A preparation method for high-compaction high-capacity lithium manganate composite positive electrode material for mixing ternary materials

A composite positive electrode material and ternary material technology, applied in the field of lithium ion battery positive electrode material preparation, can solve the problems of difficult to obtain high-quality and high-performance materials, no consideration of manganese source matching, poor consistency, etc., to achieve capacity and compaction Improve, achieve performance and cost, avoid the effect of secondary crushing

Active Publication Date: 2021-09-03
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

A method for preparing a high-compaction and high-capacity lithium manganate composite positive electrode material for mixing ternary materials disclosed by the present invention comprises the following steps: Step 1. Prepare small particles and narrow particle size distribution lithium manganate positive electrode material Step 2. Preparation of lithium manganate positive electrode materials with large particles and wide particle size distribution; Step 3. Mixing lithium manganate positive electrode materials with two particle size distributions. The present invention finely controls two kinds of manganese sources and lithium sources with different particle size distributions, fully considers the growth effect of grains under high temperature reaction, respectively prepares positive electrode materials with two kinds of wide and narrow distributions, and finally mixes them in a certain proportion to solve the problem The shortcomings of insufficient compaction of a single material, while avoiding the shape defects caused by conventional secondary classification, so as to obtain a 1C gram capacity of 122-125mAh / g, and a compacted density of 3.15g / cm 3 above cathode materials.

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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Patent Type & Authority Patents(China)
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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