High-energy-density lithium ion battery

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to firmly bond silicon negative electrodes, poor battery cycle performance, etc.

Inactive Publication Date: 2019-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the volume of the existing silicon negative electrode changes greatly during charging and discharging, and the binder cannot firmly bond the silicon negative electrode

Method used

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Examples

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Embodiment 1

[0050] This embodiment is used to illustrate a lithium ion battery disclosed in the present invention and its preparation method.

[0051] 1) Preparation of electrolyte

[0052] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF6) to the molar concentration to 1 mol / L, and then add 5% of the fluorinated cyclic carbonate represented by structural formula 3 based on the total mass of the electrolyte.

[0053] 2) Preparation of positive electrode

[0054] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.8 co 0.1 mn 0.1 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The positive electrode slurry was uniformly coated on the aluminum foil, dried, ca...

Embodiment 2～12

[0063] Examples 2 to 12 are used to illustrate the lithium-ion battery disclosed in the present invention and its preparation method, including most of the operating steps in Example 1, the difference is that: the total amount of the negative active material, conductive agent and binder The mass percentage is 100%, the mass percentage of the conductive agent is fixed at 1%, and the mass percentage of the negative electrode active material changes with the ratio of the binder. The mass percentage and molecular weight of the binder are shown in Table 1. In addition, the fluorinated cyclic carbonate and mass percentage in the electrolyte are listed in Table 1.

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Abstract

The invention discloses a high-energy-density lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte. The negative electrodecomprises a negative electrode active material, a conductive agent and a binder, the binder comprises a polymer shown in the structural formula I, and the electrolyte contains a fluorine-substituted cyclic carbonate compound shown in the structural formula II. The binder and fluorine-substituted cyclic carbonate are used together so that side effects caused by repeated expansion and contraction ofa SiO/artificial graphite negative electrode can be inhibited more effectively, SiO/artificial graphite active substances, the conductive agent and a current collector are bonded together more firmly, rapid growth of the internal resistance of the battery is inhibited, and therefore the high-temperature cycling performance of the battery is 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] Lithium-ion batteries are widely used in the field of 3C consumer electronics because of their high energy density, high power, long cycle life and no memory effect. As countries vigorously advocate new energy and low-carbon economy, and with the rapid growth of electric vehicles and energy storage equipment, lithium-ion batteries have great application prospects. [0003] With the development needs of the market, higher requirements are put forward for the energy density of lithium-ion batteries. To increase the energy density of lithium-ion batteries, one of the most effective ways is to use positive and negative materials with higher gram capacity, such as using high-nickel materials as positive electrode materials, and silicon materials or silicon-carbon composite materials as negative electrod...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0567H01M10/0525
CPCH01M4/622H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 胡时光王朝阳易欢杨宇邓永红
Owner SOUTH CHINA UNIV OF TECH
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