Suspending agent for negative electrode of lithium ion battery, negative electrode of lithium ion battery and lithium ion battery
A lithium-ion battery and suspending agent technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of not having lithium ion transmission capacity, low battery rate performance, and failure to meet requirements, etc., and achieve good Good dynamic performance, good rate performance, and low DCR value
Active Publication Date: 2021-02-19
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology
[0003] When the traditional cellulose suspension is used to prepare the negative electrode of the battery, because it does not have the ability to transport lithium ions, the rate performance of the battery is low, the cycle life is short, and the DCR value is high, which cannot meet the demand.
Method used
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Embodiment 1
[0031] 1) The synthesis of suspending agent adopts the following reaction conditions and steps to synthesize:
[0032]
[0033] Among them, R 1 for -CH 2 CH 2 -, R 2 is -COOH, X is Na + ,
[0034] The structural formula is The number average molecular weight is 300,000 to 400,000.
[0035] Preparation of battery
[0036] 1) Preparation of positive electrode sheet
[0037] The cathode active material LiNiCoMnO 2 , the binder PVDF, the conductive agent SP, and the solvent N-methylpyrrolidone (NMP) were stirred at a high speed for 3 hours to obtain a uniformly dispersed slurry. In the slurry, the solid content is 60wt%, and the solid content contains 90wt% lithium nickel cobalt manganate (LiNiCoMnO 2 ), 5.0wt% polyvinylidene fluoride and 5wt% conductive carbon black. Then the slurry is evenly coated on both sides of the aluminum foil, dried and compacted by a roller press to obtain a positive electrode sheet.
[0038] 2) Preparation of negative electrode sheet
[0...
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The invention discloses a suspension agent for lithium ion battery negative electrode, which comprises one of the compound shown in the general formula (I), the compound shown in the general formula 1c, and the compound shown in the general formula 1e: wherein, R 1 for-CH 2 ‑, R 2 from-CH 2 CN, -CH 2 CH 2 CN, -OCN, -CH 2 NH 2 ,-OH,-CH 2 OH,-C(CH 3 ) 2 OH,-SO 3 H,-CH 2 SO 3 One of H; or R 1 is an alkyl group with 2 to 5 carbon atoms or an alkenyl group with 2 to 5 carbon atoms, R 2 for ‑CN, ‑COOH, ‑NH 2 , ‑OCN, ‑OH, ‑CONHCH 3 ,-CON(CH 3 ) 2 ,-SO 3 H group; X is Li + 、Na + 、K + , NH4 + One of m>0, n>0, and m+n=100%. Compared with the prior art, the suspending agent of the present invention is obtained by combining polycyclic α-cellulose with acrylonitrile / propionate / methyl propionate / butyrate / vinyl acetate / propylene acetate / propionate Copolymerization of polar monomers such as sulfonic acids, because the molecular chain contains a large number of polar groups, the surface of the active material is easy to accumulate more Li + , in favor of Li + Fast conduction in the suspension agent, the final lithium-ion battery has good rate performance.
Description
technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a suspension agent for lithium-ion battery negative poles, lithium-ion battery negative poles and lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most widely used and researched secondary batteries in the world today because of their advantages such as high energy density, good cycle performance, low self-discharge rate, environmental protection and no pollution. At present, lithium-ion batteries have been successfully used in portable electronic devices such as mobile phones and notebooks, and are gradually developing into many fields such as aerospace, electric vehicles, and energy storage systems. New applications put forward higher requirements on the specific capacity, rate characteristics, and cycle life of lithium-ion batteries. The performance of lithium-ion batteries depends largely on ...
Claims
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IPC IPC(8): H01M10/42H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 刘会会李吉蓉郭超
Owner CONTEMPORARY AMPEREX TECH CO