Lithium metal is considered to be the "holy grail" material for the construction of high specific energy battery electrodes because of its ultra-high theoretical specific capacity and lowest electrode potential. Compared with existing commercial lithium-ion batteries, lithium metal batteries (LMBs) based on metallic lithium as the negative electrode have greatly improved the theoretical energy density of the battery, demonstrating the great potential to meet the needs of emerging industries for high energy density.
Recently, Zhang Qiang, a professor at Tsinghua University, Yuan Tongqi, a professor at Beijing Forestry University, Huang Jiaqi, a researcher at Beijing Institute of Technology, and Maria Magdalena Titiric, a professor at Imperial College London, published a review article in Materials Today Nano Based on the understanding of anode chemistry, the latest research results of lithium metal anode protection strategies based on biomass nanomaterials are introduced, and the future development direction is prospected.
The researchers said that the problems of uncontrolled lithium dendrite growth and unstable SEI film on the metal lithium anode limit the commercialization process of lithium metal batteries. Natural biomaterials have the advantages of low cost, environmental friendliness, and rich structure, and their derived nanomaterials can inherit the excellent characteristics of natural materials, and have great application potential in stabilizing interface SEI and regulating the growth of negative electrode lithium dendrites. .
The article points out that the artificial protective layer of natural biomass polymer film has higher mechanical strength and rich physicochemical characteristics such as functional groups, and has advantages in constructing an artificial protective layer. On the one hand, the growth of dendrites can be suppressed by the high mechanical modulus of natural polymers; on the other hand, the rich polar functional groups in the polymer backbone can also be used to regulate the uniform deposition of lithium ions.
Diaphragm biomacromolecules have a rich pore structure and polar surface functional groups. They are widely used to modify traditional diaphragms or design new biomass-based diaphragms to improve the wettability and ion flux of the diaphragm and achieve lithium ion Efficient electrochemical deposition.
The polymer electrolyte natural biopolymer has rich chemical groups, high mechanical elasticity and chemical stability, and can be cross-linked through physical chemistry or used as a polymer electrolyte carrier to improve the mechanical properties and ionic conductivity of the polymer electrolyte To obtain a highly efficient and stable lithium negative electrode interface.
Nanocarbon materials derived from functional skeleton natural biological materials have the advantages of rich porous structure, high electrical conductivity and diversified structure, and have important application prospects in the construction of functional skeletons or lithium metal anode hosts.
This review builds a bridge between sustainable natural biomass materials and lithium metal anode protection to promote the application of biomass nanomaterials in high energy density LMBs and other advanced energy storage systems.
It is understood that the team of Zhang Qiang has carried out many leading research work in the field of energy material chemistry, especially metal lithium anodes, lithium-sulfur batteries and electrocatalysis. In the field of metal lithium anodes, the team used in-situ methods to study the solid-liquid interface film, and adjusted the deposition behavior of metal lithium through nano-skeleton, artificial SEI, surface solid electrolyte protection film, etc., inhibited the growth of lithium dendrites, and realized metal lithium Efficient and safe use. Related research work has been published in many journals such as "German Applied Chemistry", "Journal of the American Chemical Society", "Advanced Functional Materials" and "Proceedings of the American Academy of Sciences". (Reporter Li Huiyu)
PE Plastic Rod, full name is Polyethylene Rod.
Physical properties: PE plastic Rod is the most simple structure of the macromolecular organic compounds, the world's most widely used polymer materials, composed of ethylene polymerization, depending on the density is divided into high density polyethylene Rod, medium density polyethylene and low density polyethylene.
(1) LDPE Rod
Low density polyethylene Rod (also known as high pressure polyethylene Rod)
(2) LLDPE Rod
Linear low density polyethylene
(3) MDPE Rod
Medium density polyethylene
(4) HDPE Rod
High density polyethylene (also known as low pressure polyethylene)
(5) UHMWPE Rod
Ultra high molecular weight polyethylene(6)Modified polyethylene Rod
Chlorinated polyethylene (CPE) and crosslinked polyethylene (PEX)
(7)Ethylene - ethylene copolymer
Ethylene/propylene copolymer (plastic), EVA, ethylene, ethylene butene copolymer - other olefins, such as octene POE, cyclic olefin copolymer, ethylene/unsaturated ester copolymer (EAA, EMAA, EEA, EMA, EMMA, EMAH).
Polyethylene, which has a molecular weight of 3 million to 6 million, is known as UHMWPE.
Ultra high molecular weight polyethylene Rod is very strong and can be used for body armor.
1. Papermaking industry: suction box board, scraper, molding plate, bearing, gear;
2. Mining industry: charging barrel, abrasive and adhesive-resistant back lining for warehouses;
3. Chemical industry: acid pump, filter plate, worm gear, bearing;
4. Food industry: packing machinery parts, bottle guide, screw, wear plate, slide way, stud weld, roller and other transmission parts;
5. Textile industry:buffer board;
6. Food processing industry: chopping block, refrigerating plant;
7. Wharf: anti-collision board.
1. Acid and alkali resistance, resistance to organic solvents
2. Excellent electrical insulation and static resistance
3, Can still maintain a certain touness even at low temperature
4. Extremely high impact strength
5. Low friction coefficient
6. Non-toxic
7. Low water absorption
8.Lower density than any other thermoplastic plastics (<1g/cm3)
Disadvantages:
PE Plastic Rod have Weak mechanical property, air permeability, easy deformation, easy ageing, brittle, brittle less than PP, easy stress cracking, surface hardness, easy to scratch.
Difficult to print, in printing, surface discharge treatment, cannot electroplating, the surface has no luster.
Specification: the diameter of the PE rod can be produced from 2mm to 250mm. The conventional length is 1000mm, and the length is unlimited.
The thickness of PE Rod material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width cannot exceed 1200mm, the length is not limited.
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 1000mm* 2000mm, and the commonly used specification of10-180mm is 600*1200mm.PE Rod can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited
Color: natural color is wax white, also can be customized black and color, the order of the color to order is 500KG.
Add antistatic agent to the permanent antistatic electric bar, and the volume resistance value is between 6 to 9 power of 10.Add flame retardant to the flame retardant rod from UL 94V-0 to HB flame retardant grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.
Combustion characteristics:
Combustion situation: easyCombustion flame status: molten drop, yellow lower blue
After the fire: continue to bur
Smell: the smell of wax burning
Product certification: most environmental certification reports and safety reports for raw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
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Dongguan Noegem Plastic Products Co.,Ltd , https://www.noegempLastic.com