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Method for preparing lithium manganese phosphate nano-cluster

A lithium manganese phosphate and nano-cluster technology is applied in the field of positive electrode materials of lithium ion batteries, which can solve the problems of unfavorable lithium ion battery energy density, poor high temperature cycle performance, difficult stoichiometric ratio, etc., and achieves favorable lithium ion diffusion and cost. Low, pollution-free effect

Inactive Publication Date: 2014-04-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiCoO 2 It has been commercialized, but in addition to the constraints of cobalt resources, its unsafe overcharge determines that it cannot be applied in large-capacity batteries; LiNiO 2 It is difficult to exist in a stable stoichiometric ratio, so the synthesis is relatively difficult; LiMn 2 o 4 Due to its low cost and relative LiCoO 2 The advantages of safety play a role in large-capacity batteries, but a good solution has not been found for its shortcomings of low capacity and poor high-temperature cycle performance, so it still cannot be promoted in actual batteries
At present, the microscopic morphology of lithium manganese phosphate prepared in the laboratory is concentrated in diamond-shaped block and spherical shapes, which are not conducive to improving the energy density of lithium-ion batteries.

Method used

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  • Method for preparing lithium manganese phosphate nano-cluster

Examples

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Embodiment 1

[0014] Weigh 2.2058g of manganese acetate tetrahydrate and dissolve it in 15mL of ethylene glycol and stir for 0.5h, add 0.6g of polyvinylpyrrolidone and stir for 1h to obtain manganese acetate solution A in polyvinylpyrrolidone. Another weighed 0.378g of lithium hydroxide monohydrate was dissolved in 15mL of ethylene glycol and stirred for 0.5h to obtain solution B. Add solution B to solution A and stir for 0.5h to obtain a mixed solution. Finally, add Stir 1.038g of phosphoric acid with a mass concentration of 85% for 1 hour to obtain a precursor solution, then transfer it to a polytetrafluoroethylene reaction kettle, seal it, keep it at 200°C for 16 hours, then cool it down to room temperature, take out the resulting solution, and filter it out. After the supernatant is obtained, add deionized water for ultrasonic oscillation, and then use a centrifuge to centrifuge at a speed of 10,000 rpm for 10 minutes. After filtering off the supernatant, add deionized water again and os...

Embodiment 2

[0017] Weigh 2.2058g of manganese acetate tetrahydrate, dissolve it in 15mL of ethylene glycol and stir for 0.5h, add 0.2g of polyvinylpyrrolidone and stir for 1h to obtain manganese acetate solution A in polyvinylpyrrolidone. Another weighed 0.378g of lithium hydroxide monohydrate was dissolved in 15mL of ethylene glycol and stirred for 0.5h to obtain solution B. Add solution B to solution A and stir for 0.5h to obtain a mixed solution. Finally, add Stir 1.038g of phosphoric acid with a mass concentration of 85% for 1 hour to obtain a precursor solution, then transfer it to a polytetrafluoroethylene reaction kettle, seal it, keep it at 200°C for 16 hours, then cool it down to room temperature, take out the resulting solution, and filter it out. After the supernatant is obtained, add deionized water for ultrasonic oscillation, and then use a centrifuge to centrifuge at a speed of 10,000 rpm for 10 minutes. After filtering off the supernatant, add deionized water again and oscil...

Embodiment 3

[0019] Weigh 2.2058g of manganese acetate tetrahydrate and dissolve it in 15mL of ethylene glycol and stir for 0.5h, add 0.4g of polyvinylpyrrolidone and stir for 1h to obtain manganese acetate solution A in polyvinylpyrrolidone. Another weighed 0.378g of lithium hydroxide monohydrate was dissolved in 15mL of ethylene glycol and stirred for 0.5h to obtain solution B. Add solution B to solution A and stir for 0.5h to obtain a mixed solution. Finally, add Stir 1.038g of phosphoric acid with a mass concentration of 85% for 1 hour to obtain a precursor solution, then transfer it to a polytetrafluoroethylene reaction kettle, seal it, keep it at 200°C for 16 hours, then cool it down to room temperature, take out the resulting solution, and filter it out. After the supernatant is obtained, add deionized water for ultrasonic oscillation, and then use a centrifuge to centrifuge at a speed of 10,000 rpm for 10 minutes. After filtering off the supernatant, add deionized water again and os...

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Abstract

The invention discloses a method for preparing a lithium manganese phosphate nano-cluster and belongs to the technical field of anode materials of lithium ion batteries. The method comprises the following steps: dissolving manganese sulfate or manganese acetate and polyvinylpyrrolidone in polyhydric alcohols to prepare a solution A; dissolving lithium hydroxide or lithium acetate in the polyhydric alcohols to prepare a solution B, dripping the solution B into the solution A to prepare a precursor solution of lithium salts and manganese salts; adding a solution obtained by phosphoric acid into the precursor solution, carrying out a solvothermal reaction, and performing post-treatment to obtain the lithium manganese phosphate nano-cluster. The method has the advantages that the product is stable in quality, high in purity and high in dispersing property, and lithium ion diffusion is promoted, so that the high-current charging and discharging performance of the lithium ion battery is improved. Moreover, the preparation process is simple in process, easy to control, pollution-free, low in cost and easy for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of lithium manganese phosphate nanoclusters, belonging to the technical field of cathode materials for lithium ion batteries. Background technique [0002] Lithium-ion battery, as a high-performance rechargeable green power source, has been widely used in various portable electronic products and communication tools in recent years, and has been gradually developed as a power source for electric vehicles, thereby promoting its development towards safety, environmental protection, Development in the direction of low cost and high specific energy. Among them, the development of new electrode materials, especially positive electrode materials, is extremely critical. At present, the widely researched lithium-ion battery cathode materials focus on some transition metal oxides, such as LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Wait. LiCoO 2 It has been commercialized, but in addition to the constraints of cobalt re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45B82Y30/00
CPCB82Y40/00C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 李家俊王毅赵乃勤师春生何春年刘恩佐
Owner TIANJIN UNIV
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