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Lithium ion battery positive pole piece and preparation method thereof

A technology for lithium-ion batteries and positive pole pieces, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of complex pre-synthesis process of positive electrode materials, is not conducive to industrial application, and increases additional costs, so as to achieve easy industrial production , high energy density, low cost effect

Pending Publication Date: 2021-12-14
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The MoO introduced in the technical scheme of the invention 3 Acting as an important shell role, the lack of MoO can be found through the comparison sample 3 , the cycle performance will drop significantly
At the same time MoO 3 There is no capacity to play and additional costs are added
The pre-synthesis process of the entire cathode material is complicated, has high environmental requirements, and high cost, which is not conducive to industrial application

Method used

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  • Lithium ion battery positive pole piece and preparation method thereof
  • Lithium ion battery positive pole piece and preparation method thereof
  • Lithium ion battery positive pole piece and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The mass percent of the lithium-rich manganese-based material in the positive electrode active material is 50%:

[0046] 1) Check the airtightness of the batching pot to ensure that there is no abnormality in the airtightness, and then add 800g of carbon nanotube slurry (Jiangsu Tiannai Technology Co., Ltd., LB100-50) and 56g of polyvinylidene fluoride glue (Ruyuan Dongyangguang Fluoride Co., Ltd. Resin Co., Ltd., HEVER601), then add 500g N-methylpyrrolidone, and stir for 60min;

[0047] 2) Open the batching pot, add 20g conductive carbon black, 20g graphite and 2400g single crystal ternary material LiNi 0.55 co 0.15 mn 0.3 o 2 (Nickel 55 ternary, median particle size D50 is 3-8μm, specific surface area is 0.3-0.8m 2 / g), stirring for 60min;

[0048] 3) Open the batching pot and add 2400g lithium-rich manganese-based material Li 1.15 Ni 0.35 mn 0.5 o 2 (median particle size D50 is 5-10μm, specific surface area is 0.5-1.0m 2 / g), stirred for 60min to obtain the...

Embodiment 2

[0061] The content of lithium-rich manganese-based materials in the positive electrode active material is 20%:

[0062] On the basis of Example 1, the addition amount of the single crystal ternary material in the second step and the addition amount of the lithium-rich manganese-based material in the third step were adjusted to 3840 g and 960 g. Similarly, the slurry was made into an electrode, and a battery D was assembled with a conventional negative electrode material with graphite as the active material, and the electrical performance was tested.

[0063] Such as figure 1 and figure 2 As shown, the 1C / 1C cycle performance of battery A at room temperature and high temperature is better than that of batteries B and C. It can be seen that the battery 1C / 1C cycle performance of the positive electrode active material formed by combining single crystal ternary materials and lithium-rich manganese-based materials is better than that of batteries alone A battery using single cry...

Embodiment 3

[0065] 1) Check the airtightness of the batching pot to ensure that there is no abnormality in the airtightness, then add 800g of carbon nanotube slurry and 69g of polyvinylidene fluoride glue, then add 500g of acetone, and stir for 90min;

[0066] 2) Open the batching pot, add 16g conductive carbon black, 16g graphite and 2400g nickel 55 ternary, stir for 90min;

[0067] 3) Open the batching pot and add 2400g lithium-rich manganese-based material Li 1.15 Ni 0.35 mn 0.5 o 2 , stirred for 60min to obtain the slurry stock solution;

[0068] 4) Finally, adjust the viscosity of the slurry stock solution to about 14000mpa.s by adding N-methylpyrrolidone, and continue stirring for 180min to obtain the positive electrode slurry.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery positive pole piece and a preparation method thereof. The lithium ion battery positive pole piece comprises a current collector and a positive coating coated on the surface of the current collector, and the positive coating comprises a positive active material, a conductive agent and a binder; and the positive electrode active material is a compound formed by a single-crystal ternary material and a lithium-rich manganese-based material. The single-crystal ternary material and the lithium-rich manganese-based material can be directly compounded in the production process of the lithium battery, so that the positive pole piece for the lithium battery is prepared, the cost is low, and industrial production is easy; the lithium ion battery prepared from the positive plate can be applied to voltage of 4.3 V and above, and has the characteristics of high energy density and low cost; Li consumed in the circulation process can be supplemented due to the existence of the lithium-rich manganese base, and the service life attenuation is slowed down to a certain extent; when the positive plate is matched with a silicon-carbon negative electrode with relatively low initial efficiency, the defect of relatively low initial efficiency of the silicon-carbon negative electrode is overcome.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery positive pole piece and a preparation method thereof. Background technique [0002] In the current lithium-ion battery system, the specific capacity of the entire battery is mainly limited by the capacity of the positive electrode material. In addition, in the production of batteries, the cost of positive electrode materials accounts for more than 30% of the total material cost. Therefore, the preparation of cathode materials with low cost and high energy density is an important goal in the research and production of lithium-ion batteries. [0003] At present, the main material factory is optimizing the existing ternary material synthesis process, and improving the stability of the material by doping or generating a single crystal structure, so that the upper limit of the battery working voltage can be increased to 4.3V and above, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/131H01M4/1391H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCH01M4/02H01M4/131H01M4/1391H01M4/364H01M4/502H01M4/505H01M4/523H01M4/525H01M4/483H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 谈亚军赵成龙陈梦婷
Owner SUZHOU PHYLION BATTERY
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