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Lithium-ion battery electrolyte, lithium-ion battery and electronic instrument

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of insufficiency and low energy density, and achieve the effect of improving service life, large capacity retention rate, and stable performance.

Active Publication Date: 2016-10-26
LENOVO (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, high-voltage and high-energy-density polymer lithium-ion batteries for smartphones can only meet 500 cycles, and the capacity retention rate is greater than 80%.
And the energy density is much lower than 680Wh / L
Unable to meet the increasing demand for smart phones with higher energy density and long cycle life

Method used

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  • Lithium-ion battery electrolyte, lithium-ion battery and electronic instrument
  • Lithium-ion battery electrolyte, lithium-ion battery and electronic instrument
  • Lithium-ion battery electrolyte, lithium-ion battery and electronic instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Preparation of polymer lithium-ion batteries:

[0121] The negative electrode is made of artificial graphite with a compacted density of 1.70g / cm 3 ;

[0122] The electrolyte solvent is: 30% EC (ethylene carbonate), 30% DEC (diethyl carbonate), 20% PP (propyl propionate) and 20% PC (propylene carbonate) mixed solvent;

[0123] Additives are: 0.5% DTD (ethylene sulfate), 5% FEC (fluoroethylene carbonate), 0.5% VC (vinylene carbonate), 2% SN (succinonitrile), 2% ADN (adiponitrile ), 0.5% ethylene glycol (dipropionitrile) ether, 3% PS (1,3-propane sultone) and 4% fluorobenzene mixed;

[0124] Electrolyte lithium salt: 1.10M LiPF 6 ;

[0125] Copper current collector primer material is: a mixed coating of carbon black, binder SBR, and dispersant CMC, with a coating thickness of 0.5 μm;

[0126] The positive electrode material is: Hunan Shanshan Lithium Cobalt Oxide LC9000E.

[0127] The diaphragm is Korean SK, PE 7μm.

[0128] The prepared polymer lithium-ion battery...

Embodiment 2

[0138] Preparation of polymer lithium-ion batteries:

[0139] The negative electrode is made of artificial graphite with a compacted density of 1.85g / cm 3 ;

[0140] The electrolyte solvent is: 30% EC (ethylene carbonate), 20% DEC (diethyl carbonate), 20% PP (propyl propionate) and 30% PC (propylene carbonate) mixed solvent;

[0141] Additives are: 0.1% DTD (ethylene sulfate), 6% FEC (fluoroethylene carbonate), 0.1% VC (vinylene carbonate), 3% SN (succinonitrile), 3% ADN (adiponitrile ), 0.5% ethylene glycol (dipropionitrile) ether, 4% PS (1,3-propane sultone) and 5% fluorobenzene mixed;

[0142] The electrolyte lithium salt is: 1.30M LiPF 6 ;

[0143] Copper current collector primer material is: a mixed coating of carbon black, binder SBR, and dispersant CMC, with a coating thickness of 0.5 μm;

[0144] The positive electrode material is: Hunan Shanshan Lithium Cobalt Oxide LC9000E.

[0145] The diaphragm is Korean SK, PE 7μm.

[0146] The electrical properties of the ...

Embodiment 3

[0151] Preparation of polymer lithium-ion batteries:

[0152] The negative electrode is made of artificial graphite with a compacted density of 1.85g / cm 3 ;

[0153] The electrolyte solvent is: 20% EC (ethylene carbonate), 30% DEC (diethyl carbonate), 30% PP (propyl propionate) and 20% PC (propylene carbonate) mixed solvent;

[0154] The additives are: 1% DTD (ethylene sulfate), 5% FEC (fluoroethylene carbonate), 1% VC (vinylene carbonate), 2% ADN (adiponitrile), 2% ethylene glycol (bis Propionitrile) ether, 3% PS (1,3-propane sultone) and 3% fluorobenzene mixed;

[0155] Electrolyte lithium salt: 1.30MLiPF 6 ;

[0156] Copper current collector primer material is: a mixed coating of carbon black, binder SBR, and dispersant CMC, with a coating thickness of 0.5 μm;

[0157] The positive electrode material is: Hunan Shanshan Lithium Cobalt Oxide LC9000E.

[0158] The diaphragm is Korean SK, PE 7μm.

[0159] The electrical properties of the prepared polymer lithium-ion batt...

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Abstract

The invention provides a lithium-ion battery electrolyte, comprising a solvent and an additive, wherein the solvent comprises propyl propionate and two or three selected from a group consisting of vinyl carbonate, diethyl carbonate and propylene carbonate, and the additive comprises vinyl sulfate, fluoroethylene carbonate, adiponitrile, glycol bis(propionitrile) ether, 1,3-propanesultone and fluorobenzene. A lithium-ion battery prepared from the lithium-ion battery electrolyte has stable usability under the condition of 4.40 V or 4.45 V, has energy density of 750 Wh / L or above, cycle life of 800 times or above and a capacity retention ratio of 80% or above, so the service life of a novel high-voltage high-energy-density polymer lithium-ion battery is substantially improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery electrolyte, a lithium-ion battery and electronic equipment. Background technique [0002] Lithium-ion batteries were first successfully developed by Sony Corporation of Japan in 1990. It is to embed lithium ions in carbon to form a negative electrode (traditional lithium batteries use lithium or lithium alloys as negative electrodes); the positive electrode material uses Li x CoO 2 , or Li x NiO 2 and Li x MnO 4 ; Electrolyte with LiPF 6 , Diethylene carbonate (EC) and dimethyl carbonate (DMC) mixed electrolyte. [0003] Because the negative electrode material is non-toxic and has sufficient resources; at the same time, lithium ions are embedded in carbon, which overcomes the high activity of lithium and solves the safety problems of traditional lithium batteries; and the positive electrode material Li x CoO 2 It can reach a higher level in charg...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 邹啸天黄保宁罗炳财
Owner LENOVO (BEIJING) CO LTD
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