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High-voltage high-magnification lithium ion battery

A lithium-ion battery, high-rate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as failure to meet high-current discharge requirements, battery performance attenuation, poor conductivity, etc., achieve good solubility, reduce Effect of dissolution and improvement of electrical conductivity

Active Publication Date: 2016-02-24
XIAN SAFTY ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the working current exceeds 1C, the modified lithium cobalt oxide required by its patent is not as conductive as lithium cobalt oxide itself due to the metal doping and coating layer, which cannot meet the high current discharge requirements. The metal doping and rich Lithium layered transition metal oxide Li 2 MO 3 The coated modified lithium cobalt oxide material still has structural instability factors under high voltage and high rate discharge, and the battery performance decays quickly after long-term high rate cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of modified lithium cobaltate:

[0028] Step 1, prepare cobalt chloride and chromium sulfate with deionized water into a mixed solution with a total metal ion concentration of 1.0 mol / L, then adjust the pH value of the mixed solution to 11 with sodium hydroxide solution, centrifuge after stirring for 6 hours , to obtain a precipitate; the precipitate was first ultrasonically washed with absolute ethanol, then ultrasonically washed with deionized water to neutrality, and the precipitate after ultrasonically washed with deionized water was dried at 80°C for 12h to obtain a metal ion doped precursor Bulk Cr 0.1 co 0.9 (OH) 2 ; Then the metal ion doping precursor Cr 0.1 co 0.9 (OH) 2 It is mixed with lithium carbonate according to the molar ratio of Li:Co=1.05:1, and calcined at 600°C for 9 hours to obtain metal ion-doped lithium cobaltate Li(Cr 0.1 co 0.9 )O 2 ;

[0029] Step 2, organic carbon source urea and metal ion described in step 1 are doped lit...

Embodiment 2

[0032] Preparation of modified lithium cobaltate:

[0033] Step 1. Prepare cobalt chloride and aluminum sulfate with deionized water to form a mixed solution with a total concentration of metal ions of 1.0 mol / L, then adjust the pH value of the mixed solution to 9 with sodium hydroxide solution, and centrifuge after stirring for 4 hours , to obtain a precipitate; the precipitate was first ultrasonically washed with absolute ethanol, then ultrasonically washed with deionized water to neutrality, and the precipitate after ultrasonic washing with deionized water was dried at 70 ° C for 10 h to obtain a metal ion doped precursor Bulk Al 0.05 co 0.95 (OH) 2 ; Then the metal ion doping precursor Al 0.05 co 0.95 (OH) 2 It is mixed with lithium carbonate according to the molar ratio of Li:Co=1.08:1, and calcined at 800°C for 6 hours to obtain metal ion-doped lithium cobaltate Li(Al 0.05 co 0.95 )O 2 ;

[0034] Step 2, the organic carbon source glucose and metal ions described...

Embodiment 3

[0037] Preparation of modified lithium cobaltate:

[0038] Step 1. Prepare cobalt chloride and nickel sulfate with deionized water to form a mixed solution with a total metal ion concentration of 1.5 mol / L, then adjust the pH value of the mixed solution to 12 with sodium hydroxide solution, and centrifuge after stirring for 2 hours , to obtain a precipitate; the precipitate was first ultrasonically washed with absolute ethanol, then ultrasonically washed with deionized water to neutrality, and the precipitate after ultrasonic washing with deionized water was dried at 70 ° C for 10 h to obtain a metal ion doped precursor Bulk Ni 0.0001 co 0.9999 (OH) 2 ; Then the metal ion doped precursor Ni 0.0001 co 0.9999 (OH) 2 It is mixed with lithium carbonate according to the molar ratio of Li:Co=1.1:1, and calcined at 1000°C for 5 hours to obtain metal ion-doped lithium cobaltate Li(Ni 0.0001 co 0.9999 )O 2 ;

[0039] Step 2, organic carbon source urea and metal ion described i...

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Abstract

The invention discloses a high-voltage high-magnification lithium ion battery. The high-voltage high-magnification lithium ion battery comprises a positive plate, a negative plate, a diaphragm, an electrolyte, a positive pole lug, a negative pole lug and a packaging shell. The positive plate is manufactured by smearing positive slurry containing a positive active material to the two faces of aluminum foil, and the positive active material is modified lithium cobalt oxides with the D50 grain size of 4.0 micrometers to 12.0 micrometers and the specific surface area of 0.5 m<2> / g to 1.2 m<2> / g. The battery has high-magnification discharge capacity and excellent magnification circulating capacity. Compared with a common lithium ion battery with the charge cut-off voltage of 4.35 V, the battery can support high-current discharge of 3 C to 45 C, the discharge ratio is 90% or above, high-current circulation of 3 C to 45 C is adopted at high voltage, and the service life can reach 400 weeks or above.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a high-voltage and high-rate lithium-ion battery. Background technique [0002] At present, lithium-ion batteries have the advantages of high working voltage, high specific energy, light weight, long life, and low self-discharge, and are widely used in various electronic products, power tools, and model toys. Conventional electrical equipment has low operating current and long standby time, and conventional lithium-ion batteries can meet its requirements. For model toys such as car models, aircraft models, and ship models, and electric tools and other electrical equipment, lithium-ion batteries need to continuously provide large currents during work to meet their high power output requirements, which requires the use of high-rate lithium-ion batteries. technology. The patent application No. 200910021703.1 has described this type of product. However, with the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0567
CPCH01M4/366H01M4/525H01M4/625H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王宏宇李君侠杨洪李峰何显峰
Owner XIAN SAFTY ENERGY TECH
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