Carbon-coated ferrous lithium silicate anode material, as well as preparation method and application thereof

A technology of lithium ferrous silicate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problem that it is difficult to obtain a uniform bivalent lithium iron silicate material, and the performance of the battery is not too high. Good, strong corrosion of ferric nitrate and other issues, to achieve superior high-rate performance and cycle performance, superior high-rate performance, low cost effect

Active Publication Date: 2014-04-23
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of ferric iron, on the one hand, it is difficult to obtain a homogeneous bivalent lithium iron silicate material, resulting in poor battery performance, especially the rate performance; on the other hand, the raw material ferric nitrate is highly corrosive , which requires higher preparation equipment and increases the cost

Method used

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  • Carbon-coated ferrous lithium silicate anode material, as well as preparation method and application thereof
  • Carbon-coated ferrous lithium silicate anode material, as well as preparation method and application thereof
  • Carbon-coated ferrous lithium silicate anode material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 0.02mol of iron powder and 0.02mol of citric acid into 60ml of deionized water, stir magnetically at a constant temperature of 60°C until the iron powder is completely dissolved into a dark green transparent solution; add 0.02mol of lithium carbonate and 0.02mol of Dissolve citric acid in 60mL of deionized water, stir magnetically for 2h at room temperature; disperse 0.02mol of nano-silica in 30ml of deionized water, and disperse ultrasonically for 2h; mix the above three solutions, stir well at room temperature for 4h to obtain dispersion Uniform solution; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 80°C to obtain a precursor; the above precursor was pre-decomposed at 220°C for 16 hours; the pre-decomposed product was moved into a high-temperature atmosphere furnace, protected by argon or nitrogen After sintering at 600°C for 4 hours, and cooling to room temperature with the furnace, a single-phase and uniform car...

Embodiment 2

[0055] Add 0.02mol of iron powder and 0.02mol of ascorbic acid into 60ml of deionized water, stir magnetically at a constant temperature of 60°C until the iron powder is completely dissolved into a dark green transparent solution; add 0.02mol of lithium hydroxide and 0.02mol of Dissolve ascorbic acid in 60mL deionized water, stir magnetically for 2h at room temperature; disperse 0.02mol nano-silica in 30ml deionized water, and disperse ultrasonically for 2h; mix the above three solutions, stir well at room temperature for 4h to obtain uniform dispersion solution; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 60°C to obtain a precursor; the above precursor was pre-decomposed at 200°C for 20 hours; the pre-decomposed product was moved into a high-temperature atmosphere furnace, under the protection of argon or nitrogen After sintering at 600°C for 4 hours, and cooling to room temperature with the furnace, a single-phase and unifo...

Embodiment 3

[0057] Add 0.02mol of iron powder and 0.02mol of formic acid into 60ml of deionized water, stir magnetically at a constant temperature of 60°C until the iron powder is completely dissolved into a dark green transparent solution; add 0.02mol of lithium acetate and 0.02mol of formic acid Dissolve in 60mL of deionized water, stir magnetically for 2h at room temperature; disperse 0.02mol of nano-silica in 30ml of deionized water, and disperse ultrasonically for 2h; mix the above three solutions, stir thoroughly at room temperature for 4h to obtain a uniformly dispersed solution; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 100°C to obtain a precursor; the above precursor was pre-decomposed at 260°C for 6 hours; the pre-decomposed product was moved into a high-temperature atmosphere furnace, and placed in After sintering at 600°C for 4 hours, and cooling to room temperature with the furnace, a single-phase and uniform carbon-coated...

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Abstract

The invention discloses a sol-gel preparation method for carbon-coated ferrous lithium silicate of a lithium ion battery cathode material. According to the method, nano-silica serves as a template, and high-performance carbon-coated ferrous lithium silicate cathode material is further synthesized by a sol-gel method. The synthesized material has high purity, no impurity phase, and high particle uniformity; the particle size is between 20 and 50 nm; the weight percentage of carbon is 8 to 16 percent; under the multiplying power of C / 10, the primary discharge capacity is 190 mAh / g; under the multiplying power of 1 C, the primary discharge capacity is 132 mAh / g, and the specific capacity is 130 mAh / g after 100 cycles; under the multiplying power of 100 C, the discharge capacity is 42 mAh / g; high cycling performance and high power performance are embodied, and the requirements on actual application of the lithium ion battery can be met.

Description

technical field [0001] The invention relates to a preparation method of a high-purity carbon-coated lithium ferrous silicate positive electrode material, and the carbon-coated lithium ferrous silicate obtained by the method and its application. Background technique [0002] Due to the advantages of high working voltage, high specific energy, high specific power, long cycle life, small self-discharge, and no memory effect, rechargeable lithium-ion batteries have been widely used in portable electronic devices, power tools, energy storage devices, electric vehicles and hybrid electric vehicles. Compared with traditional lithium-ion oxide batteries (LiMn 2 o 4 , LiCoO 2 , and LiNiO 2 ), polyanionic compound cathode materials have been widely studied due to their advantages of good safety performance, low cost, and no pollution. Li 2 FeSiO 4 As a new polyanion compound lithium-ion battery cathode material, it has the characteristics of high theoretical specific capacity, ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCY02E60/122H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 海晓褚卫国王汉夫
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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