Jun Ma

ORCID: 0000-0002-2425-9784
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About
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Research Areas
  • Advancements in Battery Materials
  • Advanced Battery Materials and Technologies
  • Advanced Battery Technologies Research
  • Extraction and Separation Processes
  • Supercapacitor Materials and Fabrication
  • Electric Vehicles and Infrastructure
  • Semiconductor materials and devices
  • Dielectric materials and actuators
  • Vibration Control and Rheological Fluids
  • Electric and Hybrid Vehicle Technologies
  • Inorganic Chemistry and Materials
  • Structural Analysis and Optimization
  • Recycling and Waste Management Techniques
  • Transport and Economic Policies
  • Fiber-reinforced polymer composites
  • Manufacturing Process and Optimization
  • Advanced Sensor and Energy Harvesting Materials
  • Synthesis and properties of polymers
  • Advanced battery technologies research
  • Aeroelasticity and Vibration Control
  • Robotic Mechanisms and Dynamics
  • Modular Robots and Swarm Intelligence
  • Energy, Environment, and Transportation Policies
  • Shape Memory Alloy Transformations
  • Transportation and Mobility Innovations

Tsinghua University
2010-2024

Tsinghua–Berkeley Shenzhen Institute
2022-2024

Tongji University
2011-2021

Pennsylvania State University
2015-2021

Jiading District Central Hospital
2014

Huazhong University of Science and Technology
2013

University Town of Shenzhen
2013

Nano and Advanced Materials Institute
2010-2011

Central South University
2010

Fudan University
2005-2006

The recycling of spent lithium-ion batteries is an effective approach to alleviating environmental concerns and promoting resource conservation. LiFePO4 have been widely used in electric vehicles energy storage stations. Currently, lithium loss, resulting formation Fe(III) phase, mainly responsible for the capacity fade cathode. Another factor poor electrical conductivity that limits its rate capability. Here, we report use a multifunctional organic salt (3,4-dihydroxybenzonitrile dilithium)...

10.1038/s41467-023-36197-6 article EN cc-by Nature Communications 2023-02-03

A large amount of spent LiFePO4 (LFP) has been produced in recent years because it is one the most widely used cathode materials for electric vehicles. The traditional hydrometallurgical and pyrometallurgical recycling methods are doubted economic environmental benefits; direct regeneration method considered a promising way to recycle LFP. However, performance regenerated LFP by not ideal due migration Fe ions during cycling irreversible phase transition caused sluggish Li+ diffusion. key...

10.1002/adma.202208034 article EN Advanced Materials 2022-10-27

Abstract Lithium cobalt oxide (LCO) is widely used in Li‐ion batteries due to its high volumetric energy density, which generally charged 4.3 V. Lifting the cut‐off voltage of LCO from V 4.7 will increase specific capacity 150 230 mAh g ‐1 with a significant improvement 53%. However, suffers serious problems H1‐3/O1 phase transformation, unstable interface between cathode and electrolyte, irreversible oxygen redox reaction at Herein, stabilization band structure modification are proposed...

10.1002/adma.202212059 article EN Advanced Materials 2023-02-27

The direct recycling of cathode materials in lithium-ion batteries is important for environmental protection and resource conservation. key regeneration processes are composition replenishment atom rearrangement, both which depend on the migration diffusion atoms. However, degraded LiNi

10.1002/adma.202313144 article EN Advanced Materials 2024-03-05

LiCoO2 has suffered from poor stability under high voltage as a result of insufficient Co-O bonding that causes lattice oxygen release and distortions. Herein, we fabricated high-voltage at 4.6 V by doping with Ni/Mn atoms, which are obtained spent LiNi0.5Mn0.3Co0.2O2 cathode materials. The as-prepared substitutional dopants in the Co layer enhances suppresses harmful phase transformation during delithiation, thus stabilizing layered structure leading to superior electrochemical performance...

10.1021/acs.nanolett.2c03090 article EN Nano Letters 2022-09-23

An innovative concept for a multifunctional structural battery using lithium-ion materials as load bearing elements in sandwich panel construction has been demonstrated. The prototype exhibited an initial capacity of 17.85 Ah, energy density 248 Wh L −1 , specific 102 kg and retention 85.8% after 190 charge–discharge cycles at ~ C/3 rate eight mechanical loading (upto 1060 N). stiffness three-point bend tests follows expectations based on beam theory, proving that the are sharing...

10.1177/1045389x16679021 article EN Journal of Intelligent Material Systems and Structures 2016-12-01

To extend the electrochemical reaction mechanisms of transition-metal compounds based on metal cobalt as anode with Li, Li was first investigated. A lithium phosphorous oxynitride (Lipon) thin film coating surface fabricated a separator between and liquid electrolyte to avoid solution Interestingly, behavior cell reversible. The as-deposited, lithiated, delithiated electrode characterized by ex situ scanning electron microscopy, X-ray diffraction, photoelectron spectroscopy measurements. It...

10.1149/1.1839512 article EN Journal of The Electrochemical Society 2005-01-01

The phase compositions of the -based cathode materials upon varying adding amount vanadium from 0 to 0. 13 are systemically investigated. A corresponding concentration–composition diagram is presented, and -dependent variations in physiochemical electrochemical performances analyzed. In whole concentration range, chemical valence remains invariant whereas evolves . With increase vanadium, electrical conductivity samples varies nonlinearly as an "N" shape while lithium ion diffusion...

10.1149/1.3514688 article EN Journal of The Electrochemical Society 2010-11-22

The principles of sandwich construction were used to design, manufacture, and analyze multifunctional beams that can withstand structural load also store electrochemical energy. Three manufactured with aluminum face skins adhesively bonded cores consisting unidirectional layers lithium-ion battery anode cathode materials stacked across the width beam so their edges be skins. This novel arrangement enables them contribute significantly through-thickness shear rigidity beam. All three tested...

10.1177/1099636215591908 article EN Journal of Sandwich Structures & Materials 2015-06-24

The low cost, simplicity, and easy use of battery-powered multirotor aircraft has led to their adoption in commercial, industrial, agricultural, military applications. These aircraft, however, have limited payloads shorter endurance range than fuel-powered conventional aircraft. To extend these key performance metrics, a structural battery is developed that uses commercially available cells as load bearing power source elements for weight critical cylindrical tested three-point bending found...

10.1002/er.4937 article EN International Journal of Energy Research 2019-10-30

This paper used Advisor to define structures and power trains of parallel plug-in hybrid electric vehicles (PHEVs), made two PHEV models that have different battery ranges 20 km 60 km, established consumer total ownership cost based on purchase, compared with a conventional vehicle (CV) vehicles. Then three scenarios were defined – government subsidy (US$2571 for PHEV20 US$7143 PHEV60 according Chinese policy, where in this 1 US$ = 7.00 RMB), high oil price (10 per cent annual growth rate),...

10.1177/0954407011421859 article EN Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering 2011-10-21

ABSTRACT Adhesives that are stable in Li‐ion battery electrolytes required to realize the potential of new designs integrate structural elements with energy storage. Here, several polymers, commercial adhesives, and sealants were investigated bond seal a sandwich panel. Gravimetric electrolyte uptake measurements compared Hansen solubility parameters predict long‐term durability materials exposed electrolyte. The adhesively bonded joints an epoxy adhesive, which was selected as lowest...

10.1002/app.46059 article EN Journal of Applied Polymer Science 2017-12-15

Abstract With the increasing number of new energy vehicles (NEV), NEV industry is facing a situation large amounts retired power battery. In this study, first, relevant research battery recycling mode sort out. And paper proposes four-level network, which includes nodes such as collection warehouse, storage transfer hub, echelon utilization enterprise, etc.Then, Mixed-Integer Non-Linear Programming model proposed to minimize cost network.

10.1088/1755-1315/651/2/022074 article EN IOP Conference Series Earth and Environmental Science 2021-02-01
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