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Lithium ion battery having cobalt-free Ni-Mn solid solution nickel-based positive electrode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfavorable environment-friendly development, low cobalt element abundance, high price, etc., and achieve improved battery cycle performance and dispersion Good, stable material structure effect

Inactive Publication Date: 2019-07-02
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the abundance of cobalt in the earth's crust is low, expensive and toxic, which is not conducive to environmentally friendly development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of the modified BN-coated cobalt-free Ni-Mn solid-solution nickel-based positive electrode material comprises the following steps:

[0035] (a) NiSO 4 , MnSO 4 Dissolve in deionized water according to the formula, prepare 1~10mol / L transition metal source solution, add ammonia water accounting for 5% of NaOH solution volume to 4mol / L NaOH solution, mix transition metal source solution and sodium hydroxide solution At the same time, pump it into the reactor at a flow rate of 50mL / h, and react at 55°C and pH 11.3. After the reaction, continue to stir at 55°C for 3h, then let it stand for 8h, and wash it with deionized water while suction filtering Precipitate until the impurity content of the precipitate is less than 400ppm, and obtain the precursor Ni after drying x mn 1-x (OH) 2 .

[0036] (b) The precursor and lithium hydroxide are mixed according to the ratio of the moles of lithium to the total moles of nickel and manganese of 1:1, and wa...

Embodiment 1

[0040] A lithium-ion battery comprising a cobalt-free Ni-Mn solid-solution nickel-based positive electrode material, the battery cell of the lithium-ion battery includes: a positive pole piece, a negative pole piece, and a battery between the positive pole piece and the negative pole piece Separator, the positive electrode sheet includes positive electrode current collector aluminum foil and the compacted density of the positive electrode slurry formed on both sides of the aluminum foil is 3.6g / cm 3 positive electrode coating layer, the negative electrode sheet includes negative electrode current collector and negative electrode slurry formed on both sides of the negative electrode current collector with a compacted density of 1.45g / cm 3 negative electrode coating layer.

[0041] The positive electrode slurry comprises the following composition in parts by weight: 18 parts of positive electrode solvent, 82 parts of positive electrode active material, 13 parts of positive elect...

Embodiment 2

[0053] A lithium-ion battery comprising a cobalt-free Ni-Mn solid-solution nickel-based positive electrode material, the battery cell of the lithium-ion battery includes: a positive pole piece, a negative pole piece, and a battery between the positive pole piece and the negative pole piece The diaphragm, the positive pole piece includes positive current collector aluminum foil and positive slurry formed on both sides of the aluminum foil with a compacted density of 3.5g / cm 3 The positive electrode coating layer, the negative electrode sheet includes negative electrode current collector and negative electrode slurry formed on the surface of both sides of the negative electrode current collector, the compacted density is 1.55g / cm 3 negative electrode coating layer.

[0054] The positive electrode slurry comprises the following composition in parts by weight: 15 parts of positive electrode solvent, 85 parts of positive electrode active material, 10 parts of positive electrode con...

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Abstract

The invention relates to the technical field of secondary batteries, and discloses a lithium ion battery having a cobalt-free Ni-Mn solid solution nickel-based positive electrode material. The batterycell of the lithium ion battery comprises a positive electrode piece, a negative electrode piece, and a diaphragm between the positive electrode piece and the negative electrode piece, wherein the positive electrode piece comprises a positive electrode current collector aluminum foil, and positive electrode coating layers having a compaction density of 3.5 to 3.6g / cm3 and formed on the surfaces of the two sides of the aluminum foil by positive electrode paste; the negative electrode piece comprises a negative electrode current collector, and negative electrode coating layers having a compaction density of 1.45 to 1.65 g / cm3 and formed on the surfaces of the two sides of the negative electrode current collector by negative electrode paste. The surface of the positive electrode material iscoated with modified BN. The coating layer can effectively block the direct contact between the positive electrode material and an electrolyte, has good acid resistance, can inhibit the manganese ionsin the material from dissolving in the electrolyte, can stabilize the material structure, and improves the cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a lithium ion battery containing cobalt-free Ni-Mn solid-solution nickel-based positive electrode materials. Background technique [0002] The energy density of lithium-ion batteries, that is, the amount of energy stored per unit weight of the battery, often depends on the specific capacity of the positive electrode material. At present, commercial lithium-ion batteries mainly use lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ) etc. as the positive electrode material, the specific capacity is only 90-140mAhg -1 , it is difficult to meet the high energy density requirements of power batteries, and cobalt resources are limited and toxic, which is contrary to environmental friendliness. LiNiO 2 Has a higher actual specific capacity (190-210mAhg -1 ), a layered α-NaFeO 2 structure, but its thermal stability is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈单任宁夏小燕常林荣常福荣
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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