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A preparation method of a high-compaction high-capacity lithium manganate composite cathode material used for mixing ternary materials

A technology of composite positive electrode material and ternary material, which is applied in the field of lithium ion battery positive electrode material preparation, can solve the problems of not considering manganese source matching, poor consistency, difficulty in obtaining high-quality and high-performance materials, etc., to achieve capacity and compaction. Improve, avoid secondary crushing, achieve performance and cost effects

Active Publication Date: 2019-01-18
湖南海利锂电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing technology does not consider the matching of the particle size distribution of the manganese source and the lithium source, and there is a problem of poor consistency in the sintering process. Although the compaction of the mixed material has also been improved to a certain extent, it is difficult to obtain high-quality and high-performance materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Accurately weigh the particle size distribution as D 10 = 2.00 μm, D 50 =5.03μm, D 90 = 125kg of electrolytic manganese dioxide of 17.6 μm, particle size distribution is D 10 = 2.52 μm, D 50 = 5.71 μm, D 90 = 26.11kg of battery-grade lithium carbonate of 12.2 μm was added into the high-mixer simultaneously, and mixed for 18 minutes at a speed of 600r / min. ℃, holding time 20h, blowing volume 5m 3 / h. After the discharged material is cooled and passed through a vibrating sieve, lithium manganate materials with small particles and narrow particle size distribution can be obtained. The measured particle size distribution is: D 10 = 3.02 μm, D 50 = 6.2 μm, D 90 = 18.5 μm.

[0043] (2) Accurately weigh the particle size distribution as D 10 =5.47μm, D 50 = 16.0 μm, D 90 = 34.5 μm electrolytic manganese dioxide 125kg, particle size distribution is D 10 = 3.18 μm, D 50 =7.38μm, D 90 =15.1 battery grade lithium carbonate 26.11kg, add in the high mixer simultan...

Embodiment 2

[0048] (1) Accurately weigh the particle size distribution as D 10 = 2.53μ, D 50 = 6.2 μm, D 90 = 125kg of electrolytic manganese dioxide of 18.1 μm, particle size distribution is D 10 = 2.52 μm, D 50 = 5.71 μm, D 90 =25.85kg of battery-grade lithium carbonate of 12.2 μm is added into the high-mixer simultaneously and mixed for 25min at a speed of 600r / min. ℃, holding time 16h, blast volume 6m3 / h. After the material is cooled and passed through the vibrating screen, the lithium manganate material with small particles and narrow particle size distribution can be obtained, and its particle size distribution is: D 10 = 3.13 μm, D 50 = 7.3 μm, D 90 = 18.9 μm.

[0049] (2) Accurately weigh the particle size distribution as D 10 = 5.00 μm, D 50 = 16.7 μm, D 90 = 33.5 μm electrolytic manganese dioxide 125kg, particle size distribution is D 10 = 3.18 μm, D 50 =7.38μm, D 90 =15.1 battery grade lithium carbonate 25.85kg, add in the high mixer simultaneously, mix 25min with...

Embodiment 3

[0053] (1) Accurately weigh the particle size distribution as D 10 = 3.0 μm, D50 = 7.1 μm, D 90 = 125kg of electrolytic manganese dioxide of 20.1 μm, particle size distribution is D 10 = 2.52 μm, D 50 = 5.71 μm, D 90 =26.87kg of battery-grade lithium carbonate of 12.2 μm is added into the high mixer simultaneously, and mixed for 35min at a speed of 600r / min. ℃, heat preservation time 16h, blast volume 8m 3 / h. After the material is cooled and passed through the vibrating screen, the lithium manganate material with small particles and narrow particle size distribution can be obtained, and its particle size distribution is: D 10 = 4.05 μm, D 50 = 8.8 μm, D 90 = 21.0 μm.

[0054] (2) Accurately weigh the particle size distribution as D 10 =5.64μm, D 50 = 18.7 μm, D 90 = 125kg of electrolytic manganese dioxide of 33.6 μm, particle size distribution is D 10 = 3.18 μm, D 50 =7.38μm, D 90 =15.1 battery-grade lithium carbonate 26.87kg, add in the high mixer simultaneousl...

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Abstract

The invention discloses a preparation method of a high-compaction high-capacity lithium manganate composite cathode material used for mixing ternary materials, which comprises the following steps: 1.Preparing a lithium manganate cathode material with small particle size and narrow particle size distribution; 2, preparing a large-particle, wide-particle-size distribution lithium manganate cathodematerial; 3, mixing that lithium manganate cathode materials with different particle size distribution. The invention finely controls two kinds of manganese source and lithium source with different particle size distribution, taking fully into account the effect of grain growth at high temperature, two kinds of cathode materials with wide and narrow distribution were prepared respectively, At last, the defect of insufficient compaction of single material is solved by mixing according to a certain proportion, and the defect of morphology caused by conventional secondary classification is avoided. Thus, the cathode material with 1C gram capacity of 122- 125 mAh / g and compaction density of 3.15 g / cm3 can be obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and specifically relates to a simple and low-cost preparation method for high-compaction and high-capacity lithium manganate composite positive electrode materials that can be used with ternary materials. Background technique [0002] Many positive electrode materials currently on the market, such as lithium cobaltate, lithium manganate, ternary, lithium iron phosphate, etc., are affected to varying degrees by energy density, cycle performance, rate performance, high temperature performance, safety performance and cost, etc. Due to the impact of defects in some aspects, a single cathode material cannot better meet the increasing multi-functional requirements of different electrical products. The mixed positive electrode material not only has a simple process, but also strengthens the performance advantages of a single material while ma...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/0525
CPCH01M4/505H01M10/0525Y02E60/10
Inventor 彭爱国汪永斌肖伟庄新娟贺周初
Owner 湖南海利锂电科技有限公司
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