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Cheap and environment-friendly lithium ion battery with high safety

A lithium-ion battery, high-safety technology, applied in the field of lithium-ion batteries, can solve the problems of high environmental pollution, high price, and the inability to balance the relationship between safety and price, and achieve the effect of low cost and high safety

Pending Publication Date: 2022-03-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high price of these organic salts is not conducive to the large-scale production of lithium-ion batteries
Moreover, fluorine-containing organic salts have a greater impact on environmental pollution, which is not conducive to the sustainable development of batteries
[0004] In response to these problems, although many researchers have conducted research, they still cannot better balance the relationship between security and price.

Method used

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  • Cheap and environment-friendly lithium ion battery with high safety
  • Cheap and environment-friendly lithium ion battery with high safety

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Trimethyl phosphate (TMP), fluoroethylene carbonate (FEC), and ethyl methyl carbonate (EMC) were mixed according to a volume ratio of 1:1:2, and then lithium nitrate was added to form a 1mol / L solution. Put the prepared electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. LiFePO 4 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (LiFePO 4 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surface of carbon-coated aluminum foil to form a positive electrode sheet. Secondly, lithium metal (Li) was used as the negative electrode material, and Celgard2500 film was used as the separator to assemble a 2032 button battery. At room temperature of 25°C and a current density of 1C, the first-cycle capacity is 165mAh / g. After 500 cycles, the capacity retention rate reaches 92%, and the average...

Embodiment 2

[0024] Mix trimethyl phosphate (TMP), fluoroethylene carbonate (FEC), and ethyl methyl carbonate (EMC) in a volume ratio of 1:1:2, and then add 30% volume ratio of acrylic acid to the homogeneous solution Butyl ester monomer, then add lithium nitrate to make a 1mol / L solution. Azobisisobutyronitrile (AIBN) was then dissolved in the solution as a thermal initiator. The resulting solution was injected into glass molds with silicone spacers. Finally, the electrolyte was heated at 70 °C for 12 h to obtain a quasi-solid state highly concentrated electrolyte. Put the prepared quasi-solid electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. LiFePO 4 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (LiFePO 4 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surface of carbon-coated aluminum fo...

Embodiment 3

[0026]Diethyl carbonate (DEC) and triethyl phosphate (TEP) were mixed according to a volume ratio of 3:1, and then lithium sulfate was added as a solute to prepare an electrolyte solution with a concentration of 1 mol / L. Put the prepared electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. LiFePO 4 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (LiFePO 4 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surface of carbon-coated aluminum foil to form a positive electrode sheet. Secondly, with TiO 2 as the negative active material. TiO 2 : conductive agent (superP): binder (sodium carboxymethyl cellulose CMC) = 80:10:10 mixed slurry, coated on the surface of copper foil to form a negative electrode sheet. A 2032 coin cell was assembled using Celgard 2500 film as a separator. At room ...

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Abstract

The invention belongs to the field of an electrochemical technology, and particularly relates to a low-cost and environment-friendly lithium ion battery with high safety. The lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte comprises inorganic lithium salt without fluorine element, an ester solvent and a flame retardant; the flame retardant is one or more of trimethyl phosphate, triethyl phosphate, tributyl phosphate, dimethyl methylphosphate, diethyl ethyl phosphate, diphenyl isopropylphenyl phosphate and hexamethylphosphoramide. The lithium ion battery provided by the invention does not involve fluorine-containing salt, and the electrolyte is non-combustible, so that compared with the traditional lithium ion battery, the lithium ion battery shows the characteristics of safety, low cost and environment friendliness, and has certain application prospects in the aspects of large energy storage and power batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion battery with high safety, low cost and environmental protection. Its electrolyte is nonflammable and uses inorganic lithium salts (such as lithium nitrate or lithium sulfate) that do not contain fluorine as electrolytes. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly and have been widely used in various industries. Especially in new energy vehicles, lithium-ion batteries have become an indispensable part of the power system. However, with the popularization of the use of lithium-ion batteries, people have also put forward higher and higher requirements for lithium-ion batteries. How to improve the safety of lithium-ion batteries and reduce their cost has become an unavoidable problem. As an important part of lithium-ion batteries, the electrolyte has become the focus of people's attention. [0003] Elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/056
CPCH01M10/0525H01M10/056H01M2300/002Y02E60/10
Inventor 王永刚周康
Owner FUDAN UNIV
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