How would like to contact us?

Coin Cell Preparation

he development of new positive electrode materials is on route to increase the energy density of lithium-ion batteries (LIBs) for electric vehicle and grid storage applications. The performance of new materials is typically evaluated using handmade half coin cells with the new material as the positive electrode and a piece of lithium foil for the negative. Whereas half coin cells are easy to make and can give reproducible data, they can fail to accurately predict how a material would perform in a full cell. The present work develops methods to prepare full coin cells, using graphite as the negative electrode material. Detailed instructions are provided to enable researchers to prepare their own high quality full coin cells with good reproducibility between cells. The precision of the handmade full coin cells is compared with and found to approach the quality of machine-made, commercially produced full cells. Lithium-ion batteries (LIBs) are widely used in a large variety of consumer products. With the rise in use in electric vehicles and grid storage applications, increasing the energy density of LIBs is a key goal for energy storage researchers. One key approach is to develop new positive electrode materials that have higher specific capacities and/or are stable at higher voltages. 1,2 To investigate how these new materials perform they need to be made into LIBs for prolonged testing. Machine-made, commercially produced pouch cells provide very reproducible data, making them ideal for comparative electrolyte development and performance evaluations with fixed positive and negative electrode materials. 3-6 A batch of 26 replicate commercially made pouch cells that were filled, formed, degassed, and then cycled 12 times were shown to have a very narrow range of discharge capacities (r.s.d. = 0.5%) and the precision of intrinsic metrics such as coulombic efficiency was even greater. 7 However, machine-made cells are produced in large batches which requires significant resources. It is therefore impractical to order an entire run of commercial cells to test every new possible electrode material. Rather, new materials are usually evaluated by constructing coin cells made with handmade electrodes. Most research labs use lithium metal cells (referred to as “lithium half cells”), with the new material as the positive electrode and a piece of lithium foil as the negative. Half coin cells are relatively easy to make and can provide very repeatable data. Yet they can fail to accurately predict how a material would perform in an actual lithium-ion cell (referred to as a “full cell”). This is primarily because half cells have an abundance of lithium, which can mask problems with side reactions that use up available lithium. Thus, a half cell made with a certain positive electrode material might provide favorable results when in actuality a full cell made with the same material might perform poorly. Additionally, it is impossible to determine the effect of interactions between positive and negative electrodes that would result in a full Li-ion cell from data on half cells. 8-10 In order to accurately predict the performance of new electrode materials in Li-ion batteries a method to make accurate and repeatable full coin cells would be valuable. However, the use of coin cell full Li-ion cells is sparsely discussed in the literature and reliable methods to make precise cells have not been established. The present work develops methods to prepare full coin cells, using graphite as the negative electrode material. Detailed instructions are provided to enable researchers to prepare their own high quality full coin cells with good reproducibility between cells. The methods in the present paper can be combined with the methods for electrode fabrication presented by Marks et al., 11 for a complete evaluation of Li-ion battery materials in full coin cells. Experimental Electrolyte solutions.-Electrolyte solutions contained 1 mol L −1 LiPF 6 (Capchem, Shenzhen, China ≥99.9%) in a 1:1 solvent blend, by mass, of ethylene carbonate (EC, Capchem, <20 ppm H 2 O) and diethyl carbonate (DEC, Capchem, <20 ppm H 2 O). 1%, by mass, of the electrolyte additive LiPO 2 F 2 (Capchem) was added to the solutions prior to cell construction/filling. 12-16 Coin cell preparation.-Full coin cells were made with LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622) as the positive material and graphite as the negative material. The two general construction designs are shown in Figure 1 and are based on established coin cell designs that offer good precision for Li metal half cells. Cell construction, spacer selection, etc. are described previously. 11,17 The electrodes used in the full coin cells were the same electrode materials as the machine-made pouch cells used in this work. The machine-made pouch cells were 240 mAh NMC622/graphite 402035-size cells obtained dry (no elec-trolyte) from LiFUN technologies (Zuzhou city, China). The pouch cells were vacuum sealed, without electrolyte, in a dry room in China and then shipped to Canada for our use. Electrode disks were punched from the one-sided coated region of electrodes extracted from pouch type cells with the punch diameter remaining constant (1.27 cm) for all electrodes to be used in the full coin cells. The NMC622 material was coated with Al 2 O 3 , which is commonly used to improve the positive electrode stability. 18-22 The positive electrodes had a mass loading of 21.3 mg/cm 2 and the coating was pressed to a density of 3.3 g/cm 2. The electrode formulation was 96% active material, 2% PVDF binder and 2% Super S carbon black conducting diluent by weight. Such an electrode formulation is similar to those promoted by Marks et al. 11 The graphite (AML-400 grade from Kaijin, China) negative electrodes had a loading of 13.2 mg/cm 2 and the coating was pressed to a density of 1.55 g/cm 2. The electrode formulation was 96% active material, 2% CMC/SBR binder and 2% Super S carbon black conducting diluent by weight. The electrodes were punched in air and then heated under vacuum in a glove box antechamber overnight at 110 • C before being transferred into the glove box. The coin cells were assembled in the glove box. Some of the cells were constructed with the help of a vacuum pen (Virtual Industries, V8901), as discussed in the main text of this article. In order to keep the ratio of the electrolyte solution to electrode surface area constant, the same volume of electrolyte was used for all of the coin cells in this work. Electrolyte was added dropwise from a syringe between each layer of the coin cell. One drop of electrolyte from the syringes used has a mass of 2.0 ± 0.1 mg. EC/DEC was chosen as the solvent because DEC-containing solvent blends evaporate more slowly than DMC-containing ones, which have favorable rheological properties but are relatively volatile.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use.

Filter

Showing 1–12 of 28 results

Added to wishlistRemoved from wishlist 2
Add to compare
  • Hard chrome plated on surface.Material HRC62.
  • Transparent protective plate is designed for safety operation.
  • Press gap is adjustable.
  • Rolling speed , press thickness is adjustable.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • This unique wet film applicator features adjustment for both of thickness and width.
  • The operator sets the blade clearance by adjusting the micrometers, and sets up film width to be coated by adjusting blade width.
  • This is an excellent tool to make quality film for material research laboratories to make ceramic tape casting, battery electrodes, and various coating at lower cost.
  • Stainless steel knife blade with precision ground edge.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
The product is a CE Certified electric crimper machine for the CR20XX series coin cells such as CR2016, CR2025, and CR2032. It is an ideal tool designed for operating both within and outside of a glove box.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Digital Pipetting Device Pipette Filler for Coin Cell Electrolyte Dispensing
  • Mechanical pipette is a multipurpose hand operated liquid handling device, used for accurately sampling and separating liquid. The design and operation is based on the principle of air replacement, and use one-time mouthpiece.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Adjustable Film Applicator - This unique wet film applicator features micrometer heads for knife blade adjustment.
  • The operator sets the blade clearance by adjusting the micrometers. This is excellent tool to make quality film for material research laboratories to make ceramic tape casting, battery electrodes, and various coating at lower cost. Stainless steel knife blade with precision ground edge.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Small size, light weight,No oil linkage, easy to carry.
  • High speed steel imported from Japan
  • Digital display pressure gauge0.1MPa,Pressure control is more accurate.
  • The oil pool is easy to replace oil on the main surface of the host, and the hydraulic oil filter is added to the oil path.
  • Special plunger, special custom sealed structure, good sealing effect, no oil leakage
  • The upper plate adopts six angle screws in electroplating sunk head. It is beautiful and saves space.
  • One one main plate structure, oil pool, main board, oil cylinder, on one body, no seal connection.
  • Lengthening spring, the rebound effect is good, not easy to deform, can realize the oil cylinder 30mm return no deformation.
  • The Aluminum Alloy handwheel, beautiful, practical, durable, not easy to damage
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Coating speed is at the range of 0~100mm, adjustable.
  • Vacuum aluminum plate, used to place and take off the substrate in quick.
  • Stroke can be regulated by travel switch at the range of 0~300mm.
  • Accuracy of adjustable coating machine is 0.01mm.
  • Small dimension saves space.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • 180 mm standard width.
  • Built in slurry guiding plate to make film coating at easy.
  • Make wet film thickness between 0 - 5000 microns.
  • Micrometer head's controllable accuracy is 10 microns.
  • Slurry Capacity: 72 ml.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Hydraulic press machine is a desktop manual pressing machine for materials / chemistry research laboratories to prepare compound ceramic sample.
  • The Hydraulic press machine is mainly used for laboratory tablet battery materials manual press, and Pressure powdery cake. It is mainly used for coin cell/ button battery electrode lab press.
  • The Manual press machine mould can be customized according to customer’s requirements.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
Call for Price
Added to wishlistRemoved from wishlist 1
Add to compare
  • Four side coating device is designed for use in the substrate flat top uniform coating of paint, adhesive and similar products.
  • Multi slot coating is the diversity of choice and the fixed groove evaporator precision combined in one instrument. Applicable to water, acid and alkaline products.
  • Material : Stainless steel abrasion resistant material
  • Effective coating width : 80mm, Total width : 100mm
  • The coating thickness for your choice: 1:(5um,10um,15um,20um); 2:(25um,50um,75um,100um) ;3:(50um,100um,150um,200um);4:(30um,60um,90um,120um) ;5:(100um, 200um,300um,400um) ;6:(50um, 75um,100um,125um);7:(100um, 150um,200um,250um);8:(250um, 500um,750um,1000um)
  • For lithium battery lab research, we usually use the No.3 with thickness 150um or 200um.
Call for Price
Added to wishlistRemoved from wishlist 0
Add to compare
  • Two blades with adjustable height from 0 - 6 mm
  • Width : 150 mm
  • Make wet film thickness between 0 - 6000 microns
  • Micrometer head's controllable accuracy is 10 microns
Call for Price
Register New Account
Reset Password
Compare items
  • Total (0)
Compare