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Mixed lithium battery positive material and preparation method thereof

A battery cathode and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cyclability, low compaction density, poor thermal stability, etc., and achieve low cost, high compaction density, The effect of increasing electrical conductivity

Inactive Publication Date: 2014-08-13
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to find a method for coating lithium nickel cobalt manganese oxide with lithium cobalt oxide, combining the advantages of the two to improve the low compaction density of lithium nickel cobalt manganese oxide and the mixed discharge of Li and Ni, resulting in cyclical changes. Poor problem, and improve the problem of poor thermal stability of lithium cobalt oxide under high voltage, obtain a lithium battery cathode material with high compaction density, high energy density, good cycle stability and low cost

Method used

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  • Mixed lithium battery positive material and preparation method thereof
  • Mixed lithium battery positive material and preparation method thereof
  • Mixed lithium battery positive material and preparation method thereof

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Effect test

specific Embodiment 1

[0021] A mixed lithium battery positive electrode material, the positive electrode material is a mixed reactant of cobalt oxide, a ternary precursor and a lithium salt; the molar ratio of the cobalt element in the cobalt oxide and the metal element in the ternary precursor is 1:1, The molar ratio of the cobalt oxide and the metal element in the mixture of the ternary precursor to the lithium element in the lithium salt is 1:1.05; after the cobalt oxide and the ternary precursor are fully ground, the lithium salt is added and mixed, and the Carrying out two-step sintering and sieving to obtain the positive electrode material, which is lithium cobalt manganate coated with lithium cobalt oxide, wherein the lithium cobalt manganese oxide particles are large, and the lithium cobalt oxide particles are small; the cobalt oxide is Co 3 o 4 ; The ternary precursor is (Ni 0.5 mn 0.3 co 0.2 )(OH) 2 ; The lithium salt is Li 2 CO 3 . Electron microscopy scanning was carried out to o...

specific Embodiment 2

[0027] A mixed lithium battery positive electrode material, the positive electrode material is a mixed reactant of cobalt oxide, a ternary precursor and a lithium salt; the molar ratio of the cobalt element in the cobalt oxide and the metal element in the ternary precursor is 0.5:1, The molar ratio of the cobalt oxide and the metal element in the mixture of the ternary precursor to the lithium element in the lithium salt is 1:1.05; after the cobalt oxide and the ternary precursor are fully ground, the lithium salt is added and mixed, and the Carrying out two-step sintering and sieving to obtain the positive electrode material, which is lithium cobalt manganate coated with lithium cobalt oxide, wherein the lithium cobalt manganese oxide particles are large, and the lithium cobalt oxide particles are small; the cobalt oxide is Co 3 o 4 ; The ternary precursor is (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 ; The lithium salt is Li 2 CO 3 .

[0028] Made by the following steps:

[0029]...

specific Embodiment 3

[0033] A mixed lithium battery positive electrode material, the positive electrode material is a mixed reactant of cobalt oxide, a ternary precursor and a lithium salt; the molar ratio of the cobalt element in the cobalt oxide and the metal element in the ternary precursor is 2:1, The molar ratio of the cobalt oxide and the metal element in the mixture of the ternary precursor to the lithium element in the lithium salt is 1:1.05; after the cobalt oxide and the ternary precursor are fully ground, the lithium salt is added and mixed, and the Carrying out two-step sintering and sieving to obtain the positive electrode material, which is lithium cobalt manganate coated with lithium cobalt oxide, wherein the lithium cobalt manganese oxide particles are large, and the lithium cobalt oxide particles are small; the cobalt oxide is Co 3 o 4 ; The ternary precursor is (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 ; The lithium salt is Li 2 CO 3 .

[0034] Made by the following steps:

[0035] (...

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Abstract

The invention belongs to the field of inorganic non-metallic materials and relates to a mixed lithium battery positive material and a preparation method thereof. The preparation method comprises the following steps: mixing cobalt oxide and a nickel-cobalt-manganese ternary material precursor, and performing two-step sintering, thereby directly obtaining a mixed positive material of lithium cobalt oxide and nickel cobalt lithium manganate, wherein a microscopic structure formed by coating nickel cobalt lithium manganate particles with lithium cobalt oxide particles is shown in the figure in the specification, and the diameter of the lithium cobalt oxide particles is less than that of the nickel cobalt lithium manganate particles. According to the structure that large and small spheres of lithium cobalt oxide and nickel cobalt lithium manganate are arranged in a mixed manner, gaps the material can be effectively filled, and the compaction density of the material is improved; the conductivity of the material can be improved after the material is coated with lithium cobalt oxide, dislocation of Li and Ni in a nickel cobalt lithium manganate crystal structure can be effectively alleviated, and decomposition of high-valence nickel ion catalytic electrolyte is inhibited; moreover, the compaction density of nickel cobalt lithium manganate can be improved after being coated with lithium cobalt oxide, so that the capacity, stability, high-current discharge capacity and rate performance of the battery in unit volume can be effectively improved.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a positive electrode material of a hybrid lithium battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are the latest generation of recyclable secondary batteries that have become popular and developed rapidly after nickel-cadmium batteries and nickel-hydrogen batteries. In today's energy shortage and environmental deterioration, lithium-ion batteries have high working voltage (3.6V, three times that of Ni / Cd and Ni / MH batteries), small size (30% smaller than Ni / MH batteries), and light weight. (50% lighter than Ni / MH batteries), no memory effect, high specific energy (180Wh / kg, 2 to 4 times that of Ni / Cd batteries, 1 to 2 times that of Ni / MH batteries), less environmental pollution, self- Low discharge rate (less than 10% per month), some systems can charge and discharge quickly, wide operating temperature range (–20°C ~ 60°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122H01M4/525H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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