Cathode material of lithium ion battery and preparation method and lithium ion battery

A technology of lithium-ion batteries and positive electrode materials, which is applied in the manufacture of electrodes, battery electrodes, and electrolyte storage batteries. It can solve the problems of low first-time Coulombic efficiency, low positive electrode gram capacity, and capacity loss of positive electrode active materials to reduce capacity. Loss, increase energy density, increase the effect of capacity play

Pending Publication Date: 2020-04-10
湖州鑫远电池系统技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to improve the energy density of lithium-ion batteries, active materials such as high-capacity silicon alloys are used in the negative electrodes of lithium-ion batteries. The gram capacity is too low, resulting in the capacity loss of the positive electrode active material

Method used

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  • Cathode material of lithium ion battery and preparation method and lithium ion battery
  • Cathode material of lithium ion battery and preparation method and lithium ion battery
  • Cathode material of lithium ion battery and preparation method and lithium ion battery

Examples

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preparation example Construction

[0027] The present invention also provides a kind of preparation method of the cathode material of lithium ion battery, comprises the steps:

[0028] According to the mass percentage of 77-97%: 1-15%: 0.1-3%: 1-5%, weigh the high-capacity positive electrode active material, lithium supplement material, conductive agent and binder; the chemical formula of the lithium supplement material is: LixMyNz, where, 1≤x≤8, 1≤y≤6, 1≤z≤6, M is one or more metal elements in Fe, Cu, Mn, Zr, Mg, Al, N is O, N , one or more non-metal elements in F, B, S;

[0029] Using a wet homogenization process, the binder and the solvent are added to the mixer at a weight ratio of 1:10, stirred until the binder is fully dissolved, then the conductive agent is added, and the stirring is continued;

[0030] Add the high-capacity positive electrode active material and the lithium supplement material that have been dried, and stir evenly to obtain the final positive electrode material of the lithium ion batte...

Embodiment 1

[0036] The high-capacity positive electrode active material NCM811 (specific capacity 195mAh / g), the lithium-supplementing material Li 2 NiO 2 , conductive agent SP+CNT, and binder PVDF are weighed according to the weight ratio of 89.2%: 5.8%: 1.8%: 2.2%, and are homogenized by wet homogenization process, and coated on the aluminum foil of the carbon-coated positive electrode current collector. , aluminum foil thickness 12um, carbon coating thickness 1um, coating surface density 380g / m 2 (N / P=15%), after drying, the compacted density is 3.42g / cm 3 , slitting, and die-cutting to obtain the positive electrode sheet prepared in Example 1 of the present invention.

Embodiment 2

[0041] The high-energy cathode active material NCM811 (specific capacity 195mAh / g), the lithium supplement material Li 2 NiO 2 , conductive agent SP+CNT, and binder PVDF are weighed according to the weight ratio of 87.5%: 8.5%: 1.5%: 2.5%, and the wet homogenization process is adopted. First, the binder PVDF and the solvent NMP are weighed in a weight ratio of 1:10 Add to the mixer, stir for 3 hours until the PVDF is fully dissolved, then add the conductive agent SP+CNT and stir for 1 hour, and finally add the dried high-energy positive electrode active material and Li supplementary material Li 2 NiO 2 Stir for 3 hours, use NMP to adjust the viscosity, and control the viscosity range between 6500-8500mPa·s. Coat the uniformly dispersed slurry on carbon-coated aluminum foil, the thickness of the aluminum foil is 12um, the thickness of the carbon-coated layer is 1um, and the coating surface density is 380g / m 2 (N / P=15%), after drying, the compacted density is 3.42g / cm 3 . S...

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Abstract

The invention provides a cathode material of a lithium ion battery. The cathode material comprises a high-capacity cathode active material, a lithium supplementing material, a conductive agent and a binder, wherein the mass percentage ratio of the high-capacity cathode active material to the lithium supplementing material to the conductive agent to the binder is (77-97%):(1-15%):(0.1-3%):(1-5%); the chemical formula of the lithium supplementing material is LixMyNz, x is larger than or equal to 1 and smaller than or equal to 8, y is larger than or equal to 1 and smaller than or equal to 6, z islarger than or equal to 1 and smaller than or equal to 6, M is one or more metal elements of Fe, Cu, Mn, Zr, Mg and Al, and N is one or more non-metal elements of O, N, F, B and S. The invention alsoprovides a preparation method of the cathode material of the lithium ion battery and the lithium ion battery. According to the cathode material of the lithium ion battery, the preparation method andthe lithium ion battery provided by the invention, the capacity exertion of the cathode active material can be improved, the active lithium consumed by the first irreversible capacity loss is well compensated, and the energy density of the lithium ion battery is further improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material of the lithium ion battery, a preparation method and the lithium ion battery. 【Background technique】 [0002] With the rise of the new energy industry, new energy vehicles powered by lithium-ion batteries are developing rapidly, and the energy density of lithium-ion batteries directly affects the cruising range of new energy vehicles. At present, in order to improve the energy density of lithium-ion batteries, active materials such as high-capacity silicon alloys are used in the negative electrodes of lithium-ion batteries. The gram capacity is too low, resulting in the capacity loss of the positive electrode active material. [0003] In view of this, it is necessary to provide a novel positive electrode material for lithium ion batteries, a preparation method and a lithium ion battery to overcome the above defects. 【Content of inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/58H01M4/04H01M10/0525H01M10/058H01M10/42
CPCH01M4/04H01M4/485H01M4/58H01M4/5815H01M4/582H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 饶睦敏孙祥军查惟伟刘胜男代东举张芳妍
Owner 湖州鑫远电池系统技术有限公司
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