1 second full of charge, pleated graphene, all kinds of battery black technology shining debut

The recently concluded 2018 China electric vehicle hundred people's meeting BBS has once again promoted new energy vehicles, power batteries and charging facilities to hot spots. Xu changming, deputy director of the state information center, said in his speech that to expand the market of new energy vehicles on a large scale, users' pain points must be addressed. According to the survey results of more than 1,000 new energy vehicle users carried out by the state information center, users' dissatisfaction is mainly focused on two aspects: one is not enough driving range; the other is long charging time and inconvenient charging. It can be seen that the bottleneck restricting the overall development of new energy vehicles still lies in battery technology, including the power storage that decides the driving distance and the quick charging technology that shortens the charging time.

At home and abroad have seen this, in the pursuit of new energy battery race, who took the lead in technology high point, can lead the new energy vehicles, including the multi-industry change. Some focus on the research and development of new batteries, some are committed to improving the rapid charging technology, constantly have been developed, so, small make up also take pains to check, what are the recent research results?

1. Professor liang kui's team: progress has been made in the field of lithium ion battery materials

On January 23, according to the news, professor liang kui's team of postgraduate student wen xiaofeng discovered that after treating and calcining the lithium-rich manganese anode material with aluminum nitrate solution in nine water, the layered structure of the material can be transformed into spinel structure, and the spinel structure can be covered with an aluminum oxide.

The spinel structure has a 3D lithium ion transport channel, which greatly improves the conduction rate of lithium ions and thus improves the material's multiplier performance. At the same time, alumina coating can isolate the direct contact between the active material and the electrolyte, avoid the damage of the electrolyte to the active material, and improve the recycling performance. This treatment method is simple in process and requires less equipment. It can improve the multiplier performance and cycle performance of the lithium-manganese anode material at the same time. After modification, the discharge capacity of lithium-manganese positive electrode material can reach up to 240mAh/g at the current density of 250mA/g, and still reach 190mAh/g at the large current capacity of 1250mA/g.

2 scientific research team of zhejiang university: graphene-aluminum battery charged for 1.1 seconds

On January 3, a new graphene-aluminum battery was announced by a team from the department of polymer science and engineering at zhejiang university. The battery, which has a positive graphene film and a negative aluminium metal, can be charged in just 1.1 seconds.

Not only that, the battery can also work in the environment of minus 40 degrees Celsius to 120 degrees Celsius, in the environment of minus 30 degrees Celsius, the new battery can achieve 1000 charge and discharge performance is not reduced, and in the environment of 100 degrees Celsius, it can achieve 45,000 stable cycle.

It retains 91% of its capacity after 250, 000 cycles. That means the battery will last 70 years with an average of 10 charges a day. Moreover, this new type of battery, even if you bend it 10,000 times, its capacity is completely maintained; And even if you expose the battery to fire, it won't catch fire or explode.

Harbin Institute of Technology (hit) : significant progress has been made in the study of lithium ion batteries

Recently, institute of Harbin institute of chemical industry and chemistry professor Chen gang, led by energy conversion materials team, first put forward to the introduction of the two dimensional nano fluid structure cobalt oxide anode materials to increase the ratio of material performance, through a simple sol gel prepared by anionic groups on the surface of modified nano film, the modified group prompted nano piece can assemble the support layer upon layer stack structure.

The spacing of the nanosheet layer is slightly less than twice the length of the lithium ion debye, which can provide a two-dimensional fluid channel for the transmission of lithium ions. The negative groups in the inner wall of the channel will selectively attract lithium ions, repel the negative ions, and accelerate the transmission of lithium ions. It is found by electrochemical test that the ionic conductivity of the fluid channel nano-sheet is several orders of magnitude higher than that of the bulk material, and the multiplier performance of the battery is greatly improved.

Northwestern university: folded graphene

On January 22, according to foreign media, researchers from northwestern university found that crumpled granular graphene can be used to enhance the charging performance of lithium batteries and overcome some defects of lithium batteries.

Microscopic lithium fibers accumulate on the surface of the electrode as the battery is charged, and branched crystals eventually cause a short circuit when they disperse, so the researchers used 3D nano-graphene materials to enhance performance and prevent the formation of branched crystals. The northwestern team found that folding nano-graphene dramatically increased the storage capacity of lithium batteries and prevented the formation of branched crystals. Greatly improve the charging performance of lithium battery.

U.S. department of energy: active polymer electrolyte binder

Lawrence Berkeley national laboratory, a us department of energy (doe) laboratory, has designed an active polymer electrolyte adhesive that can regulate the transport of key ions in a lithium-silicon battery and show how it works at the molecular level, foreign media reported on January 22. The polymer binder also doubles the electrical capacity, even when applied hundreds of times at high current densities.

Us scientist: lithium iron oxide rechargeable battery

Researchers at argonne national laboratory have teamed up with wolverton's team at northwestern university to develop a rechargeable lithium iron oxide battery, foreign media reported. Lithium ions move more than the usual lithium cobalt oxide batteries because of their larger capacity, which extends the battery life of electric cars.

The team at wolverton used two new strategies to improve the performance of ordinary lithium cobalt battery: replacing cobalt with iron and forcing oxygen to participate in chemical reactions. The team replaced cobalt with iron, the cheapest metal on the periodic table. Then, using calculations, they found the correct balance of lithium, iron and oxygen ions, so that both oxygen and iron ions could promote a reversible reaction without causing oxygen to escape.

What's more, the battery starts with four lithium ions instead of one, boosting its capacity. Iron and oxygen will drive the battery to react, allowing the four lithium ions to move back and forth between the anode and cathode of the battery.

Russian scientists: increase the capacity of lithium ion batteries and rapid charge and discharge

On January 3, according to foreign media reports, the Russian federation research center "EKeYuan krasnoyarsk in Siberia branch center for science in the" affiliate chilion, physics and Siberia federal university and national research scientists at the university of technology "alloy of iron and steel institute in Moscow," proposed that the use of graphene with single sulfide compounds of vanadium film as lithium ion battery anode material, will make the capacity of the battery and charging - discharging speed was improved.

The composite material developed by the Russian scientists is a two-dimensional structure consisting of two heterogeneous layers (graphene and vanadium disulfide), the thickness of which is about 1 nanometer. Studies have shown that not only can lithium ions be confined to the surface of the material, but they can also be confined to the space between layers, resulting in a high specific capacity of the material.

Guoxuan high-tech co., LTD. : new lithium battery energy density 302Wh/Kg

Recently, guoxuan high-tech said publicly that it has successfully developed a sanyuan 811 flexible battery cell with an energy density up to 302Wh/Kg, and it plans to start construction of a new product line in 2019.

Previously, guoxuan high-tech has undertaken a special project of 300Wh/Kg high energy density battery from the ministry of science and technology of China. At present, the project is progressing smoothly, and the new technology will be gradually commercialized in the future.

In addition to the national project, guoxuan high-tech also introduced its lithium iron phosphate battery and future development strategy planning. According to the introduction, guoxuan high-tech has used its own development of lithium iron phosphate anode material to produce 2131 high-energy density cylindrical lithium iron phosphate battery, with the energy density reaching 170Wh/Kg.

The page contains the contents of the machine translation.