An electrode adhesive for a lithium ion battery, and preparing and using methods thereof

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery capacity attenuation, affecting the charging and discharging performance of lithium-ion batteries, low conductivity, etc., to reduce polarization, The effect of avoiding the deterioration of adhesion performance and good conductivity

Inactive Publication Date: 2016-03-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although the binder can provide a binding effect for the electrode material, on the other hand, the lithium ion conductivity of the binder in the electrode material affects the charge and discharge performance of the lithium ion battery. The lithium ion conductivity of the binder is generally very low, and it is easy to cause the battery capacity to decay rapidly under high rate charge and discharge.

Method used

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  • An electrode adhesive for a lithium ion battery, and preparing and using methods thereof
  • An electrode adhesive for a lithium ion battery, and preparing and using methods thereof
  • An electrode adhesive for a lithium ion battery, and preparing and using methods thereof

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Embodiment 1

[0036] In this embodiment, the electrode binder of the lithium-ion battery is an ionic polymer, which is a polysulfone main chain as the main chain, and the side chain is grafted with fluorine-containing sulfonimide lithium salt, and its molecular formula is -[(Ar )-CF 2 CF 2 OCF 2 CF 2 SO 2N(Li)SO 2 C 7 h 7 ] n .

[0037] The method for preparing the electrode binder of above-mentioned lithium ion battery comprises the steps:

[0038] Step 1: Synthesis of ICF 2 CF 2 OCF 2 CF 2 SO 2 N(K)SO 2 C 7 h 7

[0039] Add 24.4mMol dry KF and 5.14mMolCH to the 50ml flask 3 C 6 h 4 SO 2 NHNa, evacuate to 2mHg at 100°C, then add 2.54 g of ICF 2 CF 2 OCF 2 CF 2 SO 3 F and 10ml of dry acetonitrile, under the protection of nitrogen, keep the temperature at 60-80°C, stir the reaction for two days, then distill off the solvent under reduced pressure, and dry in vacuo to obtain 6.12 grams of solid product ICF 2 CF 2 OCF 2 CF 2 SO 2 N(K)SO 2 C 7 h 7 .

[0040] S...

Embodiment 2

[0050] In this embodiment, the electrode binder of the lithium ion battery is an ionic polymer, which is based on the main chain of polyether ether ketone, and the side chain is grafted with fluorine-containing sulfonimide lithium salt, and its molecular formula is -[( Ar)-CF 2 CF 2 OCF 2 CF 2 SO 2 N(Li)SO 2 C 7 h 7 ] n .

[0051] The method for preparing the electrode binder of above-mentioned lithium ion battery comprises the steps:

[0052] Step 1: Synthesis of ICF 2 CF 2 OCF 2 CF 2 SO 2 N(K)SO 2 C 7 h 7

[0053] Add 24.4mMol dry KF and 5.14mMolCH to the 50ml flask 3 C 6 h 4 SO 2 NHNa, evacuate to 2mHg at 100°C, then add 2.54 g of ICF 2 CF 2 OCF 2 CF 2 SO 3 F and 10ml of dry acetonitrile, under the protection of nitrogen, keep the temperature at 60-80°C, stir the reaction for two days, then distill off the solvent under reduced pressure, and dry in vacuo to obtain 6.12 grams of solid product ICF 2 CF 2 OCF 2 CF 2 SO 2 N(K)SO 2 C 7 h 7 .

...

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Abstract

The invention provides an electrode adhesive for a lithium ion battery. The adhesive is a lithium ion polymer adopting an aromatic benzene ring as a main chain and adopting fluorine-containing lithium sulfimide as a side chain. Compared with the prior art, the adhesive can form co-complexation bridging with high-energy-density active compounds such as nanometer silicon, is good in adhesiveness, and can adapt to stress influences generated by volume changes of active compounds in charge and discharge processes. The adhesive is good in lithium ionic conductivity, thus overcoming problems that charge-discharge properties of lithium ion batteries are influenced and battery capacity rapidly decreases during high-rate charging and discharging in particular, which are caused by low lithium ionic conductivity of adhesives at present. The adhesive has a good application prospect in all-solid-state polymer lithium ion batteries, gel state polymer lithium ion batteries, integrated polymer lithium ion batteries, and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode binder for lithium ion batteries, a preparation method and a use method thereof. Background technique [0002] The energy density of lithium-ion batteries exceeds 150Wh / Kg, which is almost the highest energy density among known secondary batteries. It is precisely because of the high energy density that lithium-ion batteries have played an increasingly important role in new energy sources. In order to further improve the performance of lithium-ion batteries, researchers have started work on the development of new materials and the optimization of preparation processes. [0003] The binder is a very important part of the positive and negative electrode materials of lithium batteries. It is used to tightly bond the active materials, conductive agents and current collectors in the electrode materials to strengthen the relationship between the active mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCY02E60/10
Inventor 薛立新秦德君聂锋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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