating to the temperature of 600-850 DEG C by using a heating rate of 1-10 DEG C / min; insulating 3-20 hours; cooling to room temperature along with the furnace; and preparing the lithium ferric manganese phosphate. The invention has the advantages of simple technology, low cost of batteries, high safety of cathode materials, high thermal stability, electric conductivity increase, and the like.

Description

Technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a lithium-ion battery cathode material lithium iron manganese phosphate and a preparation method thereof. Background technique [0002] At present, lithium-ion battery is a kind of green high-energy battery, which is widely used in various portable electronic products and communication tools, and has good application prospects in electric vehicles. [0003] Lithium-ion battery cathode material is an important part of lithium-ion battery, and currently the most researched is LiCoO 2 , LiNiO 2 , LiMn 2 O 4 . LiCoO 2 It is the only cathode material commercialized on a large scale. The research is relatively mature and the overall performance is excellent, but there are safety problems. It may explode when overcharged and overheated. It is also expensive, low capacity, and highly toxic, which is harmful to the environment and human body. Certain damage. LiNiO 2 Th...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 段镇忠赵肃莹孔德香
Owner 天津斯特兰能源科技有限公司
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