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A kind of preparation method of high compaction density micron-scale single crystal ternary positive electrode material

A positive electrode material, micron-scale technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of limiting the application of ternary materials, low compaction density, secondary particle breakage, etc., and achieve good product shape consistency , increase the compaction density, improve the effect of cycle performance

Active Publication Date: 2019-07-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current traditional ternary materials are generally spherical or spherical secondary particles formed by the aggregation of nano-scale primary particles. This shape will not only make the material prone to secondary The particles are broken and cause their compacted density to be low (generally 3.5g / cm 3 left and right), which greatly limits the application of ternary materials in high energy density batteries

Method used

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  • A kind of preparation method of high compaction density micron-scale single crystal ternary positive electrode material
  • A kind of preparation method of high compaction density micron-scale single crystal ternary positive electrode material
  • A kind of preparation method of high compaction density micron-scale single crystal ternary positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. Add 18.3220g Ni 0.5 co 0.2 mn 0.3 (OH) 2 Add it into the ball mill tank, and ball mill it at 100r / min for 1h; then the ball milled Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mix well with 0.1832g polyvinyl alcohol and 0.0092g boric acid, mix well and then place it at 400°C for 3h to get substance A;

[0028] Step 2. Add the substance A obtained in step 1 and 7.6107g lithium carbonate into a ball mill tank, and ball mill and mix for 3h at 200r / min to obtain the mixed substance B;

[0029] Step 3. Place the mixed substance B obtained in step 2 in a tube furnace, and feed into the tube furnace an oxygen-nitrogen mixed gas with an oxygen volume fraction of 20%, and heat it to 900° C. at a heating rate of 0.1° C. / min. After calcination at constant temperature for 10 hours, the temperature is naturally lowered to obtain a high compacted density micron-sized single crystal ternary positive electrode material.

[0030] From figure 1 It can be seen from the SEM image of the te...

Embodiment 2

[0033] Step 1. 32.608g (Ni 1 / 3 co 1 / 3 mn 1 / 3 ) 2 o 3 Add in the ball mill jar, ball mill and pulverize at 600r / min for 6h; then the ball mill pulverized (Ni 1 / 3 co 1 / 3 mn 1 / 3 ) 2 o 3 Mix well with 0.1630g of lithium fluoride and 3.2608g of polyvinylpyrrolidone, mix well and then place it at 550°C for 8h to obtain substance A;

[0034] Step 2. Add the substance A obtained in step 1 and 8.6438g of lithium hydroxide into a ball mill tank, and ball mill and mix at 500r / min for 2.5h to obtain the mixed substance B;

[0035] Step 3. Place the mixed substance B obtained in step 2 in a tube furnace, and feed an oxygen-nitrogen mixed gas with an oxygen volume fraction of 80% in the tube furnace, and heat it to 800 °C at a heating rate of 3.0 °C / min. After calcination at constant temperature for 15 hours, the temperature was naturally lowered to obtain a high compacted density micron-sized single crystal ternary positive electrode material.

[0036] It can be seen from the SEM...

Embodiment 3

[0039] Step 1. Add 18.4678g Ni 0.8 co 0.1 mn 0.1 (OH) 2 Add it into the ball mill tank, and ball mill it at 300r / min for 2h; then the ball milled Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix with 0.3417g of boron oxide evenly, and after mixing evenly, place it at 800°C for 6h to obtain substance A;

[0040] Step 2. Add the substance A obtained in step 1 and 14.4795g lithium nitrate into a ball mill tank, and ball mill and mix for 3h at 550r / min to obtain the mixed substance B;

[0041] Step 3. Place the mixed substance B obtained in step 2 in a tube furnace, feed pure oxygen into the tube furnace, heat it up to 700 °C at a heating rate of 5.0 °C / min, and naturally cool down after calcination at a constant temperature for 20 hours to obtain high Compacted density micron-scale single crystal ternary cathode material.

[0042] It can be seen from the SEM image of the ternary cathode material prepared in this embodiment that the particle size of the ternary cathode material is 4 μm˜7 μ...

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Abstract

The invention relates to a preparation method of a high compaction density micron-grade monocrystal ternary cathode material, and belongs to the technical field of lithium ion battery materials. The preparation method comprises the following steps: firstly ball-milling and smashing a ternary precursor, then uniformly mixing the ball-milled and smashed ternary precursor with an additive and carrying out high-temperature heat treatment to obtain a substance A; after uniformly mixing the substance A with a lithium salt in a ball-milling tank, putting the mixture in an oxygen-containing atmosphere for calcinations, and naturally cooling to obtain the ternary cathode material. The ternary cathode material is simple in preparation method technique and good in product appearance consistency, and is suitable for large-scale production; and the prepared ternary cathode material has the advantages of micron-grade monocrystal appearance, large compaction density and good electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a micron-scale single crystal ternary cathode material with a high compaction density, in particular to LiNi, a micron-scale lithium-ion battery ternary cathode material with a high compaction density x co y mn z o 2 The preparation method belongs to the technical field of lithium ion battery materials. Background technique [0002] As a new type of green power source, lithium-ion batteries have the advantages of high specific energy, small size, light weight and long cycle performance, and have been widely used in portable electronic devices such as notebook computers, digital cameras, and mobile devices. However, the excellent performance of lithium-ion batteries depends largely on the selection of cathode materials. [0003] Currently commercialized positive electrode materials mainly include lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ) a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈人杰魏磊吴锋李丽王萌马一添
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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