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Lithium ion battery with high energy density

A lithium-ion battery, high energy density technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of low density, high safety hazards, poor uniformity, etc., to achieve high density, process controllable and consistent strong effect

Pending Publication Date: 2017-07-18
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the defects of poor uniformity, low density and high safety hazards in the current negative electrode sheet lithium supplementation, the purpose of the present invention is to provide a negative composite electrode with high efficiency, high gram capacity and high compaction density for the first time. sheet, and applied to Li-ion battery

Method used

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  • Lithium ion battery with high energy density
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  • Lithium ion battery with high energy density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Ⅰ. Preparation of hard carbon composite electrodes:

[0026] First, weigh 85g of hard carbon material and add it to 15g of polyvinylidene fluoride and 50g of N-methylpyrrolidone, stir evenly to obtain a sticky colloid, and press it onto the surface of foamed copper, and obtain a hard carbon composite electrode A after drying ;

[0027] Ⅱ. Electrodeposition of hard carbon composite electrodes:

[0028] Add 144g of lithium difluorooxalate borate to 1000ml of ethyl methyl carbonate to configure a 0.1mol / L solvent, then use the hard carbon composite electrode A as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel as the reference electrode, and Cyclic voltammetry (scanning speed 0.5mV / s, voltage range -2V-2V, scanning for 20 cycles) deposited lithium salt on the surface of its hard carbon composite electrode A, and finally obtained a hard carbon composite electrode B containing lithium difluorooxalate borate ;

[0029] Ⅲ. H...

Embodiment 2

[0032] Ⅰ. Preparation of hard carbon composite electrodes:

[0033] First, weigh 80g of hard carbon material and add it to 20g of polyvinylidene fluoride and 50 parts of N-methylpyrrolidone, stir evenly to obtain a sticky colloid, and press it onto the surface of copper foam. After drying, a hard carbon composite electrode A is obtained. ;

[0034] Ⅱ. Electrodeposition of hard carbon composite electrodes:

[0035] Add 94g of lithium tetrafluoroborate to 1000ml of ethyl methyl carbonate to configure a 0.1mol / L solvent, then use the hard carbon composite electrode A as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel as the reference electrode, and use The constant voltage method (voltage 1.8V, time 20min) deposits lithium salt on the surface of the hard carbon composite electrode A, and finally obtains the hard carbon composite electrode B containing lithium tetrafluoroborate;

[0036] Ⅲ. Hard carbon composite electrode coating...

Embodiment 3

[0039] Ⅰ. Preparation of hard carbon composite electrodes:

[0040] First, weigh 90g of hard carbon material and add it to 10g of polyvinylidene fluoride and 50 parts of N-methylpyrrolidone, stir evenly to obtain a sticky colloid, and press it onto the surface of copper foam. After drying, a hard carbon composite electrode A is obtained. ;

[0041] Ⅱ. Electrodeposition of hard carbon composite electrodes:

[0042] Add 144g of lithium difluorooxalate borate to 1000ml of ethyl methyl carbonate to configure a 0.1mol / L solvent, then use the hard carbon composite electrode A as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel as the reference electrode, and A constant current method (current density 20mA / cm2, time 30min) was used to deposit lithium salt on the surface of the hard carbon composite electrode A, and finally a hard carbon composite electrode B containing difluorooxalate lithium borate was obtained;

[0043] Ⅲ. Hard car...

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Abstract

The invention belongs to the field of preparation of a lithium ion battery, and particularly relates to a lithium ion battery with high energy density. The lithium ion battery comprises a ternary positive electrode material, a hard carbon composite negative pole plate, a ceramic separator and a functional electrolyte, wherein the preparation method of the hard carbon composite negative pole plate comprises the steps of depositing a lithium salt on a surface of a hard carbon electrode, preparing a hard carbon / lithium salt composite pole plate, coating a surface of the hard carbon / lithium salt composite pole plate with an organic polymer, and preparing a hard carbon composite pole plate containing the lithium salt and the polymer coating layer. Lithium supplementary is performed on the surface of the hard carbon pole plate by an electrochemical method, the initial efficiency of hard carbon can be substantially improved, the transmission quantity of lithium ions during the charge-discharge process is increased, and the rate performance of the lithium ion battery is improved; and meanwhile, a shell is coated with a special polymer material, the lithium salt on a surface of the material is prevented from being in contact with outside air, and the processability and the safety of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery with high energy density. Background technique [0002] With the rapid development of electric vehicles and digital electronic products, lithium-ion batteries used in these products are required to have higher energy density in order to improve the cruising range of electric vehicles and the running time of digital products. At present, there are mainly methods to improve the energy density of lithium-ion batteries: 1) Using high-capacity positive and negative electrode materials, because its actual gram capacity is close to the theoretical capacity, it is difficult to greatly increase it at present; 2) Using high-voltage electrolyte, but the stability is poor , Difficult to industrialize; 3) Using thinner separators and current collectors, but due to technical difficulties, it is currently difficult to achieve significant improvement or a small improvem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/133H01M4/1393H01M4/04H01M10/0525
CPCH01M4/0419H01M4/0452H01M4/133H01M4/1393H01M4/366H01M4/62H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 黄国林王建琴
Owner 江苏元景锂粉工业有限公司
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