Lithium ion battery with excellent zero volt storage performance

A lithium-ion battery, storage performance technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as increasing battery costs

Active Publication Date: 2018-10-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This adds a process before battery assembly, which wi

Method used

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  • Lithium ion battery with excellent zero volt storage performance

Examples

Experimental program
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Embodiment 1

[0025] In this embodiment, the lithium-ion battery with excellent zero-volt storage performance includes a casing and a positive electrode, a negative electrode, a diaphragm, and an electrolyte inside the casing, wherein:

[0026] The positive electrode is composed of positive active material: LiCoO 2 , Positive electrode additive: Li 5 FeO 4 , Conductive agent: conductive carbon black, binder: polyvinylidene fluoride (PVDF) and positive electrode current collector: prepared from aluminum foil, LiCoO 2 , Li 5 FeO 4 , the mass ratio of conductive carbon black and PVDF is 72.8:7.2:10:10;

[0027] The negative electrode is prepared from negative electrode active material: mesophase carbon microspheres (MCMB), conductive agent: conductive carbon black, binder: PVDF and negative electrode current collector: copper foil, the mass ratio of MCMB, conductive carbon black and PVDF is 86:7:7;

[0028] The electrolyte consists of electrolyte lithium salts: LiODFB and LiPF 6 mixture...

Embodiment 2

[0040] In this embodiment, the lithium-ion battery with excellent zero-volt storage performance includes a casing and a positive electrode, a negative electrode, a diaphragm, and an electrolyte inside the casing, wherein:

[0041] The positive electrode is composed of positive active material: LiCoO 2 , Positive electrode additive: Li 6 CoO 4 , Conductive agent: conductive carbon black, binder: PVDF and positive electrode current collector: made of aluminum foil, LiCoO 2 , Li 6 CoO 4 , the mass ratio of conductive carbon black and PVDF is 74.4:5.6:10:10;

[0042] The negative electrode is prepared from negative electrode active material: MCMB, conductive agent: conductive carbon black, binder: PVDF and negative electrode current collector: copper foil, and the mass ratio of MCMB, conductive carbon black and PVDF is 86:7:7;

[0043] The electrolyte consists of electrolyte lithium salts: LiODFB and LiBF 4 mixture, electrolyte solvent: a mixture of EC and DMC, electrolyte a...

Embodiment 3

[0054] In this embodiment, the lithium-ion battery with excellent zero-volt storage performance includes a casing and a positive electrode, a negative electrode, a diaphragm, and an electrolyte inside the casing, wherein:

[0055] The positive electrode is composed of positive active material: LiMn 2 o 4 , Positive electrode additive: Li 6 MnO 4 , Conductive agent: conductive carbon black, binder: PVDF and positive current collector: made of aluminum foil, LiMn 2 o 4 , Li 6 MnO 4 , The mass ratio of conductive carbon black and PVDF is 78:2:10:10;

[0056] The negative electrode is prepared from negative electrode active material: MCMB, conductive agent: conductive carbon black, binder: PVDF and negative electrode current collector: copper foil, and the mass ratio of MCMB, conductive carbon black and PVDF is 86:7:7;

[0057] The electrolyte consists of electrolyte lithium salt: a mixture of LiODFB and lithium bisfluorosulfonimide (LiFSI), electrolyte solvent: a mixture o...

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Abstract

The invention discloses a lithium ion battery with excellent zero volt storage performance. The lithium ion battery comprises a shell and a positive pole, a negative pole, a diaphragm and electrolyteinside the shell, wherein the positive pole comprises a positive active material, a positive additive, a conductive agent, an adhesive and a positive current collector; the positive additive is LixMOyor a mixture thereof, wherein x is greater than or equal to 3, y is greater than or equal to 3, and M is any one of Fe, Co, Mo, Ir, Mn, Zn, Pt, Sb, Te, Ti, V, Nb, B, Si, Ge, Sn, Al, Ga and P; the electrolyte comprises an electrolyte lithium salt, an electrolyte solvent and an electrolyte additive; the electrolyte lithium salt is lithium difluoroborate (LiODFB) or a mixed lithium salt of the LiODFB and other lithium salts; and the electrolyte additive is a nitrile compound. The lithium ion battery disclosed by the invention follows a conventional production process for manufacturing, gives consideration to long-time stability of both a negative solid/electrolyte interfacial film and a negative copper current collector at a high level so as to have excellent zero volt storage performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and relates to a lithium ion battery, in particular to a lithium ion battery with excellent zero-volt storage performance. Background technique [0002] During normal use of the battery, the lithium-ion battery voltage will decrease as the discharge progresses. When the rated discharge cut-off voltage is reached, the battery stops discharging, and if it continues to discharge, it is over-discharged. When the battery is over-discharged to a certain voltage, the protection circuit will disconnect the battery from the load to prevent further reduction of the battery voltage. But as time goes on, even if the battery is disconnected from the load, the battery voltage will still drop slowly due to self-discharge, or even drop to zero volts, and the battery will enter a zero-volt state with no power. This zero-volt state will reduce the battery capacity, deteriorate the cycle stability, a...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0567H01M10/42H01M10/058H01M10/0525
CPCH01M4/62H01M10/0525H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 方海涛刘春雨姚萌
Owner HARBIN INST OF TECH
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