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Modified positive electrode material of lithium ion battery and preparation method of modified positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity, limited low-temperature and high-current charge and discharge capabilities, and poor material cycle performance, so as to increase specific capacity and improve Effects of charge and discharge efficiency, improvement of electrical conductivity and surface properties

Inactive Publication Date: 2012-10-17
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of the material (conductivity is only 10 -8 S / cm), resulting in poor low-temperature and high-current charge-discharge performance, which cannot fully meet the needs of electric vehicles for rapid charge-discharge and low-temperature environment use.
Other materials such as lithium vanadium phosphate Li 3 V 2 (PO 4 ) 3 , composite layered cathode material xLi 2 MnO 3 (1-x)LiMO 2 (where M=Mn, Ni, Co, Fe, etc.), etc., all have defects such as poor conductivity, which seriously limits its low temperature and high current charge and discharge capabilities
In addition, spinel lithium manganese oxide (LiMn 2 o 4 ) cathode material, due to Mn 3+ The dissolution of ions in the electrolyte and the lattice distortion during charge and discharge lead to poor cycle performance of the material
These defects largely limit the large-scale application of lithium-ion batteries

Method used

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  • Modified positive electrode material of lithium ion battery and preparation method of modified positive electrode material

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Embodiment 1

[0019] Using ferrous oxalate, lithium carbonate, ammonium dihydrogen phosphate, lanthanum oxide, and titanium dioxide as raw materials, the composition of the positive electrode material of the modified lithium ion battery obtained is LiFePO 4 0.02La 0.57 Li 0.3 TiO 3 The stoichiometric ratio for batching. After ball milling, keep the temperature at 800° C. for 8 hours in a nitrogen atmosphere. Then with LiFePO 4 0.02La 0.57 Li 0.3 TiO 3 as the matrix, La 0.57 Li 0.3 TiO 3 Coated on the surface of its particles, LiFePO 4 and La 0.57 Li 0.3 TiO 3 The molar ratio is 1:0.03.

Embodiment 2

[0023] Using ammonium metavanadate, oxalic acid, lithium hydroxide, ammonium dihydrogen phosphate, lanthanum oxide, strontium nitrate, and titanium dioxide as raw materials, the composition of the positive electrode material of the modified lithium ion battery obtained is Li 3 V 2 (PO 4 ) 3 0.03La 0.475 Li 0.475 Sr 0.05 TiO 3 The stoichiometric ratio for batching. After ball milling, keep the temperature at 850° C. for 6 hours in a nitrogen atmosphere.

Embodiment 3

[0027] Take LiMn 2 o 4 as the matrix, Li 1.4 In 0.4 Ti 1.6 P 3 o 12 Coated on the surface of its particles, LiMn 2 o 4 and Li 1.4 In 0.4 Ti 1.6 P 3 o 12The molar ratio is 1:0.06.

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Abstract

The invention discloses a modified positive electrode material of a lithium ion battery and a preparation method of the modified positive electrode material. The modified positive electrode material is characterized in that the modified positive electrode material is made of a lithium fast ion conductor and a positive electrode material of lithium ion battery at a molar ratio of n:1, wherein n is larger than 0 and not larger than 0.15. The invention also discloses the preparation method of the modified positive electrode material of the lithium ion battery. The modified positive electrode material provided by the invention is improved in conductivity property performance and surface properties, thereby enhancing the specific volume of the lithium ion battery, and improving the charging-discharging efficiency, rate capacity, cycling performance and temperature adaptability of the lithium ion battery.

Description

technical field [0001] The invention relates to a modification method of a lithium ion battery cathode material, in particular to a lithium ion battery cathode material modified with a lithium fast ion conductor phase and a preparation method thereof. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is one of the positive electrode materials commonly used in power batteries. It has the advantages of good structural stability, long cycle life, relative safety, low raw material prices, and non-toxicity. However, due to the poor conductivity of the material (conductivity is only 10 -8 S / cm), resulting in poor low-temperature and high-current charge-discharge performance, which cannot fully meet the needs of electric vehicles for rapid charge-discharge and low-temperature environment use. Other materials such as lithium vanadium phosphate Li 3 V 2 (PO 4 ) 3 , composite layered cathode material xLi 2 MnO 3 (1-x)LiMO 2 (where M=Mn, Ni, Co, Fe, etc.), etc.,...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 尹艳红曹朝霞岳红云张会双杨书廷
Owner HENAN NORMAL UNIV
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