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Preparation method of functional additive-containing lithium ion battery

A technology of lithium-ion batteries and additives, applied in battery electrodes, secondary batteries, circuits, etc.

Inactive Publication Date: 2015-07-29
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102044675A describes that adding imide compounds to the homogenate of the positive electrode can improve the high temperature performance, overcharge resistance and safety performance of the battery, but does not involve the formation of the SEI film
The document "Review of selected electrode-solution interactions which determine the performance of Li and Li ion batteries" (D. Aurbach, J. Power Sources, 89, 206, 2000) proposes that there is still a shortcoming in adding additives to electrodes, that is, with the As the battery is charged and discharged, lithium ions continuously penetrate and pass through the SEI film on the surface of the electrode. The SEI film is damaged and needs to be repaired. The additives in the electrode lack fluidity and cannot complete the repair process, which leads to the cycle performance of the battery. Decreased safety performance, reduced effect of additives

Method used

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  • Preparation method of functional additive-containing lithium ion battery
  • Preparation method of functional additive-containing lithium ion battery
  • Preparation method of functional additive-containing lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Negative electrode preparation: will be 0.1% lithium carbonate (Li 2 CO 3 ) Add additives to cellulose sodium (CMC) aqueous solution (hereinafter referred to as negative electrode glue), stir evenly, then add conductive agent, active material graphite, and binder in a certain proportion, stir evenly to form a slurry, and then coat to obtain negative electrode .

[0027] Positive electrode preparation: Conductive agent, positive electrode active material nickel cobalt lithium manganese oxide Li (Ni 0.5 co 0.2 mn 0.3 )O 2 Adding in a certain proportion to an N-methylpyrrolidone (NMP) solution containing a binder, uniformly stirring to obtain a positive electrode slurry, and then coating to obtain a positive electrode.

[0028] Electrolyte preparation: The electrolyte is dissolved lithium hexafluorophosphate (LiPF 6 ) of ethylene carbonate-ethyl methyl carbonate (EC-EMC) mixed solution, in which adding 0.2% Li with respect to the electrolyte mass ratio 2 CO 3 addit...

Embodiment 2

[0031]The steps of embodiment 2 are basically the same as in embodiment 1, except that the Li 2 CO 3 The mass ratio of additives relative to the active substance is 0.15%.

Embodiment 3

[0033] The steps of Example 3 are basically the same as in Example 1, except that the Li in the negative electrode glue is added 2 CO 3 The mass ratio of additives relative to the active substance is 0.2%.

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Abstract

The invention relates to a lithium ion battery and especially relates to a functional additive-containing lithium ion battery and a preparation method thereof. The functional additive-containing lithium ion battery comprises an additive-containing electrode and an additive-containing electrolyte. The preparation method of the functional additive-containing lithium ion battery comprises adding one or more additives into an electrolyte in cell electrode homogenization, wherein a mass ratio of each one of the additive to active substances of the electrode is in a range of 0.05-0.5% and a mass ratio of each one of the additive to the electrolyte is in a range of 0.1-2.5%. The preparation method can improve lithium battery performances comprising cell safety performances such as normal temperature and high / low temperature cycle performances, high temperature resistance and overcharge resistance.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to an additive-containing lithium ion battery and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have attracted great attention due to their excellent characteristics such as high energy density, high output voltage, low self-discharge rate, long service life, no memory effect, and environmental friendliness. Expand and gradually replace nickel-cadmium (Ni-Cd) and metal nickel-hydride (Ni-MH) batteries, occupying a dominant position. It is widely used in mobile electronic terminal equipment such as notebook computers, mobile phones, cameras, instruments and meters, and electric tools. In addition, the demand for lithium-ion batteries in high-tech industries such as electric vehicles (EV), energy storage, and military industry is also expanding. It has not only developed into a mainstream industry in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/62
CPCH01M4/62H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 刘学文殷月辉吕豪杰高新宝陈军
Owner WANXIANG 123 CO LTD
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