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Preparation method of high compact density lithium battery cathode material

A positive electrode material and compaction density technology, which is applied in the field of preparation of high compaction density lithium battery positive electrode materials, can solve the problems of reduced electrical performance cycle performance, low compaction density, and restrictions on material application, and achieve good material processing performance , reduced surface area, superior performance

Inactive Publication Date: 2012-07-18
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently LiCoO 2 Cathode material is the earliest and most mature product developed. It has the characteristics of high compaction and good processing performance. Its disadvantages are resource shortage and high price. Improving its compaction density will cause other electrical properties, especially cycle performance, to decline. There is already little room to increase energy density
Nickel-based / ternary materials (LiNi x co y m （1-x-y） o 2 ) has the advantages of high capacity, stable cycle performance, and low price. However, compared with lithium cobalt oxide materials, its main disadvantages are low electrical conductivity and low compaction density, which greatly restricts the use of this material in high energy density lithium ion Applications on the battery

Method used

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  • Preparation method of high compact density lithium battery cathode material
  • Preparation method of high compact density lithium battery cathode material
  • Preparation method of high compact density lithium battery cathode material

Examples

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Effect test

Embodiment 1

[0035] Weigh commercial materials (Ni x CO y mn z ) 3 o 4 with Li 2 CO 3 , (Ni x CO y mn z ) 3 o 4 D50=9.2um, D10=6.02um, D90=17.05um, Li 2 CO 3 D50=5.65um, D10=2.22um, D90=11.12um, put it into the mixing equipment for dry mixing for 2 hours, put it into the furnace for sintering after mixing, raise it to 900°C at 3°C / min, keep it for 8h and then cool with the furnace, after sintering The material was sieved to obtain the positive electrode composite material in the present invention, which is numbered A1.

[0036] The cathode material of this example, the binder PVDF, the solvent NMP and the conductive agent were stirred evenly to prepare the cathode slurry, and the cathode slurry was evenly coated on both sides of the aluminum foil, rolled and cut to obtain the cathode sheet. Test the maximum compaction density of the positive electrode sheet. Using natural graphite as the negative electrode active material, CMC as the thickener, SBR as the binder, H 2 O is a ...

Embodiment 2

[0038] Weigh commercial materials (Ni x CO y mn z ) 3 o 4 with Li 2 CO 3 , (Ni x CO y mn z ) 3 o 4 D50=9.2um, D10=6.02um, D90=17.05um, Li 2 CO 3 D50=5.65um, D10=2.22um, D90=11.12um, put it into the mixing equipment for 2 hours, put it into the furnace for sintering, raise it to 920℃ at 3℃ / min, keep it warm for 8 hours and then cool it with the furnace, after sintering The materials were sieved to obtain the positive electrode composite material in the present invention, coded as A2.

Embodiment 3

[0040] Weigh commercial materials (Ni x CO y mn z ) 3 o 4 with Li 2 CO 3 , (Ni x CO y mn z ) 3 o 4 D50=9.2um, D10=6.02um, D90=17.05um, Li 2 CO 3 D50=5.65um, D10=2.22um, D90=11.12um, put it into the mixing equipment for 2 hours, put it into the furnace for sintering, raise it to 920℃ at 3℃ / min, keep it warm for 8 hours and then cool it with the furnace, after sintering The materials were sieved to obtain the positive electrode composite material of the present invention, numbered A3.

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Abstract

The invention discloses a preparation method of a high compact density lithium battery cathode material, the compact density of the prepared high compact density lithium battery cathode material is higher than that of a ternary material, the maximum compact density of the high compact density cathode material is greater than or equal to 3.85g / cm<3>, the method comprises the following steps: two materials of (NixCOyMnz)3O4 and Li2CO3 are uniformly mixed according to mol ratio, placed in a kiln to prepare the high compact density lithium battery cathode material according to certain calcining temperature and atmosphere; the invention also comprises the appropriate doped elements which possess influence on LiNi0.5Co0.2Mn0.3O2 monocrystalline particle growth effect and densification degree between particles, residual lithium carbonate, lithium oxide and the like on the surface of the material can be reduced by calcining, therefore a firmly functionalized microstructure is formed. The material of the invention has the advantages of high energy density and low cost, and the preparation method is simple and easy to carry out industrial production and control.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a positive electrode material of a high compacted density lithium battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, and good safety performance, so they are widely used in mobile phones, Mobile devices such as digital cameras and laptops. With the development of science and technology, various digital products using lithium-ion batteries are updated and upgraded very quickly, and most of the products tend to be portable and economical. This requires lithium-ion battery products to develop in the direction of high energy density. Expensive LiCoO 2 Lithium battery manufacturers that mainly use cathode materials have found it diffic...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 曾跃武黄连友
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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