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Method for preparing carbon aerogel cladded LiMnPo4/C

A carbon airgel and coating technology, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of low output of microwave and hydrothermal methods, long synthesis time, low heat utilization rate, etc., and achieve cycle performance Good, inexpensive, high specific surface area effect

Inactive Publication Date: 2012-11-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About LiMnPO 4 The research of solid-phase synthesis method is relatively early, but its synthesis method takes a long time, low heat utilization rate, uneven particles and prone to manganese impurity phase.
LiMnPO 4 The microwave method and hydrothermal method are difficult to carry out industrial production because of their shortcomings such as small output.

Method used

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  • Method for preparing carbon aerogel cladded LiMnPo4/C
  • Method for preparing carbon aerogel cladded LiMnPo4/C
  • Method for preparing carbon aerogel cladded LiMnPo4/C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 0.02 mol of resorcinol, 0.2 mol of lithium hydroxide, 0.2 mol of ammonium dihydrogen phosphate, prepare a solution, add to the solution prepared by 0.04 mol of formaldehyde solution and 0.2 mol of manganese carbonate, add 0.002 mol of organic Catalyst citric acid. The mixed solution was stirred at a constant temperature of 80°C for 6 hours, and the pH value was adjusted to about 8.9 with ammonia water, and stirred until a gel was formed;

[0033] 2) The obtained gel was vacuum-dried at 150° C. for 3 hours, and the solvent was evaporated to obtain a dry gel; then, it was ball-milled on a planetary ball mill for 6 hours at a speed of 600 r / min. After fully grinding, it is calcined at 700°C for 10 hours under the protection of reducing atmosphere, and the gas flow rate is 0.1-10L / min. After cooling down to room temperature, LiMnPO coated with carbon airgel can be obtained. 4 / C Composite.

[0034] The composite material prepared by the above method was used to ...

Embodiment 2

[0037] 1) Weigh 0.1mol resorcinol, 0.2mol lithium oxalate, and 0.2mol ammonium dihydrogen phosphate to prepare a solution, add it to the solution prepared by 0.2mol acetaldehyde solution and 0.2mol manganese oxalate, add 0.002mol organic Catalyst tartaric acid. The mixed solution was stirred at a constant temperature of 70°C for 8 hours, and the pH value was adjusted to about 6.0 with ammonia water, and stirred until a gel was formed;

[0038] 2) The prepared gel was vacuum-dried at 140° C. for 3.5 hours, and the solvent was evaporated to obtain a dry gel; then, it was ball-milled on a planetary ball mill for 5 hours at a speed of 700 r / min. After fully grinding, it is calcined at 650°C for 11 hours under the protection of reducing atmosphere, and the gas flow rate is 0.1-10L / min. After cooling down to room temperature, LiMnPO coated with carbon airgel can be obtained. 4 / C Composite.

[0039] Electrodes were fabricated according to the method steps in Example 1, and batter...

Embodiment 3

[0041]1) Weigh 0.04mol catechol, 0.1mol lithium carbonate, and 0.2mol ammonium dihydrogen phosphate, prepare a solution, add to the solution prepared by 0.08mol formaldehyde solution and 0.2mol manganese sulfate, add 0.0002mol organic catalyst DL-malic acid. Stir the mixed solution at a constant temperature of 65°C for 14 hours, adjust the pH value to about 6.5 with ammonia water, and stir until a gel is formed;

[0042] 2) The obtained gel was vacuum-dried at 150° C. for 3 hours, and then the solvent was evaporated to obtain a dry gel; then, it was ball-milled on a planetary ball mill for 10 hours at a speed of 400 r / min. After fully grinding, it is calcined at 750°C for 8 hours under the protection of reducing atmosphere, and the gas flow rate is 0.1-10L / min. After cooling down to room temperature, LiMnPO coated with carbon airgel can be obtained. 4 / C Composite.

[0043] Electrodes were manufactured according to the method steps in Example 1, and battery assembly and cha...

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Abstract

The invention discloses a method for preparing a carbon aerogel cladded lithium ion battery anode material LiMnPo4 / C, which takes lithium salt, manganate, phosphate, polyphenol compounds and aldehyde compounds as raw materials and comprises the preparation of gel and drying, ball-milling and calcining processes. The method is characterized in that: the preparation of the gel comprises the steps of adding solution prepared from the polyphenol compounds, lithium salt and the phosphate according to a ratio into solution prepared from the aldehyde compounds and the manganate according to a ratio,adding a catalyst into the mixed solution, stirring at a constant temperature to obtain sol, heating and drying to obtain dry gel, and the LiMnPo4 / C can be prepared by ball milling the dry gel and calcining the milled product for a certain time period at a constant temperature in the reducing atmosphere. The method the advantages that: the synthesis speed is high; and the composite has high discharge capacity at a high rate, a high voltage level, a stable structure, high circulation performance, contains no heavy metal and is an environmentally-friendly material.

Description

1. Technical field [0001] The invention relates to a preparation method of a lithium-ion battery composite positive electrode material, in particular to a carbon airgel-coated lithium-ion battery composite positive electrode material LiMnPO 4 / C preparation method. 2. Technical Background [0002] LiMnPO with olivine structure 4 Capable of intercalating and extracting lithium ions reversibly, it is considered to be one of the alternative electrode materials for lithium-ion batteries. The research shows that the material has the following advantages: cheap raw materials, no heavy metals, rich resources, and environmental friendliness; high working voltage (4.1V), good platform characteristics; large theoretical capacity, stable structure, good safety performance; high temperature performance and cycle Good performance; good compatibility with most electrolyte systems and good storage performance. [0003] Preparation of LiMnPO 4 The methods mainly include solid-phase meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 李学良王凯肖正辉罗梅李瀚星
Owner HEFEI UNIV OF TECH
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