High energy density lithium ion power battery

A high energy density, power battery technology, applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problem that the energy density has not been improved better, the charge and discharge cut-off voltage cannot be broken through, and the limitation of lithium-ion power batteries Application and other issues, to achieve the effect of improving cycle performance at room temperature and high pressure

Inactive Publication Date: 2014-04-23
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the current lithium-ion power battery because the energy density has not been better improved, resulting in the charge-dischar...

Method used

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Examples

Experimental program
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preparation example Construction

[0030] 24 Preparation of:

[0031] (1) Take a certain amount of silicon powder with a particle size of 0.1-5μm, press Si-SnC 2 o 4 Medium Si and SnC 2 o 4 The mass ratio is 1-10:1 to calculate and take the required amount of soluble stannous salt, dissolve silicon powder and soluble stannous salt (stannous chloride or stannous sulfate) in water, stir evenly, and obtain a suspension , dissolving soluble oxalate (potassium oxalate, sodium oxalate or ammonium oxalate) in water to obtain a soluble oxalate solution;

[0032] (2) According to the molar ratio of soluble stannous salt to soluble oxalate is 1:1-1.3, pour the soluble oxalate solution into the suspension and adjust the pH of the whole reaction system to 0.5-3, and keep stirring for 1 -3h, to obtain the reaction solution;

[0033] (3) Separating the reaction liquid from solid to liquid, and washing the obtained solid with water and drying it at a temperature of 80-100°C to obtain Si-SnC 2 o 4 .

[0034] Prepar...

Embodiment 1

[0048] Prepare the positive electrode sheet: mix 92 parts by weight of high-nickel high-capacity ternary material (Li 1.04 Ni 0.8 co 0.15 Al 0.05 o 2 ), 2 parts by weight of conductive carbon black SP, 2 parts by weight of carbon nanotubes (CNT), and 4 parts by weight of polyvinylidene fluoride (PVDF), and added 80 parts by weight of N-N-dimethylpyrrolidone and stirred to form a slurry , uniformly coated on the calendered aluminum foil of the positive electrode base fluid, and rolled with a rolling machine after drying to make the positive electrode sheet.

[0049] Prepare the negative electrode sheet: mix 90 parts by weight of the C-Sn-Si high-capacity composite material (Si-SnC 2 o 4 ), 2 parts by weight of conductive carbon black SP and 8 parts by weight of polyvinylidene fluoride (PVDF), and add 140 parts by weight of N-N-dimethylpyrrolidone and stir to form a slurry, which is evenly coated on the negative electrode base fluid electrolytic copper foil After drying, i...

Embodiment 2

[0056] Prepare the positive electrode sheet: mix 92 parts by weight of high-nickel high-capacity ternary material (Li 1.04 Ni 0.8 co 0.15 Al 0.05 o 2 ), 2 parts by weight of conductive carbon black SP, 2 parts by weight of carbon nanotubes (CNT), and 4 parts by weight of polyvinylidene fluoride (PVDF), and added 80 parts by weight of N-N-dimethylpyrrolidone and stirred to form a slurry , uniformly coated on the calendered aluminum foil of the positive electrode base fluid, and rolled with a rolling machine after drying to make the positive electrode sheet.

[0057] Prepare the negative electrode sheet: mix 92 parts by weight of C-Sn-Si high-capacity composite material (Si-SnC 2 o 4 ), 2 parts by weight of conductive carbon black SP and 6 parts by weight of polyacrylic acid, and add 130 parts by weight of deionized water to stir to form a slurry, which is evenly coated on the negative electrode base fluid electrolytic copper foil, and after drying, use a roller compactor ...

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Abstract

The invention relates to the technical field of a lithium ion power battery, and particularly relates to a high energy density lithium ion power battery including a positive electrode, a diaphragm, a negative electrode and an electrolyte, the negative electrode includes a negative electrode current collector and a negative electrode active material, the negative electrode active material is a Si-SnC2O4 high capacity composite material, and a positive electrode active material is high nickel and high capacity of ternary material Li[n]Ni[x]A[y]B[z]O[2]. The battery energy density, the battery charging cut-off voltage and the battery room temperature high pressure cycling performance of the high energy density lithium ion power battery are improved substantially.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, in particular to a lithium-ion power battery with high energy density. Background technique [0002] Compared with other batteries, lithium-ion power batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. The structure of a general lithium-ion power battery is: in the form of laminations, a battery cell is formed by interleaving the positive electrode, separator, and negative electrode (or the battery is made in the form of winding), and then connected to the external terminal and placed in a hard case (such as Plastic shell, steel shell, aluminum shell) or aluminum plastic film, inject electrolyte. For traditional lithium-ion power batteries, the positive electrode is generally made of nickel-cobalt lithium manganese oxide, lithium iron phosphate, lithium mangan...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M4/505H01M4/58
CPCY02E60/122H01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567Y02E60/10Y02P70/50
Inventor 颜雪冬马兴立潘美姿
Owner NINGBO VEKEN BATTERY
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