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Lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of structural stability of lithium ion diffusion, restricting large-scale commercial application, poor cycle stability, etc., to achieve excellent cycle. Stability, excellent high rate performance, the effect of improving electronic conductivity

Active Publication Date: 2019-07-26
HENAN INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, LiMn 2 o 4 Mn in cathode material 3+ The Jahn-Teller effect, oxygen deficiency and the dissolution of manganese in the electrolyte, for LiMn 2 o 4 The structural stability and Li-ion diffusion have a severe impact, leading to LiMn 2 o 4 Poor cycle stability and low rate of cathode materials in the charge and discharge process restrict the large-scale commercial application of the material.

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a preparation method for the above-mentioned lithium-ion battery cathode material, comprising the following steps:

[0035] (1) Mix Li source, Mn source and dopant according to stoichiometric ratio to obtain mixed slurry; said dopant includes Mg source, Zn source, Cu source, Ni source, Co source, Cr source, Al source , Ga source, In source, Tl source, Ti source, Si source or Zr source;

[0036] The mixed slurry is sequentially dried, pre-calcined and final-calcined to obtain doped modified lithium manganate;

[0037] (2) refine the doped modified lithium manganate obtained in the step (1), to obtain nanoscale doped modified lithium manganate;

[0038] (3) Granulating after mixing the nano-scale doped modified lithium manganese oxide and carbon nanotubes obtained in the step (2), obtaining a micron-scale spherical core based on carbon nanotube three-dimensional contact consolidation;

[0039] (4) dispersing the conducting polymer mon...

Embodiment 1

[0054] Embodiment 1 prepares the flow chart of lithium-ion battery cathode material as figure 1 shown, according to figure 1 The method shown prepares the positive electrode material of lithium ion battery.

[0055] Aluminum nitrate, electrolytic manganese dioxide and lithium carbonate were mixed according to the molar ratio of Li, Mn and Al of 1.05:1.95:0.05, and wet ball milled for 3 hours under the action of anhydrous ethanol grinding aid. After ball milling, the obtained mixed slurry was transferred to an evaporating dish for drying. Finally, grind the dried mixture evenly and place it in a muffle furnace for pre-calcination at 450°C for 4h, then grind it again and place it in a muffle furnace for final firing at 800°C for 12h to obtain LiMn 1.95 al 0.05 o 4 .

[0056] LiMn prepared by ball milling 1.95 al 0.05 o 4 Grinding into nano-sized particles, the dispersant is absolute ethanol, the rotating speed is 300r / min, and the time is 10h. Then 10 g of the obtained ...

Embodiment 2

[0061] Mix magnesium nitrate, trimanganese tetraoxide and lithium hydroxide according to the molar ratio of Li, Mn and Mg of 1.05:1.95:0.05, and wet ball mill for 3 hours under the action of absolute ethanol grinding aid. After ball milling, the obtained mixed slurry was transferred to an evaporating dish for drying. Finally, the dried mixture was ground evenly and placed in a muffle furnace for pre-calcination at 400°C for 6 hours, and then ground again and placed in a muffle furnace for final firing at 780°C for 15 hours to obtain LiMn 1.95 Mg 0.05 o 4 .

[0062] LiMn prepared by ball milling 1.95 Mg 0.05 o 4 Grinding into nano-sized particles, the dispersant is absolute ethanol, the rotating speed is 300r / min, and the time is 10h. Then 12 g of the obtained nanoparticles and 1 g of MWCNT were mixed, 15 mL of deionized water was added, and the resulting solution was spray-dried at 180 ° C to obtain the core LiMn 1.95 Mg 0.05 o 4 @MWCNT, and dried at 150°C.

[0063] ...

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Abstract

The invention provides a lithium ion battery positive electrode material and a preparation method thereof, and belongs to the field of positive electrode materials. The lithium ion battery positive electrode material provided by the invention is of a core-shell structure and consists of a core and a coating layer, wherein the core comprises a doped modified lithium manganate and a carbon nano tube, and the carbon nano tube is in three-dimensional contact and solid-junction doping with modified lithium manganate to form a micron-scale spherical material; and the coating layer comprises a double-phase flexible polymer. The lithium ion battery positive electrode material provided by the invention has excellent cycling stability and high rate performance, and after 200 cycles, the capacity retention rate can be up to 98.9%; and in addition, the positive electrode material of the lithium ion battery still has a large discharge specific capacity at a high rate, and when the charging rate isincreased from 0.5C to 30 C, the retention rate of the first-time discharge specific capacity is 84.5%.

Description

technical field [0001] The invention relates to the field of positive electrode materials, in particular to a lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] spinel LiMn 2 o 4 As a cathode material for lithium-ion batteries, it has the advantages of high voltage platform, good thermal stability, rich manganese resources, mature preparation technology, low production cost, good safety performance, and no pollution to the environment. Compared with lithium iron phosphate and ternary materials, the overall cost performance of this material is relatively high, and it has an outstanding cost advantage. [0003] However, LiMn 2 o 4 Mn in cathode material 3+ The Jahn-Teller effect, oxygen deficiency and the dissolution of manganese in the electrolyte, for LiMn 2 o 4 The structural stability and lithium ion diffusion have a severe impact, leading to LiMn 2 o 4 Cathode materials have problems such as poor cycle ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 赵红远高欣杨苏建修李勇峰赵二庆张明明张亚奇吴婷婷冯宜鹏王占奎
Owner HENAN INST OF SCI & TECH
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