There is a tradition among mainstream press outlets of taking battery-related research, misreading it in a way that makes it sound more impressive than it really is, and publishing breathless articles about how revolutionary it is. This article continues the tradition.
The Electrek article claims that the researchers made a cell with "an impressive energy density of 460 Wh/Kg". But the Nature paper says that they made a cell with "460 watt-hours per kilogram of total composite electrode". These are not the same; a cell contains other components besides the electrode: the anode, the electrolyte, and the package. The paper doesn't state the overall energy density (at least in the abstract), but it will surely be much lower when other components are counted.
The Electrek article claims that the researchers made a cell with "an impressive energy density of 460 Wh/Kg". But the Nature paper says that they made a cell with "460 watt-hours per kilogram of total composite electrode". These are not the same; a cell contains other components besides the electrode: the anode, the electrolyte, and the package. The paper doesn't state the overall energy density (at least in the abstract), but it will surely be much lower when other components are counted.