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Lithium manganese phosphate clad lithium-rich layered oxide cathode material as well as preparation and application thereof

A cathode material and oxide technology, applied in the field of lithium-rich cathode materials and their preparation, achieves the effects of high specific capacity, good rate performance and simple preparation process

Active Publication Date: 2013-04-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prior to this, LiMnPO has not been used 4 A report on coating lithium-rich oxides

Method used

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  • Lithium manganese phosphate clad lithium-rich layered oxide cathode material as well as preparation and application thereof
  • Lithium manganese phosphate clad lithium-rich layered oxide cathode material as well as preparation and application thereof
  • Lithium manganese phosphate clad lithium-rich layered oxide cathode material as well as preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Lithium-rich cathode material Li[Li 0.17 Ni 0.25 mn 0.58 ]O 2 Preparation: Weigh LiOH·H 2 O (excess 8%) 2.644 grams, Ni (CH 3 COO) 2 2H 2 O 3.111 g, Mn(CH 3 COO) 2 2H 2 0.7.148 grams, be mixed with 200 milliliters of metal ion total concentration and be the aqueous solution of 0.52 mol / liter, add the citric acid of 200 milliliters of 1.0 mol / liter then, add ammoniacal liquor (massfraction 25%), the pH of mixed solution is adjusted to 9, Stir evenly; inject the above solution into a spray dryer for spray drying to obtain a uniformly mixed precursor; grind the obtained precursor into powder, transfer it to a crucible, and roast at 480°C for 5 hours. After cooling, grind the material ; Then place the ground material in a muffle furnace and sinter at a high temperature of 850°C for 10 hours to obtain Li[Li 0.17 Ni 0.25 mn 0.58 ]O 2 .

[0027] 2) LiMnPO 4 Coated Li[Li 0.17 Ni 0.25 mn 0.58 ]O 2 Preparation: Take the Li[Li prepared in step 1) 0.17 Ni 0....

Embodiment 2

[0030] Change the calcination temperature 400 DEG C in step 2) in embodiment 1 to 500 DEG C, and others are the same as embodiment 1. Electrochemical performance tests such as Figure 4 As shown, at a current density of 30 mA / g, the coated LiMnPO 4 The discharge capacity of the latter material after 80 weeks is 260.8 mAh / g, and the cycle performance has been significantly improved.

Embodiment 3

[0032] With the LiMnPO in step 2) in embodiment 1 4 with Li[Li 0.17 Ni 0.25 mn 0.58 ]O 2 Mass ratio control is 7wt%, other is the same as embodiment 1. Figure 5 Shown at a current density of 30 mA / g, the material in LiMnPO 4 The first cycle charge and discharge curves before and after coating, it can be seen from the figure that the initial discharge specific capacity of the material after coating has also been improved.

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Abstract

The invention relates to a LiMnPO4 clad lithium-rich layered oxide Li[Li(1-2x) / 3MxMn(2-x) / 3]O2 (M is at least one of Ni or Co, wherein x is more than 0 and not less than 0.33) and a preparation method thereof. The Li[Li(1-2x) / 3MxMn(2-x) / 3]O2 is dipped in water solution containing Li, Mn and PO43- (the mol ratio is 1: 1: 1), is continuously stirred for 3-8 hours in an opening container at the temperature of 60-90 DEG C to prepare solid powder, then is dried for 2-24 hours at the temperature of 100 DEG C, and is roasted for 5-10 hours at the temperature of 300-600 DEG C to prepare the LiMnPO4 clad lithium-rich layered oxide Li[Li(1-2x) / 3MxMn(2-x) / 3]O2 cathode material, wherein the mass ratio of the LiMnPO4 to the Li[Li(1-2x) / 3MxMn(2-x) / 3]O2 is 3-10 wt%. The electrode material prepared by the method has the characteristics of high electrochemical capacity, good circulating stability, excellent rate capacity and the like, and has the advantages of simple preparation process, low cost and good reproducibility.

Description

technical field [0001] The present invention relates to a kind of LiMnPO for lithium ion battery 4 Coated lithium-rich cathode material and preparation method thereof, specifically lithium manganese phosphate (LiMnPO 4 ) coated lithium-rich layered oxide Li[Li (1-2x) / 3 m x mn (2-x) / 3 ]O 2 And its preparation method and application. Background technique [0002] In recent years, with the advancement of science and technology, the requirements for energy storage devices in the fields of electronic products, electric vehicles, and medical equipment have been increasing, and the development of lithium-ion batteries with high energy density, small size, and long cycle life has become a trend. As the core part of lithium-ion batteries, cathode materials play a vital role. Traditional cathode material LiCoO 2 Low capacity and high cost; while LiNiO 2 The synthesis conditions are harsh and the reversibility is poor; LiMn is relatively cheap 2 o 4 and LiFePO 4 Discharge sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/58H01M4/525H01M4/131H01M10/0525
CPCY02E60/10
Inventor 高学平乔齐齐李国然叶世海
Owner NANKAI UNIV
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