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Lithium ion battery and preparation method

A technology of lithium ion batteries and lithium salts, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc. problems, to achieve the effect of long service life, high safety and excellent performance

Active Publication Date: 2019-05-03
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the current energy storage lithium-ion batteries still cannot meet the needs of energy storage batteries for safety, cost, and service life in a good balance. Short life, etc., seriously hinder the development of energy storage batteries

Method used

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  • Lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The lithium ion battery includes: a positive pole, a negative pole, a diaphragm, an electrolyte, a casing and a cover plate. Wherein, the positive electrode includes: a positive electrode active material, a conductive agent, a binder and an aluminum foil, and the thickness of the aluminum foil is 12 μm. The positive electrode active material is a nickel-cobalt-manganese ternary material with a percentage of nickel being 50%, the conductive agent is conductive carbon black and carbon nanotubes, and the binder is polyvinylidene fluoride. The mass percentages of positive electrode active material, conductive agent and binder in the positive electrode are respectively: the mass percentage of nickel-cobalt-manganese ternary material is 96%, the mass percentage of polyvinylidene fluoride is 2%, and the mass percentage of conductive carbon black is 1.5% %, the mass percentage of carbon nanotubes is 0.5%.

[0073] The negative electrode includes: negative electrode active mate...

Embodiment 2

[0087] The lithium ion battery of this embodiment is the same as that of Embodiment 1, except that the percentage of nickel in the nickel-cobalt-manganese ternary material is 53%.

Embodiment 3

[0089]The lithium ion battery of this embodiment is the same as that of Embodiment 1, except that the degree of graphitization of graphite is 92.5%, and the OI value is 6.7.

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Abstract

The invention provides a lithium ion battery and a preparation method. The lithium ion battery includes a positive electrode, a negative electrode, a diaphragm, and an electrolyte. The positive electrode and the negative electrode are separated by the diaphragm; the positive electrode, the negative electrode and the diaphragm are encapsulated in an enclosed space; the electrolyte is filled in theenclosed space; the positive electrode includes a positive active material, the positive active material includes a nickel-cobalt-manganese ternary material, and the percentage of the amount of a substance of nickel in the nickel-cobalt-manganese ternary material is 50-60%; the negative electrode includes a negative active material, the negative active material includes graphite, and the degree ofgraphitization of the graphite is 91-94%, and an OI value is 6-7; and the electrolyte includes a lithium salt, a solvent and an additive, wherein the lithium salt includes lithium hexafluorophosphateand lithium bis(fluorosulfonyl)imide, the solvent includes ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and propyl propionate, and the additive includes lithium difluorophosphate, lithium bis(oxalate)borate, tris(trimethylsiloxy)boron, vinylene carbonate, and succinonitrile. The lithium ion battery has the characteristics of high safety, low cost, long service life and excellentusage performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a preparation method. Background technique [0002] Clean energy has the advantages of green, environmental protection, and sustainable development. New energy, as a representative of clean energy, is an important pillar of the third industrial revolution. As an important role of new energy, energy storage batteries have extensive application requirements and prospects in various fields such as large-scale energy storage, household energy storage, commercial energy storage, and power storage. Among all energy storage batteries, electrochemical storage is the most widely used one, and lithium metal elements and sodium metal elements are the most commonly used, typical representatives are lithium-ion batteries and sodium-ion batteries, currently commercially available Mainly lithium-ion batteries. [0003] High safety, low cost, and long se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0566H01M10/058
CPCY02E60/10Y02P70/50
Inventor 刘祥哲王洪伟
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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