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Technology Stocks : The Electric Car, or MPG "what me worry?"

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From: Eric12/27/2017 1:52:29 PM
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Samsung’s “Balls” Battery Charges At 5C, Retains 78.6% Capacity After 500 Cycles

2 hours ago

by Mark Kane

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Samsung SDI Battery Factory In Hungary

The specs look promising, but we’ll have to wait to find out if it works as described in the real world. The Samsung Advanced Institute of Technology (SAIT) has presented promising test results of a new a graphene–silica assembly, called a graphene ball that improves battery performance.


Samsung Advanced Institute of Technology (SAIT) – results of “graphene balls” cell tests

The new concept apparently increases the energy density of the cells to over 400 Wh/kg, as well as cycle life and fast charging capability.

SAIT reports a 78.6% capacity retention after 500 ultra-fast cycles at 5C current (12-minute charging) at a high temperature of 60°C. The capacity should of course fade slower when charging at lower speeds.

While we are of course concerned about another breakthrough in battery technology that exists only in the lab, this time it’s released by researchets that are connected to giant battery manufacturer Samsung SDI.

Future EVs equipped with these batteries potentially would be both long-range, and have the ability to quick charge in just minutes.
“Improving one property without sacrificing others is challenging for lithium-ion batteries due to the trade-off nature among key parameters. Here we report a chemical vapor deposition process to grow a graphene–silica assembly, called a graphene ball. Its hierarchical three-dimensional structure with the silicon oxide nanoparticle center allows even 1?wt% graphene ball to be uniformly coated onto a nickel-rich layered cathode via scalable Nobilta milling. The graphene-ball coating improves cycle life and fast charging capability by suppressing detrimental side reactions and providing efficient conductive pathways. The graphene ball itself also serves as an anode material with a high specific capacity of 716.2mAhg-1. A full-cell incorporating graphene balls increases the volumetric energy density by 27.6% compared to a control cell without graphene balls, showing the possibility of achieving 800WhL-1 in a commercial cell setting, along with a high cyclability of 78.6% capacity retention after 500 cycles at 5C and 60?°C.
Source: “Graphene balls for lithium rechargeable batteries with fast charging and high volumetric energy densities,” Nature Communications

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