Nanometer phosphate ferrolithium/carbon composite materials, production of solid-phase and use thereof

A lithium iron phosphate and carbon composite material technology, applied in the directions of phosphates, phosphorus oxyacids, lithium compounds, etc., can solve the problems of large product particles and high process costs, and achieve a simplified preparation process, excellent rate performance, and good electrical properties. Effects of chemical properties

Inactive Publication Date: 2007-12-19
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the common particle refinement methods include co-precipitation method, sol-gel method, etc. However, the process cost of these methods is relatively high
The high-temperature solid-state method is a relatively simple and inexpensive LiFePO 4 The preparation process, but the obtained product has large particles, and there is a contradictory relationship between the two

Method used

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  • Nanometer phosphate ferrolithium/carbon composite materials, production of solid-phase and use thereof
  • Nanometer phosphate ferrolithium/carbon composite materials, production of solid-phase and use thereof
  • Nanometer phosphate ferrolithium/carbon composite materials, production of solid-phase and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Chemically pure FeC 2 o 4 ·H 2 O, NH 4 h 2 PO 4 , LiOH·H 2 O is the raw material, according to the proportion of 1:1:1 ingredients, first LiOH·H 2 O and NH 4 h 2 PO 4 Mix for 2 hours before adding FeC 2 o 4 ·H 2 After O was mixed for 2 hours, β-cyclodextrin was added, and β-cyclodextrin was used as the carbon source precursor, and the amount added was to decompose β-cyclodextrin with a carbon content of 5 wt%. Ball mill mixing time 4h. The homogeneously mixed slurry was dried under natural conditions for 5 hours until the ethanol volatilized completely. The dried slurry is treated in a program-controlled horizontal furnace with a two-stage high-temperature solid-phase method, and inert gas protection is always used during the treatment process. The heating rate is 5°C / min. First, the temperature is raised to 300°C, and the temperature is kept for 6 hours; it is taken out and ground for 2 hours, and then placed in a horizontal furnace, the temperature is ra...

Embodiment 2

[0041] Chemically pure FeC 2 o 4 ·H 2 O, NH 4 h 2 PO 4 , LiOH·H 2 O is the raw material, and it is mixed evenly in a ball mill tank at a ratio of 1:1:1, and cyclodextrin with a decomposed carbon content of 5 wt% is added as a carbon source precursor, and the ball milling time is 4 hours. The uniformly mixed slurry was dispersed under 50KHz ultrasonic frequency for 6 hours; then dried under natural conditions for 5 hours until the ethanol volatilized completely. All the other processing conditions are exactly the same as in Example 1. Obtained LiFePO 4 The discharge specific capacity of the / C composite is 153mAh / g at 0.1C. Its particle size is shown in Figures 2 and 3, and the particle size is 200-500 nm.

Embodiment 3

[0043] Replace ferrous oxalate with ferrous acetate, and use Li 2 CO 3 , mix the raw materials in the ratio of Li:Fe:P 1.05:1:1, use Ar+H 2 (volume ratio 95:5) mixed atmosphere protection. All the other are with embodiment 2. Obtained LiFePO 4 The discharge specific capacity of the / C composite is 146mAh / g at 0.1C.

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Abstract

The invention takes LiFeO4 as matrix, and uses sub-particle carbon powder to cover its surface and to fill into space between LiFeO4 particles. Grain size is 200-500um. The weight ration of carbon in composite material is 2-10%. The process of preparation feature ultrasonic wave crash and solid state reaction. The said lithium salt is FeC2O4íñH2O, and the phosphate is NH4H2PO4.

Description

technical field [0001] The present invention relates to a kind of nanoscale particles, lithium ferrous phosphate / carbon (hereinafter abbreviated as LiFePO) with excellent discharge performance 4 / C) Composite material and its simple high-temperature solid-phase preparation method. The LiFePO 4 / C composites compared to pure LiFePO 4 The material has the advantages of small particles, high discharge specific capacity, excellent cycle performance and good rate performance. It belongs to the field of lithium-ion batteries. technical background [0002] LiCoO is currently widely used as the cathode material for lithium-ion batteries 2 Due to the high price and lack of resources, it is urgent to find new cathode materials to replace them. LiNiO with great application prospects 2 and LiMn 2 o 4 Although the system has its own advantages, however, due to the LiNiO 2 Synthesis difficulties, poor cycle performance and thermal stability seriously affect its practical progress...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01B25/26C01G49/00
CPCY02E60/12Y02E60/10
Inventor 赖春艳解晶莹王可
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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