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Pulping method of high-nickel ternary lithium battery

A ternary lithium battery, high nickel technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in meeting requirements, and achieve the effect of ensuring consistency

Inactive Publication Date: 2019-04-16
JIANGSU TENPOWER LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Materials such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate have been difficult to meet the requirements of the next generation of new energy vehicles for lithium batteries

Method used

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  • Pulping method of high-nickel ternary lithium battery
  • Pulping method of high-nickel ternary lithium battery
  • Pulping method of high-nickel ternary lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 cathode material formula is as follows:

[0020] 8Ni11 96.9(weight)%, SP 1.5(weight)%, PVDF5130 1.6(weight)%,

[0021] Solvent NMP

[0022] The specific process and related parameters are shown in Table 1 and figure 1 shown.

[0023] Table 1 Embodiment 1 process flow and related parameters

[0024]

Embodiment 2

[0025] Embodiment 2 positive electrode material formula is as follows:

[0026] 8Ni11 97.2(weight)%, SP 1.2(weight)%, PVDF5130 1.6(weight)%,

[0027] Solvent NMP

[0028] The specific process and related parameters are shown in Table 2.

[0029] Table 2 Embodiment 2 process flow and related parameters

[0030]

[0031] The lithium battery made by the above process has high safety (the single cell passes the safety requirements of GBT31485); long life (+0.5C / -1C@25°C cycle more than 1500 times, capacity retention rate of 80%); high specific energy (single battery) The energy density of the battery can reach more than 300Wh / Kg); fast charging performance (satisfying 80% of the charging capacity in 30 minutes); excellent low temperature performance (+0.5C / -1C@-20℃ discharge capacity retention rate of more than 92%); and consistent battery The sex group rate reached over 97%.

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Abstract

The invention discloses a pulping method of a high-nickel ternary lithium battery. A positive electrode material comprises a high-nickel ternary positive electrode active material, a conductive agentSP, a binder PVDF and a solvent NMP. The pulping method comprises the following steps: (1) sequentially adding the positive electrode active material and the binder PVDF in batches, and stirring at alow speed for premixing; (2) adding part of the solvent NMP into the mixture obtained in the step (1), standing, stirring at a low speed, scraping, dispersing at a high speed, and scraping; and (3) adding the conductive agent SP into the mixture obtained in the step (2), adding the remaining solvent NMP in batches, standing for a period of time after adding the solvent NMP every time, stirring ata low speed, dispersing at a high speed, vacuumizing, stirring at a low speed, measuring the viscosity until the viscosity reaches a required value, and discharging. The method has the characteristicsthat the material dispersion process is optimized, and the product quality consistency is improved.

Description

technical field [0001] The invention relates to a pulping method for a high-nickel ternary lithium battery, belonging to the technical field of lithium batteries. Background technique [0002] The improvement of battery energy density depends on the development of new positive and negative electrode materials. In lithium-ion batteries, the cathode material occupies an important position, and its performance directly determines the performance index of the final battery product. Materials such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate have been difficult to meet the requirements of the next generation of new energy vehicles for lithium batteries. Ternary materials, especially cathode materials based on high-nickel ternary materials, are the main trend of research and development and industrialization at present and in the next five years. High-capacity anode materials, especially silicon carbon materials, are currently the most industriali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李菊香郑春龙刘小四杨韩琪刘涛
Owner JIANGSU TENPOWER LITHIUM