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Nickelic ternary anode material power lithium ion battery electrolyte and preparation method thereof

A technology of lithium ion battery and positive electrode material, which is applied in the field of power lithium ion battery electrolyte and its preparation of high nickel ternary positive electrode material system, and can solve the problem of capacity attenuation, surface activity enhancement, and safety performance deterioration of power lithium ion battery, etc. problems, to achieve the effect of improving cycle stability, improving high temperature performance, and inhibiting battery flatulence

Inactive Publication Date: 2019-03-12
JIANGXI YOULI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: for the high nickel ternary positive electrode material in the prior art, due to the improvement of the nickel content, the structural stability of the material is deteriorated and the surface activity is enhanced, which leads to the rapid decline in the capacity of the power lithium ion battery prepared by it, and the high temperature Defects and deficiencies such as storage and circulation, and deterioration of safety performance

Method used

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  • Nickelic ternary anode material power lithium ion battery electrolyte and preparation method thereof
  • Nickelic ternary anode material power lithium ion battery electrolyte and preparation method thereof
  • Nickelic ternary anode material power lithium ion battery electrolyte and preparation method thereof

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Embodiment 1

[0045] A high-nickel ternary positive electrode material power lithium-ion battery electrolyte, its functional additives include: ① alkyl nitrile additive: trans-3-hexenedicyanide (DCB), ② negative electrode film-forming additive: fluoroethylene carbonate ester (FEC).

[0046] The preparation method of the electrolyte: in the glove box (H 2 O2 6 ), make it reach the concentration of 1M, add functional additive 0.5% DCB, 1% FEC, after stirring and mixing, be packed in the fluorinated bottle, obtain the electrolytic solution of embodiment 1.

Embodiment 2

[0048] A high-nickel ternary positive electrode material power lithium-ion battery electrolyte, its functional additives include: ① alkyl nitrile additive: trans-3-hexenedicyanide (DCB), ② lithium salt additive: LiN(CF 3 SO 2 ) 2 (LiTFSI), ③ negative electrode film-forming additive: fluoroethylene carbonate (FEC).

[0049] The preparation method of the electrolyte: in the glove box (H 2 O2 6 ), make it reach the concentration of 1M, add functional additives 0.5% DCB, 1% LiTFSI, 1% FEC, stir and mix and put in the fluorinated bottle, obtain the electrolyte of embodiment 2.

Embodiment 3

[0051] A high-nickel ternary positive electrode material power lithium-ion battery electrolyte, its functional additives include: ① alkyl nitrile additive: trans-3-hexenedicyanide (DCB), ② lithium salt additive: LiN(CF 3 SO 2 ) 2 (LiTFSI), ③ negative electrode film-forming additive: fluoroethylene carbonate (FEC).

[0052] The preparation method of the electrolyte: in the glove box (H 2 O2 6 ), make it reach the concentration of 1M, add functional additives 1% DCB, 1% LiTFSI, 1% FEC, stir and mix and put in the fluorinated bottle, obtain the electrolyte of embodiment 3.

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Abstract

The invention belongs to the technical field of lithium ion battery preparation, and specifically relates to nickelic ternary anode material power lithium ion battery electrolyte and a preparation method thereof. The electrolyte consists of electrolyte lithium salt, a non-aqueous organic solvent and functional additives, wherein the functional additives comprise an alkyl nitrile additive, fluorinated chain carboxylate, a lithium salt additive and a cathode film forming additive; and the content of the functional additives is 0.5-10% of the weight of the electrolyte. The electrolyte provided bythe invention interacts with transition metal in a nickelic ternary anode material through the functional additives and is decomposed on the surfaces of the anode and cathode to form stable interfacefilms, so as to inhibit the metal ionic catalysis activity and decrease battery side reactions, so that the electrolyte has favorable anti-oxidant and film forming characteristics, is capable of effectively improving the high-temperature storage performance, safety performance and cycle life of nickelic ternary anode material power lithium ion batteries, effectively inhibiting the generation of battery expansion and ensuring the high power characteristic of the batteries at the same time.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to a power lithium-ion battery electrolyte of a high-nickel ternary positive electrode material system and a preparation method thereof. Background technique [0002] As a device that realizes the mutual conversion between electrical energy and chemical energy, after more than two centuries of development, its types and numbers have continued to increase, and its application range covers all fields of modern life, becoming one of the greatest inventions in human history. Compared with traditional lead-acid, Ni-Cd, Ni-MH and other secondary batteries, lithium-ion batteries have high working voltage, high specific energy and specific power, small self-discharge, no memory effect, good cycle stability and green Environmental protection and other advantages have rapidly occupied the main market of mobile electronic equipment power supply since it was ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 齐爱徐斌张建飞章为李抚军张文武
Owner JIANGXI YOULI NEW MATERIALS
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