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Lithium-ion secondary battery and lithium-ion battery containing the electrolyte

A secondary battery and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor low-temperature performance electrolyte system, can not meet the requirements of industrialization, low concentration and conductivity, etc., to achieve increased migration coefficient, good high-temperature cycle performance and low-temperature discharge performance, and the effect of improving flexibility and conductivity

Active Publication Date: 2016-08-24
XIAMEN SHOUNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solubility of lithium bisoxalate borate in carbonate solvent is small, and its low concentration and conductivity cannot meet the requirements of industrialization and increasing energy density; and its low temperature performance is better than that of LiPF 6 Poor electrolyte system for lithium salt

Method used

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  • Lithium-ion secondary battery and lithium-ion battery containing the electrolyte
  • Lithium-ion secondary battery and lithium-ion battery containing the electrolyte
  • Lithium-ion secondary battery and lithium-ion battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of the positive electrode of the lithium-ion secondary battery: Lithium cobaltate, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a certain viscosity of the positive electrode slurry of the lithium-ion secondary battery, and coated on the set On fluid aluminum foil, the coating amount is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, and drying at 85°C for 4 hours under vacuum conditions after slitting, and welding the tabs to make lithium-ion di Secondary battery positive.

[0020] Preparation of lithium-ion secondary battery negative electrode sheet: graphite, conductive agent SuperP, thickener CMC, and adhesive SBR are made into slurry at a mass ratio of 96.5:1.0:1.0:1.5, and coated on the current collector copper foil And dry at 85°C, the coating weight is 0.0089g / cm 2 After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditions a...

Embodiment 2

[0025] The method for preparing lithium ion secondary battery with reference to embodiment 1, just when preparing lithium ion secondary battery electrolyte, diethyl carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), Fluorodiethylcarbonate (FEC), dialkyl pyrocarbonate derivatives (chemical formula II), 18-crown-6 and lithium difluorooxalate borate were mixed according to the mass ratio in Table 1 to obtain the electrolyte solvent. Dissolve 1.5mol / L LiPF in 6 That is, a non-aqueous electrolyte solution is obtained.

Embodiment 3

[0027] The method for preparing lithium ion secondary battery with reference to embodiment 1, just when preparing lithium ion secondary battery electrolyte, diethyl carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), Fluorodiethyl carbonate (FEC), dialkyl pyrocarbonate derivatives (chemical formula III), tetrahydrofuran and bisoxalate lithium borate are mixed according to the mass ratio of Table 1 to obtain the electrolyte solvent, and dissolved in the solvent 0.5mol / LiPF of L 6 That is, a non-aqueous electrolyte solution is obtained.

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Abstract

The invention discloses lithium ion secondary battery electrolyte and a lithium ion battery containing the electrolyte. The electrolyte is prepared from the components in percentage by weight in a non-aqueous solvent: 0.5-20 percent of dialkyl pyrocarbonate derivative, 0.1-20 percent of annular ether compound and 0.1-20 percent of borate lithium salt additive, wherein a structural formula of the dialkyl pyrocarbonate derivative is shown in the specification, and R1 and R2 are one, two or more of alkyl, alkenyl, halogenated alkyl, aryl, aromatic group containing halogen substituent, and oxygen-containing group. With the adoption of the lithium ion secondary battery electrolyte, the dialkyl pyrocarbonate derivative and the annular ether compound are added in the electrolyte, the lithium ion secondary battery electrolyte containing the borate lithium salt additive can be improved; when the lithium ion battery is charged firstly, a stable, dense and flexible SEI (Solid Electrolyte Interference) film can be formed, and the low-temperature discharge performance and the circulation performance of the electrolyte are improved.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery and an electrolytic solution thereof which can improve battery cycle performance. Background technique [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they are widely used in mobile phones. , notebook computers, camcorders, digital cameras and other portable electronic products that emphasize thinness, shortness, and multi-function are rapidly popularized. [0003] Graphite is the most commonly used negative electrode material for lithium-ion batteries, and it is also the most widely used electrode material at present. During the first charging process of the battery, the lithium ions released by the lithium-transi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 胡念王阿忠赖彩娥
Owner XIAMEN SHOUNENG TECH