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Preparation method of manganese-vandium composite anode of lithium ion battery

A lithium-ion battery and composite positive electrode technology, which is applied in the field of preparation of lithium-ion battery positive electrodes, can solve the problems of unstable lithium vanadate layered structure, poor storage performance, and fast capacity decay, and achieve good cycle stability and long service life The effect of long and high specific capacity

Inactive Publication Date: 2013-02-06
SHANGHAI JINZHONG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high-temperature cycle performance is poor, it has certain solubility in the electrolyte, its storage performance is poor, and its poor electrochemical stability greatly limits its industrialization.
[0004] Vanadium-based cathode materials have low cost, good cycle performance, and high cycle specific capacity. Both vanadium pentoxide and lithium vanadate are good cathode materials for lithium-ion batteries. Lithium vanadate has a large theoretical capacity, and each lithium vanadate unit More than 3 lithium ions can be embedded, and the actual capacity can reach more than twice that of lithium cobaltate. However, because vanadium in lithium vanadate has multiple oxidation states, there are multiple discharge platforms, which limits the application of the material. In addition, lithium vanadate The layered structure is unstable, the capacity decays quickly, and the cycle performance needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of vanadium lithium manganate material doped with rare earth gadolinium

[0025] Weigh lithium oxalate, vanadium pentoxide, ammonium dihydrogen phosphate, manganese dioxide, and carbon black according to the molar ratio of lithium, vanadium, phosphorus, manganese, and carbon elements to 2:1:1:1:1. After mixing, add Gadolinium oxide with a mass percentage of 5% of the mixture is put into a nano grinder for grinding, and the powder particles are ground to 30nm.

[0026] Put the ground powder in a muffle furnace and slowly heat it to 600°C and keep it warm for 6 hours, then pass a mixed gas of hydrogen and nitrogen, heat up to 900°C and calcined for 8 hours, cool naturally to room temperature, and grind it into a 20μm powder. Put it into a reaction kettle, keep it at a temperature of 1000° C. for 2 hours under a nitrogen atmosphere, and obtain gadolinium-doped lithium vanadium manganate through high-temperature treatment.

[0027] Prepare positive electrode sl...

Embodiment 2

[0037] Preparation of vanadium lithium manganate material doped with rare earth gadolinium

[0038] Weigh lithium oxalate, vanadium pentoxide, ammonium dihydrogen phosphate, manganese dioxide, and carbon black according to the molar ratio of lithium, vanadium, phosphorus, manganese, and carbon elements to 2:1:1:1:1. After mixing, add Gadolinium oxide with a mass percentage of 3% of the mixture is put into a nano grinder for grinding, and the powder particles are ground to 20nm.

[0039] Put the ground powder in a muffle furnace and slowly heat it to 400°C and keep it warm for 6 hours, then pass a mixed gas of hydrogen and nitrogen, heat up to 800°C and calcined for 8 hours, cool naturally to room temperature, and grind it into a 10μm powder. Put it into a reaction kettle, keep it at a temperature of 900° C. under a nitrogen atmosphere for 3 hours, and obtain gadolinium-doped lithium vanadium manganate through high-temperature treatment.

[0040] Prepare positive electrode slu...

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Abstract

The invention discloses a preparation method of a manganese-vandium composite anode of a lithium ion battery. The preparation method comprises the following steps of: weighing lithium oxalate, vanadium pentoxide, ammonium dihydrogen phosphate, manganese dioxide and carbon black, mixing, adding an obtained mixture into gadolinium oxide accounting for 3-5% relative to the mass of the mixture, and processing at high temperature to obtain gadolinium-doped vanadium lithium manganate; preparing anode slurry by taking N-methyl pyrrolidone as a solvent; and coating an anode to obtain an anode piece. According to the manganese-vandium composite anode of the lithium ion battery, prepared according to the invention, due to adoption of the gadolinium-doped vanadium lithium manganate material and special material proportion, the manganese-vandium composite anode is good in cyclic stability while achieving high specific capacity, and is high in specific capacity and long in service life when applied to the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode of a lithium ion battery, in particular to a manganese vanadium composite positive electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green, environmentally friendly and renewable chemical energy with excellent performance. At present, they are rapidly occupying applications such as mobile phones, notebook computers, small video cameras, digital cameras, power tools, and electric vehicles with incomparable advantages over other batteries. field, and may replace nickel-cadmium and nickel-hydrogen batteries for the aerospace field. [0003] The cathode material is the key material in lithium-ion batteries. The cathode materials of lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement. The ternary material has high energy density and good s...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 姜波
Owner SHANGHAI JINZHONG INFORMATION TECH