Lithium ion battery safe coating and preparation method thereof

A lithium-ion battery, safe technology, applied in the direction of coating, electrode manufacturing, battery pack components, etc., can solve problems such as fire, battery heat out of control explosion, unable to solve large-area internal short circuit of the battery, etc., to reduce current and application costs Effect of low and internal resistance polarization increase

Inactive Publication Date: 2013-04-24
TIANJIN ENERGIES
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Problems solved by technology

[0003] The existing technology can effectively reduce the internal short circuit of the battery, but it cannot solve the problem of

Method used

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  • Lithium ion battery safe coating and preparation method thereof

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Embodiment 1

[0028] The positive electrode used in the present invention includes positive electrode active material lithium nickel cobalt manganate 94% (weight ratio), conductive agent 2% (weight ratio), binder 4% (weight ratio); negative electrode includes negative electrode active material artificial graphite 96% ( weight ratio), conductive agent 2% (weight ratio), binder 2% (weight ratio); the separator uses three layers of PP / PE / PP separator with a thickness of 20μm.

[0029] The battery capacity is 5.2Ah, and the electrolyte lithium salt is LiPF 6 , concentration 1mol / L, electrolyte solvent is ethylene carbonate (EC): diethyl carbonate (DEC): ethyl methyl carbonate (EMC) = 1:1:1.

[0030] Mix aluminum oxide oxyhydroxide (AlOOH) 34.98% (weight ratio), NMP 65% (weight ratio), PVDF 0.02% (weight ratio), use a high-speed disperser or ball mill to mix evenly, and the viscosity is in the range of 100mPa.s-1500mPa.s Inside; use roller coating, gravure printing or spraying to coat the posit...

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Abstract

The invention discloses a lithium ion battery safe coating which is made of one or more of alkali hydroxide, alkali carbonate and alkali bicarbonate; and the chemical general formula of the lithium ion battery safe coating is shown as MX(OH)y, MX(CO3)y and MX(HCO3)y, wherein M refers to alkali metal. The lithium ion battery safe coating has the functions of thermal decomposition by heating and heat absorption, crystal structure change or pulverization, or release of water and carbon dioxide, can reduce the battery temperature and stop the charging/discharging under the condition that the battery is overheated, reduces the short circuit or current under the overcharge state, improves the safety of the battery, and has important practical significance.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery safety coating and a preparation method thereof. Background technique [0002] With the wide application of lithium-ion batteries in consumer electronics, electric bicycles, electric vehicles, and energy storage, the safety of lithium-ion batteries has received more and more attention. In order to improve the safety of lithium-ion batteries, the most researched is the safety coating, that is, coating a layer of insulator on the positive electrode, negative electrode or separator surface of the battery, such as zirconia, aluminum oxide, silicon oxide, titanium oxide, nitride Silicon, boron nitride, aluminum nitride, among which aluminum oxide is the most widely used. [0003] The existing technology can effectively reduce the internal short circuit of the battery, but it cannot solve the problem of large-scale internal short circuit of the battery, overcharging, and ...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12C09D5/25H01M2/16H01M4/04
CPCY02E60/10
Inventor 王涌高秀玲刘静
Owner TIANJIN ENERGIES
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