Negative active material composition, method of preparing negative electrode plate and lithium secondary battery by using the same
The technology of a negative electrode active material and composition, which is applied in the field of negative electrode active material composition, can solve the problems of cycle life reduction, capacity reduction, loss of electrical contact, etc., and achieve the effect of preventing internal stress and good life characteristics
Inactive Publication Date: 2012-07-18
SAMSUNG SDI CO LTD
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AI Technical Summary
Problems solved by technology
Due to this large volume change, if charge and discharge continue, the negative active material is separated from the current collector, or electrical contact is lost due to the pulverization of negative active material particles
Moreover, since this negative electrode active material has a reversible discharge capacity of about 50% of the initial capacity, if charge and discharge continue, the capacity decreases rapidly and the cycle life decreases
Method used
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Experimental program
Comparison scheme
Effect test
preparation example 1
[0097] 5 g of polyacrylic acid (PAA) was added to 40 g of water and 10 g of propanol, and completely dissolved by stirring to prepare a binder solution. 45g SiO x (0<x<1) The active material is added into the binder solution to prepare a negative electrode active material slurry composition.
preparation example 2
[0099] The negative electrode active material slurry composition was prepared according to Preparation Example 1, except that 30 g of water and 20 g of propanol were used.
preparation example 3
[0101] The negative electrode active material slurry composition was prepared according to Preparation Example 1, except that 45 g of water and 5 g of propanol were used.
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Abstract
Negative active material composition, method of preparing negative electrode plate and lithium secondary battery by using the same. The negative active material composition including a negative active material, a binder, and a solvent, in which the solvent includes an aqueous solvent and an organic solvent, and a method of preparing a negative electrode plate by using the negative active material composition. A lithium battery manufactured by using the negative active material composition has good lifetime characteristics due to formation of pores in an electrode plate.
Description
technical field [0001] The invention relates to a negative electrode active material composition, a method for preparing a negative electrode plate using the negative electrode active material composition, and a lithium secondary battery manufactured using the negative electrode active material composition. Background technique [0002] The recent development and increasing demands of mobile devices have resulted in high demand for secondary batteries as an energy source. Among secondary batteries, lithium secondary batteries having high energy density and high voltage are commercially available and widely used. [0003] Generally, a lithium secondary battery includes a lithium transition metal oxide as a positive electrode active material and a lithium metal, a carbonaceous material, a silicon-based material or a tin-based material as a negative electrode active material. [0004] Carbonaceous materials were first introduced by Japan's Sony Energy Tec Inc. in the early 199...
Claims
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IPC IPC(8): H01M4/62H01M4/139H01M10/0525
CPCY02E60/122H01M4/622H01M4/13H01M10/052H01M4/139H01M2004/021H01M4/0404H01M4/043Y10T29/49115Y10T29/49108Y02E60/10H01M4/1395H01M4/1397H01M10/0525Y02P70/50
Inventor 孙东湖金基俊金寅金荣洙朴杉秦徐奈利金明宣
Owner SAMSUNG SDI CO LTD