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公开(公告)号：US20240339616A1
公开(公告)日：2024-10-10
申请号：US18619209
申请日：2024-03-28
发明人： Lei Li , Haiyang Kang , Yi Zheng , Meihuang Chen , Chengdong Sun
CPC分类号： H01M4/622 , H01M2004/021
摘要： The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method thereof, a separator comprising the binder, a battery cell, a battery and an electrical apparatus. The binder for secondary batteries includes an organic polymer. The organic polymer has a first glass transition temperature and a second glass transition temperature, the first glass transition temperature is less than or equal to 25° C., and the second glass transition temperature is greater than 25° C. During coating of a separator, the binder is non-viscous at room temperature to facilitate winding and unwinding of the separator. However, the binder has a better bonding force when a cold pressing process is carried out after the winding with positive and negative electrode plates, so that the positive and negative electrode plates and the separator fit each other closely.
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2.发明公开公开(公告)号：US20240222795A1
公开(公告)日：2024-07-04
申请号：US18592536
申请日：2024-03-01
发明人： Haiyi Hong , Lei Li , Xiaonan Cheng , Jianrui Yang , Peng Wang , Yi Zheng , Chengdong Sun
IPC分类号： H01M50/451 , H01M50/42 , H01M50/426 , H01M50/46
CPC分类号： H01M50/451 , H01M50/42 , H01M50/426 , H01M50/46
摘要： This application relates to the field of battery technologies, and in particular, to a binder and a preparation method thereof, and a separator, electrode assembly, battery cell, battery, and electric apparatus containing such binder. The binder includes a core layer structure and a shell layer structure provided on surface of the core layer structure, where the core layer structure includes a polyvinylidene fluoride polymer, and the shell layer structure includes a polyacrylate polymer. Polyvinylidene fluoride is a homopolymer with a crystallinity of about 50%, resulting in insufficient adhesion force. Therefore, in this application, the polyacrylate polymer is used to encapsulate the polyvinylidene fluoride polymer to obtain a core-shell-structured binder, so that the crystallinity of the polyvinylidene fluoride polymer in the core-shell-structured binder is improved, and adhesion performance of the core-shell-structured binder is improved, thereby increasing adhesion force between a separator and an electrode plate via the binder.
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公开(公告)号：US20240360259A1
公开(公告)日：2024-10-31
申请号：US18765315
申请日：2024-07-07
发明人： Lei Li , Haiyang Kang , Chengdong Sun , Yi Zheng , Shaohua Ai
IPC分类号： C08F220/18 , C08K7/26 , C08K9/08 , H01M50/42 , H01M50/437 , H01M50/446 , H01M50/451
CPC分类号： C08F220/18 , C08K7/26 , C08K9/08 , H01M50/42 , H01M50/437 , H01M50/446 , H01M50/451 , C08K2201/005
摘要： A binder composition includes a polymer and ceramic particles, the polymer including structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, and a molar ratio of the first-type monomer, second-type monomer, and third-type monomer being (50 to 58):(40 to 44):(2 to 6); where the first-type monomer is selected from one or more compounds of formula I, the second-type monomer is selected from one or more compounds of formula II, and the third-type monomer is selected from one or more compounds of formula III. The binder improves the porosity of the separator, increases the ionic conductivity, and reduces the internal resistance, thereby enhancing the cycling performance of the secondary battery.
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公开(公告)号：US20240356155A1
公开(公告)日：2024-10-24
申请号：US18592528
申请日：2024-03-01
发明人： Lei Li , Meihuang Chen , Yi Zheng , Haiyang Kang , Runhao Lai , Chengdong Sun
IPC分类号： H01M50/42 , H01M50/449
CPC分类号： H01M50/42 , H01M50/449
摘要： The present application relates to the technical field of secondary batteries, and more particularly relates to a binder for secondary batteries, a separator, a secondary battery and an electrical apparatus. The binder for secondary batteries is in a ring shape, and includes an acrylate copolymer. The acrylate copolymer has good adhesion, and a contact point of the binder with the ring-shaped structure is a circle line of the ring-shaped binder. The ring-shaped binder has bonding points with larger areas than a spherical binder, such that good bonding performance can be achieved when the usage amount of the binder with the ring-shaped structure is reduced.
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公开(公告)号：US20240347857A1
公开(公告)日：2024-10-17
申请号：US18592560
申请日：2024-03-01
发明人： Lei Li , Chengdong Sun , Yi Zheng , Haiyang Kang , Meihuang Chen
IPC分类号： H01M50/42
CPC分类号： H01M50/42
摘要： The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method thereof, as well as a separator, battery cell, battery and electrical apparatus comprising the binder. The binder for secondary batteries includes a first polymer and a second polymer, the first polymer includes an acrylate copolymer, and the second polymer includes a water-soluble polymer. When the separator is coated, the binder is stirred evenly in water, coated on the separator, and oven dried to form a bonding layer on the separator. The bonding layer includes a side facing the separator and a side away from the separator. The bonding layer is bonded on the separator, and the side away from the separator has no adhesiveness, which facilitates the winding and unwinding of the separator.
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公开(公告)号：US20240304819A1
公开(公告)日：2024-09-12
申请号：US18664259
申请日：2024-05-14
发明人： Xiaonan Cheng , Haiyi Hong , Lei Li , Jianrui Yang , Peng Wang , Yi Zheng , Chengdong Sun
CPC分类号： H01M4/622 , H01M50/42 , H01M2004/021
摘要： This application discloses a binder and a preparation method thereof, a separator, an electrode plate, an electrode assembly, a battery cell, a battery, and an electric apparatus, and relates to the field of battery technologies. The binder includes a coating layer and a core disposed in the coating layer, where the coating layer includes a polyacrylate copolymer, and the core includes ceramic. The binder is applied onto the separator and used in the battery, providing strong adhesion. This enhances the pre-cold pressing adhesion force and hardness of the battery cell, and reduces electrochemical impedance, thus improving the cycling performance of the battery.
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7.发明公开公开(公告)号：US20240356156A1
公开(公告)日：2024-10-24
申请号：US18592548
申请日：2024-03-01
发明人： Lei Li , Haiyang Kang , Yi Zheng , Meihuang Chen , Runhao Lai , Peng Wang , Chengdong Sun
IPC分类号： H01M50/42 , C08J3/12 , C08L23/12 , C08L33/06 , H01M50/417 , H01M50/449
CPC分类号： H01M50/42 , C08J3/126 , C08L23/12 , C08L33/066 , H01M50/417 , H01M50/449 , C08J2323/12 , C08J2333/08 , C08L2203/20 , C08L2207/53
摘要： The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method, a secondary battery, and an electrical apparatus thereof. The binder includes a core structure and a shell structure disposed on a surface of the core structure. The shell structure includes an acrylate copolymer, and the core structure comprises a rigid polymer. The rigid polymer has a crystallinity ranging from 32% to 94%. The binder with a core-shell structure includes the core structure of the rigid polymer. During cold pressing of a battery cell, the rigid polymer acts as a support, making a particle structure of the binder stable, that is, the rigid polymer acts as a support, resulting in an overall increase in the rigidity of the binder.
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