Lithium ion battery electrolyte and lithium ion battery comprising same

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of difficult application of high-nickel ternary power materials, reducing battery life, and damaging the passive film of active materials, etc. Achieve the effect of improving high-temperature storage performance and cycle performance, improving high-temperature performance, and inhibiting battery gas production

Inactive Publication Date: 2018-09-28
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many problems in high-nickel cathode materials: on the one hand, with the increase of nickel content in cathode materials, there is a phenomenon of ion mixing in high-nickel crystals during charge and discharge, and transition metal ions will detach as the reaction progresses. Crystals enter the electrolyte to catalyze the decomposition of the electrolyte and damage the passivation film of the active material, thus affecting the service life; The damage to the battery system by metal ions and active hydrogen substances in the battery system can easily cause problems such as battery inflation and thermal runaway; moreover, high-nickel materials have extremely high requirements on the environment and process, and it is difficult to remove a small amount of water in the battery system , reducing the service life of the battery, the above reasons have brought difficulties to the application of high-nickel ternary power materials

Method used

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  • Lithium ion battery electrolyte and lithium ion battery comprising same
  • Lithium ion battery electrolyte and lithium ion battery comprising same
  • Lithium ion battery electrolyte and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Electrolyte preparation:

[0032] In a glove box filled with argon (moisture content 3 , and then slowly add a lithium salt with a mass fraction of 12.5%, and stir until it is completely dissolved to obtain the lithium ion battery electrolyte of Example 1.

[0033] Preparation of lithium-ion batteries:

[0034] The positive electrode active material LiNi 0.6 co 0.2 mn 0.2 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride are fully stirred and mixed in the N-methylpyrrolidone system according to the mass ratio of 95:3:2, and then coated on the aluminum foil, dried, and cold-pressed to obtain the positive electrode sheet .

[0035] After the negative electrode active material LA1, the conductive agent acetylene black, the binder styrene-butadiene rubber, and the thickener carboxymethyl cellulose sodium are fully stirred and mixed in the deionized water solvent system according to the mass ratio of 96:2:1:1, Coating on copper foil, dr...

Embodiment 2～40

[0038] Embodiment 2~40 and comparative example 1~4

[0039] Electrolyte preparation:

[0040] The preparation method of the electrolyte of Examples 2-40 and Comparative Examples 1-4 is similar to that of Example 1, that is, in a glove box (moisture content1 ~ M 5 The bridged anhydride additives correspond to the following compounds respectively:

[0041]

[0042] Preparation of lithium-ion batteries:

[0043] The preparation method of the lithium-ion battery of Examples 2-40 and Comparative Examples 1-4 is similar to the preparation method of the lithium-ion battery of Example 1. The positive active material and negative active material listed in Table 2 are used, and then injected into the lithium-ion battery of Example 2 respectively. ~40 and the electrolytic solution corresponding to Comparative Examples 1~4, and through processes such as encapsulation, shelving, chemical formation, aging, secondary encapsulation, and volume separation, the high-nickel ternary components...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a lithium ion battery electrolyte and a lithium ion battery comprising the same. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a bridge ring anhydride additive and a low-impedance additive, and the bridge ring anhydride additive is at least one of compounds shown in a formula I, a formula II, a formula III and a formula IV. Compared with the prior art, the electrolyte has the advantages that the bridge ring anhydride additive participates in formation of a negative electrode SEI film, a protection film is also formed at a positive electrode, gas generation of the battery is prevented, the high-temperature storage performance and the cycle property of the battery are improved, and the demand of a power battery and a high-energy density battery can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] At present, lithium-ion batteries are widely used in digital products, electric vehicles and other fields, and people have put forward higher requirements for the energy density of lithium-ion batteries. The high-nickel ternary power battery system is an important direction for the development of lithium-ion batteries today. The use of high-nickel ternary cathode materials to increase the energy density of power batteries and extend the cruising range is a commonly used method at present. [0003] However, there are still many problems in high-nickel cathode materials: on the one hand, with the increase of nickel content in cathode materials, there is a phenomenon of ion mixing in high-nickel crystals during charge and discharge, and tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 朱学全潘立宁杨春容
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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