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Secondary battery

A technology for secondary batteries and current collectors, used in secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve problems such as secondary battery performance degradation, and achieve the effect of improving cycle characteristics

Pending Publication Date: 2022-04-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when silicon-based anode active materials are mixed with carbonaceous graphite active materials, the energy density can be increased, but the performance of secondary batteries will be degraded undesirably.

Method used

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  • Secondary battery

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Embodiment 1

[0117] First, a mixed negative electrode active material containing artificial graphite as a carbonaceous active material and Si as a Si-based active material, a binder polymer (styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC)), and Carbon black as a conductive material was mixed in a weight ratio of 95:3.5:1.5, and the resulting mixture was mixed with water as a dispersion medium in a weight ratio of 1:2 to prepare a slurry for an active material layer. Here, the weight of Si is 2% by weight based on the total weight of the mixed negative electrode active material including artificial graphite and Si, and the weight ratio of styrene-butadiene rubber (SBR) to carboxymethyl cellulose (CMC) is 2.3:1.2.

[0118] The slurry for the active material layer was coated on one surface of a copper (Cu) film with a thickness of 10 μm as a negative electrode current collector by using a slot die, and vacuum-dried at 130° C. for 1 hour to form on the copper film. active mate...

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Abstract

Disclosed are a secondary battery and a method for operating the same, the secondary battery including a positive electrode, a negative electrode, and a separator interposed between the negative electrode and the positive electrode, in which the negative electrode includes: a negative electrode current collector; and a negative electrode active material layer formed on at least one surface of the negative electrode current collector, and including a carbonaceous active material and a Si-based active material, and operating the secondary battery by setting a lower limit of state of charge (SOC) during operation of the secondary battery according to a weight mixing ratio of the Si-based active material and the carbonaceous active material and a capacity ratio of the Si-based active material and the carbonaceous active material.

Description

technical field [0001] The present disclosure relates to a secondary battery, and in particular, to a secondary battery having improved energy density. [0002] This application claims priority from Korean Patent Application No. 10-2019-0144585 filed in Korea on November 12, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, the markets for electric vehicles, robots, and power storage devices are rapidly developing, and thus secondary batteries with high energy density, high stability, compactness, light weight, and long service life are required. Whether the secondary battery can be applied to such a large-scale industrial field depends on the guarantee of the performance of the secondary battery, including a higher energy density per unit weight or per unit volume than that according to the prior art. [0004] Graphite is a commercially available negative electrode active material for lithium-ion batteries with a lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/587H01M4/386H01M4/364H01M10/0525Y02E60/10H01M10/448H01M4/133H01M4/134H01M10/052H01M10/44
Inventor 金镒弘
Owner LG ENERGY SOLUTION LTD