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Current Issue
2020 Vol.37 Issue.1,
Published 2020-01-15
0
2020 Vol. 37 (1): 0-0 [
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1
2020 Vol. 37 (1): 1-1 [
Abstract
] (
1938
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2
Research Progress of Solid Polymer Electrolytes for Lithium-Ion Batteries
Chen Likun, Hu Yi, Ma Jiabin, Huang Yanfei, Yu Jing, He Yanbing, Kang Feiyu
Polymer electrolytes are widely considered as promising candidates for all-solid-state lithium-ion batteries with high safety and energy density. They have several specific advantages such as high safety, good film reforming properties, viscoelasticity, excellent contact and compatibility with electrodes. However, polymer electrolytes cannot meet the requirements of solid polymer batteries operating because of its insufficient ionic conductivity(10
-8
~10
-6
S·cm
-1
) at room temperature. Therefore, it is important to improve the ionic conductivity, mechanical strength, electrochemical stability and other intrinsic properties. Meanwhile, the key factor for developing solid polymer lithium ion battery is to explore the improvement of electrolyte/electrode interface and ion transport pathway inside the electrode. In this paper, we review the ion transport mechanism and the key parameters for gel polymer electrolytes, all-solid-state polymer electrolytes and composite solid electrolytes. We also summarize the recent advances and future development direction of polymer electrolytes.
2020 Vol. 37 (1): 2-16 [
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3266
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Research Progress of Electrode Material for Supercapacitor
Li Yanmei, Hao Guodong, Cui Ping, Yi Tingfeng
The depletion of fossil fuels, environmental pollution and the discontinuity and instability of clean energy output are the main problems in the current social electricity development demand. In various electrochemical energy storage technologies, supercapacitors have been widely studied because of their fast charge/discharge rate, long service life and high power density. Among the many factors that affect supercapacitors, electrode materials play a decisive role in overall performance. This paper summarizes the energy storage mechanism of various electrode materials for supercapacitors, such as carbon-based material, metal oxide, metal hydroxide and metal sulfide, as well as the research progress of their electrode materials. Finally, the paper looks into the distance of the challenges and future development direction of electrode material research.
2020 Vol. 37 (1): 17-33 [
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4181
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34
Voltage Decay of Lithium-Rich Manganese-Based Materials and its Modification Strategy
Liu Yanchen, Chen Yafen, Wang Jing, Wu Junwei, He Yanbing
Lithium rich manganese-based cathode material (LMR)
x
Li
2
MnO
3
·(1-
x
)LiMO
2
is considered to be the most promising cathode material for lithium-ion batteries in the future due to its high specific capacity and low cost. However, LMR cathodes faced with severe voltage fade problems which shortening the cycle life of LMR cathodes and limiting the industrialization process of LMR cathodes. The paper expounded the voltage fade of LMR cathodes, summarized the influence of voltage attenuation on crystal structure, introduced the factors affecting the voltage decay of LMR cathodes, gave the solution to alleviate the voltage decay of LMR materials, and outlooked the application and developing direction of LMR cathodes.
2020 Vol. 37 (1): 34-44 [
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Recent Progress and Perspective in Carbon-Based Anode Materials for Potassium-Ion Batteries
Tian Xiaodong, Wang Tengfei, Song Yan, Liu Zhanjun
The ever-growing demand for large-scale energy storage systems requires novel battery systems with low-cost and sustainable properties. Owing to earth-abundance and cost effectiveness, the development of potassium-ion batteries (PIBs) has attracted intensive attention recently. This review not only summarizes the current research on carbon-based materials and their electrochemical performance, but also attempts to provide an overall possible potassium storage mechanism. Finally, the challenges and perspectives are discussed to demonstrate the development direction of PIBs.
2020 Vol. 37 (1): 45-57 [
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3328
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8408KB] (
1308
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58
Construction and Energy Storage Properties of WS
2
Nanostructures
Bai Ling, Fang Yanwu, Gu Xiaotian, Cai Yuqing, Zhang Chenyu, Zhang Encong, Yu Xuezhi, Gao Chenchen, Zhang Meng, Huang Zhendong
In response to the market's huge demand for high-performance lithium storage and sodium storage anode materials, and in order to solve the key limitations of metal sulfides, a series of tungsten sulfides with different morphology and nanostructures such as nanorods, nanoblocks and microspheres are designed and successfully developed. The experimental results indicate that WS
2
nanorods show a better energy storage performance than WS
2
nanoblocks and microspheres, due to the larger specific surface area, short diffusion distance and better crystallinity. Furthermore, a layer of graphene is coated on the surface of WS
2
nanorods as a modification layer by freeze-drying method. As a results, the structural stability and rate capability of the as-prepared graphene@WS
2
nanorods composites are effectively improved. Therefore, sodium-ion storage capacity of as-prepared graphene@WS
2
nanorods composites is still maintained at 65.9 mAh·g
-1
after being cycled at 500 mA·g
-1
for 500 cycles. And the corresponding lithium-ion storage capacity can be maintained at 288.3 mAh·g
-1
after being cycled at 1 000 mA·g
-1
for 500 cycles.
2020 Vol. 37 (1): 58-68 [
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69
Research on Preparation and Electrocatalytic Performance of Nitrogen-Doped Graphene Supported Pt-Sn Composite Catalyst
Li Huijun, Wu Hongyu, Wang Xiaomin
Nitrogen-Doped graphene suppported platinum shows a better performance in direct ethanol fuel cells (DEFCs). The high cost of Pt have seriously limited the commercialization of DEFCs. Herein, Pt-Sn supported on nitrogen-doped graphene(Pt-Sn/G-N) is synthesized via a very simple method in which graphene oxide is reduced with a series of different concentration of hydrazine hydrate. The uniform dispersion of the catalyst nanoparticles and the electrocatalytic activity of the Pt-Sn/G-N catalysts towards ethanol oxidation is examined. By controlling the different nitrogen content, the ratio of the best synergistic effect between Pt and Sn metal particles is further studied. The results indicate that both Pt and Sn loading of the catalyst reached the maximum, the ratio of Pt to Sn is 1.41 and the average particle size of Pt/Sn alloy is the smallest (1.8 nm) when the mass ratio of graphene oxide and hydrazine hydrate is 1:7. Moreover, compared with other catalysts, the Pt-Sn/G-N(1:7) exhibites the highest electrocatalytic ORR activity, long-standing stability and good tolerance against CO poisoning. That is to say, Pt and Sn of the Pt-Sn/G-N(1:7) achieve its catalytic synergistic effect, which may provide more gates for a Pt-Sn catalyst for application in direct ethanol fuel cells (DEFCs).
2020 Vol. 37 (1): 69-76 [
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Recent Progress of Application of Graphene-Based Freestanding Interlayer Material in Lithium-Sulfur Battery
Wei Huijie, Liu Yong, Wang Fei, Zhai Xiaoliang, Ren Fengzhang
In recent years, as one of the most promising sustainable energy storage devices, high-energy-density lithium-sulfur batteries have attracted widespread attention. However, the shuttle effect caused by the dissolution of intermediate products polysulfides during cycling can significantly influence the cycling performance and sulfur utilization rate of lithium-sulfur batteries, which seriously hinders their practical application and commercialization. Herein, this review summarizes the state-of-the-art of application of graphene and graphene-based self-supporting interlayer composite materials in recent years in lithium-sulfur batteries. For instance, physical or chemical confinement methods could be used to retard the shuttle effect of polysulfides and improve the electrochemical performance of lithium-sulfur batteries. The development direction and prospect of practical application of graphene-based self-supporting interlayer composite materials in lithium-sulfur batteries are also predicted and forecasted.
2020 Vol. 37 (1): 77-87 [
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5191
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88
Review of Three-Dimensional Metallic Lithium Anode
Zou Pinjuan, Xiong Xunhui
Metallic Li with the high theoretical specific capacity (3 860 mAh·g
-1
), low electrode potential (-3.04 V versus the standard hydrogen electrode) and low density (0.53 g·cm
-3
) is regarded as the most promising anode material for Li secondary batteries. However, there are still some problems such as dendrite growth, low Coulombic efficiency and short cycle life during the cycles. The three-dimensional metallic lithium anodes can effectively alleviate the above problems due to its high specific surface area and internal cavity. The progress in nanotechnology provides appropriate 3D metallic lithium anodes characterized by highly efficient morphologies and architectures. Herein, the design and research progress of three-dimensional metallic lithium anodes is described in detail, including metal-based and carbon-based 3D metallic lithium anodes.
2020 Vol. 37 (1): 88-95 [
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