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Composite cathode material for lithium ion batteries and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. The effect of lithium ion conduction rate, increasing specific capacity, and reducing impedance

Inactive Publication Date: 2018-01-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] In view of the above problems or deficiencies, in order to solve the existing Li 3 V 2 (PO 4 ) 3 The material has the technical problems of low electronic conductivity and low lithium ion conduction rate. The invention provides a lithium ion battery composite positive electrode material and a preparation method thereof

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  • Composite cathode material for lithium ion batteries and preparation method thereof

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] With ascorbic acid as carbon source, Li 7 La 3 Zr 2 o 12 is a solid electrolyte, and Li 3 V 2 (PO 4 ) 3 Co-preparation of double-coated composite cathode materials.

[0017] Step 1. Dissolve ascorbic acid in deionized water, stir at 80°C, and then add LiNO 3 ·H 2 O, La(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 · 5 h 2 O, molar ratio ascorbic acid:LiNO 3 ·H 2 O: La(NO 3 ) 3 ·6H 2 O: Zr(NO 3 ) 4 · 5 h 2 O=3.5:7:3:12, continue to stir until a sol is formed.

[0018] Step 2, add Li prepared earlier 3 V 2 (PO 4 ) 3 Materials, transferred to a high-pressure reactor, reacted at 180-200 °C for 24-40 hours, and then stirred the obtained product at 70-90 °C until the water was evaporated,

[0019] Step 3. Finally, the obtained precursor is sintered at 700-780° C. for 8-10 hours under an inert gas atmosphere to obtain...

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Abstract

The invention relates to the field of lithium ion batteries, and specifically relates to a novel composite cathode material for lithium ion batteries. An Li3V2(PO4)3 material is taken as a core, a fast ion conductor type solid electrolyte is embedded in a carbon-coated layer, and a double coated core-shell structure is formed with carbon, the lithium ion conduction speed of the lithium vanadium phosphate material is improved in a targeted manner, the defect that the electronic conductivity of the lithium vanadium phosphate material is recovered, and the lithium ion conduction speed can also beimproved obviously, so that the performances of the lithium vanadium phosphate cathode material are improved relatively comprehensively, the impedance is reduced, the specific capacity is improved, the circulation and rate performance is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery composite cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the most popular and promising electrochemical energy source due to their advantages such as high voltage, large capacity, light weight, small size, and long cycle life. In recent years, lithium-ion batteries have become one of the main energy sources in fields such as electronic equipment and electric vehicles. However, the potential safety hazards brought by organic electrolytes and the low ion diffusion rate in electrode materials limit the further development of lithium-ion batteries. At present, the main research directions of scholars are also carried out around these two major issues: 1. Research on new electrolytes such as gel electrolytes and pure solid electrolytes that can avoid potential safety hazards in the long-term...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 向勇李明彭晓丽张晓晴
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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