Lithium-ion battery positive material coated with metal phosphate on surface and preparation method of lithium-ion battery positive material

A surface-coated phosphoric acid and lithium-ion battery technology, applied to battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problems of large particles, long time, high process requirements, etc., to achieve cycle stability and Improved magnification performance, easy industrial production, and uniform coating

Active Publication Date: 2012-12-19
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple liquid-phase precipitation method is difficult to ensure the uniformity of the precipitation, the particles are large, and the purity is low; while the commonly used sol-gel method can achieve uniform coating, but the process requirements are high and the time is long

Method used

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  • Lithium-ion battery positive material coated with metal phosphate on surface and preparation method of lithium-ion battery positive material
  • Lithium-ion battery positive material coated with metal phosphate on surface and preparation method of lithium-ion battery positive material
  • Lithium-ion battery positive material coated with metal phosphate on surface and preparation method of lithium-ion battery positive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 100 g of polyacrylamide aqueous solution with a weight percentage of 0.5% (that is, 0.5 wt %), and add 50 g of positive electrode material Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 , magnetic stirring for 3h; add 0.05mol / L of (NH 4 ) 2 HPO 4 Solution 147ml and 0.05mol / L Zr(NO 3 ) 4 The solution was 92ml, stirred continuously for 24h, then filtered, dried, and finally heat-treated at 400°C for 2h to obtain a positive electrode material with a surface coating amount of 2wt%.

[0028] Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Surface coated with Zr 3 (PO 4 ) 4 Scanning electron microscope (SEM) images of before and after figure 1 As shown, it can be seen that there are obvious nano-scale coating particles on the surface of the modified material.

[0029] Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Surface coated with Zr 3 (PO 4 ) 4 X-ray diffraction (XRD) images before and after figure 2 As shown, it can be seen that the crystal structure has not chan...

Embodiment 2

[0032] Weigh 0.5wt% polyacrylamide aqueous solution 100g, add 50g positive electrode material Li[Li] wherein 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 , magnetically stirred for 3h; then sequentially added 0.025mol / L (NH 4 ) 2 HPO 4Solution 197ml and 0.025mol / L Al(NO 3 ) 3 The solution was 164ml, stirred continuously for 24h, then filtered, dried, and finally heat-treated at 400°C for 2h to obtain a positive electrode material with a surface coating amount of 1wt%.

[0033] Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Surface coated with AlPO 4 The cycle performance curve before and after Figure 4 As shown, it can be seen that the first discharge capacity of the material before coating is 241.1mAh / g, when charging and discharging at 0.1C, 2~4.8V, the capacity retention rate after 100 cycles is 86.4%; the coated AlPO 4 The first discharge capacity of the final positive electrode material is 261.3mAh / g, when charging and discharging at 0.1C, 2~4.8V, the capacity retention rate ...

Embodiment 3

[0036] Weigh 150g of 0.25wt% polyacrylamide aqueous solution, add 50g of positive electrode material Li[Li] wherein 0.13 mn 0.47 Ni 0.2 co 0.2 ]O 2 , magnetically stirred for 3h; then sequentially added 0.05mol / L (NH 4 ) 2 HPO 4 Solution 74ml and 0.05mol / L Zr(NO 3 ) 4 46ml of the solution was stirred continuously for 24 hours, then filtered, dried, and finally heat-treated at 300°C for 2 hours to obtain a positive electrode material with a surface coating amount of 1wt%.

[0037] Li[Li 0.13 mn 0.47 Ni 0.2 co 0.2 ]O 2 Surface coated with Zr 3 (PO 4 ) 4 The cycle performance curve before and after Image 6 As shown, it can be seen from the figure that the first discharge capacity of the material before coating is 231.1mAh / g, when charging and discharging at 0.1C, 2~4.8V, the capacity retention rate after 50 cycles is 87.1%; the coating Zr 3 (PO 4 ) 4 After Li[Li 0.13 mn 0.47 Ni 0.2 co 0.2 ]O 2 The initial discharge capacity of the material is 243.8mAh / g, ...

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PUM

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Abstract

The invention discloses a lithium-ion battery positive material coated with metal phosphate on the surface and a preparation method of the lithium-ion battery positive material. The preparation method comprises the following steps of: (1) adding the positive material into a dissolved dispersing agent solution, and fully and uniformly dispersing the positive material; (2) successively adding an ammonium hydrogen phosphate solution and a metal phosphate solution into the solution, and stirring; and (3) filtering, drying, carrying out heating treatment for 1-5 hours at the temperature of 300-700 DEG C, and preparing the positive active material with the coated surface. The lithium-ion battery positive material provided by the invention has the advantages that the cycling stability and the rate capability of the active material can be obviously improved, the preparation process is simple, and the large-scale production is easy.

Description

technical field [0001] The invention relates to a lithium-ion battery material, in particular to a lithium-ion battery positive electrode material coated with phosphoric acid metal salt on the surface and a preparation method thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high specific energy, long cycle life, green environmental protection, small self-discharge, and no memory effect. Other portable electrical appliances, and gradually expand to high-power systems such as electric vehicles, smart grids, space satellites, and distributed energy systems. At present, the commonly used cathode materials for lithium-ion batteries are LiCoO 2 , LiMn 2 o 4 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 、LiFePO 4 etc. These cathode materials have their own advantages and disadvantages, such as the ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 Although the discharge capacity is high, the rate performance is poor, and the cycle stability is poor whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525B82Y30/00B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 宋缙华顾海涛解晶莹王可黄莉汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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