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A lithium ion battery

A lithium-ion battery and lithium manganate technology, which is applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as low compaction density and gram capacity, limit large-scale application, and complex manufacturing process, and achieve particle size Uniform distribution, improved fast charging performance, and high conductivity

Active Publication Date: 2021-07-13
宁波维科新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered high-nickel ternary 81 1 has become the preferred cathode material for the next generation of high-energy density and low-cost batteries due to its high specific capacity and low cobalt content. However, due to its complex manufacturing process and high environmental requirements, the material is easy to absorb moisture , leading to the problem of swelling in the late stage of long-term cycle, especially high-temperature cycle, which is temporarily in the experimental stage in the field of power batteries and has not been applied in large quantities.
Spinel lithium manganese oxide has lower cost, better safety performance, simpler processing performance and a discharge platform up to 3.8V, but its compaction density and gram capacity are low, resulting in low energy density, which limits its large scale application

Method used

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Examples

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preparation example Construction

[0031] Positive electrode preparation: first dissolve the PAA binder into the PEG solvent, then add the positive electrode active material and conductive agent according to Table 1 Example 1 and mix them in an agate jar, place them in a planetary ball mill and stir and mix to obtain the positive electrode slurry, and use The coating machine applies the positive electrode slurry on the carbon-coated aluminum foil current collector, vacuum-dries and volatilizes the PEG, and then rolls the coated electrode, cuts it, and then vacuum-dries it to obtain the positive electrode sheet of the lithium-ion battery; wherein, the NCM811 NCM811 coated with N-doped nanocellulose composite. The preparation method of the NCM811 comprises the steps of: taking NiSO by molar ratio 8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, add NaOH solution for co-precipitation reaction, adjust pH, vacuum filter and wash, then dry, then add N-doped nanocellulose, mix and ball mill for 6 hours to obtai...

Embodiment 2

[0035] Positive electrode preparation: first dissolve the PAA binder into the PEG solvent, then add the positive electrode active material and conductive agent according to Table 1 Example 2 and mix them in an agate jar, place them in a planetary ball mill to stir and mix to obtain the positive electrode slurry, and use The coating machine applies the positive electrode slurry on the carbon-coated aluminum foil current collector, vacuum-dries and volatilizes the PEG, and then rolls the coated electrode, cuts it, and then vacuum-dries it to obtain the positive electrode sheet of the lithium-ion battery; wherein, the NCM811 NCM811 coated with N-doped nanocellulose composite. The preparation method of the NCM811 comprises the steps of: taking NiSO by molar ratio 8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, add NaOH solution for co-precipitation reaction, adjust pH, vacuum filter and wash, then dry, then add N-doped nanocellulose, mix and ball mill for 6.2h to obtain pr...

Embodiment 3

[0039] Positive electrode preparation: first dissolve PAA binder into PEG solvent, then add positive electrode active material and conductive agent according to Example 3 in Table 1 and mix them in an agate jar, place them in a planetary ball mill to stir and mix to obtain positive electrode slurry, use The coating machine applies the positive electrode slurry on the carbon-coated aluminum foil current collector, vacuum-dries and volatilizes the PEG, and then rolls the coated electrode, cuts it, and then vacuum-dries it to obtain the positive electrode sheet of the lithium-ion battery; wherein, the NCM811 NCM811 coated with N-doped nanocellulose composite. The preparation method of the NCM811 comprises the steps of: taking NiSO by molar ratio 8:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O, add NaOH solution for co-precipitation reaction, adjust pH, vacuum filter and wash, then dry, then add N-doped nanocellulose, mix and ball mill for 6.5h to obtain precursor slurry, d...

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Abstract

The invention relates to a lithium-ion battery, in particular to a high-safety fast-charging lithium-ion battery for a mobile power supply, belonging to the field of lithium-ion battery materials. The lithium-ion battery of the present invention includes a positive electrode, a negative electrode, a diaphragm, an electrolyte and a battery casing, the positive electrode includes a current collector and a positive electrode material coated on the surface of the current collector, and the positive electrode active material in the positive electrode material is NCM811 and lithium manganate The mixture, and the number of parts ratio of the two is (2‑3):1. The present invention uses NCM811 and lithium manganese oxide materials in combination, and utilizes the excellent cycle, high temperature, high gram capacity and compaction of NCM811 combined with the high voltage platform of lithium manganate and excellent low temperature, magnification and processing performance to reduce the cost of mobile power and prolong Its service life improves its fast charging performance.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a high-safety fast-charging lithium-ion battery for a mobile power supply, belonging to the field of lithium-ion battery materials. Background technique [0002] Since the second half of 2016, the price of metal cobalt has continued to rise, from 200,000 / ton to 600,000 yuan / ton, and the quotation of MB cobalt, an industry authority, has risen from $13 / lb to $38 / lb, an increase of 200%. , has brought huge cost pressure to downstream battery manufacturers, especially in the field of mobile power applications, which are extremely price-sensitive, and at the same time pursue high energy density and fast charging performance, and have strict requirements on the selection and rational use of material systems . Layered high-nickel ternary 81 1 has become the preferred cathode material for the next generation of high-energy density and low-cost batteries due to its high specific capacity and low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M4/131H01M4/1391H01M10/058B82Y30/00
CPCB82Y30/00H01M4/131H01M4/1391H01M4/364H01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M10/058H01M2004/028Y02E60/10Y02P70/50
Inventor 刘仁虎吴子文曹长河孙珊珊马兴立赵亚
Owner 宁波维科新能源科技有限公司