Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of improving energy density and high-rate charge-discharge characteristics

Inactive Publication Date: 2015-02-11
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, many patents or patent applications have disclosed technical solutions for changing the charging method to increase the charging speed, but there are few reports on fast-chargeable battery chemical systems, especially those involving high energy density.

Method used

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Examples

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Effect test

Embodiment 1

[0038] A lithium ion battery provided in this embodiment includes a positive electrode sheet, a negative electrode sheet, a separator disposed between the positive electrode sheet and the negative electrode sheet, and an electrolyte;

[0039] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer arranged on the surface of the negative electrode current collector. In terms of mass percentage, the negative electrode active material layer includes the following components:

[0040] Negative electrode active material natural graphite 98.5%;

[0041] Negative electrode conductive agent carbon fiber 0.2%;

[0042] Negative electrode conductive agent carbon black 0.1%;

[0043] Negative electrode binder styrene-butadiene rubber 0.7%;

[0044] Negative electrode stabilizer sodium carboxymethylcellulose (CMC) 0.5%;

[0045]The viscosity of the stabilizer is 10000mPa·S;

[0046] The negative electrode current coll...

Embodiment 2

[0065] The difference from Example 1 is: the negative electrode active material is artificial graphite, and its mass content is 99.5%; the negative electrode conductive agent is carbon nanotube, and its mass content is 0.1%; the negative electrode binder is sodium alginate, and its The mass content is 0.2%; the negative electrode stabilizer is hydroxypropyl methylcellulose sodium, and its content is 0.2%, the viscosity is 7000mPa·S, and the additive includes three (pentafluoro Phenyl) borane and 2% VC in a mass ratio accounting for the total mass of the electrolyte, and a lithium salt concentration of 1.1 mol / L, the rest are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0071] Different from Example 1, the negative electrode active material is a mixture of natural graphite and mesocarbon microspheres, the mass ratio of the two is 5:1, and the mass content of the negative electrode active material is 98.8%; the negative electrode conductive agent is carbon nanometer tube and graphene, and the mass content of carbon nanotubes is 0.1%, and the mass content of graphene is 0.1%; the negative electrode binder is polyvinyl alcohol, and the mass content of the negative electrode binder is 0.5%; the negative electrode is stable The agent is sodium hydroxymethyl cellulose, and the mass content of the negative electrode stabilizer is 0.5%, the viscosity of the negative electrode stabilizer is 11000mPa·S, and the additive includes pentafluorophenyl borax, which accounts for 0.5% of the total mass of the electrolyte The acid ester and 2% VC in the mass ratio of the total mass of the electrolyte, the lithium salt concentration is 1.15mol / L, and the rest are...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery. The battery includes a positive plate, a negative plate, isolating films arranged between the positive and negative plates at intervals, and electrolyte. A negative electrode active material includes the following components: 98.1-99.8 percent of a negative electrode active substance, 0-1 percent of a negative electrode conductive agent, 0.1-1 percent of a negative electrode binder and 0.1-1 percent of a negative electrode stabilizer. The viscosity of the stabilizer is 2000mPa.S to 15000mPa.S. The negative electrode conductive agent is at least one of carbon fiber, carbon nanotubes, carbon nanorods and grapheme, or is a mixture of carbon black and at least one of carbon fiber, carbon nanotubes, carbon nanorods, phosphorus graphite and grapheme. In comparison with the prior art, the lithium ion battery has the advantages that the battery energy density is improved and the high rate charging / discharging characteristics are improved on the premise of ensuring that the diaphragm is not stripped.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a lithium-ion battery with high energy density and large-rate charging and discharging characteristics. Background technique [0002] As a clean and environmentally friendly functional component, lithium-ion batteries have been widely used in more and more fields, for example, in the field of consumer electronics, electric vehicles, energy storage systems, and recently emerging Balance bike field, etc. [0003] Among them, consumer electronic products commonly used by people, such as mobile phones and notebook computers, use more and more power, so their requirements for the battery life of lithium-ion batteries are also increasing. The endurance of lithium-ion batteries is mainly reflected in its energy density and charging speed. At present, it is increasingly difficult to increase the energy density of lithium-ion batteries, and expanding the charging speed of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/62H01M4/621H01M4/623H01M10/0525H01M2004/027Y02E60/10
Inventor 高潮王升威陈杰郑强骆福平申红光
Owner DONGGUAN AMPEREX TECH
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