Method for processing ternary material by being clad with lithium ferric manganese phosphate

A technology of lithium iron manganese phosphate and ternary materials, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as the reduction of energy density of mixed electrodes, improve coagulation, reduce alkalinity, and reduce residual alkali. The effect of content

Inactive Publication Date: 2016-03-16
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patents CN103682318.A and CN104201366.A use the high safety performance of LFP to compound LFP and NMC during the homogenization process. In addition to the same problem of material uniformity in the above two patents, because the energy density of LFP is lower than that of NMC, The energy density of the hybrid electrode after recombination is reduced, that is, the performance improvement is at the expense of energy density

Method used

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  • Method for processing ternary material by being clad with lithium ferric manganese phosphate
  • Method for processing ternary material by being clad with lithium ferric manganese phosphate
  • Method for processing ternary material by being clad with lithium ferric manganese phosphate

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Embodiment 1

[0034] A method for coating and processing ternary materials with lithium manganese iron phosphate, comprising the following process:

[0035] 1. Preparation of LFMP precursor slurry: Weigh Li respectively in proportion 2 CO 3 2.62g, C 2 h 2 FeO 6 2H 2 O2.55g, MnO4.02g, H 3 PO 4 6.94g, 20g ascorbic acid, 120g alcohol, stir and mix for 0.5h under protective atmosphere;

[0036] 2. Mixing of raw materials: Weigh 100g ternary material (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) was added to the above slurry, the slurry was vacuum-dried at 120° C. for 12 hours after continuing to stir for 2 hours.

[0037] 3. Preparation of ternary material / lithium manganese iron phosphate composite positive electrode material: Put the dried mixed material into an argon protective atmosphere sintering furnace, keep it at 400°C for 2h, then raise the temperature to 600°C for 12h, and cool it with the furnace After 280 mesh sieves, ternary material / lithium manganese iron phosphate (LiFe 0.2 mn 0.8 P...

Embodiment 2

[0039] A method for coating and processing ternary materials with lithium manganese iron phosphate, comprising the following process:

[0040] 1. Preparation of LFMP precursor slurry: Weigh LiH 2 PO 4 3.66g, FeCl 2 0.32g, MnC 2 o 4 0.1g, NH 4 h 2 PO 4 5.98g, 5g ascorbic acid, 150g alcohol, stirred and mixed for 0.5h under protective atmosphere;

[0041] 2. Mixing of raw materials: Weigh 100g ternary material (LiNi 0.5 co 0.2 mn 0.3 o 2 ) into the above slurry, continue to stir for 2 hours, then vacuum dry the slurry at 120°C for 12 hours;

[0042]3. Preparation of ternary material / lithium manganese iron phosphate composite positive electrode material: Put the dried mixed material into an argon protective atmosphere sintering furnace, keep it at 350°C for 3h, then raise the temperature to 500°C for 16h, and cool it with the furnace After 280 mesh sieves, ternary material / lithium manganese iron phosphate (LiFe 0.8 mn 0.2 PO 4 ) Composite cathode material.

Embodiment 3

[0044] A method for coating and processing ternary materials with lithium manganese iron phosphate, comprising the following process:

[0045] 1. Preparation of LFMP precursor slurry: Weigh CH 3 COOLi41.88g, FeSO 4 ·7H 2 O88.34g, MnCO 3 36.53g, (NH 4 ) 2 HPO 4 83.88g, 50g ascorbic acid, 375g alcohol, stirred and mixed for 0.5h under protective atmosphere;

[0046] 2. Mixing of raw materials: Weigh 100g ternary material (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) into the above slurry, continue to stir for 2 hours, then vacuum dry the slurry at 120°C for 12 hours;

[0047] 3. Preparation of ternary material / lithium manganese iron phosphate composite positive electrode material: put the dried mixed material into an argon protective atmosphere sintering furnace, keep it at 400°C for 2h, then raise the temperature to 600°C for 12h, and cool it with the furnace After 280 mesh sieves, ternary material / lithium manganese iron phosphate (LiFe 0.5 mn 0.5 PO 4 ) Composite cathode materia...

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Abstract

The invention relates to a method for processing a ternary material by being clad with lithium ferric manganese phosphate. The invention belongs to the technical field of a cathode material of lithium ion batteries. The method for processing the ternary material by being clad with the lithium the ferric manganese phosphate comprises the steps of 1, preparation of LFMP precursor slurry: respectively weighing iron, manganese, lithium and phosphorus sources in proportion required by 0.1-100g LFMP, weighing 0-50g ascorbic acid, and adding a dispersion solvent, wherein the solid content is 10%-80%; 2, mixture of materials: weighing 100g ternary material with the constitute of Li(z)Ni(1-x-y)Co(x)Mn(y)O(2), or the mixture of two or more constitutes with the above proportion, adding the slurry, mixing the slurry and the mixture, and carrying out vacuum drying; 3, preparation of the ternary material / lithium ferric manganese phosphate composite cathode material: putting the materials into an argon protective atmosphere sintering surface, keeping warm at the temperature of 250-400 DEG C for 2-6h, then heating to 500-700 DEG C and keeping for 6-16h, cooling along with the furnace, and sieving. The method provided by the invention has the advantages of being simple in technology, convenient to operate, accordant in material performance, small in influence on cell capacity density, and being capable of improving safety performance of the ternary material.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a method for coating and treating ternary materials with lithium manganese iron phosphate. Background technique [0002] At present, NMC power batteries have high energy density and good rate performance, and have broad application prospects. However, the problem of gas production in pure NMC power batteries is relatively serious, and the safety of batteries has always been a great technical challenge, making it difficult for pure ternary power batteries to pass the test conditions such as acupuncture and overcharge. [0003] After NMC is mixed with a small amount of LFMP, it can inhibit the chain reaction of ternary materials in the case of thermal runaway to a certain extent, and LFMP is weakly acidic. After coating NMC materials with LFMP, it can not only reduce the residual alkali content on the surface of NMC material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/5825H01M10/0525Y02E60/10
Inventor 李文升
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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