Preparation method of high-capacity lithium-rich anode material

A cathode material and lithium salt technology, which is applied in the field of high-capacity lithium-rich cathode materials and their preparation, can solve the problems of insufficient compactness, large specific surface area of ​​materials, and uneven sintering of materials.

Inactive Publication Date: 2015-12-02
INST OF CHEM CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material obtained by the sol-gel method has a large specific surface area and poor cycle stability.
However, the precursors synthesized by the co-precipitation method are rough and not dense enough in the subsequent calcination at high temperature, and the problem of uneven sintering of materials is prone to occur in the mass sintering process, so the obtained materials have low capacity and irreversible capacity. Large, and there is an activation process in the material during charge and discharge

Method used

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  • Preparation method of high-capacity lithium-rich anode material
  • Preparation method of high-capacity lithium-rich anode material
  • Preparation method of high-capacity lithium-rich anode material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0022] Example 1. Preparation of high-capacity lithium-rich cathode material

[0023] The precursor was nickel sulfate hexahydrate (NiSO 4 .6H 2 O), manganese sulfate pentahydrate (MnSO 4 .5H 2 O), cobalt sulfate heptahydrate (CoSO 4 .7H 2 O) be made into 2M transition metal solution, with 2M sodium carbonate (Na 2 CO 3 ) as a precipitant, 0.2M ammonia water as a buffer, and obtained after co-precipitation at 60° C., pH=7-8, washing, filtering and drying. The precursor obtained above was pre-sintered in a muffle furnace, raised to 500°C at a rate of 5°C / min in an air atmosphere, kept at a constant temperature for 5h, and then naturally cooled to room temperature to obtain an intermediate. The number of moles of transition metals in the above intermediates is denoted as M 1 , then the intermediate is mixed with lithium carbonate and molten salt sodium chloride in molar ratio M 1 :Li:Na=1:1.5:2 mixed evenly, and sintered again under air atmosphere. The sintering steps ...

Embodiment 2

[0031] Other conditions are identical with embodiment 1, and difference is the mol ratio of intermediate obtained in step 1) and sodium chloride, i.e. M 1 : Li:Na=1:1.5:4, wherein M is a transition metal element. The positive and negative terminals of the button battery. Electrolyte solution and battery assembly are identical with embodiment 1, and gained lithium-rich positive electrode material is at 0.05C (corresponding to 12.5mAg -1 ) is shown in Table 1 for the first cycle charge and discharge capacity. The material is at 0.05C (equivalent to 12.5mAg -1 ) rate, the voltage range is 2-4.7V, the test temperature is 25°C, and the specific discharge capacity is 270mAhg -1 , Coulombic efficiency is 87%. Compared with Example 1, the specific capacity is slightly worse.

Embodiment 3

[0033] Other conditions are identical with embodiment 1, and difference is the mol ratio of intermediate obtained in step 1) and sodium chloride, i.e. M 1 : Li:Na=1:1.5:6, wherein M is a transition metal element. The positive pole, negative pole, electrolyte and battery assembly of button cell are identical with embodiment 1, and gained lithium-rich positive electrode material is at 0.05C (corresponding to 12.5mAg -1 ) rate of the first cycle charge and discharge capacity shown in Table 1. The material is at 0.05C (equivalent to 12.5mAg -1 ) rate, the voltage range is 2-4.7V, the test temperature is 25°C, and the specific discharge capacity is 266mAhg -1, Coulombic efficiency is 85%.

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Abstract

The invention discloses a preparation method of a high-capacity lithium-rich anode material. According to the method, a material precursor, lithium salt and alkali metal or alkaline-earth metal molten salt are calcined at certain temperature according to a certain sequence and ratio, and then the high-capacity lithium-rich anode material is obtained. The obtained lithium-rich anode material is smooth and dense in particle surface and excellent in electrochemical performance, and has the advantages of being high in discharge capacity, low in irreversible capacity, stable in circulation and the like. The method is simple in technological condition, raw materials are cheap, growth of crystal particles of the lithium-rich anode material is controlled through the molten salt, and meanwhile the problem of non-uniform sintering in the sintering process and especially the large-scale sintering process of the material is solved. High practicality is achieved, and the preparation method is suitable for mass production.

Description

technical field [0001] The invention relates to an electrode material, in particular to a high-capacity lithium-rich cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones due to their light weight, small size, high energy density, small self-discharge, good cycle performance, and long service life. In recent years, in order to relieve environmental pressure, electric vehicles and hybrid electric vehicles based on high-performance secondary batteries have been developed by countries all over the world. [0003] Currently commercialized mainly include lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4) and ternary cathode materials. However, in lithium cobalt oxide, cobalt resources are expensive and toxic, and there are safety problems; lithium manganese oxide has a low specific capacity; although lithium iron ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M2004/028Y02E60/10
Inventor 郭玉国卿任鹏石吉磊张旭东殷雅侠张君楠张亚利张风太
Owner INST OF CHEM CHINESE ACAD OF SCI
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