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A kind of coated lithium iron manganese phosphate cathode material and its preparation method and application

A technology of lithium iron manganese phosphate and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of low rate performance and insufficient cycle stability, and achieve high rate performance, good cycle stability, and simple method easy effect

Active Publication Date: 2021-08-17
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above patents use graphene, metal, and carbon nanotubes to improve the compaction density and conductivity of lithium manganese iron phosphate, but its rate performance and cycle stability are still insufficient when charging and discharging at high currents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Preparation of sulfur-doped graphene

[0071] The mercaptan and graphene with a mass ratio of 0.01:1 were reacted at 100 ° C for 36 h under a reaction pressure of 1 MPa and airtight conditions, cooled naturally, washed, and dried to obtain a sulfur-doped graphene precursor. Heat treatment at 1000°C for 1 h under atmosphere, wash with deionized water five times, and dry at 60°C for 24 h to obtain sulfur-doped graphene.

[0072] (2) Preparation of nitrogen-doped oxides

[0073] Li with a mass ratio of 1:0.5 0.03 B 0.99 PO 4React with thiourea at 100°C for 72h under a pressure of 1MPa and airtight conditions, cool naturally, wash, and dry, and then heat-treat the dried product at 1100°C for 20h in a nitrogen atmosphere to obtain a nitrogen-doped oxide.

[0074] (3) Preparation of carbon source C2 (nitrogen, phosphorus co-doped carbon material)

[0075] Nitriding treatment of carbon black in an ammonia atmosphere, the temperature of nitriding treatment is 700°C, th...

Embodiment 2

[0083] (1) Preparation of sulfur-doped graphene

[0084] Diallyl sulfide and graphene with a mass ratio of 0.15:1 were reacted at 150° C. for 30 h under a reaction pressure of 15 MPa and airtight conditions, cooled naturally, washed, and dried to obtain a sulfur-doped graphene precursor. The precursor was heat-treated at 500 °C for 30 h under an argon atmosphere, washed 5 times with ethanol, and dried at 100 °C for 6 h to obtain sulfur-doped graphene.

[0085] (2) Preparation of nitrogen-doped oxides

[0086] The oxygen-containing compound and amino acid with a mass ratio of 1:2 were reacted at 150°C for 10h under a pressure of 30MPa and airtight, cooled naturally, washed, dried, and then the dried product was heat-treated at 1000°C for 5h in a nitrogen atmosphere to obtain nitrogen doped oxide; the oxygen-containing compound is Li 0.15 B 0.95 PO 4 and metatitanic acid mixture.

[0087] (3) Preparation of carbon source C2 (nitrogen, phosphorus co-doped carbon material)

...

Embodiment 3

[0096] (1) Preparation of sulfur-doped graphene

[0097] The sulfur phenol and graphene with a mass ratio of 0.03:1 were reacted at 280° C. for 1 h under a reaction pressure of 5 MPa and airtight conditions, cooled naturally, washed, and dried to obtain a sulfur-doped graphene precursor. Heat treatment at 600°C for 25h under nitrogen atmosphere, wash with deionized water four times, and dry at 80°C for 15h to obtain sulfur-doped graphene.

[0098] (2) Preparation of nitrogen-doped oxides

[0099] The oxygen-containing compound and the amino acid with a mass ratio of 1:0.3 were reacted at 150°C for 10h under a pressure of 30MPa and airtight, cooled naturally, washed, dried, and then the dried product was heat-treated at 550°C for 30h in a nitrogen atmosphere to obtain a particle A nitrogen-doped oxide with a diameter of 150 nm; wherein, the oxide is Li 0.12 B 0.96 PO 4 and copper oxide mixture.

[0100] (3) Preparation of carbon source C2 (nitrogen, phosphorus co-doped car...

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Abstract

The invention relates to a coated type lithium iron manganese phosphate positive electrode material and a preparation method and application thereof. Two different carbon sources are used for in-situ coating to prepare a coated type lithium iron manganese phosphate positive electrode material. Doping the lithium iron manganese phosphate cathode material with oxygen-containing compounds can effectively repair the lattice interface of the lithium iron manganese phosphate cathode material, prevent the dissolution of transition metal ions in the electrolyte, and enhance the cycle life and cycle life of the cathode material. stability and improve the electrochemical performance of the material. The obtained cathode material has high rate performance and good cycle stability. The specific discharge capacity of the coated cathode material is >148mAh / g at a rate of 5C, and the capacity retention rate after 1000 cycles is >92%, and the preparation process saves energy. It is simple and easy to operate, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, in particular to the technical field of preparation of positive electrode materials for lithium ion secondary batteries, and in particular relates to a coated lithium iron manganese phosphate positive electrode material and a preparation method and application thereof. Background technique [0002] The power battery is the key to the commercialization of new energy vehicles, and the cathode material, which accounts for about 35% of its total cost, is the key to its performance and the core technology for its replacement. [0003] Both lithium iron phosphate and lithium manganese phosphate are positive electrode materials for lithium-ion batteries with good development prospects. Among them, lithium iron phosphate has a lower voltage platform (3.4V), a lower energy density of the material (578Wh / kg), and poor low-temperature performance. However, lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/625Y02E60/10
Inventor 谭强强徐宇兴
Owner LANGFANG GREEN IND TECH CENT
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