| 1. |
|
|
| 2. |
- Sun, Bing, et al.
(författare)
-
Solid polymer electrolyte coating from a bifunctional monomer for three-dimensional microbattery applications
- 2013
-
Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 238, s. 435-441
-
Tidskriftsartikel (refereegranskat)abstract
- This work comprises the synthesis and characterization of a novel solid polymer electrolyte based on oligomeric polyetheramine substituted with a methacrylic group at one of its three chain ends. This modification introduces a bifunctionality to the PEA monomer it can act both as polymerizable unit and surfactant. Thin and pinhole-free polymer electrolyte layers could be constructed with thicknesses in the order of <1 mu m using UV-initiated polymerization. The electrolyte exhibits good electrochemical and chemical stability up to 4 V vs. Li+/Li. LiFePO4 cathode coated with the electrolyte was cycled against lithium at 60 degrees C, and displayed reasonable capacity values (similar to 140 mAh g(-1)) for 10 cycles, where after Li dendrite formation contributed to battery instabilities.
|
|
| 3. |
- Tan, Semra, et al.
(författare)
-
3-D microbattery electrolyte by self-assembly of oligomers
- 2011
-
Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738 .- 1872-7689. ; 198:1, s. 26-31
-
Tidskriftsartikel (refereegranskat)abstract
- This paper reports the preparation and characterization of novel thin film electrolytes by UV cross-linking of poly(propylene glycol) diacrylate in the presence of polyetheramine (glyceryl poly(oxypropylene)triamine) and LiTESI. The oligomeric surfactant polyetheramine facilitates self-assembly of the electrolyte, enabling it to be applied conformally onto a complex substrate which is necessary for 3D-microbatteries, while the acrylate network supplies mechanical stability. Conformal coatings onto LiFePO(4) electrodes and Cu nanopillars were confirmed by SEM. Ionic conductivities of 3.5 x 10(-6) and 5.8 x 10(-5) S/cm were measured at room temperature and 60 degrees C, respectively, at Li:O = 1:20 and PEA:PPGDA = 2:1 ratios. The electrochemical stability window test showed that the electrolyte is stable above 5.0 V vs. Li/Li(+). Thermal analyses by TGA and DSC demonstrated that the polymer electrolyte is amorphous and thermally stable up to 300 degrees C.
|
|
| 4. |
- Tan, Semra, et al.
(författare)
-
A solid state 3-D microbattery based on Cu 2Sb nanopillar anodes
- 2012
-
Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738 .- 1872-7689. ; 225, s. 510-512
-
Tidskriftsartikel (refereegranskat)abstract
- A 3D-microbattery consisting of nanostructured Cu 2Sb, a solid state electrolyte and a metallic lithium foil has been investigated electrochemically. Thin-film Cu 2Sb electrodes have been prepared by heat treatment of electrodeposited Sb on both 2D and 3D-nanopillar Cu substrates. A solid electrolyte based on UV cross-linked blends of poly(propylene glycol) diacrylate and polyetheramine (glyceryl poly(oxypropylene)) was thereafter deposited onto the electrode material, and then cycled against Li. It is demonstrated that the discharge capacity per footprint area for the 3D-nanopillar samples increased more than 10 times as compared to that of the 2D system.
|
|
| 5. |
- Tan, Semra, et al.
(författare)
-
Activation behavior of an AB(2) type metal hydride alloy for NiMH batteries
- 2016
-
Ingår i: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 41:23, s. 9948-9953
-
Tidskriftsartikel (refereegranskat)abstract
- Activation behavior of an AB(2), namely (Ti0.36Zr0.64) (V0.15Ni0.58Mn0.20Cr0.07)(2) Laves phase alloy, was investigated with regards to; particle size, ball milling and hot alkaline treatments. Galvanostatic cycling in open cells showed that an untreated alloy initially had almost no capacity, but reached a value of 220 mAh/g after 14 cycles. Experiments with different particle sizes showed that coarse particles activate faster yielding an improved capacity. In terms of activation more pronounced effect was obtained with boiling the alloy powder in a hot KOH solution. A capacity in excess of 300 mAh/g is reached in the first cycle after a 20 min treatment. The capacity was highest after 80 min, yielding a value of 390 mAh/g well above that expected from the gas-phase storage in the alloy. This was attributed to the formation of rough surface in the powder, which may stabilize hydrogen bubbles allowing pressures above 1 atm to be reached locally in the surface.
|
|
| 6. |
- Tan, Semra, et al.
(författare)
-
Poly(ether amine) and cross-linked poly(propylene oxide) diacrylate thin-film polymer electrolyte for 3D-microbatteries
- 2010
-
Ingår i: Electrochemistry communications. - : Elsevier BV. - 1388-2481 .- 1873-1902. ; 12:11, s. 1498-1500
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents a novel thin-film electrolyte of a 2:1 blend of polyetheramine (glyceryl poly(oxypropylene)) and cross-linked oligomeric poly(propylene oxide) diacrylate with LiTFSI. The polyetheramine acts as a surfactant, and can thereby be applied as a conformal coating on complex surfaces-here demonstrated for porous LiFePO4 cathodes-making it useful for 3D-microbatteries. The poly(propylene oxide) diacrylate blends with the surfactant and is easily UV cross-linked, thereby ensuring good mechanical stability. Electrolytes, ∼ 2 μm thick, were casted onto LiFePO 4 cathodes and cycled against metallic lithium, displaying stable discharge capacities of ∼ 8 mAh/g at room temperature and ∼ 120 mAh/g at 60 °C. The electrolyte showed conductivities of 3.45 × 10 - 6 and 5.80 × 10- 5 S cm- 1 at room temperature and 60 °C, respectively.
|
|
