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A lithium-ion battery with enhanced cycle performance

A lithium-ion battery, cycle performance technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve the problems that affect the electrochemical performance of high-voltage positive electrode materials, less research on electrolyte, poor cycle performance, etc., to achieve Effects of strengthening contact, reducing contact resistance, and enhancing cycle performance

Active Publication Date: 2018-01-23
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the negative electrode materials of commercial lithium-ion batteries are all carbon materials, mainly petroleum coke and graphite, and the representative ones are Sony's petroleum coke negative electrode materials, but the capacity is low, and A&T's A&T company with poor cycle performance The anode material is a high-capacity graphitized metastable phase pitch-based carbon fiber
At present, there are more and more positive electrode materials with high discharge capacity and high voltage platform, but there are relatively few studies on matching electrolytes. The continuous decomposition of traditional electrolytes affects the electrochemical performance of high voltage positive electrode materials. Therefore, research on electrolytes equally important

Method used

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  • A lithium-ion battery with enhanced cycle performance

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Effect test

Embodiment 1

[0013] The cathode material is Li 1.35 co 0.4 Fe 0.07 al 0.13 V 0.22 o 2.7 / C, the anode material is Ca 0.35 Sb 0.3 Si 0.1 C 0.37 . The battery diaphragm adopts polymer-electrospinning composite diaphragm, and the hard polymer material is used as the diaphragm matrix, and the flexible diaphragm is prepared by electrospinning on its surface. The hard polymer material is a mixture of polyethylene and polypropylene, and the electrospinning material is a mixture of hydroxymethyl cellulose and nylon.

[0014] The preparation method of the negative electrode material is as follows: Weigh the raw materials in proportion and mix them evenly, and use a high-energy planetary ball mill for ball milling. The ball milling speed is 450rpm, and the time is 2 hours. Select ball milling to obtain a particle size of less than 30 microns for use.

Embodiment 2

[0016] The cathode material is Li 1.34 co 0.38 Fe 0.06 al 0.12 V 0.2 o 2.6 / C, the anode material is Ga 0.33 Sb 0.3 B 0.12 C 0.35 . The battery diaphragm adopts polymer-electrospinning composite diaphragm, and the hard polymer material is used as the diaphragm matrix, and the flexible diaphragm is prepared by electrospinning on its surface. The hard polymer material is a mixture of polyethylene and polypropylene, and the electrospinning material is a mixture of hydroxymethyl cellulose and nylon.

[0017] The preparation method of the negative electrode material is as follows: Weigh the raw materials in proportion and mix them uniformly, and use a high-energy planetary ball mill for ball milling at a ball milling speed of 400 rpm for 2 hours, and choose ball milling to obtain a particle size of less than 30 microns for use.

Embodiment 3

[0019] The cathode material is Li 1.35 co 0.4 Fe 0.07 al 0.13 V 0.22 o 2.7 / C, the anode material is Ca 0.35 Sb 0.3 Si 0.1 C 0.37 . A commercially available lithium-ion battery separator was used (the separator was purchased from Xinxiang Green).

[0020] The preparation method of the negative electrode material is as follows: Weigh the raw materials in proportion and mix them evenly, and use a high-energy planetary ball mill for ball milling. The ball milling speed is 450rpm, and the time is 2 hours. Select ball milling to obtain a particle size of less than 30 microns for use.

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Abstract

The invention discloses a lithium ion battery with enhanced cycle performance. The positive electrode material is LixCoaFebAlcVdOy / C, wherein x=1~2, y=2~4, a=0.3~0.5, b=0.05‑0.1, c=0.1 ~0.2, d=0.2~0.3; negative electrode material is MaSbbYcCd, wherein M is selected from Ca and / or Ga, Y is selected from Si and / or B, C is graphite, a=0.3‑0.45, b=0.2‑0.35, c is 0.08~0.15, and d is 0.25~0.4; the battery separator adopts polymer-electrospinning composite diaphragm, and the rigid polymer material is used as the diaphragm matrix, and the flexible diaphragm is prepared by electrospinning on its surface. The cycle performance of the battery can be obviously improved through the battery of the invention.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery with enhanced cycle performance. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high working voltage, and no memory effect. With the rapid development of electronic technology, people have higher and higher performance requirements for lithium-ion batteries. come higher. [0003] Lithium batteries contain an active cathode material, an active anode material, and a separator. The currently commercialized anode materials for lithium-ion batteries are mainly layered LiCoO 2 , but due to the increasingly scarce cobalt resources, the cost increases. In addition, its safety performance is poor and it is not suitable for making high-capacity batteries; active cathode materials for lithium batteries such as LiCoO 2 , LiMnO 2 , LiNi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M4/36H01M4/485H01M4/525H01M4/58H01M4/587H01M10/0525H01M50/449
CPCH01M4/364H01M4/485H01M4/525H01M4/58H01M4/587H01M10/0525H01M50/449Y02E60/10
Inventor 程丽平刘传玺朱景星王淑霞
Owner SHANDONG UNIV OF SCI & TECH