A kind of doped manganese silicate lithium/carbon composite material and its preparation method

A technology of carbon composite materials and lithium manganese silicate, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of poor cycle stability, low energy density and poor conductivity of olivine-type lithium iron phosphate, and achieve electrochemical Excellent performance, improved electrochemical cycle stability, and favorable conductivity

Active Publication Date: 2019-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned several materials have different defects: layered transition metal oxides, spinel-type lithium manganate and olivine-type lithium iron phosphate have low energy density and poor conductivity
However, the characteristics of poor cycle stability, low electronic conductivity and low ion diffusivity severely restrict its electrochemical performance and hinder further research and production.

Method used

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  • A kind of doped manganese silicate lithium/carbon composite material and its preparation method
  • A kind of doped manganese silicate lithium/carbon composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: Dissolve 1.6 g of poloxamer F127 in 10 mL of absolute ethanol at 30° C. for use. Dissolve 0.01mol of tetraethyl silicate and 0.5mL of 0.2mol / L dilute hydrochloric acid solution in 1mL of water, stir for hydrolysis reaction until the solution is no longer separated, tetraethyl silicate is completely dissolved, the reaction time is about 30min, and then Add 0.01mol of manganese nitrate, 0.02mol of lithium nitrate and 0.03g of boric acid in molar ratio, stir for a period of time until the system is clarified, then add 2.5g of 20wt% phenolic resin aqueous solution to it, and form the sol with the poloxa prepared before Mix F127 ethanol sol, stir at 30°C for 1h to obtain a stable sol system, put the above sol system at 30°C for 12h to obtain a precursor gel, then treat the gel at 150°C for 24h in an air atmosphere, and grind to obtain Precursor powder;

[0017] Step 2: Heat the precursor powder prepared in Step 1 under the protection of argon atmosphere. The heat tr...

Embodiment 2

[0021] Step 1: Dissolve 1 g of poloxamer F127 in 10 mL of water at 30°C for use. Dissolve 0.01mol tetraethyl silicate and 1mL 0.2mol / L dilute nitric acid solution in 1mL water, adjust the pH of the system to stir and carry out the hydrolysis reaction until the solution no longer separates, tetraethyl silicate is completely dissolved, and the reaction time is about For 50min, then add 0.01mol manganese nitrate, 0.02mol lithium nitrate and 0.06g boric acid in molar ratio, stir for a period of time until the system is clear, then add 2.5g 20wt% phenolic resin aqueous solution to it, and the sol that forms is mixed with the previously prepared Poloxamer F127 water sol was mixed, stirred at 30°C for 1 hour to obtain a stable sol system, and the above sol system was left to stand at 30°C for 12 hours to obtain a precursor gel, and then the gel was treated at 150°C for 24 hours in an air atmosphere. Grinding to obtain precursor powder;

[0022] Step 2: Heat the precursor powder prep...

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Abstract

The invention provides a doped lithium silicon manganese / carbon composite material and a preparation method thereof. A boron element is doped in the material, the carbon accounts for 5-20% of the total mass of the material, the material is an orthorhombic crystal system, and a lattice constant b value is larger than 5.4027A-<0>. A precursor material is obtained basically by a sol-gel method, the material is obtained by thermal processing on the precursor material, and a boron compound is added during the preparation process of sol. Compared with the prior art, the boron doped lithium silicon manganese / carbon composite positive electrode material prepared according to the method has the advantages that boron polyanions are doped in lithium silicon manganese, so that a lattice structure preferentially grows, and the electrochemical cycle stability of quasi-layered material lithium silicon manganese can be substantially improved due to a strut effect of the boron polyanions.

Description

technical field [0001] The invention relates to a manganese lithium silicate material and a preparation method thereof, in particular to a doped manganese lithium silicate / carbon composite material and a preparation method thereof. Background technique [0002] The performance of lithium-ion batteries largely depends on the choice of cathode materials. The cathode materials currently used in lithium-ion batteries mainly include layered transition metal oxides (LiMO 2 ), spinel lithium manganate (LiMn 2 o 4 ) and olivine-type lithium iron phosphate (LiFePO 4 ). The above-mentioned several materials have different defects: layered transition metal oxides, spinel-type lithium manganate and olivine-type lithium iron phosphate have low energy density and poor conductivity. Research on cathode materials for lithium-ion batteries with high energy density, good safety, environmental friendliness and low cost has become a current research hotspot in this field. [0003] Lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/36H01M10/0525
CPCH01M4/364H01M4/505H01M10/0525Y02E60/10
Inventor 韦伟峰冀然丁正平冯伊铭
Owner CENT SOUTH UNIV
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