Analyses of Capacity Loss and Improvement of Cycle Performance for a High-Voltage Hybrid Electrochemical Capacitor

A search map composed of the redox potentials of ∼1 000 000 organic compounds is theoretically generated for finding novel electrolytes. The quantitative relationship between the redox potentials and functional groups is suggested. The cycle performance of lithium ion batteries is improved by applying a screened anodic additive.

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Self-Substitution and the Temperature Effects on the Electrochemical Performance in the High Voltage Cathode System LiMn1.5+xNi0.5−xO4 (x = 0.1)

Journal of Electrochemical Energy Conversion and Storage ◽

10.1115/1.4036386 ◽

2017 ◽

Vol 14 (2) ◽

Author(s):

Yun Xu ◽

Mingyang Zhao ◽

Syed Khalid ◽

Hongmei Luo ◽

Kyle S. Brinkman

Keyword(s):

Electrochemical Performance ◽

High Voltage ◽

Cathode Materials ◽

Metal Ion ◽

Structural Changes ◽

Rate Capability ◽

Performance Testing ◽

Capacity Loss ◽

Stable Performance ◽

Li Ion

The high voltage cathode material, LiMn1.6Ni0.4O4, was prepared by a polymer-assisted method. The novelty of this work is the substitution of Ni with Mn, which already exists in the crystal structure instead of other isovalent metal ion dopants which would result in capacity loss. The electrochemical performance testing including stability and rate capability was evaluated. The temperature was found to impose a change on the valence and structure of the cathode materials. Specifically, manganese tends to be reduced at a high temperature of 800 °C and leads to structural changes. The manganese substituted LiMn1.5Ni0.5O4 (LMN) has proved to be a good candidate material for Li-ion battery cathodes displaying good rate capability and capacity retention. The cathode materials processed at 550 °C showed a stable performance with negligible capacity loss for 400 cycles.

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Stabilizing the high-voltage cycle performance of LiNi0.8Co0.1Mn0.1O2 cathode material by Mg doping

Journal of Power Sources ◽

10.1016/j.jpowsour.2019.227017 ◽

2019 ◽

Vol 438 ◽

pp. 227017 ◽

Cited By ~ 14

Author(s):

Xiaolan Liu ◽

Shuo Wang ◽

Li Wang ◽

Ke Wang ◽

Xiaozhong Wu ◽

...

Keyword(s):

Cathode Material ◽

High Voltage ◽

Cycle Performance ◽

Mg Doping

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High-Voltage, High-Frequency Electrochemical Capacitor

ECS Meeting Abstracts ◽

10.1149/ma2014-02/3/209 ◽

2014 ◽

Keyword(s):

High Voltage ◽

High Frequency ◽

Electrochemical Capacitor

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Electrochemical Properties of SnO2 Thin Films Doped with Bi and Si for Negative Electrode of Microbattery

MRS Proceedings ◽

10.1557/proc-671-o8.26 ◽

2001 ◽

Vol 672 ◽

Author(s):

Young-Il Kim ◽

Hee-Soo Moon ◽

Kwang-Sun Ji ◽

You-Kee Lee ◽

Jong-Wan Park

Keyword(s):

Negative Electrode ◽

Reversible Capacity ◽

Cycle Performance ◽

Mixed Conductor ◽

Capacity Retention ◽

Promising Alternative ◽

Capacity Loss ◽

Micro Cracks ◽

Formation Of Cracks ◽

Sno2 Thin Films

ABSTRACTTin oxide has been proposed as a promising alternative anode material for microbatteries. It has been reported that its theoretical volumetric capacity is four times larger than that of carbon-based materials, while its gravimetric capacity is twice as large. In this experiment, optimal Si and Bi doped SnO2 films were prepared with e-beam evaporation to improve both the cycle performance and the reversible capacity. The films with addition of Si only exhibited reductions in aggregation of tin particles and formation of micro-cracks. However, there still remained cracks, which induce capacity loss during cycling. To improve capacity retention, Bi was added with Si to SnO2 films, which exhibited the highest reversible capacity of 200µAh/cm2-µm at 200th cycle. The films doped with Bi and Si were found to be ill-defined and featureless without noticeable particle aggregation and cracks. However, the films that underwent cycling tests showed again aggregated tin particles and formation of cracks, which would induce cell failure during cycling. We believe that some types of Li-Bi phases as mixed-conductor matrices have improved the cycle life.

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