Intelligent high-safety lithium-on battery with polymer skeleton

A technology of lithium-ion batteries and smart polymers, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of avoiding thermal volatilization and decomposition, small internal resistance, and superior electrochemical performance

A technology of lithium-ion batteries and smart polymers, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of avoiding thermal volatilization and decomposition, small internal resistance, and superior electrochemical performance

CN106531971AInactive Publication Date: 2017-03-22SHANGHAI AEROSPACE POWER TECH
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  • Intelligent high-safety lithium-on battery with polymer skeleton
  • Intelligent high-safety lithium-on battery with polymer skeleton
  • Intelligent high-safety lithium-on battery with polymer skeleton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The positive temperature temperature-sensitive polymer particles in this example are polysulfodimethylammonium isobutylene ester particles with a weight-average molecular weight of 100,000 and a particle size of 0.5 μm. The positive electrode is composed of nickel-cobalt-manganese ternary, polysulfodimethylammonium isobutylene ester particles, polyvinylidene fluoride, and super P in a weight percentage of 92:1:3.5:3.5. The negative electrode is composed of artificial graphite, polysulfodimethylammonium isobutylene ester particles, hydroxymethyl cellulose, styrene-butadiene rubber, and super P according to the weight percentage of 92.5:1:2:3:1.5. The diaphragm is composed of porous polypropylene membrane surface coated with 2um thick polysulfodimethylammonium isobutylene ester particles. The electrolyte is composed of EC (ethylene carbonate): EMC (ethyl methyl carbonate): DEM (diethyl carbonate) according to the ratio of 1:1:1.2, and dissolves 1mol / L lithium hexafluoroph...

Embodiment 2

[0024] The positive temperature-type temperature-sensitive polymer particles in this example are polysulfobetaine particles with a weight-average molecular weight of 100,000 and a particle size of 0.4 μm. The positive electrode is composed of nickel-cobalt-manganese ternary, polysulfobetaine particles, polyvinylidene fluoride, and super P according to the weight percentage of 93:1.5:3:2.5. The negative electrode is composed of graphene, silicon monoxide, polysulfobetaine particles, hydroxymethylcellulose, styrene-butadiene rubber, and super P in a weight percentage of 80:10:2:2:3:3. The separator consists of a porous polyethylene membrane coated with 1.5um thick polysulfobetaine particles. The electrolyte is composed of EC (ethylene carbonate): EMC (ethyl methyl carbonate): DEM (diethyl carbonate) according to the ratio of 1:1.5:1, and dissolves 1.2mol / L lithium hexafluorophosphate. The positive electrode sheet, diaphragm, and negative electrode sheet are stacked in sequence ...

Embodiment 3

[0026] The positive temperature temperature-sensitive polymer particles in this example are poly(N-isopropylacrylamide) particles with a weight average molecular weight of 50,000 and a particle size of 10 μm. The positive electrode is composed of lithium iron phosphate, poly(N-isopropylacrylamide) particles, polyvinylidene fluoride, and superP according to the weight percentage of 93:1.5:3:2.5. The negative electrode is composed of graphene, silicon monoxide, poly(N-isopropylacrylamide) particles, hydroxymethyl cellulose, styrene-butadiene rubber, and super P in a weight percentage of 85:5:2:2:3:3. The diaphragm consists of a porous polyvinylidene fluoride membrane coated with 1 μm thick poly(N-isopropylacrylamide) particles. The electrolyte is composed of EC (ethylene carbonate): EMC (ethyl methyl carbonate): DEM (diethyl carbonate) according to the ratio of 1:1:1, and dissolves 1mol / L lithium hexafluorophosphate. The positive electrode sheet, diaphragm, and negative electro...

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Abstract

The invention discloses an intelligent high-safety lithium-on battery with a polymer skeleton. The intelligent high-safety lithium-on battery comprises a positive electrode, a negative electrode, a membrane and an electrolyte, wherein the positive electrode, the negative electrode and the membrane all contain positive-temperature temperature-sensitive polymer particles; the lithium-on battery can be reversibly converted between a ''liquid lithium-on battery'' and a ''polymer lithium-on battery'' within different temperature ranges; the electrolyte in the ''liquid lithium-on battery'' exists in a form of a liquid electrolyte; and the electrolyte in the ''polymer lithium-on battery'' exists in a form of a polymer electrolyte. The lithium-on battery disclosed by the invention is quickly converted into the ''polymer lithium-on battery'' when the temperature suddenly rises, and does not contain the liquid electrolyte, so that an unstable solid-liquid interface can be removed and the interface stability of the battery can be effectively improved; and by adopting the polymer skeleton, the positive electrode, the negative electrode and the membrane of the battery are tightly connected, and the stability of the battery structure can be improved, so that the lithium-on battery can show good cycling stability and excellent electrochemical properties at different temperatures and is suitable for various complicated environments.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a high-safety lithium-ion battery with an intelligent polymer framework. Background technique [0002] With the rapid development of the new energy vehicle industry, the development of power lithium-ion batteries has also been greatly driven by the market. People's requirements for power lithium-ion batteries are also developing towards high energy density, high power density, high safety performance, long life, and wide environmental adaptability. At present, commercial power lithium-ion batteries generally use graphite as the negative electrode, lithium iron phosphate or lithium cobalt oxide as the positive electrode, polyolefin porous membrane as the diaphragm, and the electrolyte exists in liquid form. With the introduction of high-energy-density electrode materials, such as silicon-based negative electrodes, tin-based negative electrodes, graphene negative elect...

Claims

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Application Information

Patent Timeline
22 Mar 2017
Publication
CN106531971A
IPC
H01M4/137; H01M10/0564; H01M10/0525
CPC
H01M4/137; H01M10/0525; H01M10/0564; Y02E60/10
Inventors
白雪君; 刘婵